Letter Sequence Other |
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Results
Other: ML13225A592, ML13338A624, ML14356A004, ML15058A420, ML15068A215, ML15134A459, RS-13-113, First Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049), RS-14-195, Third Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Reliable Spent Fuel Pool Instrumentation (Order Number EA-12-051), RS-14-205, Third Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049), RS-15-026, Fourth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Reliable Spent Fuel Pool Instrumentation (Order Number EA-12-051), RS-15-208, Fifth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049), RS-15-276, Report of Full Compliance with March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049), RS-16-020, Sixth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)
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MONTHYEARRS-13-113, First Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)2013-08-28028 August 2013
First Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)
Project stage: Other
BW130080, Withdrawal of License Candidate from the September 4, 2013 Pressurized Water Reactor (PWR) Generic Fundamentals Examination2013-08-29029 August 2013
Withdrawal of License Candidate from the September 4, 2013 Pressurized Water Reactor (PWR) Generic Fundamentals Examination
Project stage: Request
05000456/LER-2013-001, Inadequate Operability Determination Procedure Guidance Results in Inadvertent Missed Technical Specification Action for Diesel Generator2013-09-30030 September 2013
Inadequate Operability Determination Procedure Guidance Results in Inadvertent Missed Technical Specification Action for Diesel Generator
Project stage: Request
ML13338A6242013-12-0909 December 2013
Mega-Tech Services, LLC, Technical Evaluation Report Regarding the Overall Integrated Plan for Braidwood Station, Units 1 and 2, TAC Nos.: MF0895 and MF0896
Project stage: Other
ML13225A5922013-12-17017 December 2013
Interim Staff Evaluation Relating to Overall Integrated Plan in Response to Order EA-12-049 (Mitigation Strategies)
Project stage: Other
RS-14-205, Third Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)2014-08-28028 August 2014
Third Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)
Project stage: Other
RS-14-195, Third Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Reliable Spent Fuel Pool Instrumentation (Order Number EA-12-051)2014-09-0505 September 2014
Third Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Reliable Spent Fuel Pool Instrumentation (Order Number EA-12-051)
Project stage: Other
ML14356A0042014-12-30030 December 2014
Plan for the Onsite Audit Regarding Implementation of Mitigating Strategies and Reliable Spent Fuel Instrumentation Related to Orders EA-12-049 and EA-12-051
Project stage: Other
RS-15-083, Request for Schedule Relief/Relaxation from NRC Order EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events2015-02-26026 February 2015
Request for Schedule Relief/Relaxation from NRC Order EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events
Project stage: Request
ML15057A0732015-02-26026 February 2015
Annual Fatigue Report for 2014
Project stage: Request
RS-15-026, Fourth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Reliable Spent Fuel Pool Instrumentation (Order Number EA-12-051)2015-02-27027 February 2015
Fourth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Reliable Spent Fuel Pool Instrumentation (Order Number EA-12-051)
Project stage: Other
ML15058A4202015-02-27027 February 2015
Fourth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying License with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)
Project stage: Other
ML15068A2152015-04-15015 April 2015
Relaxation of the Schedule Requirements for Order EA-12-049 Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond Design Basis External Events
Project stage: Other
ML15134A4592015-05-27027 May 2015
Report for the Audit Regarding Implementation of Mitigating Strategies and Reliable Spent Fuel Pool Instrumentation Related to Orders EA-12-049 and EA-12-051
Project stage: Other
RS-15-208, Fifth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)2015-08-28028 August 2015
Fifth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)
Project stage: Other
RS-15-276, Report of Full Compliance with March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)2015-12-16016 December 2015
Report of Full Compliance with March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)
Project stage: Other
RS-16-020, Sixth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)2016-02-26026 February 2016
Sixth Six-Month Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)
Project stage: Other
2014-09-05
[Table View] |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Mr. Bryan C. Hanson President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 April 15, 2015
SUBJECT:
BRAIDWOOD STATION, UNIT 1 - RELAXATION OF THE SCHEDULE REQUIREMENTS FOR ORDER EA-12-049 "ORDER MODIFYING LICENSES WITH REGARD TO REQUIREMENTS FOR MITIGATION STRATEGIES FOR BEYOND-DESIGN-BASIS EXTERNAL EVENTS" (TAC NO. MF0895)
Dear Mr. Hanson:
By letter dated March 12, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12054A735), the U.S. Nuclear Regulatory Commission (NRG) ordered Exelon Generation Company, LLC (Exelon, the licensee) to take certain actions at Braidwood Station, Unit 1, associated with the Fukushima Near-Term Task Force Recommendations. Order EA-12-049 directed that actions be taken by licensees to develop and implement strategies to maintain or restore core cooling, reactor coolant system inventory, containment cooling, and spent fuel pool (SFP) cooling capabilities during beyond-design-basis external events.
