05000272/LER-1979-012-03, /03L-0 on 790115:No 11 Steam Generator Steam Flow Channel II Failed Low.No Cause Found.Operator Took Manual Control & re-established Steam Generator Level.Channel Indication Normalized within 10 Minutes

/03L-0 on 790115:No 11 Steam Generator Steam Flow Channel II Failed Low.No Cause Found.Operator Took Manual Control & re-established Steam Generator Level.Channel Indication Normalized within 10 Minutes

ML18078A852
Person / Time
Site:	Salem
Issue date:	02/13/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18078A851	List: 05000272/LER-1979-012, Forwards LER 79-012/03L-0 05000272/LER-1979-012-03, /03L-0 on 790115:No 11 Steam Generator Steam Flow Channel II Failed Low.No Cause Found.Operator Took Manual Control & re-established Steam Generator Level.Channel Indication Normalized within 10 Minutes
References
LER-79-012-03L, LER-79-12-3L, NUDOCS 7902200039
Download: ML18078A852 (3)

LER-1979-012, /03L-0 on 790115:No 11 Steam Generator Steam Flow Channel II Failed Low.No Cause Found.Operator Took Manual Control & re-established Steam Generator Level.Channel Indication Normalized within 10 Minutes

Event date:
Report date:
2721979012R03 - NRC Website

text

Report Number:

79-12/03L Report Date:

02-13-79 Occurrence Date:

1-15-79 Facility:

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

• No. 11 Steam Generator Steam Flow Channel II Inoperable CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1 Reactor Power.91%

DESCRIPTION OF OCCURRENCE:

At 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />, No. 11 Steam Generator steam flow Chann'el II, which was.

the controlling channel for No. 11 Steam Generator level control, failed low.

The Control Operator took manual control and re-established S/G level.

Action 7 for Technical Specification 3.3.1.1 and Action 14 for T/S 3.3.2.1 were implemented.

Channel bistables were placed in the tripped condition.

The channel indication returned to normal within ten minutes of failing low and indicated properly throughout the remainder of the occurrence.

At 1930 hours0.0223 days <br />0.536 hours <br />0.00319 weeks <br />7.34365e-4 months <br /> on 1-16-79, the channel was returned to service and the T/S Action Statements were terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurren.ce could not be determined.

All tests con-ducted showed the channel to be operating properly.

ANALYSIS OF OCCURRENCE:

The Action Statements for Technical Specificat~ons 3.3.l.l and 3.3.2.l allow continued operation until performance of the next required Channel Functional Test, provided the inoperable channel is placed in the tripped condition within one hour.

The inoperable channel was tripped and remained in the tripped condition throughout this occurrence.

No. 11 S/G steam flow Channel I was operable and provided steam flow protection during this time.

Channel II was returned to operable status within 27 hours3.125e-4 days <br />0.0075 hours <br />4.464286e-5 weeks <br />1.02735e-5 months <br />.

J

LER 79-12/03L CORRECTIVE ACTION:

Troubleshooting was performed consisting of applying test currents to the channel over the range of channel operation and monitoring channel response.

Internal and external connections were inspected.

A brush recorder connected to record the steam flow input to the channel was monitored over a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> period.* No problem areas could be identified.

FAILURE DATA:

Not Applicable Prepared by A. W. Kapple Manager - Sa"lemGenerating Station SORC Meeting No.

9-79

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[§:))] I At 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />, No. 11 S/G steam flow Channel II failed low.

Action 7

[]I[} I for T/S 3.3.1.1 and Action 14 for T/S 3.3.2.1 were initiated.

No. 11 IIfil I S/G level control was switched to manual and the c.hannel was placed J

!]I[] I in the tripped condition.

Channel indication returned to normal within!

((I[] I ten minutes.

The channel was returned to service at 1930 hours0.0223 days <br />0.536 hours <br />0.00319 weeks <br />7.34365e-4 months <br /> on

[§12] I 1-16-79 and the T/S Action Statements were terminated.

This is the t_ __

[)))) I first occurrence of this type.

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CAUSE

CAUSE COMP.

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CODE TYPE NC.

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COMPONENT TAKEN ACTION ON PLANT METHOD HOURS ~ SUBMITTED FORM :;UB.

SUPPLIER MANUFACTURER

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

4 43 44 47 III)) I Cause of this occurrence could not be determined.

Troubleshooting

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• -**--EID consisted of test currents over the operating range of the channel,and1

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IIIIl internal *and external connection inspec.tion. 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> monitoring of DJ)) I steam flow transmitter output by brush recorder showed no existing

£III] l problems with the channel.

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