ML15295A425
| ML15295A425 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 10/28/2015 |
| From: | Martin R Plant Licensing Branch II |
| To: | Pierce C Southern Nuclear Operating Co |
| Martin R | |
| References | |
| CAC MF5579, CAC MF5580 | |
| Download: ML15295A425 (3) | |
Text
Mr. C. R. Pierce Regulatory Affairs Director UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 October 28, 2015 Southern Nuclear Operating Company, Inc.
P. 0. Box 1295/Bin
- 038 Birmingham, AL 35201-1295
SUBJECT:
EDWIN I. HATCH NUCLEAR PLANT, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION (CAC NOS. MF5579 AND MF5580)
Dear Mr. Pierce:
The U.S. Nuclear Regulatory Commission (NRC) staff is continuing its review of the Southern Nuclear Operating Company, Inc. (SNC), license amendment request (LAR), dated January 13, 2015, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15014A411) to Revise Technical Specifications Regarding Generic Letter 2008-01, Managing Gas Accumulation, in accordance with TSTF-523, Revision 2, for the Edwin I. Hatch Nuclear Plant, Units 1 and 2. We have determined that additional information is necessary as follows.
Your response to RAI 1 a states "If a system is currently running and the 31 day frequency should occur, monitoring the system running parameters... ensures that the system is meeting its system requirements for the required surveillance." If the system is running with sufficient flow, monitoring the running parameters is effective. However, if the flow is low, the gas voids may not transport through the system. Additionally, stagnant branch lines in an operating system may be susceptible to gas accumulation. Please explain how you take into consideration the flowrate of the operating system and the stagnant branch lines when crediting the running system as meeting the surveillance.
C. Please provide a response within thirty (30) days of the date of this letter.
Docket Nos.: 50-321, 50-366 cc: Distribution via Listserv Sincerely, 130)/J/J~
f~?b M'rt~l,*senior Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
- email dated OFFICE NRR/LPLll-1/PM NRR/LPLll-1/LA NRR/SRXB/BC*
NRR/LPLll-1/BC NRR/LPLll-1/PM NAME BMartin SFigueroa CJackson RPascarelli BMartin DATE 10/22/15 10/26/15 10/19/15*
10/28/15 10/28/15