Section IV of the order states that licensees proposing to deviate from requirements contained in NRG Order EA-12-049 may request that the Director, Office of Nuclear Reactor Regulation, relax or rescind certain requirements. By letter dated February 26, 2015 (ADAMS Accession No. ML15058A745) the licensee informed the NRG of its request for an extension of one additional refueling cycle to carry out the order requirement of Condition IV.A.2, which requires full implementation of the order requirements no later than two refueling cycles after submittal of the overall integrated plan, or by December 31, 2016, whichever comes first. The licensee stated that its mitigation strategies are based on generic Westinghouse reactor coolant pump (RCP) seal leakage rates. Recent Westinghouse evaluations of RCP seal leakage in response to Westinghouse Nuclear Safety Advisory Letter (NSAL) 14-1 indicate that the generic leak rates previously used by the licensee for its mitigation strategy do not envelope calculated leakage rates applicable to the Braidwood Station, Unit 1, design.
Exelon stated that the Pressurized-Water Reactor Owners Group (PWROG) is in the process of performing additional evaluations to refine RCP seal leakage rate projections, which are part of the technical bases for demonstrating Braidwood Station, Unit 1, compliance with the requirements of NRG Order EA-12-049. The licensee requests to delay the order implementation date for Braidwood Station, Unit 1, from the completion of the April 2015 refueling outage to the completion of the fall 2016 refueling outage. This additional time will allow Exelon to complete the engineering analysis associated with the additional information provided by the PWROG regarding the analytical basis for RCP seal leakage. In addition, Exelon stated that the requested relaxation would allow additional time to resolve RCP No. 1 seal leakoff line pressure concerns.
In light of the facts presented in the licensee's February 26, 2015 letter, the NRC staff has determined that the licensee has demonstrated good cause for a relaxation of the order implementation date. Completing the Braidwood Station, Unit 1, specific engineering analysis of revised generic RCP seal leakage is a significant endeavor that requires assessment of additional information that will be provided by the PWROG and the development of a site-specific evaluation. The schedule for completing these additional activities does not support Braidwood Station, Unit 1, compliance with Order EA-12-049 by the restart from the April 2015 refueling outage. The NRC staff also considered that, following the accident at Fukushima Dai-ichi, the NRC concluded that a sequence of events such as the Fukushima Dai-ichi accident is unlikely to occur in the United States based on the current regulatory requirements and existing plant capabilities. Given the plant-specific circumstances at Braidwood Station, Unit 1, and that the proposed compliance date is prior to the December 2016 implementation date of the order, the NRC staff approves the relaxation request.
Accordingly, based upon the authority granted to the Director, Office of Nuclear Reactor Regulation, the requirement of the order for full order implementation for Braidwood Station, Unit 1, is relaxed until the completion of the fall 2016 refueling outage. The licensee did not request relaxation of the requirement for full implementation for Braidwood Station, Unit 2, so that requirement for full implementation by the completion of the Unit 2 Fall 2015 refueling outage is unchanged.
If you have any questions, please contact John Hughey at 301-415-3204.
Sincerely, Docket No. STN 50-456 cc: Listserv
ML15068A215
- via e-mail OFFICE NRR/JLD/JOMB/PM NRR/JLD/LA*p NRR/DORL/LPL3-2/PM OE NAME JHughey Slent JWiebe RFretz DATE 03/09/15 03/06/15 03/09/15 03/11/15 OFFICE OGC (NLO)
NRR/JLD/JOMB/BC(A)
NRR/JLD/D NRR/D NAME DCylkowski MHalter JDavis WDean DATE 03/23/15 04/10/15 04/13/15 04/15/15
