L-07-001, Supplement to Response to NRC Generic Letter 2007-01: Lnaccessible or Underqround Power Cable Failures That Disable Accident Mitigation Systems or Cause Plant Transients
| ML102110104 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 07/29/2010 |
| From: | Schimmel M Northern States Power Co, Xcel Energy |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GL-07-001, L-PI-10-078, TAC MD4367, TAC MD4368 | |
| Download: ML102110104 (2) | |
Text
JUL 2 9 2010 L-PI-10-078 10 CFR 50.54(f)
U S Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Prairie Island Nuclear Generating Plant Units 1 and 2 Dockets 50-282 and 50-306 License Nos. DPR-42 and DPR-60 Supplement to Response to NRC Generic Letter 2007-01: lnaccessible or Underqround Power Cable Failures that Disable Accident Mitigation Systems or Cause Plant Transients (TAC Nos. MD4367 and MD4368)
References:
- 1.
Letter from Nuclear Management Company, LLC (NMC) to NRC "Response to NRC Generic Letter 2007-01: Inaccessible or Underground Power Cable Failures that Disable Accident Mitigation Systems or Cause Plant Transients", dated May 8, 2007, ADAMS Accession Number ML071290142.
In reference 1, NMC' submitted the required response to Generic Letter (GL) 2007-01 for the Prairie Island Nuclear Generating Plant (PINGP), Units 1 and 2. In recent reviews of this response, two issues were identified for which supplemental informat~on is provided:
- 1. GL 2007-01 requested "a history of inaccessible or underground power cable failures". The NMC response included Cable 24402-2 for the 22 Circulating Water Pump as a cable that failed. In actuality, the cable continuously provided service and did not fail. However, a defect was identified during maintenance testing whrch was repaired to preclude failure.
- 2. The response stated, "At PINGP, power cables are routinely tested under preventive maintenance procedures for their loads." As of the date of Reference '
PINGP staff was not routinely testing bus feeder cables, including cables that supply offsite power sources to the 4 kV safeguards buses and the motor contra
- On September 22, 2008, NMC transferred its operating authority to Northern States Power Company, a Minnesota corporation (NSPM), doing business as Xcel Energy. By letter datec September 3, 2008, NSPM assumed responsibility for actions and commitments previouslv submitted by NMC.
1717 Wakonade Drive East Welch, Minnesota 55089-9642 Telephone: 651.388.1 121
Document Control Desk Page 2 centers (MCCs 1AB1 and 1AB2) which supply control power to safety related equipment.
If there are any questions or if additional information is needed, please contact Mr. Dale Vincent, P.E., at 651-388-1 121.
Summarv of Commitments This letter contains no new commitments and no revisions to existing commitments I declare under penalty of perjury that the foregoing is true and correct.
Mark A. Schimmel Site Vice President, Prairie Island Nuclear Generating Plant Northern States Power Company - Minnesota cc:
Administrator, Region Ill, USNRC Project Manager, PINGP, USNRC Resident Inspector, PINGP, USNRC