05000259/LER-1979-006-03, /03L-0 on 790228:reactor,turbine Bldg & Refueling Zone Ventilation Exhaust Monitor RM-90-250 Became Inoperable for 3.5-h.Caused by Moisture in SC-2B Detector & Leaking Flanges.Moisture Removed & Flanges Tightened

/03L-0 on 790228:reactor,turbine Bldg & Refueling Zone Ventilation Exhaust Monitor RM-90-250 Became Inoperable for 3.5-h.Caused by Moisture in SC-2B Detector & Leaking Flanges.Moisture Removed & Flanges Tightened

ML19274E505
Person / Time
Site:	Browns Ferry
Issue date:	03/22/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19274E504	List: 05000259/LER-1979-006, Forwards LER 79-006/03L-0 05000259/LER-1979-006-03, /03L-0 on 790228:reactor,turbine Bldg & Refueling Zone Ventilation Exhaust Monitor RM-90-250 Became Inoperable for 3.5-h.Caused by Moisture in SC-2B Detector & Leaking Flanges.Moisture Removed & Flanges Tightened
References
LER-79-006-03L, LER-79-6-3L, NUDOCS 7903290026
Download: ML19274E505 (2)

LER-1979-006, /03L-0 on 790228:reactor,turbine Bldg & Refueling Zone Ventilation Exhaust Monitor RM-90-250 Became Inoperable for 3.5-h.Caused by Moisture in SC-2B Detector & Leaking Flanges.Moisture Removed & Flanges Tightened

Event date:
Report date:
2591979006R03 - NRC Website

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8 60 64 DOCK ET NUMB ER 68 69 EVENT D ATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h 10121 l During normal operation, the reactor, turbine building,and refueling zone ventilation l exhaust monitor RM-90-250 became inoperable (T.S. 3.8.B.8) for a period of 3.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />sg gg io l4I I There are no redundant systems.

A sample was obtained and analyzed as required l l o I s l L efore returning the monitor to service. There was no hazard to the public health l b

lo is l or safety. Previous occurrences: 260/7820 and 259/795.

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36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l Moisture had collected in the detector, SC-2B, causing the amplifier assembly to fail.

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The moisture was removed and the detector replaced. Two flanges were found leaking l

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Form BF-17 BF 15.2 6/09/78 LER SUPPLEMENTAL INFORMATION 3.8.B.8 BFRO-50 259 / 796 Technical Specification Involved 6.7.2.b(2)

Reported Under Technical Specification 1020 1

2/28/79 Time of Occurrence Unit Date of Occurrence Identification and Description of Occurrence:

Particulate detector readings were observed to be incorrect while operations were logging data f rom the reactor, turbine building, and refueling zone ventilation exhaust monitor RM-90-250.

Conditions Prior to Occurrence:

UEit 2 was operating at 70%.

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

The chemical laboratory obtained and analyzed required sample.

Apparent Cause of Occurrence:

Moisture collected in the detector of the monitoring system.

Analysis of Occurrence:

There was no hazard to the puolit tiealtn or sar'ety.

Corrective Action

Dried the system and replaced the detector. A leak in the condensate discharge of the steam packing exhauster was' reduced to an acceptable level. Final repairs will be made at a future outage.

Failure Data:

260/7820 and 259/795.

Tennessee Valley Authority - Browns Ferry Nuclear Plant