An Approach for Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis, 29391-29393 [2012-11958]

Download as PDF Federal Register / Vol. 77, No. 96 / Thursday, May 17, 2012 / Notices Instrument to exempt MCA-Zambia from payment of the medical levy. [FR Doc. 2012–11993 Filed 5–16–12; 8:45 am] 1325 G Street NW., Suite 800, Boardroom, Washington, DC 20005. STATUS: Open. BILLING CODE 9211–03–P CONTACT PERSON FOR MORE INFORMATION: PLACE: NATIONAL ARCHIVES AND RECORDS ADMINISTRATION Advisory Committee on the Presidential Library-Foundation Partnerships National Archives and Records Administration. ACTION: Notice of meeting. AGENCY: In accordance with the Federal Advisory Committee Act, as amended (5 U.S.C. appendix 2), the National Archives and Records Administration (NARA) announces a meeting of the Advisory Committee on Presidential Library-Foundation Partnerships. The meeting will be held to discuss the National Archives and Records Administration’s budget and its strategic planning process as it relates to Presidential Libraries. The meeting will be open to the public. DATES: The meeting will be held on Friday, June 1, 2012 from 9:00 a.m. to 12:00 noon. ADDRESSES: National Archives building at 700 Pennsylvania Avenue NW., Washington, DC, Room 105. FOR FURTHER INFORMATION CONTACT: Denise LeBeck at 301–837–3250 or denise.lebeck@nara.gov. SUMMARY: Meeting attendees may enter from the Pennsylvania Avenue entrance. Due to space limitations and access procedures, the name and telephone number of individuals planning to attend must be submitted to the contact email listed. Photo identification will be required. No visitor parking is available at the Archives building; however there are commercial parking lots and metered curb parking nearby. SUPPLEMENTARY INFORMATION: Dated: May 14, 2012. Mary Ann Hadyka, Committee Management Officer. [FR Doc. 2012–11978 Filed 5–16–12; 8:45 am] mstockstill on DSK6TPTVN1PROD with NOTICES BILLING CODE 7515–01–P NEIGHBORHOOD REINVESTMENT CORPORATION Sunshine Act Meeting; Corporate Administration Committee, Board of Directors TIME AND DATE: 2:00 p.m., Thursday, May 24, 2012. VerDate Mar<15>2010 17:20 May 16, 2012 Jkt 226001 Erica Hall, Assistant Corporate Secretary, (202) 220–2376; ehall@nw.org. AGENDA: I. Call to Order II. Executive Session III. Employee Performance Management System Consult IV. Policy Changes V. Human Resources Updates VI. Washington, DC Office Lease Update VII. Annual Report Board Memberships—Officers and Board Appointees VIII. Board Elections and Appointments IX. Adjournment Erica Hall, Assistant Corporate Secretary. [FR Doc. 2012–12046 Filed 5–15–12; 11:15 am] BILLING CODE 7570–02–P NUCLEAR REGULATORY COMMISSION [NRC–2012–0110] An Approach for Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis Nuclear Regulatory Commission. ACTION: Draft regulatory guide; request for comment. AGENCY: The U.S. Nuclear Regulatory Commission (NRC or the Commission) is issuing for public comment four (4) draft regulatory guides (DGs), DG–1285, ‘‘An Approach for Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis,’’ (proposed Revision 3 of Regulatory Guide [RG] 1.174); DG– 1286, ‘‘An Approach for Plant-Specific, Risk-Informed Decisionmaking: Inservice Testing,’’ (proposed Revision 1 of RG 1.175); DG 1287, ‘‘An Approach for Plant-Specific, Risk-Informed Decisionmaking: Technical Specifications’’ (proposed Revision 2 of RG 1.177); and DG–1288, ‘‘An Approach for Plant-Specific Risk-Informed Decisionmaking for Inservice Inspection of Piping’’ (proposed Revision 2 of RG 1.178). These guides describe methods the NRC staff considers acceptable for plant-specific, risk-informed decisionmaking on specific licensee activities. SUMMARY: Submit comments by June 29, 2012. Comments received after this date DATES: PO 00000 Frm 00079 Fmt 4703 Sfmt 4703 29391 will be considered if it is practical to do so, but the NRC is able to ensure consideration only for comments received on or before this date. Although a time limit is given, comments and suggestions in connection with items for inclusion in guides currently being developed or improvements in all published guides are encouraged at any time. ADDRESSES: You may access information and comment submissions related to this document, which the NRC possesses and are publicly available, by searching on https://www.regulations.gov under Docket ID NRC–2012–0110. You may submit comments by any of the following methods: • Federal rulemaking Web site: Go to https://www.regulations.gov and search for Docket ID NRC–2012–0110. Address questions about NRC dockets to Carol Gallagher; telephone: 301–492–3668; email: Carol.Gallagher@nrc.gov. • Mail comments to: Cindy Bladey, Chief, Rules, Announcements, and Directives Branch (RADB), Office of Administration, Mail Stop: TWB–05– B01M, U.S. Nuclear Regulatory Commission, Washington, DC 20555– 0001. • Fax comments to: RADB at 301– 492–3446. For additional directions