ML20059K988

Confirmatory Action Ltr CAL 1-93-20 Re Decision to Dispatch AIT to Review Circumstances & Evaluate Safety Significance of Recent Failures of EDG Load Sequencers at Plant.Nrc Understands That Listed Actions Will Be Taken

ML20059K988
Person / Time
Site:	Beaver Valley
Issue date:	11/09/1993
From:	Martin T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:	Sieber J DUQUESNE LIGHT CO.
References
CAL-1-93-20, NUDOCS 9311160261
Download: ML20059K988 (4)

Text

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ifr NOV 911993 Docket No. 50-412

-License No. NPF-73 CAL No.1-93-020 Mr. J. D. Sieber 5

Senior Vice President Nuclear Power Division Duquesne Light Company Post Office Box 4 Shippingport, Pennsylvania 15077

SUBJECT:

CONFIRMATORY ACTION LETTER l-93-020 l

c On November 8,1993, in a telephone discussion, Wayne Hodges, Director, Division of Reactor Safety, informed Thomas P. Noonan, General Manager, Nuclear Engineering and Safety, of our,

decision to dispatch an Augmented Inspection Team (AIT) to review the circumstances and--

evaluate the safety significance of the recent failures of the emergency diesel generator load sequencers at Beaver Valley Power Station Unit 2. Both the No. I and No. 2 emergency diesel generators failed the auto-load surveillance test on. November 4,1993, and November 6,1993, respectively. The test failed when loads did not sequence on the emergency bus during a simulated loss of offsite power with a safety injection signal. The A.T was initiated because of the comm.on-mode failure identified in the emergency diesel generator system, the possiNe generic implications that may exist for the design and operation of the relays used in the sequencer circuit, and the need to fully understand the root cause(s) of these failures. The. AIT, led by James Trapp of our office, is expected to commence their activities at the Beaver Valley Power Station on November 9,1993.

Pursuant to the telephone conference between Mr. Hodges and Mr. Noonan, it is our understanding that you are taking the following actions:

L Quarantine and suspend testing of relays and components, which may have caused the failure of the emergency diesel generator load. sequencers, until resumption is authorized by Mr. Trapp, alt Team Leader.

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Maintain Unit 2 in the Cold Shutdown Mode until you receive authorization from the.

Regional Administrator, NRC Region 1.

I 9311160261 931109

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i NOV 9 1993 Mr. J. D. Sieber 2

Pursuant to Secdon 182 of the Atomic Energy Act,42 U.S.C. 2232, and 10 CFR 2.204, you are hereby required to:

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Notify me immediately if your understanding differs from that set forth above.

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2.

Notify me, if for any reason, you require modification of any of these agreements.

'ssuance of this Con 6rmatory Action Letter does not preclude issuance of an Order formahzmg the above commitments or requiring other actions on the part of the licensee, nor does it i

i preclude the NRC from taking enforcement action if violations of NRC regulatory requirements are identified through the actions of the AIT. In addition, failure to take the actions addressed in the Confirmatory Action Letter may result in enforcement action.

In accordance with 10 CFR 2.790 of the NRC's " Rules of Practice," a copy of this letter will

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be placed in the NRC Public Document Room. We appreciate your cooperation in this matter.

l Sincerely, OR!GINAL SIGNED BY*-

Thomas T. Martin I

. Regional Administrator cc:

G. S. Thomas, Vice President, Nuclear Services D. E. Spoerry, Vice President, Nuclear Operations L. R. Freeland, General Manager, Nuclear Operations Unit K. D. Grada, Manager, Quality Services Unit N. R. Tonet, Manager, Nuclear Safety Department H. R. Caldwell, General Superintendent, Nuclear Operations Public Document Room (PDR)

Local Public Document Room (LPDR)

Nuclear Safety Information Center (NSIC)

K. Abraham, PAO (2 copies)

NRC Resident inspector Commonwealth of Pennsylvania State of Ohio OFFICIAL RECORD COPY

. p NOV' 9 1993 Mr. J. D. Sieber 3

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