ML18139B249

LER 81-024/03L-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

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: ML18139B247 ML18139B249
References
LER-81-024-03L-02, LER-81-24-3L-2, NUDOCS 8104210320
Download: ML18139B249 (2)

Text

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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 I System was found to be greater than twice background. This ev*ent is contra;r;y 1=9_

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ATTACHMENT 1 SURRY POWER STATION, UNIT 2 DOCKET NO: 50-281 REPORT NO: 81-024/03L-0 EVENT DATE: 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.