05000220/LER-1980-015-04, /04L-0:on 800804,during Steady State Operation, Offgas Monitoring Sys Inadvertently Placed in Purge Mode of Operation.Caused by Technician Error.Sys Returned to Normal Operating Mode,Restoring Sys Operability

/04L-0:on 800804,during Steady State Operation, Offgas Monitoring Sys Inadvertently Placed in Purge Mode of Operation.Caused by Technician Error.Sys Returned to Normal Operating Mode,Restoring Sys Operability

ML18037A283
Person / Time
Site:	Nine Mile Point
Issue date:	08/18/1980
From:	Harrison P NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17053B867	List: 05000220/LER-1980-015, Forwards LER 80-015/04L-0 05000220/LER-1980-015-04, /04L-0:on 800804,during Steady State Operation, Offgas Monitoring Sys Inadvertently Placed in Purge Mode of Operation.Caused by Technician Error.Sys Returned to Normal Operating Mode,Restoring Sys Operability ML17053B866 ML18037A283
References
LER-80-015-04L, LER-80-15-4L, NUDOCS 8008270353
Download: ML18037A283 (2)

LER-1980-015, /04L-0:on 800804,during Steady State Operation, Offgas Monitoring Sys Inadvertently Placed in Purge Mode of Operation.Caused by Technician Error.Sys Returned to Normal Operating Mode,Restoring Sys Operability

Event date:
Report date:
2201980015R04 - NRC Website

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EVENT DESCRIPTION

AND PROBABLE CONSEQUENCES During steady state operation the Off Gas Monitoring System was inadvertently placed in the "purge" mode of operation for approximately three (3) hours, rendering the automatic isolation capability of the off gas system inoperable during, this time period.

However, throughout this time frame the fina3. Gaseous Effluent Release monitoring system was fully operational, along with other station radiation and airborne monitoring equipment such as continuous air monitors and Main Steam Line Radiation monitors.

All of the above instruments indicated normal steady state release rates, and consequently there was no adverse effect on the environment.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS While performing the Daily Stack Purge and Background determination procedure, the Technician inadvertently put the Off Gas Monitoring system rather than the stack Gas Monitoring System in the "purge" mode of operation.

This was discovered during a routine panel check by the Control Room Operator, who immediately returned the system to the normal operating

mode, thus restoring system operability.

A review of the procedure has been conducted with the technician involved, and future recurrence of this event is unlikely.