05000280/LER-1982-058

LER 82-058/03L-0:on 820516,T-26.1 Revealed Component Cooling Sys Radiation Monitor RM-CC-105 Reading Above Alarm Setpoint But Not Alarming.Caused by Out of Calibr Alarm & Oscillator Cards.Cards Calibr

ML20054G177
Person / Time
Site:	Surry
Issue date:	06/08/1982
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20054G165	List: 05000280/LER-1982-024 05000280/LER-1982-027 05000280/LER-1982-057 05000280/LER-1982-058 ML20054G164
References
LER-82-058-03L, LER-82-58-3L, NUDOCS 8206210214
Download: ML20054G177 (2)

LER-2082-058,

Event date:
Report date:
2802082058R00 - NRC Website

text

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REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h IO I2l l With the unit at 1007. PT-26.1 revealed that the Component Coolinst System Radiation l Ml Monitor, RM-CC-105, was reading above the alarm setpoint but not alarming. This is  ;

[ o 14 l l contrary to T.S.3.13 and is reportable per T.S.6.6.2.b.(4). Alarm conditions from l Io is[ l RM-CC-105 provide for closure of the CC Surge Tank Vent Valve, however, Process Vent  ;

Radiation Monitors would have monitored and provided the necessary actions if high 10 l 7 l l activity levels had existed in the C.C. Surge Tank Vent Line. Therefore, public g J O is I l health and safety were not affected. l 7 8 9 SO OE CODE SU8C E COMPONENT CODE SUB ODE S E l0l9l 7 8 lM l C l@ lE l@ W@ lI lN lS lT lR lU l@ y@ W @

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44 47 CAUSE DESCRIPT80N AND CORRECTIVE ACTIONS h Ii )o l l The alarm and oscillator cards in the instrument were found to be out of calibration. l l1 1i11 These cards were calibrated and the radiation monitor was returned to service. I l i l 21.I l i 11 131 l l l ii tell I 7 E 6 80 STA 5  % POWER OTHER ST ATUS DISCO Rv DISCOVERY DESCRIPTION 11 l E l l E l@' l1 l0 l0' l@l" N/A Routine Test l W

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ATTACHMENT 1 SURRY POWER STATION UNIT NO.1 DOCKET NO: 50-280 REPORT NO: 82-058/03L-0 EVENT DATE: 05/16/82 TITLE OF THE EVDIT: Radiation Monitor (RM-CC-105) Failure to Alarm

1. DESCRIPTION OF EVENT:

With Unit 1 at 100% power and Unit 2 shutdown for maintenance, performance of PT 26.1 (Radiation Monitoring Equipment Check) revealed that Component Cooling System Radiation Monitor, RM-CC-105, was reading slightly above the alarm setpoint but was not alarming. This is contrary to Technical Specification 3.13 and 2s reportable per Technical Specification 6.6.2.b.(4).

2. PROBABLE CONSEQUENCES OF OCCURRENCE:

The Component Cooling Radiation Monitor provides for the automatic closure of Component C 311ng Surge Tank Vent Valve (HCV-100) at alarm conditions.

The vent valve discharges to atmosphere through the Process Vent Radiation Monitors, R!!-GW-101 and 102. Since the process vent system was indicated, public health and saf ety were not aff ected.

3. CAUS E:

The failure of the radiation monitor to alarm at setpoint was the result of the alarm and oscillator cards drif ting out of calibration.

4. I}DfEDIATE CORRECTIVE ACTION:

Operations personnel performed the immediate actions of, AP-5.5, which requires closure of the C.C. Surge . Tank Vent Valve.

5. SUBSEQUENT CORRECTIVE ACTION:

The radiation monitor was inspected by the instrument technicians, who found the alarm and oscillator cards to be out of calibration. These cards were calibrated and the instrument was verified operable then returned to service.

6. ACTION TAKEN TO PREVENT RECURRENCE:

No further actions are required.

7. CENERIC IMPLICATIONS:

None.