ML20085L651
| ML20085L651 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 03/07/1975 |
| From: | Brey H PUBLIC SERVICE CO. OF COLORADO |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| AO-50-267-75-8, NUDOCS 8311020212 | |
| Download: ML20085L651 (9) | |
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pubile service company ore celerade P. O. Box 361, Platteville, Colorado 80651
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E. Morris Howard, Director U. S. Nucicar Regulatory Com:nission
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Office of Inspection & Enforcement Region IV 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012
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On 2/24/75, while running the weekly surveillance tests on the emergency diesel generators, "B" engine of the "A" diesel-generator set failed to operate normally due to.a faulty exhaust temperature thermocouple.
C Frederie. E. Svart.
Supt. Nucicar Production'
- Fort St. Vrain Nuclear' Generating Station j
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I:EPORT DATE:
March 4 1975,_
ABN0!U4AL OCCURRENCP.
u OCCURKENCE DATE: Februa ry 24' 1975 y.
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FORT ST. VRAIN NUCLI%R GENERATING STATION PUBLIC SI:RVICE COMPANY OF COLORADO r
P. O. l'OX 361 d i L.!.'.-
PLATTEVII.LE, COLORADO 80651
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s REPORT No. 50-267/75/8 Final C
l IDENTIFICATION OF OCCURRENCE:
On February 24,1975, "B" diesel engine of "A" standby generator failed to function properly during a veckly surveillance test.
The engine started, ran for approx-imately 20 seconds, then shut down.
This is defined as an Abnormal occurrence as per definition 2.1.f) of the Technical Specifica<_fon.
CONDITIONS PRIOR
, steady State Poewr-
, Routine Shutdown tu uccusau.cr.:
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 fo))ows:
Power Rtr.
O MWth Elect.
O MWe Secondary Coolant Pressure 260 psig Temperature 68
'F
. Flow 18,000 ~
- /hr.
Primary Coolant Pressure Atmospheric
'psig
'p d Temperature 100
' 'F' Inlet.
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I-100
- F Outlet
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Flow 0
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l DESCRIPTION OF
.O..C_CURR_ ENC E :_ _ _ _
During SI; 5.6.1 a-w, weekly test ing of the it andby d iesel generating units, engine B of A generator, started, ran for approximat ely 20 seconds, then shut down and declutched.
A second, immediate attempt to start the engine was unsuccessful.
Exhaust temperature indication for li engine showed no increase during the 20 second run.
APPARENT CAUSE OF OCCURRENCE:
Design
_ _ Unusual Service Cond.
Including Environ.
_ Manufacture
_X
_ Component Failure
_ Installation /Const.
,,_ _ __ Other (specify)
Operator Procedure The exhaust temperature thermocouple had failed, and therefore showed no tempera ture increase.
The control system saw this as a failure of the engine to start, and therefore, shut the engine down and declutched it, en prouane A -nging re-g-7ggi g 2 : pperedly g2:2 inn,
i ANALYSIS OF
.O._C_.CURRESC E :
At tempting to run S.R. 5.6.1-a-w, "B" engine on the "A" diesel-genera tor unit shut down after 20 seconds.
Electrical inspection revealed that the exhaust temperature thercocouple was defective.
These exhaust temperature
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thereccouples cust show high temperature in the exhaust system for a "Go" in the process of starting the units.
However, the thermocouple was not open but failed to produce the necessary millivolt output to drop out the tcaperature relay, which resulted in a declutch and trip of the "B" engine.
All alarms associated with the trip operated norrdilly.
CORRECTIVE ACTION:
PTR 2-350 issued.
'A new exhaust temperature thermocouple was installed, and a program initiated on the preventive maintenance program to change out all thermocouples on the diesel-generator units on an annual basis.
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Fall.URE DATA /
SIMILIAR REPORTED OCCURI:ENCES:
None.
Other thermocouples have becu changed in the pant, but because of suspected deterioration, not complete failure.
PROGRABIATIC I?1 PACT:
None CODE IMI'ACT:
I None Recommended:
Approved:
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Frank M. 'fathic Frederic E.
Swart Superintendent-Maintenance Superintcudent Nuclear Produetion Fort St. Vrnin Nuclear Public Service Company of Colorado Cencrating Station e
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r A Thoned to 1,ois-Grico, Extension 7750, 2/24/75, at
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E. Morris Howard, Director U. S. Nucicar Regulatory Commission Office of Inspection & Enforecaent
-Region IV 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 On 2/24/75, while running the veckly. surveillance tests on the emergency diesel generators, "B" engine of the "A" diesel-generator set failed to operate normally due to.a faulty exhaust temperature thermocouple.
Frederic E.
Swart Supt. Nucicar Product.icn Fort St. Vrain Nuclear Gc.4 crating Station 3
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