ML18078A581

LER 78-078/03L-0 on 781130:channel Checks Showed Deviation Between Steam Flow Channels I & II of Steam Generator 13. Caused by Transmitter Zero Shift

ML18078A581
Person / Time
Site:	Salem
Issue date:	12/28/1978
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18078A580	List: ML18078A579 ML18078A581
References
LER-78-078-03L, LER-78-78-3L, NUDOCS 7901020154
Download: ML18078A581 (3)

Text

Report Nwnber: 78-78/03L Report Date: 12/28/78 Occurrence Date: 11/30/78 Facility: Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

No. 13 Steam Generator Steam Flow Channel I i.noperable CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode I Reactor Power 45%

DESCRIPTION OF OCCURRENCE:

Channel checks by the Control Operator on 11-30-78 as the unit was at low power level showed No. 13 Stearn Generator Stearn Flow Channel I reading lower than other channels. A work order was issued to Performance Department and calibration of the sensor transmitter was started at 1030.

Initial "as found" data showed a zero shift and output readings which were greater than allowed by Technical Specification. The channel was declared inoperable at 1100 and Technical Specification 3.3.1.1, Table 3.3.1, Action 7, was implemented. The channel was placed in the tripped condition and remained tripped until 1330 on 12-1-78 when the channel was declared operable and the Action Statement was terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence was a 100 millivolt zero shift of the transmitter caused by the shutdown and startup of the unit. This is not an uncommon occurrence with these transmitters.

ANALYSIS OF OCCURRENCE:.

Technical Specification 3.3.1.1, Action 7, requires that with the number of operable channels, one less than the total nwnber of channels, startup and/or power operations may proceed until performance of the next required channel functional test provided the inoperable channel is placed in the tripped condition within one hour. The channel was placed in the tripped condition for the calibration of the transmitter and the channel was declared inoperable on the basis of the "as found" data. Redundant channels were available throughout this occurrence.

7901.02o\S4 I

LER 78-78/03L CORRECTIVE ACTION:

Difficulty in calibrating the transmitter in place resulted in the transmitter being removed and a bench calibration performed in the Performance Department shop. Data points were verified by an Instrument Supervisor and the transmitter was reinstalled. Comparison checks with other channels showed Channel 1 to be operating properly.

FAILURE DATA:

Not Applicable Prepared by A. W. Kapple SORC Meeting No. 79-78

.._,!R&F'ORM 366 .NUCLEAR REGULATURY COMMISSION (7-77)

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I Channel checks on 11-30-78 showed a deviation between Channel I and Channel II No. 13

~ I S/G Steam Flow Channels. Performance Department was notified and Ch. I was declared

~ I inoperable after "as found" calibration data showed T/S values were exceeded. T/S

[£l]J I 3.3.1.1, Action 7, was implemented with the channel in the tripped condition. The

~. I channel was returned to service at 1330 on 12-1-78 and the Action Statement was ter-

[]JI) I minated. This is the fourth occurrence of this type (77-48, 78-33, 78-49)

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

!This occurrence was caused by a zero shift in the transmitter caused by the shutdown

[J:IJJ I and startup of the unit. The transmitter was bench calibrated and returned to

[JJ]J I service. Channel comparison verified operability. No other corrective action IJJJJ required.

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1 a 9 ao FAC1LITY 13()\ METHOD OF STATUS  % POWER OTHER STATUS \:::;:/ DISCOVERY DISCOVERY DESCRIPTlON @*

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7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY QI TYPE DESCRIPTION i.;:::J rl:TIJ W@ . NA 8 9 10 so PUBLICITY Q\

ISSUED~ DESCRIPTION ~

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