on accessing information and submitting comments, see ‘‘Accessing Information and Submitting Comments’’ in the SUPPLEMENTARY INFORMATION section of this document. FOR FURTHER INFORMATION CONTACT: Robert Carpenter, U.S. Nuclear Regulatory Commission, Washington, DC 20555–0001, telephone: 301–251– 7483 or email: Robert.Carpenter@nrc.gov. SUPPLEMENTARY INFORMATION: I. Accessing Information and Submitting Comments A. Accessing Information Please refer to Docket ID NRC–2012– 0110 when contacting the NRC about the availability of information regarding this document. You may access information related to this document, which the NRC possesses and is publicly available, by any of the following methods: • Federal Rulemaking Web Site: Go to https://www.regulations.gov and search for Docket ID NRC–2012–0110. • NRC’s Agencywide Documents Access and Management System (ADAMS): You may access publicly available documents online in the NRC Library at https://www.nrc.gov/readingrm/adams.html. To begin the search, E:\FR\FM\17MYN1.SGM 17MYN1 29392 Federal Register / Vol. 77, No. 96 / Thursday, May 17, 2012 / Notices select ‘‘ADAMS Public Documents’’ and then select ‘‘Begin Web-based ADAMS Search.’’ For problems with ADAMS, please contact the NRC’s Public Document Room (PDR) reference staff at 1–800–397–4209, 301–415–4737, or by email to pdr.resource@nrc.gov. The DGs and their corresponding regulatory analysis are available electronically under the following ADAMS Accession Numbers: DG–1285 (ML12012A006 and ML12013A089), DG–1286 (ML12017A053 and ML12017A052), DG–1287 (ML12017A054 and ML12017A059), and DG1288 (ML12017A076 and ML12017A077). • NRC’s PDR: You may examine and purchase copies of public documents at the NRC’s PDR, Room O1–F21, One White Flint North, 11555 Rockville Pike, Rockville, Maryland 20852. Regulatory guides are not copyrighted, and NRC approval is not required to reproduce them. mstockstill on DSK6TPTVN1PROD with NOTICES B. Submitting Comments Please include Docket ID NRC–2012– 0110 in the subject line of your comment submission, in order to ensure that the NRC is able to make your comment submission available to the public in this docket. The NRC cautions you not to include identifying or contact information that you do not want to be publicly disclosed in your comment submission. The NRC will post all comment submissions at https:// www.regulations.gov as well as enter the comment submissions into ADAMS. The NRC does not routinely edit comment submissions to remove identifying or contact information. If you are requesting or aggregating comments from other persons for submission to the NRC, then you should inform those persons not to include identifying or contact information that they do not want to be publically disclosed in their comment submission. Your request should state that the NRC does not routinely edit comment submissions to remove such information before making the comment submissions available to the public or entering the comment submissions into ADAMS. II. Further Information The NRC is issuing for public comment 4 draft regulatory guides in the NRC’s ‘‘Regulatory Guide’’ series. This series was developed to describe and make available to the public such information as methods that are acceptable to the NRC staff for implementing specific parts of the NRC’s regulations, techniques that the staff uses in evaluating specific VerDate Mar<15>2010 17:20 May 16, 2012 Jkt 226001 problems or postulated accidents, and data that the staff needs in its review of applications for permits and licenses. These 4 draft regulatory guides are temporarily identified by their task numbers, DG–1285, DG–1286, DG–1287, and DG–1288. The focus of the revisions to these RGs addresses the Commission’s Staff Requirements Memorandum (SRM) (SECY–11–0014, issued 3–15–2011), titled ‘‘Use of Containment Accident Pressure in Analyzing Emergency Core Cooling System and Containment Heat Removal System Pump Performance in Postulated Accidents’’ directing the staff to revise the discussion on defense-indepth. Specifically, the SRM stated, Because the statements in Regulatory Guide 1.174 are subject to different interpretations, the staff should revise this guide using precise language to assure that the defense-in-depth philosophy is interpreted and implemented consistently. To the extent that other regulatory guidance refers to defense in depth, the relevant documents should be updated also, as appropriate. In reviewing these RGs, it was observed that clarification could be added in several other places; for example: • The use of the terms ‘‘PRA technical acceptability,’’ ‘‘PRA technical adequacy,’’ and ‘‘PRA quality’’ were not clear. • References in the RGs, in places, have been either updated or are no longer in use. Although the focus of this proposed revision is to revise the discussion on defense-in-depth, the NRC staff believes that the identified clarifications should be