ML20084H507

AO BFAO-7440W:on 740614 Radwaste Bldg Vent Monitoring Channel Was Out of Svc for More than 1 H W/O Temporary Monitor.Caused by Failure to Turn on High Voltage on Vent Monitoring Channel Constant Air Monitor After Maint

ML20084H507
Person / Time
Site:	Browns Ferry
Issue date:	06/21/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084H510	List: ML20084H507 ML20084H512
References
AO-BFAO-7440W, NUDOCS 8305040397
Download: ML20084H507 (2)

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-~ - n a Mr. John F. O' Leary, Director 'f. [fj;g,' 4Q(). r%.YLVA Directorate of Licensing 4 j' d Office of Regulation c. q, >

U.S. Atomic Energy Commission Washin5 ton, DC 20545

Dear Mr. O' Leary:

TETNESSEE VALLEY AUTHORITY - BROIR!S FERRY NUCLEAR PLAIIT UNIT 1 -

DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR ABHORMAL OCCURRE: ICE REPORT BFAO-7440W The enclosed report is to provide details concerning the radwaste bui1Mng vent monitoring channel which was out of service for more than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> without providing a temporary monitor in violation of technical specification 3.8.3.8. and is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973.

This a .. cc a rou vu 3 m nu. Fun, Haeluur FleuL uniL 1 on June 14, 1974.

Very truly yours, TECTESSEE VALLEY AUTHORITY E. F. Thomas M

Director of Power Production Enclosure CC (Enclosure):

Mr. Norman C. Foseley, Director Region II Regulatory Operations Office, LEAEC 230 Peachtree Street, IIW., Suite 818 Atlanta, Georgia 30303 p .

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,i ABNORMAL OCCURREtICE REPORT .i Report No.: BFAO-7440W Report Date: June 24, 1974 .

Occurrence Date: June 14, 1974 Facility: Browns Ferry Nuclear Plant unit 1 Identification of Occurrence The radwaste building vent =6nitoring chcnnel was out of service for more than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> without providing a te=porary =onitor in violation of technical specifi-

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cation 3.8.B.8.

Conditions Prior to Occurrence Reactor was operating at approximately 80 percent in the startup test program.

Designation of Antarent Cause of Occurrence During the routine daily background check at approximately 3:50 a.m., the high

. voltage on the vent monitoring channel constant air menitor (CAM) was turned off to re=ove the filters and again to replace them. After the unit was reassc= bled, the high voltage was inadvertently left off causing all three detectors to be inoperable. ',

At approximateAv 5:30 a.m., it was noticed that the channel was not responding.

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Analysis of Occurrence During the period that the high voltage was turned off, the sample punp was -

operational. Therefore, a particulate and a halogen sa=ple were being collected

. on the respective filters which would have indicated a higher reading than that before the background check had a release of radioactive particulate or halogens

- occurred. Since no higher reading was indicated, the local air particulate conitors and area radiation tonitors in the radwaste building showed no changes, and no operations that would lead to a release of airborne radioactivity took place during the period'of incperability, there is reasonable assurance that no unmonitored release of radioactivity occurred.

Corrective Action The.4-adiate corrective action was to turn the high voltage on which restored the detectors to service. Subsequently, the procedure for obtaining background 4

readings vec. modified to specifically require the high voltage be turned back en if applicabic and to verify proper operation of instrument. E=ployees involved in the backgrouni check procedure will be reminded of the critical nature of.

effluent monitors and to exercise caution in assuring proper operation after performing checks.

Failure Data '

i No equipment failure was involved in this occurrence.

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