05000272/LER-1979-011-01, /01X-2 on 790116:RMS Channel Which Had Alarmed & Cleared Had Been Reset at Control Console But Not at RMS Panel.Caused by Procedure Inadequacy.Procedure Changed Initiated to Clarify Functions

/01X-2 on 790116:RMS Channel Which Had Alarmed & Cleared Had Been Reset at Control Console But Not at RMS Panel.Caused by Procedure Inadequacy.Procedure Changed Initiated to Clarify Functions

ML18079A256
Person / Time
Site:	Salem
Issue date:	03/29/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18079A255	List: 05000272/LER-1979-011, Forwards LER 79-011/01X-2 05000272/LER-1979-011-01, /01X-2 on 790116:RMS Channel Which Had Alarmed & Cleared Had Been Reset at Control Console But Not at RMS Panel.Caused by Procedure Inadequacy.Procedure Changed Initiated to Clarify Functions
References
LER-79-011-01X, LER-79-11-1X, NUDOCS 7905140230
Download: ML18079A256 (3)

LER-1979-011, /01X-2 on 790116:RMS Channel Which Had Alarmed & Cleared Had Been Reset at Control Console But Not at RMS Panel.Caused by Procedure Inadequacy.Procedure Changed Initiated to Clarify Functions

Event date:
Report date:
2721979011R01 - NRC Website

text

Report Number:

79-11/0lX-2 Report Date:

3/29/79 Occurrence Date:

1/16/79 Facility:

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

Containment Ventilation Isolation Inoperable CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1 Reactor Power 90%

DESCRIPTION OF OCCURRENCE:

At 2310 hours0.0267 days <br />0.642 hours <br />0.00382 weeks <br />8.78955e-4 months <br /> on 1-15-79, a containment pressure relief was initiated and terminated at 0026 hours3.009259e-4 days <br />0.00722 hours <br />4.298942e-5 weeks <br />9.893e-6 months <br />, 1-16-79.

At 0027 hours3.125e-4 days <br />0.0075 hours <br />4.464286e-5 weeks <br />1.02735e-5 months <br />, the Control Operator observed an alarm light on lRPl for RMS channel lRllA but no control panel bezel indication of a containment ventilation isolation initiation.

The lRllA channel was declared inoperable and Technical Specification 3.3.3.1.b Action 20 was implemented.

Action 22 of the T/S was implemented by the Chief Engineer at 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> when he was informed of the incident.

At 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br />, investigation of the occurrence and a functional test of the lRllA channel had verified that the channel was functioning properly and the Action Statements were terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence is procedure inadequacy in* that the proce-dure used for containment ventilation does not specifically require that the RMS channels lRllA, 1Rl2A and 1Rl2B must be reset at the RMS panel before initiating a containment ventilation evolution.

It appears that 1Rl2A channel had alarmed and then the reading had reduced below the alarm level.

In preparation for the containment pressure relief, the operator verified all three channels indicating below the alarm setpoint and reset the containment ventilation isolation at the control panel but did not reset the 1Rl2A channel at the RMS panel.

When the pressure relief was terminated and channel lRllA alarmed, the isolation signal was blocked by the invalid alarm condition of 1Rl2A.

If a containment ventilation isolation signal is reset at the control console without resetting the cleared channel at the RMS panel, another alarming RMS channel will not initiate an isolation.

This is in accordance with the system design.

The operator expected an isolation signal at the control console bezel and when this did not occur, the channel was declared inoperable.

7 905140 23o

LER 79-11/0lX-2 ANALYSIS OF OCCURRENCE:

Technical Specification 3.3.3.l.b Action 20 refers to T/S 3.4.6.1 which permits continuous operation for 30 days provided grab samples of the containment atmosphere are obtained and analyzed at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

Action 22 refers to T/S 3.9.9 which requires the containment purge and pressure-vacuum relief isolation shut and remain shut until the inoperable channel is returned to service.

The containment ventila-tion isolation valves were shut when the i~cident occurred and remained shut until the lRllA channel was verified operable.

CORRECTIVE ACTION

The containment ventilation isolation circuit actuated by the three RMS channels was tested and verified to be operating properly.

The circum-stances ~nder which this incident occurred were investigated and the cause of the occurrence was determined.

A caution statement has been added to the applicable containment ventilation procedure which clarifies the alarm reset and ventilation isolation reset function.

FAILURE DATA:

Not Applicable Prepared by A. W. Kapple Manager SORC Meeting No.

16-79

NRC l"ORM 366

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[2J1] I During normal operation, while preparing for a containment pressure relief, a RMS

[]J!J I channel which had alarmed and cleared had been reset at the control console but had not been reset at the RMS panel. After*the pressure relief was completed, lRllA channel alarmed but was blocked from initiating a containment ventilation isolation signal by the invalid alarm condition of the previously alarmed RI-".S channel.

T/S [2]}] I 3.3.3.1.b Acti~n.20 and 22 were implemented.

Investigation and functional tests

[§))] I verified lRllA operability.

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A change to the procedure has been initiated to clarify rIIIJ I the ala:rm reset and the ventilation reset function.

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