ML111990096

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

ML111990096
Person / Time
Site:	Three Mile Island
Issue date:	07/20/2011
From:	Peter Bamford Plant Licensing Branch 1
To:	Chernoff H Plant Licensing Branch 1
Bamford, Peter J., NRR/DORL 415-2833
References
TAC ME5670, TAC ME5671
Download: ML111990096 (3)

Text

July 20, 2011 MEMORANDUM TO: Harold K. Chernoff, Chief Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation FROM: Peter Bamford, Project Manager /ra/

Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

SUBJECT:

THREE MILE ISLAND, UNIT NO. 1 - ELECTRONIC TRANSMISSION, DRAFT REQUEST FOR ADDITIONAL INFORMATION REGARDING THIRD INSERVICE INSPECTION INTERVAL RELIEF REQUESTS RR-11-01 AND RR-11-02 (TAC NOS. ME5670 AND ME5671)

The attached draft request for additional information (RAI) was transmitted by electronic transmission on July 20, 2011 to Mr. Thomas Loomis, at Exelon Generation Company, LLC (Exelon, the licensee). This draft RAI was transmitted to facilitate the technical review being conducted by the Nuclear Regulatory Commission (NRC) staff and to support a conference call (if needed) with Exelon in order to clarify the licensees relief requests regarding the third interval inservice inspection program. The draft RAI is related to the licensees submittal dated February 10, 2011. The draft questions were sent to ensure that they were understandable, the regulatory basis was clear, and to determine if the information was previously docketed.

Additionally, review of the draft RAI would allow Exelon to evaluate and agree upon a schedule to respond to the RAI. This memorandum and the attachment do not represent an NRC staff position.

Docket Nos. 50-289

Enclosure:

As stated

July 20, 2011 MEMORANDUM TO: Harold K. Chernoff, Chief Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation FROM: Peter Bamford, Project Manager /ra/

Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

SUBJECT:

THREE MILE ISLAND, UNIT NO. 1 - ELECTRONIC TRANSMISSION, DRAFT REQUEST FOR ADDITIONAL INFORMATION REGARDING THIRD INSERVICE INSPECTION INTERVAL RELIEF REQUESTS RR-11-01 AND RR-11-02 (TAC NOS. ME5670 AND ME5671)

The attached draft request for additional information (RAI) was transmitted by electronic transmission on July 20, 2011 to Mr. Thomas Loomis, at Exelon Generation Company, LLC (Exelon, the licensee). This draft RAI was transmitted to facilitate the technical review being conducted by the Nuclear Regulatory Commission (NRC) staff and to support a conference call (if needed) with Exelon in order to clarify the licensees relief requests regarding the third interval inservice inspection program. The draft RAI is related to the licensees submittal dated February 10, 2011. The draft questions were sent to ensure that they were understandable, the regulatory basis was clear, and to determine if the information was previously docketed.

Additionally, review of the draft RAI would allow Exelon to evaluate and agree upon a schedule to respond to the RAI. This memorandum and the attachment do not represent an NRC staff position.

Docket Nos. 50-289

Enclosure:

As stated DISTRIBUTION:

Public RidsNrrPMPBamford LPL1-2 R/F Accession No.: ML111990096

• via email OFFICE LPL1-2/PM CPNB/BC CVIB/BC NAME PBamford TLupold* MMitchell*

DATE 7/20/2011 07/13/2011 07/11/2011 OFFICIAL RECORD COPY

DRAFT 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 Exelons 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