ML18037A309

LER 80-025/03L-0:on 801028,stack Gas Monitoring Sys Rendered Inoperable When Inadvertently Left in Purge Operation Mode for 9.5-h.Caused by Technician Failing to Return Sys to Normal Operation.Monitor Returned to Operation

ML18037A309
Person / Time
Site:	Nine Mile Point
Issue date:	11/24/1980
From:	Harrison P NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17053C133	List: ML17053C132 ML18037A309
References
LER-80-025-03L, LER-80-25-3L, NUDOCS 8012100481
Download: ML18037A309 (2)

Text

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NAME OF PREPARER PHONE: CL 49

EVENT DESCRIPTION AND PROBABLY CONSEQUENCES:

During steady state operation the Stack Gas Monitoring System was in-advertently left in the "Purge" mode of operation for approximately nine and one-half hours subsequent to testing. This rendered the equip-ment's only function of monitoring and high level alarms inoperable.

Throughout this time period other monitoring systems were operational and indicated normal steady state release rates. These systems include the Off Gas Monitoring System, the Building Ventilation Constant Air Monitors and the Main Steam Line Radiation Monitors. This event resulted in no adverse environmental effect.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

While completing the Daily Stack Purge and Background Determination Procedure, the technician left the test panel to perform another task, and failed to return to the panel to restore the system to normal opera-tion in accordance with the procedure. This condition was identified during a general check by a Radiation Protection Supervisor whereupon the monitor was immediately returned to normal operation. To prevent future occurrences a procedure change will be made requiring the tech-nician to remain at the test panel during the purge operation.