ML102250387
| ML102250387 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 08/16/2010 |
| From: | Bo Pham License Renewal Projects Branch 1 |
| To: | O'Grady B Nebraska Public Power District (NPPD) |
| Tran T, NRR/DLR, 415-3617 | |
| References | |
| Download: ML102250387 (5) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 August 16, 2010 Mr. Brian O'Grady Vice President Nuclear and Chief Nuclear Officer Cooper Nuclear Station 72676-648A Avenue Brownville, NE 68321
SUBJECT:
COMPLETION OF COOPER NUCLEAR STATION LICENSE RENEWAL REVIEW
Dear Mr. O'Grady:
This letter is to inform you of a change in the Cooper Nuclear Station (CNS) license renewal review schedule.
The CNS Safety Evaluation Report (SER) with open item was issued on April 6, 2010. The final SER was scheduled to be issued on July 29,2010. However, additional time was required to resolve issues associated with the open item for the buried piping aging management program.
In addition, the staff also held a conference call with members of your staff on August 12, 2010, to inform them of a late-breaking request for additional information (RAI) regarding the aging management of in-scope inaccessible low voltage cable at CNS. Enclosed is the RAI associated with that discussion.
As stated during the conference call, the staff will strive to reach resolution on the low voltage cable issue and publish the final SER no later than September 7,2010. However, if we are unable to resolve the matter during the course of this review, you will be promptly notified of further impacts to the review schedule.
Items in this letter were discussed with Mr. William Victor. If you have any questions, please contact Tam Tran of my staff at 301-415-3617 or bye-mail at tam.tran@nrc.gov.
Bo Pham, Chief Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-298
Enclosure:
As stated cc w/encl: Distribution via Listserv
COOPER NUCLEAR STATION LICENSE RENEWAL REQUEST FOR ADDITIONAL INFORMATION RAI 8.1.25-2
Background:
NUREG-1801, Rev. 1, "Generic Aging Lessons Learned," (the GALL Report) addresses inaccessible medium voltage cables in aging management program (AMP) XI.E3, "Inaccessible Medium Voltage Cables Not Subject to 10 CFR 50.49 Environmental Qualification Requirements." The purpose of this program is to provide reasonable assurance that the intended functions of inaccessible medium voltage cables (2 kV to 35 kV), that are not subject to environmental qualification requirements of 10 CFR 50.49 and are exposed to adverse localized environments caused by moisture while energized, will be maintained consistent with the current licensing basis. The scope of the program applies to inaccessible (in conduits, cable trenches, cable troughs, duct banks, underground vaults or direct buried installations) medium voltage cables within the scope of license renewal that are subject to significant moisture simultaneously with significant voltage.
The application of AMP XI.E3 to medium voltage cables was based on the operating experience (OE) available at the time Revision 1 of the GALL Report was developed. However, recently identified industry OE indicates that the presence of water or moisture can be a contributing factor in inaccessible power cables failures at lower service voltages (480 V to 2 kV).
Applicable OE was identified in licensee responses to Generic Letter 2007-01, "Inaccessible or Underground Power Cable Failures that Disable Accident Mitigation Systems or Cause Plant Transients," which included failures of power cable operating at service voltages of less than 2 kV where water was considered a contributing factor. The staff has proposed changes to be included in the next revision of the GALL Report AMP XI.E3 to address recently identified OE concerning the failure of inaccessible low voltage power cables, which includes general water intrusion as a failure mechanism and increases the scope of program to include power cables greater than or equal to 480 V.
Issue:
The staff has concluded, based on recently identified industry OE concerning the failure of inaccessible low voltage power cables (480 V to 2 kV) in the presence of significant moisture, that these cables should be included in an AMP. The staff notes that your AMP does not address these low voltage cables.
Request:
- 1. Provide a summary of the evaluation of recently identified industry OE and any plant-specific OE concerning inaccessible low voltage power cable failures within the scope of license renewal (not subject to 10 CFR 50.49 environmental qualification requirements), and how this OE applies to the need for additional aging management activities by the applicant for such cables.
ENCLOSURE
- 2
- 2. Provide a discussion of how Cooper Nuclear Station will manage the effects of aging on inaccessible low voltage power cables within the scope of license renewal and subject to aging management review; with consideration of recently identified industry OE and relevant plant-specific OE. The discussion should include assessment of your AMP description, program elements (Le., Scope of Program, Parameters Monitored/Inspected, Detection of Aging Effects, and Corrective Actions), and Final Safety Analysis Report summary description to demonstrate reasonable assurance that the intended functions of inaccessible low voltage power cables subject to adverse localized environments will be maintained consistent with the current licensing basis through the period of extended operation.
August 16, 2010 Mr. Brian O'Grady Vice President Nuclear and Chief Nuclear Officer Cooper Nuclear Station 72676-648A Avenue Brownville, NE 68321
SUBJECT:
COMPLETION OF COOPER NUCLEAR STATION LICENSE RENEWAL REVIEW
Dear Mr. O'Grady:
This letter is to inform you of a change in the Cooper Nuclear Station (CNS) license renewal review schedule.
The CNS Safety Evaluation Report (SER) with open item was issued on April 6, 2010. The final SER was scheduled to be issued on July 29,2010. However, additional time was required to resolve issues associated with the open item for the buried piping aging management program.
In addition, the staff also held a conference call with members of your staff on August 12,2010, to inform them of a late-breaking request for additional information (RAI) regarding the aging management of in-scope inaccessible low voltage cable at CNS. Enclosed is the RAI associated with that discussion.
As stated during the conference call, the staff will strive to reach resolution on the low voltage cable issue and publish the final SER no later than September 7,2010. However, if we are unable to resolve the matter during the course of this review, you will be promptly notified of further impacts to the review schedule.
Items in this letter were discussed with Mr. William Victor. If you have any questions, please contact Tam Tran of my staff at 301-415-3617 or bye-mail at tam.tran@nrc.gov.
Sincerely, IRA!
Bo Pham, Chief Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-298
Enclosure:
As stated cc w/encl: Distribution via Listserv DISTRIBUTION: See next page Accession No.: ML102250387 OFFICE PM:RPB1 :DLR LA:DLR
' BC:RPB1:DLR NAME TTran YEdmonds BPham DATE
. 08/16/10 08/16/10 I 08/16/10 OFFICIAL RECORD COpy
Letter to B. O'Grady from B. Pham dated August 16, 2010
SUBJECT:
COMPLETION OF COOPER NUCLEAR STATION LICENSE RENEWAL REVIEW DISTRIBUTION:
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