Reactor Vessel Material Surveillance Program, 12876-12877 [2019-06418]

Agencies

• NUCLEAR REGULATORY COMMISSION

[Federal Register Volume 84, Number 64 (Wednesday, April 3, 2019)]
[Rules and Regulations]
[Pages 12876-12877]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-06418]


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NUCLEAR REGULATORY COMMISSION

10 CFR Part 50

[NRC-2017-0151]
RIN 3150-AK07


Reactor Vessel Material Surveillance Program

AGENCY: Nuclear Regulatory Commission.

ACTION: Regulatory basis; availability.

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SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is publishing a 
regulatory basis to support a rulemaking that would amend the NRC's 
regulations for the light-water power reactor vessel material 
surveillance programs. The rulemaking would reduce the regulatory 
burden associated with the testing of specimens contained within 
surveillance capsules, and reporting the surveillance test results. The 
NRC has completed a regulatory basis that demonstrates there is 
sufficient justification to proceed with rulemaking. The NRC is 
providing the basis for rulemaking for public information, but is not 
seeking public comment on the regulatory basis at this time.

DATES: The regulatory basis is available April 3, 2019.

ADDRESSES: Please refer to Docket ID NRC-2017-0151 when contacting the 
NRC about the availability of information for this action. You may 
obtain publicly-available information related to this action by any of 
the following methods:
     Federal Rulemaking Website: Go to https://www.regulations.gov and search for Docket ID NRC-2017-0151. Address 
questions about NRC dockets to Carol Gallagher; telephone: 301-415-
3463; email: [email protected]. For technical questions, contact 
the individual listed in the FOR FURTHER INFORMATION CONTACT section of 
this document.
     NRC's Agencywide Documents Access and Management System 
(ADAMS): You may obtain publicly-available documents online in the 
ADAMS Public Documents collection at https://www.nrc.gov/reading-rm/adams.html. To begin the search, 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 [email protected]. The regulatory basis is available in 
ADAMS under Accession No. ML18057A005.
     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.

FOR FURTHER INFORMATION CONTACT: Stewart Schneider, Office of Nuclear 
Material Safety and Safeguards, U.S. Nuclear Regulatory Commission, 
Washington, DC 20555-0001; telephone: 301-415-4123, email: 
[email protected].

SUPPLEMENTARY INFORMATION: 

I. Background

    Appendix H, ``Reactor Vessel Material Surveillance Program 
Requirements'' (appendix H), to part 50 of title 10 of the Code of 
Federal Regulations (10 CFR), ``Domestic Licensing of Production and 
Utilization Facilities,'' requires light-water nuclear power reactor 
licensees to have a reactor vessel (RV) material surveillance program 
to monitor changes in the fracture toughness properties of the RV 
materials adjacent to the reactor core. Unless it can be shown that the 
end of design life neutron fluence is below certain criteria, the NRC 
requires licensees to implement an RV materials surveillance program 
that tests irradiated material specimens that are located in 
surveillance capsules in the RVs. The program evaluates changes in 
material fracture toughness and thereby assesses the integrity of the 
RV. For each capsule withdrawal, the test procedures and reporting 
requirements must meet the requirements of American Society for Testing 
and Materials International (ASTM) E 185-82, ``Standard Recommended 
Practice for Conducting Surveillance Tests for Light-Water Cooled 
Reactor Vessels,'' to the extent practicable for the configuration of 
the specimens in the capsule. The design of the surveillance program 
and the withdrawal schedule must meet the requirements of the edition 
of ASTM E 185 that is current on the issue date of the ASME Code to 
which the RV was purchased. Later editions of ASTM E 185, up to and 
including those editions through 1982, may be used. In sum, the 
surveillance program must comply with ASTM E 185, as modified by 
appendix H to 10 CFR part 50. The number, design, and location of these 
surveillance capsules within the RV are established during the design 
of the program, before initial plant operation.
    Appendix H to 10 CFR part 50 also specifies that each capsule 
withdrawal and the test results must be the subject of a summary 
technical report to be submitted within 1 year of the date of capsule 
withdrawal, unless an extension is granted by the Director, Office of 
Nuclear Reactor Regulation. The NRC uses the results from the 
surveillance program to assess licensee submittals related to pressure-
temperature limits in accordance with appendix G, ``Fracture Toughness 
Requirements,'' to 10 CFR part 50 and to assess pressurized water 
reactor licensee's compliance with Sec.  50.61, ``Fracture toughness 
requirements for protection against pressurized thermal shock events,'' 
or Sec.  50.61a, ``Alternate fracture toughness requirements for 
protection against pressurized thermal shock events.''
    In 2001, the NRC began a rulemaking to revise appendix G to 10 CFR 
part 50 (RIN 3150-AG98; NRC-2008-0582) to eliminate the pressure-
temperature limits related to the metal temperature of the RV closure 
head flange and vessel flange areas. The NRC expanded the rulemaking 
scope in 2008 to include revisions to appendix H to 10 CFR part 50, 
because the fracture toughness analysis required by appendix G to 10 
CFR part 50 relies on data obtained from the RV material surveillance 
program established under appendix H to 10 CFR part 50.
    In COMSECY-14-0027, ``Rulemaking to Revise Title 10, Code of 
Federal Regulations, Part 50, Appendix H, `Reactor Vessel Material 
Surveillance Program Requirements,' '' issued on

