Letter Sequence Supplement |
|---|
TAC:ME9764, Clarify Application of Setpoint Methodology for LSSS Functions (Approved, Closed) |
|
MONTHYEARGNRO-2012/00096, License Amendment Request for Implementing a 24-Month Fuel Cycle, Grand Gulf Nuclear Station, Unit 12012-10-0202 October 2012
License Amendment Request for Implementing a 24-Month Fuel Cycle, Grand Gulf Nuclear Station, Unit 1
Project stage: Request
ML12289A1582012-10-15015 October 2012
Acceptance Review Email, License Amendment Request to Revise Technical Specifications and Surveillance Requirements to Support Operation with a 24-Month Fuel Cycle in Accordance with Generic Letter 91-04
Project stage: Acceptance Review
ML13077A3662013-03-18018 March 2013
Email, Request for Additional Information, License Amendment Request to Revise Technical Specifications and Surveillance Requirements to Support Operation with a 24-Month Fuel Cycle in Accordance with Generic Letter 91-04
Project stage: RAI
GNRO-2013/00023, Supplement to the License Amendment Request for Implementing a 24-Month Fuel Cycle2013-04-26026 April 2013
Supplement to the License Amendment Request for Implementing a 24-Month Fuel Cycle
Project stage: Supplement
ML13121A3912013-05-0101 May 2013
Email, Request for Additional Information, Round 2, Request to Revise Technical Specifications and Surveillance Requirements to Support Operation with a 24-Month Fuel Cycle in Accordance with Generic Letter 91-04
Project stage: RAI
GNRO-2013/00038, Response to Request for Additional Information Regarding 18 to 24 Month License Amendment Request (TAC ME9764) Dated May 1, 20132013-06-0404 June 2013
Response to Request for Additional Information Regarding 18 to 24 Month License Amendment Request (TAC ME9764) Dated May 1, 2013
Project stage: Response to RAI
ML13171A2252013-06-20020 June 2013
Email, Audit Plan for 6/24/13 Audit for Review of Calculations in Support of Amendment Request to Revise Technical Specifications and Surveillance Requirements for Operation with a 24-Month Fuel Cycle in Accordance with GL 91-04
Project stage: Other
GNRO-2013/00058, Response to NRC Regulatory Issue Summary 2013-06, Preparation and Scheduling of Operator Licensing Examinations2013-08-14014 August 2013
Response to NRC Regulatory Issue Summary 2013-06, Preparation and Scheduling of Operator Licensing Examinations
Project stage: Request
GNRO-2013/00024, Response to Request for Additional Information Re 18 to 24 Month License Amendment Request, Dated March 18, 20132013-08-15015 August 2013
Response to Request for Additional Information Re 18 to 24 Month License Amendment Request, Dated March 18, 2013
Project stage: Response to RAI
ML13260A0062013-09-16016 September 2013
Email, Request for Additional Information, Round 3, Request to Revise Technical Specifications and Surveillance Requirements to Support Operation with a 24-Month Fuel Cycle in Accordance with Generic Letter 91-04
Project stage: RAI
GNRO-2013/00076, Supplemental Information to Clarify License Amendment Request for Implementing a 24-Month Fuel Cycle at Grand Gulf Nuclear Station, Unit 12013-09-24024 September 2013
Supplemental Information to Clarify License Amendment Request for Implementing a 24-Month Fuel Cycle at Grand Gulf Nuclear Station, Unit 1
Project stage: Supplement
ML13323A5512013-10-0808 October 2013
Attachment 2 to GNRO-2013/00088, JC-Q1B21-N678-1 Rev. 2 Reactor Steam Dome Pressure Scram Setpoint
Project stage: Other
ML13323A5522013-10-14014 October 2013
Attachment 3 to GNRO-2013/00088, JC-Q1B21-N681-1 Rev. 1 Reactor Pressure Vessel Level One Setpoint Calculation
Project stage: Other
GNRO-2013/00074, Response to Electronic Request for Additional Information Regarding 18 to 24 Month License Amendment Request, Dated September 16, 20132013-10-14014 October 2013
Response to Electronic Request for Additional Information Regarding 18 to 24 Month License Amendment Request, Dated September 16, 2013
Project stage: Request
ML13323A5532013-10-29029 October 2013
Attachment 4 to GNRO-2013/00088, JC-Q1B21-N694-1 Rev. 1 Drywell High Pressure RCIC Isolation Setpoint Calculation
Project stage: Other
ML13323A5542013-11-0404 November 2013
Attachment 5 to GNRO-2013/00088, EN-IC-S-022-G Rev. 0 Instrument Performance Monitoring and Drift Trending Analysis
Project stage: Other
ML13323A5502013-11-0808 November 2013
Attachment 1 to GNRO-2013/00088 JC-Q1P81-90024 Rev. 3 Division III Degraded Bus Voltage Setpoint
Project stage: Other
GNRO-2013/00088, Supplemental Response to Request for Additional Information Regarding 18 to 24 Month Fuel Cycle License Amendment Request (TAC ME9764), Dated May 1, 20132013-11-12012 November 2013
Supplemental Response to Request for Additional Information Regarding 18 to 24 Month Fuel Cycle License Amendment Request (TAC ME9764), Dated May 1, 2013