addressed. In DG–1285 (proposed Rev. 3 of RG 1.174) the terms on PRA technical acceptability, PRA technical adequacy, and PRA quality are revised to be consistent with RG 1.200, ‘‘An Approach for Determining the Technical Adequacy of Probabilistic Risk Assessment Results for Risk-Informed Activities’’ and the references were updated. It is the intent of the staff, following the public review and comment period, to review all four RGs and identify administrative changes that will improve the consistency, quality, and usability of each guide. Stakeholders and the public are requested to provide any input regarding areas in these DGs where clarification and improvements may be needed. DG–1285, is proposed revision 3 of Regulatory Guide 1.174 dated May 2011, it provides guidance on an approach the NRC finds acceptable for analyzing issues associated with proposed changes to a plant’s licensing basis and for PO 00000 Frm 00080 Fmt 4703 Sfmt 4703 assessing the impact of these changes on the risk associated with plant design and operation. One key element to this type of decisionmaking is an engineering analysis of the proposed change. As part of the engineering analysis, licensees evaluate the impact of the change on maintaining adequate defense-in-depth. This proposed revision incorporates additional language and specific examples of how maintaining defense-in-depth is achieved when licensees use riskinformed analysis of proposed changes to the plant’s licensing basis. DG–1286, is proposed revision 1 of Regulatory Guide 1.175 dated August 1998, it provides an approach to using risk-informed decisionmaking in developing inservice testing programs for nuclear power plants. This revision updates the defense-in-depth evaluation to be consistent with the proposed changes to Regulatory Position 2.1.1 in draft Regulatory Guide DG–1285, (above) which provides guidance on evaluating proposed changes to a plant’s licensing basis, including changes to the inservice testing program. DG–1287, is proposed revision 2 of Regulatory Guide 1.177 dated May 2011, it describes a method acceptable to the NRC for using probabilistic risk analysis to evaluate proposed changes to a plant’s technical specifications. As in evaluating changes to a plant’s licensing basis, a key element in evaluating changes to technical specifications is an engineering analysis of the proposed change. As part of the engineering analysis, licensees evaluate the impact of the change on maintaining adequate defense-in-depth. This revision updates the defense-in-depth evaluation to be consistent with the proposed changes to Regulatory Position 2.1.1 in draft Regulatory Guide DG–1285, (above) which provides guidance on evaluating proposed changes to the plant’s technical specifications. DG–1288, is proposed revision 2 of Regulatory Guide 1.178 dated September 2003, it provides an approach to using risk-informed decisionmaking in developing inservice inspection programs for piping in nuclear power plants. This revision updates the defense-in-depth evaluation to be consistent with the proposed changes to Regulatory Position 2.1.1 in draft Regulatory Guide DG–1285, which provides guidance on evaluating proposed changes to a plant’s licensing basis, including changes to the inservice inspection program for piping systems. Dated at Rockville, Maryland, this 4th day of May 2012. E:\FR\FM\17MYN1.SGM 17MYN1 Federal Register / Vol. 77, No. 96 / Thursday, May 17, 2012 / Notices For the Nuclear Regulatory Commission. Thomas H. Boyce, Chief, Regulatory Guide Development Branch, Division of Engineering, Office of Nuclear Regulatory Research. [FR Doc. 2012–11958 Filed 5–16–12; 8:45 am] BILLING CODE 7590–01–P POSTAL REGULATORY COMMISSION [Docket Nos. MC2012–18 and CP2012–24; Order No. 1341] Product List Changes Postal Regulatory Commission. Notice. AGENCY: ACTION: The Commission is noticing a recently-filed Postal Service request to add First-Class Package Service Contract 2 the competitive product list. This notice addresses procedural steps associated with this filing. DATES: Supplemental Information is due (from Postal Service): May 18, 2012. Comments are due: May 22, 2012. ADDRESSES: Submit comments electronically via the Commission’s Filing Online system at https:// www.prc.gov. Commenters who cannot submit their views electronically should contact the person identified in FOR FURTHER INFORMATION CONTACT by telephone for advice on alternatives to electronic filing. FOR FURTHER INFORMATION CONTACT: Stephen L. Sharfman, General Counsel at 202–789–6820. SUPPLEMENTARY INFORMATION: SUMMARY: Table of Contents I. Introduction II. Notice of Filings III. Ordering Paragraphs mstockstill on DSK6TPTVN1PROD with NOTICES I. Introduction In accordance with 39 U.S.C. 3642 and 39 CFR 3020.30 et seq., the Postal Service filed a formal request and associated supporting information to add First-Class Package Service Contract 2 to the Competitive Product List.1 The Postal Service asserts that First-Class Package Service Contract 2 is ‘‘a competitive product not of general applicability within the meaning of 39 U.S.C. 3632(b)(3).’’ Id. at 1. The Request has been assigned Docket No. MC2012– 18. The Postal Service contemporaneously filed a redacted 1 Request of the United States Postal Service to Add First-Class Package Service Contract 2 to Competitive Product List and Notice of Filing (Under Seal) of Unredacted Governors’ Decision, Contract, and Supporting Data, May 9, 2012 (Request). VerDate Mar<15>2010 17:20 May 16, 2012 Jkt 226001 contract related to the proposed new product. Id., Attachment B. The instant contract has been assigned Docket No. CP2012–24. Request. To support its Request, the Postal Service filed the following six attachments: • Attachment A—a redacted version of the Governors’ Decision and accompanying analysis. An explanation and justification is provided in the Governors’ Decision and analysis filed in the unredacted version under seal; • Attachment B—a redacted version of the instant contract; • Attachment C—the proposed changes in the Mail Classification Schedule with the addition underlined; • Attachment D—a Statement of Supporting Justification as required by 39 CFR 3020.32; • Attachment E—a certification of compliance with 39 U.S.C. 3633(a)(1), (2), and (3); and • Attachment F—an application for non-public treatment of the materials filed under seal. The materials filed under seal are the unredacted version of the instant contract and the required cost and revenue data. In the Statement of Supporting Justification, Dennis R. Nicoski, Manager, Field Sales Strategy and Contracts, asserts that the instant contract will cover its attributable costs, make a positive contribution to cover institutional costs, and increase contribution toward the requisite 5.5 percent of the Postal Service’s institutional costs. Id., Attachment D at 1. Mr. Nicoski contends that there will be no issue of subsidization of market dominant products by competitive products as a result of the instant contract. Id. Instant contract. The Postal Service included a redacted version of the instant contract with the Request. Id., Attachment B. It is scheduled to become effective on the day the Commission issues all necessary regulatory approval (Effective Date). Id. at 2. It will expire 1 year from the Effective Date unless, among other things, either party terminates the agreement with 30 days written notice to the other party. Id. The Postal Service represents that the related contract is consistent with 39 U.S.C. 3633. Id., Attachment D. The Postal Service filed much of the supporting materials, including the unredacted version of the instant contract, under seal. Id., Attachment F. It maintains that the unredacted Governors’ Decision, the unredacted version of the instant contract, and supporting documents establishing compliance with 39 U.S.C. 3633 and 39 CFR 3015.5 should remain confidential. PO 00000 Frm 00081 Fmt 4703 Sfmt 9990 29393 Id. at 1. The Postal Service asks the Commission to protect customeridentifying information from public disclosure indefinitely. Id. Supplemental information. The Commission notes that the Postal Service contemporaneously filed five other First-Class Package Service contracts in separate dockets. The financial workpapers that support each contract use the same volume distribution percentages. Please provide the basis for the volume distribution for each contract. Please file this information by May 18, 2012. II. Notice of Filings The Commission establishes Docket Nos. MC2012–18 and CP2012–24 to consider the Request and the instant contract, respectively. Interested persons may submit comments on whether the Postal Service’s filings in these dockets are consistent with the policies of 39 U.S.C. 3632, 3633, or 3642, 39 CFR 3015.5, and 39 CFR part 3020, subpart B. Comments are due no later than May 22, 2012. The public portions of these filings can be accessed via the Commission’s Web site (https://www.prc.gov). The Commission appoints Katalin K. Clendenin to serve as Public Representative in these dockets. III. Ordering Paragraphs It is ordered: 1. The Commission establishes Docket Nos. MC2012–18 and CP2012–24 to consider the matters raised in each docket. 2. Pursuant to 39 U.S.C. 505, Katalin K. Clendenin is appointed to serve as officer of the Commission (Public Representative) to represent the interests of the general public in these proceedings. 3. Comments by interested persons in these proceedings are due no later than May 22, 2012. 4. The supplemental information discussed in the body of this order is due no later than May 18, 2012. 5. The Secretary shall arrange for publication of this order in the Federal Register. By the Commission. Ruth Ann Abrams, Acting Secretary. [FR Doc. 2012–11979 Filed 5–16–12; 8:45 am] BILLING CODE 7710–FW–P E:\FR\FM\17MYN1.SGM 17MYN1

