Entergy Operations, Inc., River Bend Station, Unit 1, 50454-50455 [2013-20146]

Agencies

• NUCLEAR REGULATORY COMMISSION

[Federal Register Volume 78, Number 160 (Monday, August 19, 2013)]
[Notices]
[Pages 50454-50455]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2013-20146]


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NUCLEAR REGULATORY COMMISSION

[Docket Nos. 50-458; NRC-2013-0190]


Entergy Operations, Inc., River Bend Station, Unit 1

AGENCY: Nuclear Regulatory Commission.

ACTION: Environmental assessment and finding of no significant impact; 
issuance.

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ADDRESSES: Please refer to Docket ID NRC-2013-0190 when contacting the 
NRC about the availability of information regarding this document. You 
may access publicly-available information related to this action by the 
following methods:
     Federal Rulemaking Web site: Go to https://www.regulations.gov and search for Docket ID NRC-2013-0190. Address 
questions about NRC dockets to Carol Gallagher; telephone: 301-287-
3422; email: Carol.Gallagher@nrc.gov. For technical questions, contact 
the individual(s) listed in the FOR FURTHER INFORMATION CONTACT section 
of this document.
     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, 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 ADAMS accession number 
for each document referenced in this notice is provided the first time 
that a document is referenced. The application for exemption dated 
August 23, 2012, is available in ADAMS under Accession No. ML12241A250.
     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.

SUPPLEMENTARY INFORMATION: 

I. Introduction

    The U.S. Nuclear Regulatory Commission (NRC) is considering 
issuance of an exemption from part 50 of Title 10 of the Code of 
Federal Regulations (10 CFR), appendix J for Facility Operating License 
No. NPF-47, issued to Entergy Operations, Inc. (the licensee), for 
operation of the River Bend Station, Unit 1 (RBS), located in West 
Feliciana Parish, Louisiana. Therefore, as required by 10 CFR 51.21, 
the NRC performed an environmental assessment. Based on the results of 
the environmental assessment, the NRC is issuing a finding of no 
significant impact.

II. Environmental Assessment

Identification of the Proposed Action

    The proposed action would exempt the licensee from certain 
provisions of 10 CFR part 50, appendix J, ``Primary Reactor Containment 
Leakage Testing for Water-Cooled Power Reactors.'' This appendix 
requires that components which penetrate containment be periodically 
leak tested at the ``Pa,'' defined as the ``calculated peak 
containment internal pressure related to the design basis accident 
specified either in the technical specification or associated bases.'' 
The NRC noted a conflict between Entergy's interpretation of 
Pa and the literal reading of the definition of 
Pa in the regulations.
    For the extended power uprate, Entergy had re-performed the 
containment pressure analysis and determined that the calculated peak 
pressure in containment occurs in a localized area of the wetwell 
within a few seconds after a postulated main steamline break. The NRC 
believes that as defined in the regulations the value of Pa 
should have been revised. The new calculation demonstrates that the 
localized pressure in the wetwell quickly drops and equalizes 
throughout the containment to a value of 3.6 pounds per square inch 
gauge (psig). Entergy has stated it believes the new calculated long-
term peak containment pressure of 3.6 psig is the correct value to be 
used for Pa. However, to avoid a large number of procedural 
changes to reflect this new peak value, Entergy did not propose to 
change the current Technical Specification (TS) value of Pa 
(7.6 psig).
    The exemption would allow RBS to continue to use the pre-extended 
power uprate value of 7.6 psig rather than use the newly calculated 
localized pressure spike value of 9.3 psig in the wetwell for 
Pa. The NRC staff examined the licensee's rationale to 
support the exemption request and concluded that the use the value of 
7.6 psig for Pa would meet the underlying purpose of 10 CFR 
part 50, appendix J. Supporting the use of this alternate value is:
    (1) The time for the pressure spike to occur and fall to 
equilibrium is 6 seconds, which is not sufficient time to release 
source terms from the core,
    (2) the pressure spike is also localized to the wetwell area which 
makes up roughly 10 percent of containment,
    (3) the number of containment penetrations in this area is limited. 
Therefore, the current Pa value of 7.6 psig meets the intent 
of 10 CFR part 50, appendix J by bounding the peak bulk containment 
pressure (3.6 psig) and assuring that leakage through the primary 
containment does not exceed allowable leakage rate values,
    (4) the calculated peak bulk containment pressure is 3.6 psig so 
the TS value of 7.6 is conservative for the use of determining 
containment leakage, and
    (5) this request is consistent with the determination that the NRC 
staff has reached for other licensees under similar conditions based on 
the same considerations.
    Therefore, the Pa TS value of 7.6 psig meets the intent 
of 10 CFR part 50, appendix J by bounding the peak bulk

