05000373/LER-1984-066-01, :on 841015,train a ammonia-chloride Alarm Received.Faulty Tape Removed

:on 841015,train a ammonia-chloride Alarm Received.Faulty Tape Removed

ML20099E721
Person / Time
Site:	LaSalle
Issue date:	11/13/1984
From:	Diederich G, Masterson V COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
LER-84-066-01, LER-84-66-1, NUDOCS 8411260042
Download: ML20099E721 (4)

LER-1984-066, on 841015,train a ammonia-chloride Alarm Received.Faulty Tape Removed

Event date:
Report date:
3731984066R01 - NRC Website

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u a, n ei On October 15, 1984, at 0249 the "A" train Ammonia-Chlorine Alarm for the "A" Control Room HVAC/ Auxiliary Equipment Room H','AC (VC/VE; Vl/VE) trains was received in the Control Room. Attempts at resetting the alarm by Operating Department personnel failed.

Instru-ment Maintenance Department personnel were notified and dispatched to investigate the cause of failure.

instrument Maintenance personnel discovered Ammonia-Detector 0XY-VC125B to have a jammed chemcassette tape.

This is what caused the alarm.

The automatic actions following a high Ammonia-Chlorine Alarm is to place the charcoal filter train in service.

This charcoal filter train was already in service due to an operability problem with the filter train bypass damper.

l The faulty portion of the chemcassette was removed and the tape advanced on the transport mechanism spools.

The Ammonia Detector 0XY-VC125B was returned to service at 0328 on October 15, 1984.

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The Ammonia Detector is manufactured by MDA Scientific.

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EVENT DESCRIPTION

On.0ctober 15, 1984, at 0249 the "A" train Ammonia-Chlorine Alarm for the "A"

Control Room HVAC/ Auxiliary Equipment Room HVAC (VC/VE, Vl/VE) train was received in the Control Room. Attempts at resetting the alarn by Operating Department personnel failed.

Instrument Maintenance Department personnel were notified and dispatched to investigate the cause of the failure.

11.

CAUSE

The cause for the Ammonia-Chlorira Alarm was the failure of Ammonia Detector, OXY-VCl25B, when the chemcassette tape jammed.

The Jamming of the tape resulted in that portion of tape becoming dark due to outside air impurities from the sample line being deposited on the tape.

This was detected by the photocells as a high concentration of ammonia, as the photocells sense the amount of light penetration through the tape.

Ill. PROBABLE CONSEQUENCES OF THE OCCURRENCE At the time of the event Unit I was in Operational Condition 4 (Cold Shutdown) with Unit 2 in Operational Condition 1 (Run) at 98% reactor power.

The effect the Ammonia Detector Alarm would have on the "A" VC/VE HVAC train would be the transfer of the "A" train from charcoal filter train bypass to placing the charcoal filter train, OVC01FA, on line.

The charcoal filter train, OVC01FA, (odor eater) was already on line at the time due to inoperability of the charcoal filter train bypass valve, OVCl3YA.

4 The "A" VC/VE HVAC train was in3 conservative plant line-up prior to the Engineered Safety Feature (ESF) actuation which resulted f rom the Ammonia Detector OXY-VCl25B Alarm.

The event had no significant effect on the plant.

IV.

CORRECTIVE ACTIONS

The Instrument Maintenance Department was notified upon receiving the Ammonia Detection Alarm in the Control Room.

During troubleshooting conducted by Instrument Maintenance personnel, the chemcassette tape for Dectector OXY-VCl25B was discovered to be Jammed in the transport mechanism spools.

The faulty portion of tape was removed and the remaining tape advanced on the spools enabling the Ammonia Detector to be reset.

I Work was completed and the Ammonia Detector, OXY-VCl25B returned to operational service at 0328 on October 15, 1984.

i The Ammonia Detector is manufactured by MDA Scientific.

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PREVIOUS OCCURRENCES

None.

VI.

NAME AND TELEPHONE Nt!MBER OF PREPARER Vincent Masterson, 815/357-6761, extension 499 6

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Commonwealth Edison x

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Rural Rout) #1, Box 220

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Telephone 815/357-6761 November 13, 1984 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Dear Sir:

Reportable Occurrence Report #84-066-00, Docket #050-373 is being submitted to your office in accordance with 10CFR 50 73 A

G J. Diederich Superintendent LaSalle County Station l

l GJD/MLD/kg l

Enclosure xc:

NRC, Regional Director INPO-Records Center File /NRC l

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