ML20084H892

AO BFAO-7419W:on 740321,diesel Generator a Made Inoperable for 5 H W/O Previous Testing of Eccs.Caused by Personnel Error.Detailed Discussion of Tech Specs Held W/Personnel

ML20084H892
Person / Time
Site:	Browns Ferry
Issue date:	03/29/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
AO-BFAO-7419W, NUDOCS 8305060103
Download: ML20084H892 (3)

Text

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a ' e CHATTANOOGA, TENN'ESSEE VALLt:YTENNESSEE AUTHO AITY i' i '/

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i ha wr" n 18tb 4;/O e :?_M urA Mr. John F. O' Leary, Director i. s J.i:Ni i Directorate of Licensing i g,S7a p Office of Regulation s.

U.S. Atomic Energy Co.waission 5 l Wachington, DC 20545

Dear !!r. O' Leary:

TDIIIESSEE VALLI:Y AUTHORITY - BROMIS FERRY UUCLEAR PIANT UIIIT 1 -

DOCKET UO. 50-259 - FACILITY 'OPERATIEG LICH!SE DPR ABHORMAL OCCURRE!!CE REPORT BFAO-7419W The enclosed report is to provide details concerning "A" diesel generator that was made inoperable for appro :imately 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> without previous testing of the emergency core cooling systems which occurred on Browns Ferry Huclear Plant unit 1 on March 21, 1974, end is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1 October 1973.

3 Very truly yours, TETHESSEE VALLEY AUTHORITY

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,7 'E. F. Thomas Director of Power Production Enclosure CC (Enclosure):

• Mr. Norman C. !!oseley, Director Region II Regulatory Operations Office, USAEC 230 Fenchtree Street,IR?., Suite 818 Atlanta, Georgia 30303

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' Repo*rt Date: Farch 29, 1971i -

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Occurrence Date: March 21,1971+ .

,.. Facility: ,. Browns.Eerry'liuclear Plant unit 1.. . .

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-Identification of Occurrence "A" diesel generator was. made inoperable for approximately ~5 hours without l

In,t.Y, ' : j4V1,09.8 i#,.3.t.1,nBjfy fhg emergency pore; c,ooyng.gst, ems..g ...,y 7. .. .,.jg..,.;g, g.l., .y., ,, ;, 4y Conditions Prior to 'ccurrenceO -

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The reactor was operating at approximately 95-percent power. All' diesel genere. tors and standby core cooling systems were operable.

Description of Occurrence When an item of plcnt equipment is intentionally removed from service for maintenance, plent instructions state that testing required by the technical specifications be conducted before any disassembly begins which would Me the component inccpable of being restored to immediate service. Technical specifi-cations require that, when one diesel generator is found to be inoperable, the remaining three diesel generators, the core spray system, and R9R System (LPCI mode) should be demonstrated to be operable i= ediately. Contrary to these requirements, "A" diesel generator was removed from service for air start rotor maintenance end uas inoperable for a period of approximately 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> without demonstrating the operability of the emergency core cooling systems.

Analysis of Occurrence The diesel generator air start motors were being cleaned, inspected, replaced, and tested at increased frequency because of previous 3y reported problems (BFAO-71513 7). On this date the maintenance foretan requested a clearance from the shift engineer on "A" diesel generator air start motors to perform this maintenance. The shift engineer requested the assistent shift engineer to tes "A" diesel air start motors. The assistant shift engineer then isolated and tar;ged the air supply to both ste.rt motors and the start logic power supply.

The shift engineer recognised that the technical specifications permit one dicac1 generator to be removed from service for ::.aintenance if the remaining .

threc diesels and the emers;cncy core cooling systems are operable. The shift engineer knew that surveillance tests which proved operability of diesel generators had been conducted within the past 21 hours2.430556e-4 days <br />0.00583 hours <br />3.472222e-5 weeks <br />7.9905e-6 months <br /> and considered that the 6 other systems were operable and no additional testing was required.

The start motors were clecned, replaced, and successfully tested. The diesel was then returned to operable condition.

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