ML072010266
| ML072010266 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 07/27/2007 |
| From: | Peter Bamford NRC/NRR/ADRO/DORL/LPLI-2 |
| To: | Crane C Exelon Generation Co, Exelon Nuclear |
| Bamford, Peter J., NRR/DORL 415-2833 | |
| References | |
| TAC MD3710, TAC MD3711 | |
| Download: ML072010266 (5) | |
Text
July 27, 2007 Mr. Christopher M. Crane President and Chief Nuclear Officer Exelon Nuclear Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348
SUBJECT:
LIMERICK GENERATING STATION UNIT NOS. 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED EMERGENCY DIESEL GENERATOR TECHNICAL SPECIFICATION TESTING CHANGES (TAC NOS. MD3710 AND MD3711)
Dear Mr. Crane:
By letter dated November 27, 2006, Exelon Generation Company, LLC submitted a request for an amendment to the technical specifications (TSs) for Limerick Generating Station, Unit Nos. 1 and 2. The amendment would modify various TS testing requirements for the emergency diesel generators.
The Nuclear Regulatory Commission has determined that a response to the enclosed Request for Additional Information (RAI) is necessary in order for the staff to complete its review. The question in the enclosure was sent to Mr. Glenn Stewart of your staff via electronic transmission on July 12, 2007. The draft RAI was sent to ensure that it was understandable, the regulatory basis for the question was clear and to determine if the information was previously docketed.
The question was discussed with your staff in a teleconference on July 19, 2007, where additional clarification was provided. It was agreed that your response would be provided within 30 days of the date of this letter.
Please contact me at 301-415-2833 if you have any questions.
Sincerely,
/ra/(Ed Miller for)
Peter Bamford, Project Manager Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-352 and 50-353
Enclosure:
As stated cc w/encl: See next page
Limerick Generating Station, Unit Nos. 1 and 2 cc:
Site Vice President Limerick Generating Station Exelon Generation Company, LLC P.O. Box 2300 Sanatoga, PA 19464 Plant Manager Limerick Generating Station Exelon Generation Company, LLC P.O. Box 2300 Sanatoga, PA 19464 Regulatory Assurance Manager - Limerick Exelon Generation Company, LLC P.O. Box 2300 Sanatoga, PA 19464 Vice President - Operations, Mid-Atlantic Exelon Generation Company, LLC 200 Exelon Way, KSA 3-N Kennett Square, PA 19348 Vice President Licensing and Regulatory Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Director Licensing and Regulatory Affairs Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348 Manager Licensing Limerick Generating Station Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348 Correspondence Control Desk Exelon Generation Company, LLC P.O. Box 160 Kennett Square, PA 19348 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Senior Resident Inspector U.S. Nuclear Regulatory Commission Limerick Generating Station P.O. Box 596 Pottstown, PA 19464 Library U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406 Director, Bureau of Radiation Protection Pennsylvania Dept. of Environmental Protection Rachel Carson State Office Building P.O. Box 8469 Harrisburg, PA 17105-8469 Chairman Board of Supervisors of Limerick Township 646 West Ridge Pike Linfield, PA 19468 Dr. Judith Johnsrud National Energy Committee Sierra Club 433 Orlando Avenue State College, PA 16803 Associate General Counsel Exelon Generating Company, LLC 4300 Winfield Road Warrenville, IL 60555
Limerick Generating Station, Unit Nos. 1 and 2 cc:
Mr. Christopher M. Crane President & Chief Nuclear Officer Exelon Generating Company, LLC 4300 Winfield Road Warrenville, IL 60555
July 27, 2007 Mr. Christopher M. Crane President and Chief Nuclear Officer Exelon Nuclear Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348
SUBJECT:
LIMERICK GENERATING STATION UNIT NOS. 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED EMERGENCY DIESEL GENERATOR TECHNICAL SPECIFICATION TESTING CHANGES (TAC NOS.
MD3710 AND MD3711)
Dear Mr. Crane:
By letter dated November 27, 2006, Exelon Generation Company, LLC submitted a request for an amendment to the technical specifications (TSs) for Limerick Generating Station, Unit Nos. 1 and 2. The amendment would modify various TS testing requirements for the emergency diesel generators.
The Nuclear Regulatory Commission has determined that a response to the enclosed Request for Additional Information (RAI) is necessary in order for the staff to complete its review. The question in the enclosure was sent to Mr. Glenn Stewart of your staff via electronic transmission on July 12, 2007. The draft RAI was sent to ensure that it was understandable, the regulatory basis for the question was clear and to determine if the information was previously docketed.
The question was discussed with your staff in a teleconference on July 19, 2007, where additional clarification was provided. It was agreed that your response would be provided within 30 days of the date of this letter.
Please contact me at 301-415-2833 if you have any questions.
Sincerely,
/ra/(Ed Miller for)
Peter Bamford, Project Manager Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-352 and 50-353
Enclosure:
As stated cc w/encl: See next page DISTRIBUTION:
PUBLIC LPL1-2 R/F RidsNrrDorlLplb RidsNrrPMPBamford RidsOgcRp RidsAcrsAcnwMailCenter RidsNrrLAEWhitt MMcConnell RidsRgn1MailCenter RidsNrrDorlDpr RidsNrrDorlLpl1-2 RidsNrrDeEeeb Accession Number: ML072010266
- Concurrence provided by memo OFFICE LPL1-2/PM LPL3-2/LA EEEB/BC LPL1-2/BC NAME PBamford EWhitt GWilson HChernoff DATE 7/23/07 7/23/07 07/11/2007*
7/27/07 Official Record Copy
ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION LIMERICK GENERATING STATION, UNITS 1 AND 2 DOCKET NOS. 50-352 AND 50-353 By letter dated November 27, 2006, Agencywide Documents Access and Management System Accession No. ML063310230, Exelon Generation Company, LLC submitted a license amendment request regarding the technical specifications (TSs) for Limerick Generating Station (LGS), Units 1 and 2. The proposed changes would modify the TS testing requirements for the emergency diesel generators (EDGs). Based on the review of the information provided by the licensee, the Nuclear Regulatory Commission staff has the following additional question.
Page 9 of Attachment 1 of the November 27, 2006, submittal states the following:
Consistent with RG [Regulatory Guide] 1.9, the 1.8 seconds specified is equal to 60% of the 3-second load sequence interval associated with sequencing the next load following the RHR
[residual heat removal] pumps in response to an undervoltage on the electrical bus concurrent with a LOCA [loss of coolant accident]. The change is acceptable because, based on RG 1.9 recommendations, it provides assurance that EDG [emergency diesel generator] frequency does not exceed predetermined limits and that frequency stability is sufficient to support proper load sequencing following a rejection of the largest single load.
Furthermore, page 13 of Attachment 1 of the November 27, 2006, submittal lists RG 1.9, Revision 2 as a reference.
Is it your intent to fully commit to RG 1.9, Revision 2? If so, clearly indicate your intent in writing. If not, provide a detailed technical justification for relaxing the acceptance criteria currently contained in your TSs for the EDG load rejection test.