05000318/LER-1981-008-03, /03L-0:on 810113,steam Generator 22 Low Pressure Bistable Meter 2D Found Out of Calibr & Signal Isolator 2-E/E-1023A Failed.Caused by Natural Wear & Aging.Cause of Isolator Failure Not Stated

/03L-0:on 810113,steam Generator 22 Low Pressure Bistable Meter 2D Found Out of Calibr & Signal Isolator 2-E/E-1023A Failed.Caused by Natural Wear & Aging.Cause of Isolator Failure Not Stated

ML19351F942
Person / Time
Site:	Calvert Cliffs
Issue date:	02/12/1981
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19351F941	List: 05000318/LER-1981-008, Forwards LER 81-008/03L-0 05000318/LER-1981-008-03, /03L-0:on 810113,steam Generator 22 Low Pressure Bistable Meter 2D Found Out of Calibr & Signal Isolator 2-E/E-1023A Failed.Caused by Natural Wear & Aging.Cause of Isolator Failure Not Stated
References
LER-81-008-03L, LER-81-8-3L, NUDOCS 8102200543
Download: ML19351F942 (2)

LER-1981-008, /03L-0:on 810113,steam Generator 22 Low Pressure Bistable Meter 2D Found Out of Calibr & Signal Isolator 2-E/E-1023A Failed.Caused by Natural Wear & Aging.Cause of Isolator Failure Not Stated

Event date:
Report date:
3181981008R03 - NRC Website

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50-318 LICENSE N0. DPR-69 EVENT DATE 01-13-81 REPORT DATE 02-12-81 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

Steam Generator #22 Low Pressure Bistable meter was found out of calibration and could not be recalibrated. The meter was replaced with a spare. Signal isolator 2-E/E-1023A failed during trouble-snooting giving a constant low octput signal.

It is believed that a faulty signal from this instrument prior to reaching this ultimate state contributed to the indication deviation.

Meter failure is considered the result of aging and natural wear.

The signal isolator (Transmation Model 230IT) is to be modified to increase reliability by reolacing several parts which exhibit high rates of failure.

Facility Change Recuest 80-25 will accomplish the parts change.

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