ML073410462
| ML073410462 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/13/2007 |
| From: | Peter Bamford NRC/NRR/ADRO/DORL/LPLI-2 |
| To: | Pardee C Exelon Generation Co |
| Bamford, Peter J., NRR/DORL 415-2833 | |
| References | |
| TAC MD5198, TAC MD5199 | |
| Download: ML073410462 (4) | |
Text
December 13, 2007 Mr. Charles G. Pardee Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
LIMERICK GENERATING STATION, UNIT NOS. 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED TYPE A TEST EXTENSION (TAC NOS. MD5198 AND MD5199)
Dear Mr. Pardee:
By letter dated February 20, 2007, (Agencywide Documents Access and Management System Accession No. ML070530296) Exelon Generation Company, LLC, submitted a license amendment request regarding a one-time extension of the Type A Integrated Leak Rate Test Interval from 10 to 15 years for Limerick Generating Station, Unit Nos. 1 and 2.
The U.S. 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 questions in the enclosure were sent to Mr. Thomas Loomis of your staff via electronic transmission in draft form on November 8, 2007. The draft RAI was sent to ensure that the questions were understandable, the regulatory basis for the questions was clear and to determine if the information was previously docketed. During a telephone call with Mr. Loomis on December 6, 2007, a response date of December 21, 2007, was agreed upon.
Please contact me at 301-415-2833 if you have any questions.
Sincerely,
/ra/
Peter J. Bamford, Project Manager Plant Licensing Branch 1-2 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:
Christopher Mudrick Site Vice President Limerick Generating Station Exelon Generation Company, LLC P.O. Box 2300 Sanatoga, PA 19464 Ed Callan 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 J. Bradley Fewell, Esquire Associate General Counsel Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Mr. Charles G. Pardee Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
December 13, 2007 Mr. Charles G. Pardee Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
LIMERICK GENERATING STATION, UNIT NOS. 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED TYPE A TEST EXTENSION (TAC NOS. MD5198 AND MD5199)
Dear Mr. Pardee:
By letter dated February 20, 2007, (Agencywide Documents Access and Management System Accession No. ML070530296) Exelon Generation Company, LLC, submitted a license amendment request regarding a one-time extension of the Type A Integrated Leak Rate Test Interval from 10 to 15 years for Limerick Generating Station, Unit Nos. 1 and 2.
The U.S. 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 questions in the enclosure were sent to Mr. Thomas Loomis of your staff via electronic transmission in draft form on November 8, 2007. The draft RAI was sent to ensure that the questions were understandable, the regulatory basis for the questions was clear and to determine if the information was previously docketed. During a telephone call with Mr. Loomis on December 6, 2007, a response date of December 21, 2007, was agreed upon.
Please contact me at 301-415-2833 if you have any questions.
Sincerely,
/ra/
Peter J. 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 RidsNrrPMPBamford RidsNrrLAABaxter RidsOgcRp RidsAcrsAcnwMailCenter RidsNrrDorlLpl1-2 RidsRgn1MailCenter RidsNrrDorlDpr RidsNrrDeEmcb HAshar, NRR GThomas, NRR Accession Number: ML073410462
- Concurrence provided by email OFFICE LPL1-2/PM LPL1-2/LA EMCB/BC LPL1-2/BC NAME PBamford ABaxter KManoly*
HChernoff DATE 12/7/07 12/12/07 11/07/2007 12/13/07 Official Record Copy
ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION REGARDING TECHNICAL SPECIFICATION CHANGES FOR TYPE A INTEGRATED LEAK RATE TEST INTERVAL EXTENSION LIMERICK GENERATING STATION, UNIT NOS. 1 AND 2 DOCKET NOS. 50-352 AND 50-353 By letter dated February 20, 2007 (Agencywide Documents Access and Management System Accession No. ML070530296), Exelon Generation Company, LLC, submitted a license amendment request (LAR) for Limerick Generating Station, Unit Nos. 1 and 2. The proposed amendment would provide a one-time extension of the containment Type A Integrated Leak Rate Test interval from 10 years to 15 years for each unit.
The Nuclear Regulatory Commission (NRC) Staff has been reviewing the submittal and has determined that additional information is needed to complete its review.
In Section 4.4 titled Containment Inspections in Attachment 1 of the LAR, it is stated that during the most recent Unit 1, American Society of Mechanical Engineers (ASME) Code,Section XI, Subsection IWE, examinations, One (1) recordable indication of a pit in the suppression pool steel liner was isolated from further corrosion by performing a qualified coating repair. The remaining wall thickness under this pit was greater than the required design minimum wall thickness.
Previously, one other less severe pit was similarly isolated. In order to help the NRC staff understand the nature of the pitting degradation and its management, please provide the following information.
- 1.
The extent, depth, location/environment and root cause of these pits in the suppression pool liner of Unit 1, the corrective actions taken and evaluations performed that deemed them to be acceptable. Explain how the required design minimum wall thickness was determined. What actions are being taken to monitor these indications to ensure that there is no further deterioration of degradation and explain why ASME Code, Subsection IWE, augmented examinations are not required?
- 2.
Provide information of the nature, extent, depth, locations/environment and cause of other pitting degradation indications that have been previously found, if any, on the suppression pool liners of both Units 1 and 2 and how they are being managed.