DCL-87-027, Special Rept 87-01:on 870126,plant Action Request Initiated After Intermittent Sys Failure Alarms Received on Train B of Reactor Vessel Level Indication Sys (Rvlis).Cause Under Investigation.Effort to Restore Train B of RVLIS Continuing

Special Rept 87-01:on 870126,plant Action Request Initiated After Intermittent Sys Failure Alarms Received on Train B of Reactor Vessel Level Indication Sys (Rvlis).Cause Under Investigation.Effort to Restore Train B of RVLIS Continuing

ML20210V607
Person / Time
Site:	Diablo Canyon
Issue date:	02/13/1987
From:	Shiffer J PACIFIC GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
87-01, 87-1, DCL-87-027, DCL-87-27, NUDOCS 8702190065
Download: ML20210V607 (2)

Text

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E LE C T RI C C O M PANY PACIP'IC lOAS AND IPGME j 77 BEALE STREET . SAN FRANCISCO, C ALIFORNIA 94106 * (415) 781-4211 . TWX 910-3 72-6587 JAMES D. SHIFFE R nunua wen raanow ,

j February 13, 1987 PGandE Letter No.: DCL-87-027 Nuclear Regulatory Commission ATTN: Docur.ent Control Desk Hashington D.C. 20555 Re: Docket No. 50-323, OL-DPR-82 Diabic Canyon Unit 2 SR 87-01, Special Report on Inoperability of One Channel of the Reactor Vessel Level Indication System Gentlemen:

In accordance with the requirements of the Diablo Canyon Power Plant (DCPP)

Technical Specifications 6.9.2 and 3.3.3.6 Action e., this Special Report is being submitted concerning the operability of one channel of the Unit 2 reactor vessel level indication system (RVLIS) and the feasability of repair during plant operation.

On January 26, 1987, a plant action request was initiated after several intermittent system failure alarms were received on train 8 of the DCPP Unit 2 RVLIS. A work order was initiated and an investigation started by the Instrumentation and Controls group to determine the cause of the failure alarms. The system problems were intermittent, and efforts to determine the exact cause of the inoperability were inconclusive. Therefore, on February 1, 1987, repairs to train B of the RVLIS were determined not to be feasible without further investigation and assistance.

Westinghouse is providing vendor technical assistance with the continuing troubleshooting efforts. A revision to this Special Report will be submitted after the cause of failure and the necessary repairs have been determined.

0$l$ o nn, 0$Q 8[0

. < ' * ~' Document Control Desk PGandE Letter No.: DCL-87-027 February 13, 1987 Page 2 PGandE plans to continue its effort to restore train B of the RVLIS to an operable status in an expeditious manner.

Kindly acknowledge receipt of this material on the enclosed copy of this letter and return it in the enclosed addressed envelope.

Sincerely,

. fe cc: L. J. Chandler '

J. B. Martin M. M. Mendonca P. P. Narbut B. Norton H. E. Schierling CPUC Diablo Distribution 1288S/0048K/DJH/1361 i

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