L-PI-15-071, Cancellation of License Event Report (LER)50-282/2015-001-00, 14 Fan Coil Unit Leak

Cancellation of License Event Report (LER)50-282/2015-001-00, 14 Fan Coil Unit Leak

ML15247A355
Person / Time
Site:	Prairie Island
Issue date:	09/03/2015
From:	Davison K Northern States Power Co, Xcel Energy
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-PI-15-071 LER 15-001-00
Download: ML15247A355 (2)

Text

(l Xcel Energy" SEP .0 3 2015 L-PI-15-071 10 CFR 50.73 U S Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Prairie Island Nuclear Generating Plant Unit 1 Docket 50-282 Renewed License No. DPR-42 Cancellation of Licensee Event Report (LER) 50-282/2015-001-00. 14 Fan Coil Unit Leak

Reference:

1. Northern States Power Company, a Minnesota corporation, doing business as Xcel Energy (hereafter "NSPM") letter to NRC, "LER 50-282/2015-001-00, 14 Fan Coil Unit Leak. (ADAMS Accession ML15016A204)

This letter constitutes notification to the NRC of the cancellation of Prairie Island Nuclear Generating Plant (PINGP) LER 50-282/2015-001-00 (Reference 1). The cancellation is consistent with the guidance in NUREG-1022, Rev 3, "Event Reporting Guidelines 10 CFR 50.72 and 50.73."

This event was originally considered reportable under 10 CFR 50.73(a)(2)(v)(C), any event or condition that could have prevented the fulfillment of a safety function to control the release of radioactive material.

As discussed in the referenced LER, the Unit 1 Containment was declared inoperable for a loss of Containment integrity on November 20, 2014, due to a leak on t,he Fan Coil Unit (FCU). The leak caused a breach to the Containment boundary and a loss of a fission product barrier that could have resulted in a radioactive release from the Containment into the Cooling Water system, and resulting in off-site dose to the public during a Design Basis Accident (DBA).

In the final engineering evaluation, the predicted containment leakage past the Auxiliary Building Special Ventilation Zone (ABSVZ) and Shield Building was less than the available containment leakage margin for these same paths. The safety function to control the release of radioactive material was not lost during the FCU leakage. Based on the determination that no loss of safety function existed, NSPM is cancelling LER 50-282/2015-001-00.

1717 Wakonade Drive East

• Welch, Minnesota 55089-9642 Telephone: 651.388.1121

Document Control Desk Page 2 Summary of Commitments This letter contains no new commitments and no changes to existing commitments.

Kevin Davison Site Vice President, Prairie Island Nuclear Generating Plant Northern States Power Company- Minnesota cc: Administrator, Region Ill, USNRC Project Manager, Prairie Island, USNRC Resident Inspector, Prairie Island, USNRC Department of Commerce, State of Minnesota