ML20086E769
| ML20086E769 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 10/09/1972 |
| From: | Walker R PUBLIC SERVICE CO. OF COLORADO |
| To: | Kruesi F US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086E708 | List: |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8312070514 | |
| Download: ML20086E769 (3) | |
Text
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r 3p\\p public Servlee Company *2 CoHorado k
P.O. BOX 840 DENVER, COLORADO 80201 e;n
.J October 9, 1972 Mr. F. E. Kruesi Directorate of Regulatory Operations United States Atomic Energy Commission b d
'cN"1 y Washington, D. C.
20545
SUBJECT:
Deficiency Report 10 CFR 50 Diesel-Generators Emergency Electrical System Fort St. Vrain Station
Dear Mr. Kruesi:
Pursuant to the~ reporting requirements of 10 CFR 50, Part 50 55, we are submitting herewith, as an interim report, twenty copies of the subject report involving the Diesel-Generators at the Fort St. Vrain Station.
We trust the attached report will provide you with sufficient information and will fulfill the requirements of an interim report under 10 CFR 50 regulations.
Very truly yours, W $d W j
R. F. Walker, Vice President Engineering and Planning Electric Department RFW/FES:11 cc:
Mr. John Flora Director, Region IV Denver Cs 8312070514 730439 DR ADOCK 05000267 PDR
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i DEFICIENCY REPORT 10 CFR 50 - Part 50.55 Facility: Fort St. Vrain Nuclear Generating Station
Subject:
Standby Diesel-Generators Date:
' October 1972 4
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General' Conditions-.,
.On Thursday, September 7, at approximately'll:30 A.M, Engine K920hX ( ebgine) o!r "A"' Diesel-Generator set' was started for test, after being moved back inth pobiti'on following' generator repairs and maintenance, Prior to starting the Diesel-Generator: unit, the water jacket vas refilled in the normal manner until a water level was established in the head tank.
After-some 40 minutes operation,La-spray of diesel fuel was noticed coming from the area of the right front cylinder. The, engine was shut down. At the time-of t'lutdown the cooling vater head' tank showed a proper coolant level, and. the water temperatui*e indicator -
had a normal reading, although the engine.-seemed.to be'very hot when:
it vas. shut down.
Cause Determination and Result' ant Damage i
Maintenancepersonneldeterm1ned'thatexcessive;heathad-softened an;"0" ring 'on the, injector for the right ' front! cylinder and~_
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the "0" ring'had failed. Some 2'O odd minutes after shutting-the. unit
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down, the : level in the' cooling water. surge, tank dropped;as ' water ran
- 4 into the engin'e,.~ indicating thatlthere had bien an airilock in^ the' -
a engine,'and a portion 'f.the. cylinder heads'waslvithout/ coolant, j
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' including.the area containing.the water temperature sensor.:
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A Caterpillar Company service man supervised the removal of the right cylinder head'on September 14 and determined that no further heat damage had occurred.
He also confirmed that air locks were a known hazard in this parkicular, engine.
A positive means of determining the temperature in the upper areas and/or preventing air locks in the cooling system has been requested from Caterpillar. Their reply is expected shortly.
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