05000281/LER-1981-024-03, /03L-0:on 810320,w/Unit 2 at 100% Power,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Decrease in Background Activity. Monitor RM-CC-106 Reset to Correct Setpoint

/03L-0:on 810320,w/Unit 2 at 100% Power,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Decrease in Background Activity. Monitor RM-CC-106 Reset to Correct Setpoint

ML18139B249
Person / Time
Site:	Surry
Issue date:	04/16/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B248	List: 05000281/LER-1981-024, Forwards LER 81-024/03L-0 05000281/LER-1981-024-03, /03L-0:on 810320,w/Unit 2 at 100% Power,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Decrease in Background Activity. Monitor RM-CC-106 Reset to Correct Setpoint
References
LER-81-024-03L-02, LER-81-24-3L-2, NUDOCS 8104210320
Download: ML18139B249 (2)

LER-1981-024, /03L-0:on 810320,w/Unit 2 at 100% Power,Radiation Alarm Setpoint for Component Cooling Sys Found Greater than Twice Background.Caused by Decrease in Background Activity. Monitor RM-CC-106 Reset to Correct Setpoint

Event date:
Report date:
2811981024R03 - NRC Website

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l During the Performance of PT-26,1, Radiation :Monitoring Equipment Test. with C[I:rJ ! the Unit at 100% power, the Radiation Alarm Setpoint for the c*omponen~- Cooling System was found to be greater than twice background.

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ATTACHMENT 1 SURRY POWER DOCKET NO:

REPORT NO:

EVENT DATE:

STATION, UNIT 2 50-281 81-024/03L-0 03-20-81 TITLE OF EVENT:

RADIATION MONITORING (RM-CC-106) SETPOINT

1.

DESCRIPTION OF EVENT

With Unit Two at 100% power and Unit one defueled, Periodic Test 26,l 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 AJm STATUS OF REDUNDANT EQUIPMEJ\\"l'f:

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 monitor, R..M-CC-105, was verified operational in accordance with AP 5.19 and would have provided the required action.

Therefore, the health and safety of the public were not affected,

3.

CAUSE

The improper Setpoint has been attributed to a decrease in background acitvity.

4.

IMMEDIATE CORRECTIVE ACTION

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

5.

SUBSEQUENT CORRECTIVE ACTION:

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

6.

ACTION TAKEN TO PREVENT *RECURRENCE:*

None Required.

7.

GENERIC IMPLICATIONS:

None.