ML19210D656

LER 79-027/03L-0:on 791001,during Routine Surveillance Procedure MS-DPIS-119B,switch Was Found W/Setpoints in Excess of Tech Specs.Caused by Setpoint Drift.Instrument Recalibr

ML19210D656
Person / Time
Site:	Cooper
Issue date:	10/29/1979
From:	Phillips D NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19210D647	List: ML19210D646 ML19210D656
References
LER-79-027-03L, LER-79-27-3L, NUDOCS 7911270432
Download: ML19210D656 (1)

Text

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NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION 17.7 7 )

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t.d EVENT DATE 74 75 fl0 7 8 60 61 DOCK ET NUVSER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h o 2 While performing routine surveillance procedure 6.2.1.4.2, MS-DPIS-119B was found I o a Iwith a setpoint in excess of the allowed Technical Specifications Table 3.2.A. All 1 o 4 l redundant differential oressure switches were functionine proceriv and were within I o 5 lsnecification. There were no sicmifienne occurrences ng n result of this s-vene nrui I a 6 lthere were no adverse affects to public health and safety. This event is repetitivel O 7 I(LER 79-23)

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3J J4 35 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l MS-DPIS-119B is a Barton Model 288 differential pressure indicating switch. The l IiiilI cause of the setpoint drift is attributed to the " set" a new instrument may take I

, , after installation. The instrument was recalibrated and checked satisfactorily by i W l performance of S.P. 6.2.1.4.2. The I&C Shop guide was revised to require exercis- I

. i 4 l ing the quitch during iner,11ntion to reduce this setroint drift. 4 -

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