ML20085E978
| ML20085E978 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 05/30/1975 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Rusche B Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20085E979 | List: |
| References | |
| NUDOCS 8308180185 | |
| Download: ML20085E978 (3) | |
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Mr. Benard C. Rusche Director of Nuclear Reactor Regulation f
U.S. Nuclear Regulatory Commission Wachington, DC 20555 i
Dear Mr. Rusche:
TEUNESSEE VALLEY AUTHORITY - BROWS FERRY UUCLEAR FIAN E
DOCiGT NO. 50-259 - FACILITY OPEPJLTING LICEU3E DPR AB OCCURREt!CE REPORT BFAO-50-259/758W The enclosed report in to provide details concerning diesel generator "A" which failed to start during performance of a routine surveillance test and is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973 Thic cvent occurred on Brouns Ferry Duclear Plant units 1 and 2.
Very truly yours, TI2DIESSEE VALLEY AUTHORITY uowy
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- 3. F. Thomas Director of Power Production Enclosure j
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Mr. Norman C. Moseley, Director U.S. Nuc M r Regulatory Commission Regional Office 230 Peachtree Street, NW., Suite 818 Atlanta, Georgia 30303 k
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l ADNOR!&L OCCURRENCE REFORT Report No.: BFAO-50-259/7583 Report Date: May 30, 1975 Occurrence Date:
May 21, 1975 Facility: Browns Ferry Unclear Plant units 1 and 2 Identification of Occurrence Diesel generator "A" failed to start during performance of a routine curycillance tect.
Conditions Prior to Occurrence The reactors were in the cold shutdown condition following the fire damage on March 22, 1975.
Description of Occurrence When an atte=nt was cade to start diesel generator "A," the solenoid valyc3on the No.1 bank of starters and on' the No. 2 bank vore activated normally and the pinion gearc engaged. However, the cultivano ctarting motors which drive the pinion gears en the No. 2 bank did not turn at all; and the No. 1 bank ctarting notors turned a few turne and then stopped. At this car.e tire, the solenoid valve on the Ho.1 ctarter bank would not reccat; and cince the pinion gears rc ained engaged, the air van drained from the air tank.
,Decinnation of Amarent Caune of Occurrence The four air starting motors were removed and disaccc= bled. The two starters from the No. 2 bank contained rust and oi.ly grit, and the vanen vould not move freely in the rotor clots. The two starters frca the No. 1 bank contained some ruct and grit, and the vanes vould not nove freely in the clots. The runt and crit verc evidently cauced by noisture in the air cystem along with inadcouate operation of the lubricator. The malfunction of the solenoid valve vac failure to reccat.
Analycin of Occurrence c
The abnormality occurred during performance of a periodic test, and the reactora ucre in a cold chutdown condition. There vere no adverse effcets to the public health and cafety or danage to cystems, components, or structures.
Corrective Action The air line straincra ucre cleaned, and lubricators were checked and filled with oil. All four ctarting motors were removed frem the unit and replaced with rebuilt starters. Alco, the two colenoid valves vere recoved, the seats cicaned, and reinctalled. The dieccl generator ras then started to ec=plete the curveillance tect. When the fast restart procedu c was atterpted, the diesel generator started, but the No. 1 starter bank pinion gearn did not disenganc. The solenoid valve was replaced with a sparc, and the diesel Generator started riatisfactorily.
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e grrectiveAction(continued)
Approved design changes have been issued which provide irroroved monitoring of the lubricator oil level; case of filling of the oil lubricator reservoir; and bloudown valves on the air supply line strainers and piping changes which help clininate condensato in the air system. These will be itzple:r.cnted when Ir.aterials are available, and the dicsc1 generators can be rc=oved from scrVICc.
Failure Data Diesel generator Ingersoll-Rand size 150BMP air starters; !!odel 289RH-49 Listed below are previous failure reports on the dicsc1 generators:
No.
Date 7347 12 6 73 7350 7
744 1
1 74 7413 3574 7419 32 74 7421 41 74
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