05000260/LER-1978-020, Forwards LER 78-020/03L-0

Forwards LER 78-020/03L-0

ML18024A576
Person / Time
Site:	Browns Ferry
Issue date:	12/07/1978
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024A577	List: 05000260/LER-1978-020, Forwards LER 78-020/03L-0 05000260/LER-1978-020-03, /03L-0 on 781110:during Normal Pwr Oper,Reactor & Turbine Bldg & Refueling Zone Ventilation Exhaust Monitor, RM-90-250 Became Inoperable.Instr & Its Sensing Line Dried Out & Returned to Svc
References
NUDOCS 7812120174
Download: ML18024A576 (6)

LER-1978-020, Forwards LER 78-020/03L-0

Event date:
Report date:
2601978020R00 - NRC Website

text

December 7, 1978 TENNESSEE VALLEYAUTHORITY CHATTANOOGA. TENNESSEE, 3740t REGULATORY DOCKET FILE COPY th. James P. O'Roilly, Director U.S. Nucloa latory C sion Office o space and forcement Region I'01 Harieeea Street, Suite 3100 Atlanta, Georgia 30303 Deax Nr. O'Reilly:

The enclosed report. provides deeailo concerning the reactor and turbine building and xofueling mone ventilation ozhauot monitor, RN-90-250,

~Sich became inoperablo for a period of eight houxs during normal paver operation.

This report is submitted in accordance with Brcwns Perry'nit 2 technical opecificaeioi 6.7.2.b.(2).

Very truly youx's, TENNESSEE VALLEYAUTHORITY TEIQKSSEE VALLEY AUTHORXTY - BROHHS PERRY HUCLEAR PLANT UNIT 2 DOCKET NO. 50<<260 - PACILXTY OPERATINQ LICENSE DPR REPORTABLE OCCBGtENCE REPORT BPRO-50-260/7820 H. S. Pox Director of Pouer Production Enclosux'e (3) cc (Enclosure):

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Office of Hanagemont Information and Program Control U.S. Nuclear Regulatory Commission Uashington, D.C, 20555 Director (40)

Office of Inspection and Enforcement U.S. Huclcar Regulatory Cozmd,anion Uaohingeon, D.C.

20555 64p VSO.M.S o i I An Equal Opportunity Employer

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'74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES 010 Durin normal power operation, Reactor and Turbine Buildin and Refuelin Zone Venti-

~03 lation Exhaust Monitor, RM-90-259 became inoperable (T. 8 ~

3 ~ 8 ~ B ~ 8) for a period of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

There are no redundant systems.

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Condensation from the ventilation sam lin lines leadin to the Nuclear Measurements Cor

. Model AM-331F (BF) Radiation Monitor had caused a moisture buildu i l

tor sensing chamber.

The instrument and its sensin lines were dried out and returned 3

to service.

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contemplated.

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Identification and Descri tion of Occurrence:

Reactor and Turbine Building and Refueling Zone Ventilation Exhaust Monitor, RM-.90-25$ became inoperable during power operations.

Conditions Prior to Occurrence:

The unit was operating at 100% power under steady-state conditions.

Action specified in the Technical Specification Surveillance Requirements met due to ino erable e ui ment.

Describe.

Grab samples of the ventilation exhaust were take@

and analyzed hourly until the ventilation monitor was repaired (tt hours).

A arent Cause of Occurrence:

Condensation in the sensing chamber of the Nuclear Measurements Corporation Model AM-331F (BF) radiation monitor rendered it inoperative.

Anal sis of Occurrence:

The'ource of the moisture in the monitor chamber was condensation in the sample lines.'orrective

=Action:

The radiation monitor detector chamber and sensing lines were dried out and returned to service.

No further problems were experienced.

Failure Data:

None previous.

Tennessee Valley Authority - Browns Ferry Nuclear Plant

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