05000336/LER-1981-017-02, /03L-0:on 810427,during Routine Operations,Safety Injection Tank Level Transmitter Indicated Normal Level W/High Level Alarm Present.Caused by Instrument Drift. Recalibr Restored Proper Level in Indication

/03L-0:on 810427,during Routine Operations,Safety Injection Tank Level Transmitter Indicated Normal Level W/High Level Alarm Present.Caused by Instrument Drift. Recalibr Restored Proper Level in Indication

ML20004B971
Person / Time
Site:	Millstone
Issue date:	05/22/1981
From:	NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20004B964	List: 05000336/LER-1981-017, Forwards LER 81-017/03L-0 05000336/LER-1981-017-02, /03L-0:on 810427,during Routine Operations,Safety Injection Tank Level Transmitter Indicated Normal Level W/High Level Alarm Present.Caused by Instrument Drift. Recalibr Restored Proper Level in Indication
References
LER-81-017-02L, LER-81-17-2L, NUDOCS 8106010367
Download: ML20004B971 (1)

LER-1981-017, /03L-0:on 810427,during Routine Operations,Safety Injection Tank Level Transmitter Indicated Normal Level W/High Level Alarm Present.Caused by Instrument Drift. Recalibr Restored Proper Level in Indication

Event date:
Report date:
3361981017R02 - NRC Website

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EVENT OESCRIPTION AND PROB ABLE CONSEQUENCES h I

gg l During routine operations, the A Safety Injection Tank (SIT) Level transmitter was A calibration check and l

g l indicating normal level with a high level alarm present.

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g l t-eadjustment of the transmitter revealed actual level to be 58.3 percent.

o g i accordance with Technical Specificaticas section 3.5.1, action a, the tank was I

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gg i mmediately drained to 57.7% level.

i TTO l 15 minutes.

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121011 The cause of the erroneous level indication was found to be instrument drift i li J l causing indicated level to be lowet than actual.

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