[[Page 12877]]

June 25, 2014 (not publicly available), the NRC staff requested 
Commission approval to separate the rulemaking activities to revise 
appendices G and H to 10 CFR part 50, and to proceed immediately with 
rulemaking for appendix H to 10 CFR part 50.
    In staff requirements memorandum (SRM) to COMSECY-14-0027, dated 
August 8, 2014 (not publicly available), the Commission approved the 
staff's recommendation to proceed with a separate rulemaking for 
appendix H to 10 CFR part 50. The SRM to COMSECY-14-0027 directed the 
NRC staff to begin the appendix H to 10 CFR part 50 rulemaking 
independent of the completion date or conclusions of the appendix G to 
10 CFR part 50 technical basis development activities.

II. Discussion

    The NRC has prepared a regulatory basis to support a rulemaking 
that would amend the NRC's testing and reporting requirements in 
appendix H to 10 CFR part 50. In the regulatory basis, the NRC 
concluded that it has sufficient justification to proceed with 
rulemaking to amend appendix H to 10 CFR part 50.
    Testing Requirements. Appendix H to 10 CFR part 50 requires RV 
surveillance programs to include Charpy impact specimens from welds, 
base metal, and the weld heat-affected zone materials and tensile 
specimens from welds and base metal materials. The NRC is proposing to 
conduct a rulemaking to reduce the testing of some specimens and 
eliminate the testing of other specimens that do not provide meaningful 
information to assess RV integrity. This decision is based on 
substantial material data, knowledge, and experience attained through 
the many years of RV surveillance program implementation. Specifically, 
the requirements to test weld heat-affected zone specimens and examine 
thermal monitors would be eliminated. Also, the NRC is proposing to 
reduce the number of tensile specimens that require testing and specify 
that testing correlation monitor material is optional. The proposed 
changes would reduce the burden to licensees for specimen testing, 
without having an adverse effect on public health and safety and the 
environment.
    Reporting Requirements. Appendix H to 10 CFR part 50 requires 
licensees to submit test results to the NRC no later than 1 year after 
capsule withdrawal. As stated in the 1983 rulemaking (48 FR 24008; May 
27, 1983), the primary purposes of the requirement are timely reporting 
of test results and notification of any problems. At the time of the 
1983 rulemaking there was a limited amount of data from irradiated 
materials from which to estimate embrittlement trends of RVs at nuclear 
power plants; thus, making it crucial for the timely reporting of test 
results. An extensive amount of embrittlement data now exists, and 
embrittlement mechanisms are well-understood. The 1-year reporting 
requirement has become a hardship for some licensees because of the 
implementation of integrated surveillance programs (which require 
significant coordination among multiple licensees and hot-cell 
laboratories) and because capsules with higher neutron fluence levels 
may need longer periods of radioactive decay before capsule shipping 
and testing can be performed. As a result, licensees have been 
requesting an additional 6 months to submit reports. To reduce the 
burden on licensees to prepare these extension requests and for the NRC 
to review and approve these requests, the NRC is proposing rulemaking 
to increase the reporting period from 1 year to 18 months. This change 
would not have an adverse effect on public health and safety and the 
environment.
    Rulemaking Process. The NRC has evaluated the planned amendments to 
appendix H to 10 CFR part 50 and has determined that, if implemented, 
there would not be an adverse effect on public health and safety. In 
addition, the NRC has analyzed the costs to conduct this rulemaking and 
has determined that the most efficient approach is to use the direct 
final rule process. This abbreviated process would minimize the use of 
agency resources and potentially allow the revised requirements to 
become effective sooner, thus providing licensees the benefits of the 
rule change sooner. Although the NRC does not anticipate receiving 
public comments that are significant and adverse, the NRC's rulemaking 
process for this action will provide the public an opportunity to 
comment on the direct final rule. Read more about the direct final rule 
process on the NRC's public website, at https://www.nrc.gov/about-nrc/regulatory/rulemaking/rulemaking-process/direct-final-rule.html.

III. Publicly-Available Documents

    As the NRC continues its ongoing rulemaking effort to revise the 
requirements for an RV materials surveillance program, the NRC is 
making documents publicly available on the Federal rulemaking website, 
www.regulations.gov, under Docket ID NRC-2017-0151. The current status 
of this rulemaking effort, as well as other NRC planned rulemaking 
activities, can be found on the NRC's public website at https://www.nrc.gov/reading-rm/doc-collections/rulemaking-ruleforum/active/RuleIndex.html.
    The NRC may post additional materials relevant to this rulemaking 
at www.regulations.gov, under Docket ID NRC-2017-0151. Please take the 
following actions if you wish to receive alerts when changes or 
additions occur in a docket folder: (1) Navigate to the docket folder 
(NRC-2017-0151); (2) click the ``Email Alert'' link; and (3) enter your 
email address and select how frequently you would like to receive 
emails (daily, weekly, or monthly).

    Dated at Rockville, Maryland, this 28th day of March 2019.

    For the Nuclear Regulatory Commission.
Annette L. Vietti-Cook,
Secretary for the Commission.
[FR Doc. 2019-06418 Filed 4-2-19; 8:45 am]
 BILLING CODE 7590-01-P