ML20084H881
| 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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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 CC(Enclosure):
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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o 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.
The right-bank starters failed to develop enough torque to start the engine.
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.
They are currently considering various methods of correcting the problem.
Failure Data s
Starter Data:
Ingersoll-Band, Size 150 EIIP, Model 2099H-49
["sco BPAC-744W) and on diesel generator "A"
on Februaryimilar-type failur(s occurred on dicee'l generator "D" on January 16, 1974 25,1974 (see BEAO-7413W).
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BFAO-7L21W FailureData(Continued) l As a result of the occurrence on January 16, 1971, the frequency of inspection 1
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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