ML20062A087

/03L-0 on 780916:Surveillance Tests on Barton Model 289 Pressure Indicating Switches Showed Changes in Setpoints Due to Instru Drift.Rev Surveillance Test Scheds Now Adequate to Ensure Early Detection of Drifts

ML20062A087
Person / Time
Site:	Nine Mile Point
Issue date:	09/29/1978
From:	NIAGARA MOHAWK POWER CORP.
To:
Shared Package
ML17053A187	List: ML20062A087
References
LER-78-033-03L, LER-78-33, LER-78-33-3L, NUDOCS 7810100059
Download: ML20062A087 (1)

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? 8 60 68 QQCKET NUMBER 68 63 EVENT O ATE 74 75 REPORT OATE 80 EVENT DESCRIPTloN AND PRoBA8LE CONSEQUENCES h l o 121 l During normal operation, performance of Surveillance Test N1 TSP RFOd. l Io lai i found RE04A, RE04B. RE0dC and RE04D with se,tpointsmore conservative  !

10141 I than allowed by T.S. 3.6.2. This condition does not create an unre- 1 io isi i viewed safety question, and has minimal safety implications. I lo is i l i 10171 I l I o !a l I -

CoEE #*'o*ECo ' sLsCi$E CoMPCNENT CODE 5 SCODE S E 1o191 7 8 I Il Bl@ l E l@ [E_J@ II lN lS lT lR lU l@ l Sl@ l Zl@

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@ 4Eg l21718l 22 l--l 23 1013l3l 24 26 l/l 27 l 0l 3l 28 29 lLl 30 l_l 31 l8 l 32 iK N AC o ON PL NT ME HOUR $ 22 S8 i POR 8. $U (16 VAN PACTURER lEl@ W@ lZl@ lZi@ l0 l0 l0 l l l N] g l Y] g lN l g l Bl 0l 8l 0l g 33 34 35 36 31 40 44 43 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h litoll The high drywell pressure switches involved are Barton Model 289 Pres- I mi sure Indicating Switches. The changes in setpoint experienced were due I i,i,ii to instrument drift. RE04A and C were reset to 3.45 PSIG, and RE048 3 J

i,i3i l and D to 3.50 PSIG. Current surveillance testing schedules are ade- I ii i4 i l quate to insure early detection of future instrument drifts. I 7 8 9 SO 5A *.POWER OTHE R $7ATUS I O R CISCOVERY DESCRIPTICN IiIellEl@ l0l9l0l@l NA l l B l@l Surveillance Testing l ACTIViry CO TENT RELEASED CP RELEASE AMOUNT CF ACTIVITY Ii l 6 l l Zl @ l 2 l@l NA _j l NA LOCATION OF RELEASE l

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