05000260/LER-2016-002, Regarding High Pressure Coolant Injection System Failure Due to Stuck Contactor

Regarding High Pressure Coolant Injection System Failure Due to Stuck Contactor

ML16257A506
Person / Time
Site:	Browns Ferry
Issue date:	09/13/2016
From:	Bono S Tennessee Valley Authority
To:	Document Control Desk, Office of New Reactors
References
LER 16-002-00
Download: ML16257A506 (8)

LER-2016-002, Regarding High Pressure Coolant Injection System Failure Due to Stuck Contactor

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(v), Loss of Safety Function
LER closed by
IR 05000259/2016000 (9 November 2016) IR 05000259/2016003 (9 November 2016)
2602016002R00 - NRC Website

text

Tennessee Valley Authority, Post Office Box 2000, Decatur, Alabama 35609-2000 September 13, 2016 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Subject:

Browns Ferry Nuclear Plant, Unit 2 Renewed Facility Operating License No. DPR-52 NRC Docket No. 50-260 Licensee Event Report 50-260/2016-002-00 10 CFR 50.73 The enclosed Licensee Event Report provides details of the inoperability of the Browns Ferry Nuclear Plant, Unit 2, High Pressure Coolant Injection system. The Tennessee Valley Authority (TVA) is submitting this report in accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.73(a)(2)(v)(D), as any event or condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.

There are no new regulatory commitments contained in this letter. Should you have any questions concerning this submittal, please contact J. L. Paul, Nuclear Site Licensing Manager, at (256) 729-2636.

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S. M. Bono Site Vice President Enclosure: Licensee Event Report 50-260/2016-002 High Pressure Coolant Injection System Failure Due To Stuck Contactor cc (w/ Enclosure):

NRC Regional Administrator - Region II NRC Senior Resident Inspector - Browns Ferry Nuclear Plant

ENCLOSURE Browns Ferry Nuclear Plant Unit 2 Licensee Event Report 50-260/2016-002-00 High Pressure Coolant Injection System Failure Due To Stuck Contactor See Enclosed VII. Additional Information:

A. Previous Similar Events

A review of the BFN CAP and Licensee Event Reports (LERs) for Units 1, 2, and 3 revealed no contactor failures resulting in the inoperability of BFN HPCI systems for the last three years.

B. Additional Information

There is no additional information.

C. Safety System Functional Failure Consideration:

The failed contactor was not part of the planned maintenance being performed during the scheduled LCO. Due to the additional, unplanned inoperability of the HPCI system resulting from the failed contactor, this system was unable to perform its safety function while in a mode of applicability for HPCI.

This event resulted in the inability of the BFN, Unit 2, HPCI system to perform its safety function for mitigation of the consequences of an accident. In accordance with NUREG-1022, this event is considered a safety system functional failure.

D. Scram with Complications Consideration:

This event did not result in a reactor scram.

VIII. COMMITMENTS

There are no new commitments.