ML073410462

Request for Additional Information Regarding Proposed Type a Test Extension

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 Regional Administrator, Region I Site Vice President U.S. Nuclear Regulatory Commission Limerick Generating Station 475 Allendale Road Exelon Generation Company, LLC King of Prussia, PA 19406 P.O. Box 2300 Sanatoga, PA 19464 Senior Resident Inspector U.S. Nuclear Regulatory Commission Ed Callan Limerick Generating Station Plant Manager P.O. Box 596 Limerick Generating Station Pottstown, PA 19464 Exelon Generation Company, LLC P.O. Box 2300 Library Sanatoga, PA 19464 U.S. Nuclear Regulatory Commission Region I Regulatory Assurance Manager - Limerick 475 Allendale Road Exelon Generation Company, LLC King of Prussia, PA 19406 P.O. Box 2300 Sanatoga, PA 19464 Director, Bureau of Radiation Protection Pennsylvania Dept. of Environmental Vice President - Operations, Mid-Atlantic Protection Exelon Generation Company, LLC Rachel Carson State Office Building 200 Exelon Way, KSA 3-N P.O. Box 8469 Kennett Square, PA 19348 Harrisburg, PA 17105-8469 Vice President Chairman Licensing and Regulatory Affairs Board of Supervisors of Limerick Township Exelon Generation Company, LLC 646 West Ridge Pike 4300 Winfield Road Linfield, PA 19468 Warrenville, IL 60555 Dr. Judith Johnsrud Director National Energy Committee Licensing and Regulatory Affairs Sierra Club Exelon Generation Company, LLC 433 Orlando Avenue 200 Exelon Way, KSA 3-E State College, PA 16803 Kennett Square, PA 19348 J. Bradley Fewell, Esquire Manager Licensing Associate General Counsel Limerick Generating Station Exelon Generation Company, LLC Exelon Generation Company, LLC 4300 Winfield Road 200 Exelon Way, KSA 3-E Warrenville, IL 60555 Kennett Square, PA 19348 Mr. Charles G. Pardee Correspondence Control Desk Chief Nuclear Officer and Senior Vice Exelon Generation Company, LLC President P.O. Box 160 Exelon Generation Company, LLC Kennett Square, PA 19348 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

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.

ENCLOSURE