Agencies

[Federal Register Volume 77, Number 96 (Thursday, May 17, 2012)]
[Notices]
[Pages 29391-29393]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2012-11958]


=======================================================================
-----------------------------------------------------------------------

NUCLEAR REGULATORY COMMISSION

[NRC-2012-0110]


An Approach for Probabilistic Risk Assessment in Risk-Informed 
Decisions on Plant-Specific Changes to the Licensing Basis

AGENCY: Nuclear Regulatory Commission.

ACTION: Draft regulatory guide; request for comment.

-----------------------------------------------------------------------

SUMMARY: The U.S. Nuclear Regulatory Commission (NRC or the Commission) 
is issuing for public comment four (4) draft regulatory guides (DGs), 
DG-1285, ``An Approach for Probabilistic Risk Assessment in Risk-
Informed Decisions on Plant-Specific Changes to the Licensing Basis,'' 
(proposed Revision 3 of Regulatory Guide [RG] 1.174); DG-1286, ``An 
Approach for Plant-Specific, Risk-Informed Decisionmaking: Inservice 
Testing,'' (proposed Revision 1 of RG 1.175); DG 1287, ``An Approach 
for Plant-Specific, Risk-Informed Decisionmaking: Technical 
Specifications'' (proposed Revision 2 of RG 1.177); and DG-1288, ``An 
Approach for Plant-Specific Risk-Informed Decisionmaking for Inservice 
Inspection of Piping'' (proposed Revision 2 of RG 1.178). These guides 
describe methods the NRC staff considers acceptable for plant-specific, 
risk-informed decisionmaking on specific licensee activities.

DATES: Submit comments by June 29, 2012. Comments received after this 
date will be considered if it is practical to do so, but the NRC is 
able to ensure consideration only for comments received on or before 
this date. Although a time limit is given, comments and suggestions in 
connection with items for inclusion in guides currently being developed 
or improvements in all published guides are encouraged at any time.

