05000272/LER-1979-007-03, /03L-0 on 790126:while Performing Channel Check of Pressurizer Level,Channel II Found 5% Lower than Others. Caused by Instrument Drift Resulting in Zero Shift in Transmitter Output

/03L-0 on 790126:while Performing Channel Check of Pressurizer Level,Channel II Found 5% Lower than Others. Caused by Instrument Drift Resulting in Zero Shift in Transmitter Output

ML18078A879
Person / Time
Site:	Salem
Issue date:	02/23/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18078A878	List: 05000272/LER-1979-007, Forwards LER 79-007/03L-0 05000272/LER-1979-007-03, /03L-0 on 790126:while Performing Channel Check of Pressurizer Level,Channel II Found 5% Lower than Others. Caused by Instrument Drift Resulting in Zero Shift in Transmitter Output
References
LER-79-007-03L, LER-79-7-3L, NUDOCS 7902270293
Download: ML18078A879 (3)

LER-1979-007, /03L-0 on 790126:while Performing Channel Check of Pressurizer Level,Channel II Found 5% Lower than Others. Caused by Instrument Drift Resulting in Zero Shift in Transmitter Output

Event date:
Report date:
2721979007R03 - NRC Website

text

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Report Number:

'-07/03L Report Date:

02-23-79 Occurrence Date:

1-26-79 Facility:

Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Pressurizer Level Channel II Inoperable CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1 Reactor Power 70%

DESCRIPTION OF OCCURRENCE:

At 1310 hours0.0152 days <br />0.364 hours <br />0.00217 weeks <br />4.98455e-4 months <br />, while performing channel checks of pressurizer level, Channel II was found to be indicating approximately 5% lower than other channels.

Technical Specifications 3.3.1.1, Action 7, and 3.3.2.1, Action 14, were implemented.

The channel bistables were placed in the tripped condition.

The channel was returned to service at 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />.

on 2-3-79 and the Action Statements were terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence was transmitter drift which resulted in a zero shift in the transmitter output.

ANALYSIS OF OCCURRENCE:

Actions 7 and 14 for Technical Specifications 3.3.1.1 and 3.3.2.l permit operation until the next required channel functional test with the num-ber of operable channels one less than the total number of channels provided the inoperable channel is placed in the tripped condition within one hour.

Pressurizer lev.el Channel II was placed in the tripped con-dition within one hour and remained in this condition until the channel was returned to operable status.

Pressurizer level Channels I and IV were operable throughout this occurrence.

CORRECTIVE ACTION

The pressurizer level Channel II transmitter was recalibrated in place in accordance with Performance Department procedure.

A channel functional test was performed to verify operability.

7 9 0 2 2 7 0 2 13*

LER 79-07/03L

• FAILURE DATA:

Not Applicable Prepared by --~-A_.~w_.~K_a~p~p.._l_e~~

SORC Meeting No.

79-10

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES @

!During normal operation, while performing a channel check of pres-

((ID I surizer level, Channel II was found indicating approximately 5% lower

((II] 1than other channels.

Actions for T/S 3.3.1.1 and 3.3.2.1 were

((ill I implemented.

The channel was reworked and returned to service at 1000

[)))) 1hours on 2-3-79 and the T/S actions were terminated.

This is the fifth

@JI] 1occurrence of this type (77-48, 78-33, 78-49, 78-78) rnIJ 7

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CAUSE

CAUSE COMP.

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OCCURRENCE REPORT REPORT NO.

COOE TYPE VAL.VE suscooE UJ@

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~ l=l 23 24 26 27 28 29 30 31 REVISION NO *.

LaJ 32 80 ACTION FUTURE TAKEN ACTION EFFECT SHUTDOWN

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CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

44 47 o::::I§] !The cause of this occurrence was instrument drift resulting in a zero 1JJJJ f shift in the transmitter output.

The transmitter was recalibrated and OJil 1a channel functional check verified channel. operability.

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