1CAN121101, Generic Letter 2004-02 Refueling Outage Information

Generic Letter 2004-02 Refueling Outage Information

ML120040124
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/21/2011
From:	Pyle S Entergy Operations
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
1CAN121101, GL-04-002
Download: ML120040124 (4)

Text

Entergy Operations, Inc.

1448 S.R. 333 Russellville, AR 72802 Tel 479-858-4704 Stephenie L. Pyle Manager, Licensing Arkansas Nuclear One 1CAN121101 December 21, 2011 U.S. Nuclear Regulatory Commission Attn: Document Control Desk 11555 Rockville Pike Rockville, MD 20852

SUBJECT:

Generic Letter 2004-02 Refueling Outage Information Arkansas Nuclear One - Unit 1 Docket No. 50-313 License No. DPR-51

Reference:

1. Entergy letter to NRC, Generic Letter 2004-02 Revision to the Final Supplemental Response and Requests for Additional Information, dated September 29, 2010 (0CAN091001)

Dear Sir or Madam:

By letter dated September 29, 2010 (Reference 1), a revision to the final supplemental response to Generic Letter 2004-02 was provided. During the recent Arkansas Nuclear One, Unit 1 (ANO-1) refueling outage (1R23), insulation discrepancies were noted in which previously unidentified insulation was discovered. The purpose of this submittal is to inform the NRC of these discrepancies.

The following insulation discrepancies were noted during reactor building walkdowns in 1R23 and are being addressed under the corrective action program:

Metal encapsulated fibrous insulation (MEI) was discovered on top of the ANO-1 pressurizer. The MEI was not previously identified in Reference 1, Attachment 1, Revised Table 3.b.2-1 as a potential debris source; rather this pressurizer insulation was characterized as reflective metal insulation. An acceptable operability evaluation has been performed as part of the corrective action process. The MEI was determined to be outside of the 4D zone-of-influence based on MEI testing from another Entergy facility.

1CAN121101 Page 2 of 2 Temp-Mat fibrous insulation was discovered between the pressurizer and its restraint/support beams. An acceptable operability evaluation for the current operating cycle has been performed as part of the corrective action process. Plans for long-term resolution beyond the current operating cycle are being addressed under the corrective action program. Entergy will inform the NRC of the final plans for disposition by March 24, 2013.

Temp-Mat fibrous insulation was also discovered in metal enclosures around the eight support lugs on the pressurizer. This insulation was removed from the reactor building prior to start-up from 1R23.

This fibrous insulation was discovered as part of walkdowns to identify undocumented insulation based upon industry operating experience. Additional inspections are planned in the upcoming refueling outages for both of the ANO units to provide confidence that additional undocumented fibrous insulation is not installed. This action is being tracked in the corrective action system.

The new commitment contained in this submittal is summarized in the attachment. If you need any additional information, please contact me.

Sincerely, Original signed by Stephenie L. Pyle SLP/nbm

Attachment:

List of Regulatory Commitments cc: Mr. Elmo Collins Regional Administrator U. S. Nuclear Regulatory Commission, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 NRC Senior Resident Inspector Arkansas Nuclear One P.O. Box 310 London, AR 72847 U. S. Nuclear Regulatory Commission Attn: Mr. Kaly Kalyanam MS O-8 B1 One White Flint North 11555 Rockville Pike Rockville, MD 20852

Attachment to 1CAN121101 List of Regulatory Commitments

Attachment to 1CAN121101 Page 1 of 1 List of Regulatory Commitments The following table identifies those actions committed to by Entergy in this document. Any other statements in this submittal are provided for information purposes and are not considered to be regulatory commitments.

TYPE SCHEDULED (Check One) COMPLETION COMMITMENT DATE ONE-TIME CONTINUING (If Required)

ACTION COMPLIANCE Entergy will inform the NRC of the final X March 24, 2013 plans for disposition.