Project stage: Supplement
GNRO-2013/00094, Supplement to License Amendment Request for Implementing a 24-Month Fuel Cycle2013-12-0505 December 2013
Supplement to License Amendment Request for Implementing a 24-Month Fuel Cycle
Project stage: Supplement
GNRO-2013/00097, Request to Withdraw Supplement to the License Amendment Request for Implementing a 24-Month Fuel Cycle2013-12-11011 December 2013
Request to Withdraw Supplement to the License Amendment Request for Implementing a 24-Month Fuel Cycle
Project stage: Supplement
ML13343A1092013-12-26026 December 2013
Issuance of Amendment No. 197, Revise Technical Specifications and Surveillance Requirements to Support Operation with 24-Month Fuel Cycle in Accordance with Generic Letter 91-04
Project stage: Approval
2013-12-26
[Table View] |
Text
GNRO-201 September 2013 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
SUBJECT:
REFERENCE:
Dear Sir or Madam:
Supplemental Information to clarify License Amendment Request for Implementing a 24-Month Fuel Cycle at Grand Gulf Nuclear Station, Unit
- 1. Re: Attachment 5 on Page 21 of 50 for Section 3.6.5.3 Drywell Isolation Valves.
Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 License No. NPF-29 1.
License Amendment Request for Implementing a 24-Month Fuel Cycle, dated October 2,2012 (Accession No. ML12277A080, GNRO-2012/00096)
On October 2,2012, Entergy OPerations, Inc. (Entergy) submitted a license amendment request (Reference 1) to the U.S. Nuclear Regulatory Commission (NRC) to implement a 24-month fuel cycle at Grand Gulf Nuclear Station (GGNS). Entergy is providing, in the Attachment, supplemental information to clarify the Drywellisolation Valve section found on page 21 of 50 in contained in Reference 1.
This letter contains no new commitments. If you have any questions, please contact Mr.
Christopher Robinson at (601) 437-7326.
I declare under penalty of perjury that the foregoing is true and correct. Executed on the 24th day of September, 2013.
Sincerely, KJM/jas next page)
cc:
U.S. Nuclear Regulatory Commission ATTN: Mr. Alan Wang, NRR/DORL (w/2)
Mail Stop OWFN/8 B1 Washington, DC 20555-0001 NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150
Attachment to GNRO-2013/00076 Supplemental Information to Clarify Attachment 5 Drywell Isolation Valve Section of License Amendment Request for Implementing a 24-Month Fuel Cycle, Dated October 2, 2012
Attachment to GNRO-2013/00076 1
1 SR 3.6.5.3.4 actuates to isolation....Ac*iTit"'l..... on The test of this SR is being increased from once every 18 months to once every 24 months, for a maximum interval of 30 months including the grace period. During the operating cycle, automatic drywell isolation valve isolation times are tested per SR 3.6.5.3.3 in accordance with the In-service Testing Program. Stroke testing of drywell isolation valves tests a significant portion of the circuitry as well as the mechanical function, which will detect failures of this circuitry or failures with valve movement. The frequency of this testing is typically quarterly, unless approved relief has been granted justifying less frequent testing.
A review of the applicable Grand Gulf surveillance history revealed one previous failure of TS SR 3.6.5.3.4.demonstrated that the dr)°Nell isolation valves had one previous failures of the TS function that would have been detected solely by the periodic performance of this SR. l\\s such, the impact, if any, on system availability is minimal from the proposed change to a 24 month testing frequency.
On September 24, 2002, thfee...four valves (1 P72-F123. 1P72-F124, 1P72-F126 and 1P45-F274) did not close on an isolation signal. It was determined that relay 1M71 R065, which controls all thfee...four valves, failed to de-energize with its plunger stuck in the energized position. MAl 321408 replaced the Agastat relay and performed satisfactory retesting with all Technical Specifications acceptance criteria met. CR 2002-1936 documented this issue.
The identified failure is unique and not a repetitive failure and is not associated v'Iith any time based failure mechanism GGNS replaces this Agastat relay every 10 years under PMRQ 50024914. GGNS instituted this PMRQ as a result of generic industry concerns/awareness of repetitive Agastat relay failures. The replacement schedule of 10 years is in advance of the environmentally-qualified design life of 14.4 years. Therefore. no age-related failures are expected. Therefore, this failure will have no impact on an extension to a 24 month surveillance interval.
Based on other more frequent testing of the system, and the history of system performance, the impact of this change on safety, if any, is small.
