ML20085L943

AO BFAO-7413W:on 740225,during Diesel Generator Test,Diesel Generator a Failed to Start W/Left Bank of Starters.Caused by Rust from Air Supply Sys.Replacement Starters Installed & Air Supply Sys Blown Out

ML20085L943
Person / Time
Site:	Browns Ferry
Issue date:	03/07/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085L944	List: ML20085L943 ML20085L950
References
AO-BFAO-7413W, NUDOCS 8311070037
Download: ML20085L943 (3)

Text

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l' TENNESSEE VALL AUTHO AITY L"""Eh CHATTANCOGA TENNESSEE : 3 37401 L /A r

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Mr. John F. O' Leary, Director Directorate of Licensing Office of Regulation U.S. Atomic Energy Comission Washington, DC 20545

Dear Pr. O' Leary:

TEmiESSEE VALI5Y AUTHORITY - BROMS FERRY NUCLEAR PLAIIT UNIT 1 -

DOCKET No. 50-259 - FACILITY OPERATING LICENSE DPR ABNORMAL OCCURRE: ICE REPORT BFAO-7413W The enclosed report is to provide details concerning start system failure on standby diesel engine A which occurred on Browns Ferry Nuclear Plant unit 1 on February 25, 1974, and is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973

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N irector of Power Production $ 3f *

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Enclosure -

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Pr. Nor=an C. Moseley, Director -

. Region II Regulatory Operations Office, USAEC 230 Peachtree Street, IM. , Suite 818 Atlanta, Georgia 30303 l

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J D ABNORMAL OCCURRENCE REPORT

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Report No.: BFAo-7413W Report Date: March 7, 1974 l

. Occurrence Date.: February 25, 1974 . . .

~ Facility: Browns Ferry Nuclear Plant unit 1 Identification of Occurrence Start system failure on standby diesel engine "A."

Conditions Prior to Occurrence Reactor was at 63-percent power.

Description of Occurrence .

On February 25, 1974, during testing of the diesel generator, "A" diesel generator failed to start with the left bank of starters; however, it did start satisfactorily .

with the right bank of ste.rters.

Analysis of Oscurrence Each. diesel engine contains two co=pletely independent air-starting syste=s,

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either of which .is .canable of.. starting the' engine. . When the' left., bank of . . -

"sisarters did hot starti the" engine'iii the'r'equirediimsjiihh right'beIk 'of ' ' '

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I starters was energized auto =atically and started the engine. Failure of the left bank starters threatened the starting capability of the diesel generator but did not render it inoperable. The left bank starters failed to develop enough torque to start the engine.

Corrective Action Both left bank starters were removed from the engine. Disassembly of the removed starters revealed rust from the air supply system. Replacement starters were installed. The air supply cystem was blown out, the air line filter was cleaned, and the air line lubricator was serviced. The engine started se.tisfactorily -

using the replacement starters. An accelerated progrem of removing strrting motors, blowing down air lines, cleaning inlet strainers, end replacing sterters with rebuilt starters has begun end will be co=pleted within one month.

Consideration is being given to the replacement of ferritic material. in the air system with stainless steel to eliminate rusting.

The starting ability of both starter banks on each diesel will be checked twice a month until three successful consecutive starts demonstrate reliability. .

Following satisfactcry demonstration of reliability at.this frequency, a bimonthly starting ability check will be resumed.

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Failure Data Starter data: Ingersoll-Rand, size 150 B:2, model 289 RH-49.

A.similar type failure occurred on diesel generator "B" on January 16, 1974 (see BFAO-744W). As a result of that occurrence, the frequency of inspection of all diesel generator air start motors was changed from annual to semiannual. The air start system on "A" diesel Generator was inspected, cleaned, and blown down; and clean air start notors were installed on February 6,1974, as a result of this accelerated program.

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