05000281/LER-1981-032-03, /03L-0:on 810513,radiation Alarm Setpoint for Component Cooling Sys Was Found Greater than Twice Background.Caused by Decrease in Background & Instrument Drift.Monitor RM-CC-106 Reset

/03L-0:on 810513,radiation Alarm Setpoint for Component Cooling Sys Was Found Greater than Twice Background.Caused by Decrease in Background & Instrument Drift.Monitor RM-CC-106 Reset

ML19350E164
Person / Time
Site:	Surry
Issue date:	06/11/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350E160	List: 05000281/LER-1981-032, Forwards LER 81-032/03L-0 05000281/LER-1981-032-03, /03L-0:on 810513,radiation Alarm Setpoint for Component Cooling Sys Was Found Greater than Twice Background.Caused by Decrease in Background & Instrument Drift.Monitor RM-CC-106 Reset
References
LER-81-032-03L-02, LER-81-32-3L-2, NUDOCS 8106170075
Download: ML19350E164 (2)

LER-1981-032, /03L-0:on 810513,radiation Alarm Setpoint for Component Cooling Sys Was Found Greater than Twice Background.Caused by Decrease in Background & Instrument Drift.Monitor RM-CC-106 Reset

Event date:
Report date:
2811981032R03 - NRC Website

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o ;3; ; Unit at 100% power, the Radiation Alarm Setpoint for the Connonent Cnoline System I

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lois1 I monitor, RM-CC-105, was operable and would have initiated the required actions.

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'O ATTAC10fENT 1 STIRRY POWER STATICN, UNIT.2 DOCKET NO:

50-281 REPORT NO:

81-032/03L-0 EVENT DATE:

05-13-81 TITLE OF EVENT:

RADIATION MONITORING (RM-CC-106) SETPOINT 1.

DESCRIPTION OF EVENT

With Unit Two at 100% power and Unit One defueled, Periodic Te:st 26.1 revealed that the Alarm Setpoint for the Component Cooling System Radiation Monitor, RM-CC-106, was greater than twice background. This event is contrary to T.S. 3.7 Table 3.7.5 and is reportable in accordance with T.S. 6.6.2.b. (4).

2.

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT EQUIPMENT:

The Component Cooling Water Radiation Monitors provide for automatic closure of the Component Cooling Surge Tank Vent Valve when the radiation level rises above twice background. The redundant nonitor, RM-CC-105, was verified operational in accordance with AP 5.19 and would have provided i

the required action. Therefore, the health and safety of the public were not affected.

3.

CAUSE

The improper Setpoint has been attributed to a combination of a decrease in background activity and instrument drift.

4.

IMfEDIATE CORRECTIVE ACTION:

Activity levels in the Component Cooling System vere verified to be within allowable limits and a Maintenance Request was initiated to Recalibrate the monitor.

i 5.

SUBSEQUENT CORRECTIVE ACTION:

Radiation Monitor, RM-CC-106, was reset to the correct Setpoint.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

None required.

7.

GENERIC IMPLICATIONS:

None.

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