ADDRESSES: You may access information and comment submissions related 
to this document, which the NRC possesses and are publicly available, 
by searching on https://www.regulations.gov under Docket ID NRC-2012-
0110. You may submit comments by any of the following methods:
     Federal rulemaking Web site: Go to https://www.regulations.gov and search for Docket ID NRC-2012-0110. Address 
questions about NRC dockets to Carol Gallagher; telephone: 301-492-
3668; email: Carol.Gallagher@nrc.gov.
     Mail comments to: Cindy Bladey, Chief, Rules, 
Announcements, and Directives Branch (RADB), Office of Administration, 
Mail Stop: TWB-05-B01M, U.S. Nuclear Regulatory Commission, Washington, 
DC 20555-0001.
     Fax comments to: RADB at 301-492-3446.
    For additional directions on accessing information and submitting 
comments, see ``Accessing Information and Submitting Comments'' in the 
SUPPLEMENTARY INFORMATION section of this document.

FOR FURTHER INFORMATION CONTACT: Robert Carpenter, U.S. Nuclear 
Regulatory Commission, Washington, DC 20555-0001, telephone: 301-251-
7483 or email: Robert.Carpenter@nrc.gov.

SUPPLEMENTARY INFORMATION: 

I. Accessing Information and Submitting Comments

A. Accessing Information

    Please refer to Docket ID NRC-2012-0110 when contacting the NRC 
about the availability of information regarding this document. You may 
access information related to this document, which the NRC possesses 
and is publicly available, by any of the following methods:
     Federal Rulemaking Web Site: Go to https://www.regulations.gov and search for Docket ID NRC-2012-0110.
     NRC's Agencywide Documents Access and Management System 
(ADAMS): You may access publicly available documents online in the NRC 
Library at https://www.nrc.gov/reading-rm/adams.html. To begin the 
search,

[[Page 29392]]

select ``ADAMS Public Documents'' and then select ``Begin Web-based 
ADAMS Search.'' For problems with ADAMS, please contact the NRC's 
Public Document Room (PDR) reference staff at 1-800-397-4209, 301-415-
4737, or by email to pdr.resource@nrc.gov. The DGs and their 
corresponding regulatory analysis are available electronically under 
the following ADAMS Accession Numbers: DG-1285 (ML12012A006 and 
ML12013A089), DG-1286 (ML12017A053 and ML12017A052), DG-1287 
(ML12017A054 and ML12017A059), and DG1288 (ML12017A076 and 
ML12017A077).
     NRC's PDR: You may examine and purchase copies of public 
documents at the NRC's PDR, Room O1-F21, One White Flint North, 11555 
Rockville Pike, Rockville, Maryland 20852.
    Regulatory guides are not copyrighted, and NRC approval is not 
required to reproduce them.

B. Submitting Comments

    Please include Docket ID NRC-2012-0110 in the subject line of your 
comment submission, in order to ensure that the NRC is able to make 
your comment submission available to the public in this docket.
    The NRC cautions you not to include identifying or contact 
information that you do not want to be publicly disclosed in your 
comment submission. The NRC will post all comment submissions at https://www.regulations.gov as well as enter the comment submissions into 
ADAMS. The NRC does not routinely edit comment submissions to remove 
identifying or contact information.
    If you are requesting or aggregating comments from other persons 
for submission to the NRC, then you should inform those persons not to 
include identifying or contact information that they do not want to be 
publically disclosed in their comment submission. Your request should 
state that the NRC does not routinely edit comment submissions to 
remove such information before making the comment submissions available 
to the public or entering the comment submissions into ADAMS.

II. Further Information

    The NRC is issuing for public comment 4 draft regulatory guides in 
the NRC's ``Regulatory Guide'' series. This series was developed to 
describe and make available to the public such information as methods 
that are acceptable to the NRC staff for implementing specific parts of 
the NRC's regulations, techniques that the staff uses in evaluating 
specific problems or postulated accidents, and data that the staff 
needs in its review of applications for permits and licenses.
    These 4 draft regulatory guides are temporarily identified by their 
task numbers, DG-1285, DG-1286, DG-1287, and DG-1288. The focus of the 
revisions to these RGs addresses the Commission's Staff Requirements 
Memorandum (SRM) (SECY-11-0014, issued 3-15-2011), titled ``Use of 
Containment Accident Pressure in Analyzing Emergency Core Cooling 
System and Containment Heat Removal System Pump Performance in 
Postulated Accidents'' directing the staff to revise the discussion on 
defense-in-depth. Specifically, the SRM stated,

    Because the statements in Regulatory Guide 1.174 are subject to 
different interpretations, the staff should revise this guide using 
precise language to assure that the defense-in-depth philosophy is 
interpreted and implemented consistently. To the extent that other 
regulatory guidance refers to defense in depth, the relevant 
documents should be updated also, as appropriate.

