ML20084H881

AO BFAO-7421W:on 740403,diesel Engine D Failed to Start W/Right Bank of Air Start Motors During Surveillance Test of Diesel Generator Redundant Air Start Sys.Caused by Starter Failure Due to Rust & Possible Lack of Adequate Lubrication

ML20084H881
Person / Time
Site:	Browns Ferry
Issue date:	04/12/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
AO-BFAO-7421W, NUDOCS 8305060080
Download: ML20084H881 (3)

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3 .# r b .Lr A Mr. John F. O' Leary, Director 50-259 Directorate of Licensing ,

Office of Regulation ,

U.S. Atomic Energy Cor: mission Washington, DC 20545

Dear Mr. O' Leary:

. TENIESSEE VALLEY AUTHORITY - BROETNS FERRY UUCLEAR PWIT iMIT 1 -

DOCPET NO, 50-259 - FACILITY OPERATING LICENSE DPR ABNORI&L OCCURRENCE REPORT BFAO-7421W The enclosed report is to provide details concerning a start

system failure on the right bank of standby diesel engine "D."

7nis evet occurred on Browns Ferry Nuclear Plant unit 1 on April 3, ti/4, and is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973 Very truly yours, TENUESSEE VALLEY AUTHORIfY .

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E' F. Themas "reetor of Power Production Enclosure

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Mr. Norman C. Moseley, Director Region II Regulatory Operations Office, USAEC 230 Peachtree Street., NW., Suite 818 ,

Atlanta, Georgia 30303 i

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ABNORMAL OCCUREEdCE REPORT Report No.: BEAO-7421W Report Date: April 12, 1974 Occurrence Date: April 3, 1974 Facility: Browns Ferry Nuclear Plant unit 1 Identification of Occurrence Start system failure on the right bank of standby diesel engine "D."

Conditions Prior to Occurrence Reactor was operating at approximately 90-percent power.

Description of Occurrence On April 3,1974, during performance of special increased frequency surveillance testing of the diesel generator redundant air start system, diesel engine "D" failed to start with the right bank of air starting motors; however, it did start satisfactorily with the left bank.

Analysis of Occurrence Each diesel engine contains two completely independent air starting systems, either of which is capable of starting the engine. The right bank of starters did not start the engine in ihn vanMvM 'ime. Failur,e cf tha rig'.A-lm a starters th'reatened the starting capability of the diesel generator but did not render it inoperable.

to start the engine.

The right-bank starters failed to develop enough torque Corrective Action Both starters of the right bank were removed from the engine. Two replacement starters were installed. The engine started satisfactorily using the replacement '

starters.

Disassembly of the failed starters revealed rust from air supply piping and possible lack of adequate lubrication from the air-line lubricator. The air-line strainer also needed cleaning. The air-line strainer was cleaned and the air-line lubricator was adjusted to provide necessary lubrication to the starters.

The cir relay valve and solenoid valve were also checked for proper operation.

An effort to determine the source of rust had been previously initiated for all diesels. Visual inspection of one starting air receiver tank internal surface has been completed. The inspection revealed rusting of the surface with some loose rust flakes, a small quantity of rater in the bottom of the receiver, and a general appearance that an oil film exists on the surface. The results of this inspection and the rust accumulation problem ture referred to our Design staff.

the problem. They are currently considering various methods of correcting Failure Data s

Starter Data: Ingersoll-Band, Size 150 EIIP, Model 2099H-49

["sco BPAC-744W) and on diesel generator "D" on January 16, 1974 on Februaryimilar-type failur(s occurred "A" on dicee'l generator 25,1974 (see BEAO-7413W). t

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. BFAO-7L21W FailureData(Continued) l As a result of the occurrence on January 16, 1971, 1 the frequency of inspection of all diesel generator air start motors was changed from annual to semiannual.

1 On February 25, 1975, an accelerated program of removing starting motors, ,

blowing do',in air lines, cleaning inlet strainers, rad replacing starters with 4 rebuilt starters was begun.

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