05000368/LER-1980-064-03, /03L-0:on 800810,during Mode 1 Operation,Plant Protective Sys Channels a & D Malfunctioned.Caused by Power Supply Failure.Channels Repaired & Declared Operable Per Tech Specs

/03L-0:on 800810,during Mode 1 Operation,Plant Protective Sys Channels a & D Malfunctioned.Caused by Power Supply Failure.Channels Repaired & Declared Operable Per Tech Specs

ML19344F464
Person / Time
Site:	Arkansas Nuclear
Issue date:	09/08/1980
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19344F460	List:
References
LER-80-064-03L, LER-80-64-3L, NUDOCS 8009150296
Download: ML19344F464 (1)

LER-1980-064, /03L-0:on 800810,during Mode 1 Operation,Plant Protective Sys Channels a & D Malfunctioned.Caused by Power Supply Failure.Channels Repaired & Declared Operable Per Tech Specs

Event date:
Report date:
3681980064R03 - NRC Website

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NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION 17 771 LICENSEE EVENT REPORT EXHIBIT A CONTROL 8LOCec: l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATIONI

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DOCEET hum 8ER 68 63 EVENT DATE 75 HF, ORT DArE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Oio 1o: 211 During Mode 1 operation, a high containment pressure trip was received oni e i PPS Channel "A".

The remainina channels remained operable with the i

io u iireactor trip logic in a 2 out of 3 trip logic.

Later the same day, a l

ITTTI I similar trip signal was received on PPS Channel "D" from the Steam i

ic a i i Generator "B" low pressure circuit.

The remaining channels remained i

f o l > l Looerable.

Similar to LER's 50-368/79-055,80-028 & 80-033.

Reportable t

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A CAUSE DESCR.PTION AND CORRECrivE ACTIONS t i lo i l lnvestication revealed the PPS "A" failure was cue to a power supply

~ t m ifailure on bistable comparator card #13.

The PPS "D" failure was due i

i,i,i i to a power supply failure on bistable comparator card #12.

Channels i

i,13 twere repaired and declared operable meeting requirements of T.S. Table i,nii 3.3-1 Action Statement 2a.

Failure inve.stigation has '.2een referred to iga,nufacturer and. a proposea coolgca,t,1,on.1s being preparea.

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