    In reviewing these RGs, it was observed that clarification could be 
added in several other places; for example:
     The use of the terms ``PRA technical acceptability,'' 
``PRA technical adequacy,'' and ``PRA quality'' were not clear.
     References in the RGs, in places, have been either updated 
or are no longer in use.
    Although the focus of this proposed revision is to revise the 
discussion on defense-in-depth, the NRC staff believes that the 
identified clarifications should be addressed. In DG-1285 (proposed 
Rev. 3 of RG 1.174) the terms on PRA technical acceptability, PRA 
technical adequacy, and PRA quality are revised to be consistent with 
RG 1.200, ``An Approach for Determining the Technical Adequacy of 
Probabilistic Risk Assessment Results for Risk-Informed Activities'' 
and the references were updated. It is the intent of the staff, 
following the public review and comment period, to review all four RGs 
and identify administrative changes that will improve the consistency, 
quality, and usability of each guide. Stakeholders and the public are 
requested to provide any input regarding areas in these DGs where 
clarification and improvements may be needed.
    DG-1285, is proposed revision 3 of Regulatory Guide 1.174 dated May 
2011, it provides guidance on an approach the NRC finds acceptable for 
analyzing issues associated with proposed changes to a plant's 
licensing basis and for assessing the impact of these changes on the 
risk associated with plant design and operation. One key element to 
this type of decisionmaking is an engineering analysis of the proposed 
change. As part of the engineering analysis, licensees evaluate the 
impact of the change on maintaining adequate defense-in-depth. This 
proposed revision incorporates additional language and specific 
examples of how maintaining defense-in-depth is achieved when licensees 
use risk-informed analysis of proposed changes to the plant's licensing 
basis.
    DG-1286, is proposed revision 1 of Regulatory Guide 1.175 dated 
August 1998, it provides an approach to using risk-informed 
decisionmaking in developing inservice testing programs for nuclear 
power plants. This revision updates the defense-in-depth evaluation to 
be consistent with the proposed changes to Regulatory Position 2.1.1 in 
draft Regulatory Guide DG-1285, (above) which provides guidance on 
evaluating proposed changes to a plant's licensing basis, including 
changes to the inservice testing program.
    DG-1287, is proposed revision 2 of Regulatory Guide 1.177 dated May 
2011, it describes a method acceptable to the NRC for using 
probabilistic risk analysis to evaluate proposed changes to a plant's 
technical specifications. As in evaluating changes to a plant's 
licensing basis, a key element in evaluating changes to technical 
specifications is an engineering analysis of the proposed change. As 
part of the engineering analysis, licensees evaluate the impact of the 
change on maintaining adequate defense-in-depth. This revision updates 
the defense-in-depth evaluation to be consistent with the proposed 
changes to Regulatory Position 2.1.1 in draft Regulatory Guide DG-1285, 
(above) which provides guidance on evaluating proposed changes to the 
plant's technical specifications.
    DG-1288, is proposed revision 2 of Regulatory Guide 1.178 dated 
September 2003, it provides an approach to using risk-informed 
decisionmaking in developing inservice inspection programs for piping 
in nuclear power plants. This revision updates the defense-in-depth 
evaluation to be consistent with the proposed changes to Regulatory 
Position 2.1.1 in draft Regulatory Guide DG-1285, which provides 
guidance on evaluating proposed changes to a plant's licensing basis, 
including changes to the inservice inspection program for piping 
systems.

    Dated at Rockville, Maryland, this 4th day of May 2012.


[[Page 29393]]


    For the Nuclear Regulatory Commission.

Thomas H. Boyce,
Chief, Regulatory Guide Development Branch, Division of Engineering, 
Office of Nuclear Regulatory Research.
[FR Doc. 2012-11958 Filed 5-16-12; 8:45 am]
BILLING CODE 7590-01-P
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