05000333/LER-1980-020-04, /04L-0:on 800205,during Routine Shutdown & Cooldown Operations,Plant Stack Gas Monitoring Sys Was Inoperable Due to Freeze Up of Sample Line.Caused by Cold Weather & Purge of Humid Containment Atmosphere

/04L-0:on 800205,during Routine Shutdown & Cooldown Operations,Plant Stack Gas Monitoring Sys Was Inoperable Due to Freeze Up of Sample Line.Caused by Cold Weather & Purge of Humid Containment Atmosphere

ML19290E376
Person / Time
Site:	FitzPatrick
Issue date:	03/05/1980
From:	POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19290E371	List: 05000333/LER-1980-020-04, /04L-0:on 800205,during Routine Shutdown & Cooldown Operations,Plant Stack Gas Monitoring Sys Was Inoperable Due to Freeze Up of Sample Line.Caused by Cold Weather & Purge of Humid Containment Atmosphere
References
LER-80-020-04L, LER-80-20-4L, NUDOCS 8003110046
Download: ML19290E376 (2)

LER-1980-020, /04L-0:on 800205,during Routine Shutdown & Cooldown Operations,Plant Stack Gas Monitoring Sys Was Inoperable Due to Freeze Up of Sample Line.Caused by Cold Weather & Purge of Humid Containment Atmosphere

Event date:
Report date:
3331980020R04 - NRC Website

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w POWER AUTit0RITY OF THE STATE OF NEW YORK JAMES A. FIT 2 PATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 80-020/04L-0 Page 1 of I During rout ine shutdown and cooldown opera t ions, the plant stack gas monitoring system sample line froze up.

Envi ronmen tal Technica l Speci fications pa ragraph 2.3. A.9 requi res continuous sampling whenever s team pressure is available to the main condenser steam jet ai r ejectors.

The reactor was at approximately 300 psig and cooldoan operations were being conducted utilizing the main condenser, radioactive gases from the reactor coolant system were being vented to the environment via the main condenser, of fgas system and main stack.

Since the reactor was shutdown, the sample line was cleared by blowing down with dry nitrogen and res tored to service within one (1) hour, the event did not represent a signi ficant hazard to the public heal th and safety.

Investigation revealed that the heat trace system for the sample line was ope ra t ing p rope r l y.

Since containment purging and de-inerting operations were in progress, it is believed that this operation, which results in the discharge of humid ai r to the s tack, caused condensat ion freeze up in the line.

Due to the short duration of the plant outage which followed, complete inspection and evaluation of the sample line and sample probe design with respect to preventing f reeze up in the future, was not possible.

A work request has neen wri t ten for inspection of the sample line and probe during the forthcoming refueling outage to determine if any nodi fications of the sampling system or the heat tracing system associated with the line should be made to prevent recurrence. When this inspection and evaluation has been completed a followup report will be submitted.

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