ML20010A585

LER 81-044/03L-0:on 810703,average Power Range Monitor 6 Failed to Initiate Rod Block During Normal Operation.Caused by Failure of K-2 Relay Which Prevented Proper Operation of Relay K5.Monitor Bypassed & Relay Replaced

ML20010A585
Person / Time
Site:	Dresden
Issue date:	07/30/1981
From:	Holland P COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20010A580	List: ML20010A579 ML20010A585
References
LER-81-044-03L, LER-81-44-3L, NUDOCS 8108110575
Download: ML20010A585 (2)

Text

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CONTROL SLOCK: l l l l l  !

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l0ltI 7 4 60 68 69 74 80 61 ooCKET NuMSER EVENT oATE 75 R EPoRT oATE EVENT DESCRIPTION AND PR08A8LE CONSEQUENCES Oio I o 12 l l During normal operation with DOS 500-T in progress, APRM 6 failed to initiate a rod l g ; block (T.S. Section 2.1.B). This was of minimal safety significance since Channel A g po q g and the two remaining instruments on Channel B were operable. There was no effect on g g p ,public health or safety. Previous occurrences R.O. 50-237/77-5 and R.O. 50-249/80-32.  ;

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l1 lol IThe cause was a failure of the K-2 relav, General Electric Catalog number 175A9003P013. l IiiiI iwhich prevented proper operation of relay K5. APPM 6 was bypassed and the relar re- I g lplaced. The instrument was satisfactorily tested, and returned to service. DIS 700-6 l g , p 3 g l trill continue to be performed mo'nthly. l l i 141 I I a a so

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) DEVIATION REPORT - <

DVR NO.

Commonwealth Ed.ison STA UNsf YEAR N O.

D 2 74 PART Il Tl TLE OF DEVI ATION OCCU RRED 7/3/81 0625 No APRM HI Rod Block CH. 6 DATE TWE SYSTEM AFFECTED 700 PLANT CONDITIONS TES1tNG Neutron Monitoring yg g, Run p,, , M,7)

M71 ', LOAD (MWE) 448 YES DESCRIPTION OF EVENT Feiled to get Rod Block on APRM HI Ch. 6 during Rod Block / Scram Functional Test.

DESCRIPTION OF CAUSE Unknown

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D~THER APPLICABLE INFORMATiON Channel 6 put in bypass EQUIPMENT C YES DR i40. WR NO.

J. Kotowski 7/3/81 FAILU RE NO 1429 RESPONSIBLE SUPERVISOR DATE PART 2 l OPERATING ENGINEERS COMMENTS

• APRM CH. 6 placed in bypass. Remaicing APRMS demonstrated operable immediately.

SAFETY-TYPE OF DEVIATION EVENT OF PCTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE GCCURRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPORTING WR ISSUED 14 DAY 10CFR21 YES YES X 23 DAY $0T ^T' " NO NO

,6 '. . .a REPORTARLE CCCURRENCE ACTION ITEM NC. PROMPT ON-SITE NOTIFICATION i NUMBER C. E. Sargent 7/7/81 1700 T4TL DATE TIME X50t 81-44/03h-0 TI TLE CATE TIME 24-HOUR NRC NOTIFICATION PROMPT OFF-SITE NOTIFICATION TPH N/A C. A. Palmer 7/8/81 0906 REGION lil CATE TIME TITLE DATE TIME TGM N/A REGION lil & COL CATE TIME TI TLE DATE TIME RESPONSI SLE CCYP ANY OFFI CER I N FO RMED O F iOCFR21 CONDIT!CNS AND THEIR DEPO AT TO N PC

• TITLE DATE i a M t.

REVI EW AND COMPLETED . John Wuiciga 7/6/81 OPERATING ENGINEER DATE A .

ACCEPTANCE BY STATION REVIEW AS REGUIRED Q

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DATE 7 I 3I U I RESOLUTION APPROVED AND 5 amA _M _ 7!3l!9l '

AUTHORIZED FOR DISTRIBUTION STATION SURER I N Ts/4 DENT DA,TE .

30 3'7' to 77 (FCRM IS*S2-9)

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