ML111990112

Request for Additional Information Regarding Third Inservice Inspection Interval Relief Requests RR-11-01 and RR11-02

ML111990112
Person / Time
Site:	Three Mile Island
Issue date:	07/27/2011
From:	Peter Bamford Plant Licensing Branch 1
To:	Pacilio M Exelon Nuclear
Bamford, Peter J., NRR/DORL 415-2833
References
TAC ME5670, TAC ME5671
Download: ML111990112 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 July 27,2011 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

THREE MILE ISLAND NUCLEAR STATION, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING THIRD INSERVICE INSPECTION INTERVAL RELIEF REQUESTS RR-11-01 AND RR-11-02 (TAC NOS. ME5670 AND ME5671)

Dear Mr. Pacilio:

By letter dated February 10, 2011 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML110410126), Exelon Generation Company, LLC (Exelon, the licensee) submitted two relief requests for Three Mile Island Nuclear Station, Unit 1 (TMI-1) associated with the third inservice inspection interval. The first request, RR-11-01, concerns requirements for examination of steam generator welds that were replaced in the 2009 refueling outage. The second request, RR-11-02, concerns the pre-service examination of four (4) High Pressure Injection circumferential valve to safe-end welds installed in the 2009 refueling outage.

The Nuclear Regulatory Commission staff has been reviewing the submittal and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed request for additional information (RAj). The questions were sent via electronic transmission on July 20, 2011, to Mr. Thomas Loomis, of your staff. The draft questions were 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. The draft questions were discussed in a teleconference with your staff on July 22, 2011. It was agreed that a response to this RAI would be submitted by September 1,2011.

Please contact me at 301-415-2833, if you have any questions.

Sincerely,

~!Zu~~

Peter Ba:f:;;*l~;ect Manager Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-289

Enclosure:

As stated cc: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION THREE MILE ISLAND NUCLEAR STATION, UNIT 1 RELIEF REQUESTS CONCERNING THE THIRD INSERVICE INSECTION INTERVAL RELIEF REQUESTS NUMBERS RR-11-01 AND RR-11-02 DOCKET NO. 50-289 By letter dated February 10, 2011 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML110410126), Exelon Generation Company, LLC (Exelon, the licensee) submitted two relief requests for Three Mile Island Nuclear Station, Unit 1 (TMI-1) associated with the third inservice inspection interval. The first request, RR-11-01, concerns requirements for examination of steam generator welds that were replaced in the 2009 Refueling Outage. The second request, RR-11-02, concerns the pre-service examination of four (4) High Pressure Injection circumferential valve to safe end welds installed in the 2009 Refueling Outage. The U.S. Nuclear Regulatory Commission staff has been reviewing the submittal and has determined that additional information is needed to complete its review.

RR-11-01

1. Describe the specific limitations for each item as to why 100% of the required inspection volume cannot be examined, i.e., what configuration, interference or other reason prevented 100% ultrasonic examination coverage of the item in question?

RR-11-02

1. The submittal states that due to valve geometry, code coverage is limited to 50%.

Please describe Exelon's best effort attempt to achieve maximum coverage in/through the cast austenitic stainless steel portion of these welds.

2. A pre-replacement typical valve to safe-end configuration was provided. Has the configuration changed post-replacement?

Enclosure

July 27, 2011 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

THREE MILE ISLAND NUCLEAR STATION, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING THIRD INSERVICE INSPECTION INTERVAL RELIEF REQUESTS RR-11-01 AND RR-11-02 (TAC NOS. ME5670 AND ME5671)

Dear Mr. Pacilio:

By letter dated February 10, 2011 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML110410126), Exelon Generation Company, LLC (Exelon, the licensee) submitted two relief requests for Three Mile Island Nuclear Station, Unit 1 (TMI-1) associated with the third inservice inspection interval. The first request, RR-11-01, concerns requirements for examination of steam generator welds that were replaced in the 2009 refueling outage. The second request, RR-11-02, concerns the pre-service examination of four (4) High Pressure Injection circumferential valve to safe-end welds installed in the 2009 refueling outage.

The Nuclear Regulatory Commission staff has been reviewing the submittal and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed request for additional information (RAI). The questions were sent via electronic transmission on July 20, 2011, to Mr. Thomas Loomis, of your staff. The draft questions were 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. The draft questions were discussed in a teleconference with your staff on July 22,2011. It was agreed that a response to this RAI would be submitted by September 1, 2011.

Please contact me at 301-415-2833, if you have any questions.

Sincerely, Ira!

Peter Bamford, Project Manager Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-289

Enclosure:

As stated cc: Distribution via Listserv DISTRIBUTION:

RidsNrrPMThreeMilelsland Resource PUBLIC LPLI-2 R/F RidsAcrsAcnw_MailCTR Resource RidsNrrDciCpnb Resource RidsOgcRp Resource RidsRgn 1MailCenter Resource RidsNrrDorlDpr Resource RidsNrrDorlLpl1-2 Resouce RidsNrrLAABaxter Resource MAudrain, NRR RidsNrrDciCvib Resource EAndruszkiewicz, NRR ADAMS Accession Number: ML111990112 "concurrence via email OFFICE LPL 1-2/PM LPL1-2/LA CPNB/BC CVIB/BC LPLI-2/BC NAME PBamford ABaxter TLupold* MMitchell* HChernoff DATE 07/22/2011 0712612011 07/13/2011 07111/2011 07127/2011 OFFICIAL RECORD COpy