ML20085M702
| ML20085M702 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 07/21/1975 |
| From: | Hillyard H, Mathie F, Swart F PUBLIC SERVICE CO. OF COLORADO |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| AO-50-267-75-16, NUDOCS 8311090176 | |
| Download: ML20085M702 (5) | |
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P. O. Box 361, Platteville, Colorado 8065
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.4 July 21, 197 Mr. E. I! orris l'ouard, Director Nuclear Regulatory Commission Region IV Office of Inspection and Enforcenant Suito 1030 Arlington, Teras 76012 Ref: Facility Operating License No. DPR-34 Docket No. 50-267
Dear 'Ir. IInvard:
Enclosed picace find a copy of Abnormal occurrence Report No. 50-267/75/16, Final, aubmitted par tha. requiretrnts of the Technical Specifications.
Very truly yours, Frederic E. Svart Superintendent nuclear Production Fort St. Vrain liucicar q
Generating Station FES/nik
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cc: ifr. Angelo Gianbusso 8311090176 750721
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-h REPORT DATE:
July 16, 1975 ABNORMAL OCCURRENCE OCCURRENCE DATE:
Discovered June 10, 1975 FORT ST. VRAIN NUCLEAR GENERATING STATION
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PUBLIC SERVICE COMPA PI 0F COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651 1
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REPORT NO. 50-267/75/16 3
Final 2
e IDENTIFICATION OF i
OCCURRENCE:
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When engine B (K-9204X),of standby generator set A was disassembled to
. l che*ck for possible damage due to overspeed, (see Abnormal Occurrence 50-267/75/14). No damage attributable to overspeed was found.
Broken rings, scored cylinders and cracked pistons were found.
Examina-tion of,the other three engines revealed similar damage. The other engines'had not been oversped.
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C0!OITIONS PRIOR TO OdCURRENCE:
Steady State Power Routine Shutdown Hot Shutdown Routine Load Change X
Cold Shutdown Other (specify) 3 Refueling Shutdown Routine Startup
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The major plant parameters at the time of the event were as follows:
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Power Rtr.
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Elect.
O MWe Secondary Coolant Pressure 1160 psig Temperature 215
'F Flow 145,000
- /hr Primary Coolant Pressure 351 psig
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Temperature 175
'F Core Inlet 187
'F Core Outlet Flow-305,000 f/hr.
(Conditions on May 30, 1975, date of Abnormal.0ccurrence 50-267/75/14).-
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DESCRIPTION OF OCCURRENCE:
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Damage discovered when engine B (K-9204X) opened for examination.
4 A cracked piston, broken pisc.on rings and marked (lightly scored) cylin-y der liners were fou:id.
This de a;c was not attributable to overspeed.
Examination of the other 3 engines (which were not oversped) revealed similar damage.
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All engines were being tested regularly.and carrying their rated load.
APPARENT CAUSE OF OCCURRENCE:
Design I
Unusual Service Cond.
Including Environ.
Manufacture Component Failure Installation /Const.
Other (specify) 1 h
Operator s,
-L Procedure Cylihder liners showed water marks, indicating wate.r' presence in the engines
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before installation in the plant and before initial startup.
The broken rings, cracked pistons and marks on the cylinder liners were due to this water being present on initial startup.
There is no evidence that any gaskets were leaking to cause water inleakage, and there is no mechanism for introducidg this amount of water to the edgine
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through the exhaust system.
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ANALYSIS OF OCCURRENCE:
Water entered the engines during their outside storage before initial installa-tion.
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CORRECTIVE ACTION:
All 4 engines were inspected in the presence of a manufacturers representative.
Pistons, liners and rings were repinced, as required.
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t' FATLURE DATA /SIMILAR
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UJ REPORTED OCCURRENCES:
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9 PROGRAMMATIC IMPACT:
None CODE IMPACT:
None d
Recommended:
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Reviewed:
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H. W.111118(rd F. M. Mathie Technical Services Supervisor Superintendent-Maintenance Fort St. Vrain Nuclear
. Fort St. Vrain Nuclear Generating Station Generating Station A
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Approved:
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i F/ederic E. Swart Superintendent Nuclear Production Public Service Company of Colorado 4
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k3 public service company oa' Cdoirado N
2 P. O. Box 361, Platteville, colorado 80651 j,
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?r July 28, 1975
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Mr. E. Morris lloward, Director Nuclear Regulatory Connission Region IV Office of Inspection and Enforcement Suite 1000 Arlington, Texas 76012 Ref: Facility Operating License No. DPR-34 Docket No. 50-267
Dear Mr. Iloward:
Enclosed please find a complete copy of Abnormal Occurrence Report No.
50-267/75/16, Final. We understand the copy we forwarded on July 21, 1975, did not include Page Two of this report.
Very truly yours,
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Frederic E. Swart Superintendent Nuclear Production Fort St. Vrain Nuclear Generating Station FES/alk A
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