ML20028E242

LER 82-056/03L-0:on 821218,rod Block Setpoint of 12.2% Found on APRM 6.Caused by Setpoint Drift.Aprm 6 Bypassed While Rod Block Setpoint Readjusted

ML20028E242
Person / Time
Site:	Dresden
Issue date:	01/12/1983
From:	Beverly K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028E241	List: ML20028E240 ML20028E242
References
LER-82-056-03L, LER-82-56-3L, NUDOCS 8301210119
Download: ML20028E242 (1)

Text

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7 8 el occKET NUMSSR GS te - L c CNT oATg 74 7s aEPoRT oATE to EVENT DESCRIPTION ANO PROSA8LE CONSEQUENCES h l o I 21 l While in refuel mode durine DOS 500-3, a rod block setpoint of 12.2 percent was l

ITTTI I found on APRM 6 (Tech. Spec. 2.1.B). Safety significance was minimal because APRM 6 l l o i A I I was hvnassed and Channel A and APRM'1 4 and 5 were operable. There was no effect on ( ,

l o i s i l oublic health or safety. Last oceurrence involving setpoint drift reported on i 1 o is 1 I p.n. Al-76/O'4L Dncket 50-?'7

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47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS 27 I i 101 lThe cause is attributed to setpoint drift. APRM 6 was bypassed while I.M. readjustedt 1i li l lthe rod block setnoint. The rod block and scram setpoints were tested successfullv. I g iInstrument Surveillance, DIS 700-5. will be performed during the present outage and i I i I 3 I l Oneratine Surveillance. DOS 500-3. will continue as reauired. I l i 14 l l l 7 s e so A %PoWGR oTHER status oi o EM oisCOVERv ossemiPTION l t 15 l Wh 10 l 0 l 0 Ihl N /A l [f,jhl Surveillance Test l 7

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