ML20085M473
| ML20085M473 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 02/06/1976 |
| From: | Hillyard H PUBLIC SERVICE CO. OF COLORADO |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML20085M459 | List: |
| References | |
| NUDOCS 8311080593 | |
| Download: ML20085M473 (1) | |
Text
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O kV INF0 MASTER PUB SER CO DN 0328520037 1812FST 003 DENVER, COLORADO FEBRUARY 6 ZIP 76012 E. MORRIS HOWARD RFGION I V, RFGUL ATORY OPFR ATION NUCL FAR RFGUL ATORY COMMI SSION ARL I N GTON, TFXAS 76012 ON 2-6-76, kHILE CONDUCTING THE kEEKLY SURVEILL ANCE TEST OF DI ESEL GENERATOR SET l - P, TH F GFNERATOR LOAD PREbXER COULD NOT BE CLOSED.
TH I S TS I DFNTI FI ED AS ABNOFM AL OCCUR ANCE 76/03 FER FORT ST. VRAIN TECHNICAL SPECI FICATION 21, PARAGRAPH F.
ON 2-6-76, DURING THE kEEKLY SURVEILL ANCE TES1 0F DIESEL GENERATOR SET 1 A, A DIFSFL GENERATOR SET 1 A TROUBLE ALARM k AS RECEI VED IN THE CONTROL ROOM.
AN INVFSTI GATION REVEALED EN GINE IB HAD PARTIALLY DISCONNECTED FROM THE GENERATOR.
THI S I S I DFNTI FI ED AS ABNORM AL OCCUR ANCE 76/04 PFR FORT ST. VRAIN TECHNICAL SPECIFICATION 21, PARAGRbPH F.
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FORT ST. VRAIN NUCLFAR GFNERATING STATION PUPLIC SERVICE COMPSNY OF COLORADO P.O.
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'a REPORT DATE February 13, 1976 ABNOPJfAL OCCURRENCE 76/04 Page 1 of 3 OCCURRENCE DATE February 6. 1976 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P.O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT No. 50-267/76/04 Preliminary IDENTIFICATION OF OCCURRENCE:
The clutch on "B" engine 1A Standby Generator moved in the declutch direction under load. This is identified as an abnormal occurrence per Section 2.1, paragraph (f) of the Fort St. Vrain Technical Specifications.
i CONDITIONS PRIOR TO OCCURRENCE Steady State Power Routine Shutdown Hot Shutdown Routine Load Change X
Cold Shutdown Other (specify)
Refueling Shutdown Routine Startup The major plant parameters at the time of the event were as follows:
4 Power RTR 0
Wth ELECT 0
We Secondary Coolant Pressure 15.
psig Temperature 70
- F Flow 75000
- /hr.
Primary Coolant Pressure 159 psig t-Temperature 86
'F Core. Inlet 86
- F Core Outlet Flow 0
f/hr.
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ABNORMAL OCCURRENCE 76/04 Page 2 of 3 DESCRIPTION OF l
OCCURRENCE:
The 1A Standb Diesel generator diesel engines had been locally started and the generator loaded to 50% per the weekly surveillance procedure. The standby generator set continued in operation for approximately one hour when a Standy Generator Trouble alarm was rsceived in the main control room. The operator went to the standby generator roomand discovered the clutch arm had moved slightly in the declutch direction and actuated the switch.
Load was reduced to 25% and f
the engine was declutched and the tcat was ccmplete.
APPARENT CAUSE OF OCCURRENCE:
Design Unusual Service Cond.
Including Environment Manufacture Component Failure 1
(
Installation /Const.
X Other (specify)
Operator Procedure The force required to engage the clutch was out of tolerance.
ANALYSIS OF OCCURRENCE:
In this instance, the clutch was engaged and later disengaged under load. A check of the clutch engaging force was made and found to be in excess of 225 pounds. It should have been between 155 and 204 pounds. The clutch mechanism force had been adjusted on January 12,1976, per PM 92.10 quarterly inspection. This was the first operation of the diesel generators under load since that inspection.
It has not yet been determined why the engaging force was excessive. The surveillance procedure 5.6.ld-M (Diesel Engine Exhaust Temperature Functional Test) was com-pleted before the 50% load test. This procedure requires the clutch to be operated and the low temperature declutch verified.
CORRECTIVE ACTION:
The solenoid valve was cleaned and checked for leakage and reinstalled. The clutch pressure has been readjusted to 190 pounds engaging force. The clutch mechanism will be disassembled and thoroughly examined for any possible mechanical ~ problems.
FAILURE DATA /SIMILAR REPORTED OCCURRENCES:
Abnormal Occurrence 50-267/74/23 concerning Engine 1A.
Similar occurrence but different cause.
PROGRAMMATIC IMPACT:
None
. -. - - - - - _ _ _ ~. - - _ - _.. _. _ _ _. _ _. _ _ _. _ - _ _ _ _ _ _ _
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t O
o AENORMAL OCCURRENCE 76/04 Page 3 of 3 t
.O CODE IMPACT:
None i
Submitted by-Yl!W.'Hillygd, Jr.
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Technical Services Supervisor 1
[3-tLLLt4(,
Reviewed by:
uv, a Duane Lambert Supervisor, Plant Electricians 4
Reviewed by:
S Frank M. Mathie
,, Superintendent, Maintenance
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Approved by nu a >,, n,
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FfedericE. Swart Superintendent, Nuclear Production r
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