[[Page 50455]]

containment pressure and assuring that leakage through the primary 
containment does not exceed allowable leakage rate values.
    The proposed exemption would allow RBS to continue to use an 
alternate definition of Pa of 7.6 psig. This use of the 
alternate definition for Pa meets the intent of 10 CFR part 
50, appendix J because it provides testing of the primary containment 
parameters at a bounding pressure that is calculated to be possible 
throughout containment over a sustained period following a design basis 
accident.

The Need for the Proposed Action

    The proposed exemption is needed to allow RBS to continue to use an 
alternate definition for Pa which results in the use of a 
lower pressure for appendix J containment testing. Use of the lower 
pressure reduces the burden of modifying the test procedures, seeking 
NRC authorization to change the current TS value, and conducting the 
testing at the higher pressure. In addition, applying the literal 
definition for Pa would not serve the underlying purpose of 
the rule which is to test the primary containment parameters at a peak 
pressure calculated to exist over the long term following a design 
basis accident.

Environmental Impacts of the Proposed Action

    The NRC has completed its evaluation of the proposed action and 
concludes that the exemption described above meets the intended purpose 
of the requirements in 10 CFR part 50, appendix J. The lower calculated 
Pa value provides a representative bounding pressure for 
evaluating the leak-tight integrity of the primary reactor containment 
and related penetrations.
    The proposed action will not significantly increase the probability 
or consequences of accidents. No changes are being made in the types of 
effluents that may be released offsite. There is no significant 
increase in the amount of any effluent released offsite. There is no 
significant increase in occupational or public radiation exposure. 
Therefore, there are no significant radiological environmental impacts 
associated with the proposed action.
    With regard to potential non-radiological impacts, the proposed 
action does not have any foreseeable impacts to land, air, or water 
resources, including impacts to biota. In addition, there are also no 
known socioeconomic or environmental justice impacts associated with 
such proposed action. Therefore, there are no significant non-
radiological environmental impacts associated with the proposed action.
    Accordingly, the NRC concludes that there are no significant 
environmental impacts associated with the proposed action.

Environmental Impacts of the Alternatives to the Proposed Action

    As an alternative to the proposed action, the staff considered 
denial of the proposed action (i.e., the ``no-action'' alternative). 
Denial of the application would result in no change in current 
environmental impacts. The environmental impacts of the proposed action 
and the alternative action are similar.

Alternative Use of Resources

    The action does not involve the use of any different resources than 
those previously considered in the ``Final Environmental Statement,'' 
NUREG-1073, January 1985, for the RBS.

Agencies and Persons Notified

    In accordance with its stated policy, on August 6, 2013, the staff 
notified the Louisiana State official, Ji Wiley, of the Louisiana 
Department of Environmental Quality, Radiation Protection Division, 
regarding the environmental impact of the proposed action. The State 
official had no comments.

III. Finding of No Significant Impact

    On the basis of the environmental assessment, the NRC concludes 
that the proposed action will not have a significant effect on the 
quality of the human environment. Accordingly, the NRC has determined 
not to prepare an environmental impact statement for the proposed 
action.
    For further details with respect to the proposed action, see the 
licensee's letter dated August 23, 2012.

    Dated at Rockville, Maryland, this 9th day of August 2013. For 
the Nuclear Regulatory Commission.
Michael T. Markley,
Chief, Plant Licensing Branch IV, Division of Operating Reactor 
Licensing, Office of Nuclear Reactor Regulation.
[FR Doc. 2013-20146 Filed 8-16-13; 8:45 am]
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