ML20009H617

LER 81-030/03L-0:on 810630,all Emergency Condenser Vent Monitors Exceeded Upscale Trip Setpoint During Calibr. Caused by Difference in Response Between Test Signal & Actual Signal.Procedure Revised

ML20009H617
Person / Time
Site:	Nine Mile Point
Issue date:	07/30/1981
From:	Neild R NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009H612	List: ML20009H611 ML20009H617
References
LER-81-030-03L, LER-81-30-3L, NUDOCS 8108100297
Download: ML20009H617 (2)

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NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION

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I 8 60 61 DOCKET NUMBER 68 69 EVENT O ATE le 75 REPORT DATE EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES Oto lo l2l l During a refueling outage, while performed routine calibration of the Emergency  ;

ioi3i l Condenser Vent Monitors, Procedure N1-RTP-20, all four monitors exceeded the  ;

[o l4 l l upscale trip set point of 15 mr/hr. Three of the monitors (#111, 112, 121) were l io isj l >25 mr/hr but were within the allowable tolerance setting by Technical Specification; Ioisl l 3. ) . .C . One monitor (#122) trippm1 at 200 mr/hr which is out of specs and over the l l o l 71 l tolerance level. The consequences of the affected equipment were minimal since [

t o is l I the plant was in refuel mode at the time. I 80 7 8 9 DE CODE SUSC E COMPONENT CODE SUSCOD'E S E

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35 36 l0l0l010l Ji 40 W@ l N lg l Llg 41 42 43 l Gl 0l 8l 0lg 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h liloll There was a difference found in the response between the test signal and the j ml actual signal. Prevfous tests were run with a simulated test signal, the test is  ;

iii2i l now run with an APJ1 calibration device using Cobalt 60 as the source. The procedure j iiial l has been revised to confirm the trip setting by response to the source. All four l ii14i I monitors were recalibrated, using the actual source, to 20 mr/hr high trip point. l 7 8 9 80 ST  % POWER OTHER STATUS DIS O RY OISCOt MY DESCRIPTION I1 isl W @ l0l0l0l@l NA l l B l@l Surveillance Tusting l ACTIVITY CO TENT RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE I i l 6 I W @D OF RELEASE l 2 l@l NA L I' NA l PERSONNEL EXPOS ES NuuSER TvPE oeSCRi,riON @

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• J 8108100297 810730 Richard C. Neild PHONE:

(315)343-2110 Ext. 1528 o$

l PDR ADOCK 05000220 2ARER S

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ATTACINENT TO LER 81-30 Cause Description and Corrective Actions (continued)

The discrepancy between the test signal and the actual signal is still under investigation.

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