05000259/LER-1981-015-03, /03L-0:on 810428,during Refueling Outage,Air Monitor 1-RM-90-250 for Reactor Turbine Bldg Ventilation Found Inoperable Due to Instrument Indicating Downscale. Caused by Failed Detector High Voltage.Voltage Repaired

/03L-0:on 810428,during Refueling Outage,Air Monitor 1-RM-90-250 for Reactor Turbine Bldg Ventilation Found Inoperable Due to Instrument Indicating Downscale. Caused by Failed Detector High Voltage.Voltage Repaired

ML20004B159
Person / Time
Site:	Browns Ferry
Issue date:	05/20/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004B157	List: 05000259/LER-1981-015, Forwards LER 81-015/03L-0 05000259/LER-1981-015-03, /03L-0:on 810428,during Refueling Outage,Air Monitor 1-RM-90-250 for Reactor Turbine Bldg Ventilation Found Inoperable Due to Instrument Indicating Downscale. Caused by Failed Detector High Voltage.Voltage Repaired
References
LER-81-015-03L, LER-81-15-3L, NUDOCS 8105270313
Download: ML20004B159 (2)

LER-1981-015, /03L-0:on 810428,during Refueling Outage,Air Monitor 1-RM-90-250 for Reactor Turbine Bldg Ventilation Found Inoperable Due to Instrument Indicating Downscale. Caused by Failed Detector High Voltage.Voltage Repaired

Event date:
Report date:
2591981015R03 - NRC Website

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5 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h for the reactor /

I I o i 2 l I During refueling outage, continuous air monitor (1-RM-90-250)

Jturbine building ventilation was declared inoperable due to instrument indicating l

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l o l A J I downscale (T.S. 3. 8.B. 8, 3. 8.B.6). There was no danger to the health or safety of l

1 n ;., j lthe public. There were no redundant systems. Previous similar events: BFRO-50-259/ l

} U ls l l 3071, 8079, 8110; 260/78020, 78022: 196/76014W.

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JJ CAUGE DESCRIPTION AND CORRECTIVE ACTIONS h Ii).iIl Detector high voltage failed, causing the continuous air monitor to indicate down-l The NMC detector high voltage of I

Ii)ij l scale. The Chemical Lab started samplins; program.

CAM, NMC Model AM-331 BF was repaired, functionally tested, and returned to service l

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kynnessee Vality Authority Form BF-17 BF 15.2 Browns Ferry Nuclear Plant 3/24/81 LER SUPPLEMENTAL INFORMATION BFRO 259 / 81015 Technical Specification Involved 3.8.B.8 and 3.8.B.6 Reported Under Technical Specification 6.7.2.b(2)

Date of Occurrence 4/28/81 Time of Occurrence 2245 Unit 1

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Identification and Description of Occurrence:

- Continuous air monitor (1-RM-90-250) for the reactor / turbine building ventilation inoperable.

Cond? ions Prior to Occurrence:

Unit i refueling outage.

Unit 2 at 99%.

Unit 3 at 100%.

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

Chemical Lab took readings every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

Instrument mechanics working on continuous air monitor.

.1pparent Cause of Occurrence:

Moisture in the sample line.

Analysis of Occurrence:

There was no danger to the health or safety of the public, no release of activity, no damage to the plant or equipment, and no resulting significant chain of events.

Corrgetive Action:

Started sampling program. Repaired, functionally tested, and ?:eturned continuous air monitor to service.

Failure Data:

3 FRO-50-259/8071, 8079, 8110; 260/78020, 78022; 296/76014W.

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