ML19340D799

Revised LER 80-064/03X-1:on 800810,high Containment Pressure Trip Received from PPS a & D.On 801203,steam Generator B Low Level Trip Circuit for PPS a Was Inoperable.Caused by Bistable Comparator Card Power Supply Failures

ML19340D799
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/26/1980
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19340D796	List: ML19340D795 ML19340D799
References
LER-80-064-03X, LER-80-64-3X, NUDOCS 8101050387
Download: ML19340D799 (1)

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[ REVISED REPORT - PREVIOUS REPORT DATE 09/08/80 i NRC F ORM 366 U. S NUCLE AR REOUL ATORY COMMISSION LICENSEE EVENT REPORT EXHIBIT A (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI CONTROL BLOCK. l l l 1 I l lh lo lil l Aj R l A [ Nj 0 s.l 2lgl 0 l0 l - l0 l 0 l 0l Oj 0 l- l 0 l0 lg64l1tutl 1 l1 l 1biCAr lggsal lg 7 8 9 L,CENsEE COD 6 M L6CE ~st Nvvet u 26 26 tset J0 CON'T lolil ."E "J LL_l@l0 ! 5 p 10 l 01316181@l 69 01811101810 l@lPi1121216 HF,OM f Dait I 81060l@

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EVENT DESCRIPTION ANQ *ROS AOLE CONSEQUENCES h t o 121 i During Mode 1 operation, a hiah containment pressure trip was received oni Ic12118/10/80 from PPS "A". Later the same day. a similar trio was received ont ic i. i i PPS "D" from theJteam Generator "B" Low pressure circuit. On 12/3/80. I lo isi Ldurina a surveillance test it was identified that the Steam Generator "B"I lo is i i low level trio circuit for PPS "A" was inocerable. In every case. the I lo is i i rema.ning channels remained operable with a 2 out of 3 reactor trip logic!

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, .. .i CAUSE DESCR.PTION AND CORRECflVE ACTIONS liioi IInvestication revealed that the 8/10/80 occurrences were due to bistable i i, li i i comoarator card power sucolv failures. The 12/3/80 occurrence was related m I to a bistable comparator card logic failure. Channels were repaired & i i,13i I declared operable meetina requirements of T.S. Table 3.3-1 Action 2a. 1 i i i. i I Failure investigation has been referred to the supplier / manufacturer to i

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