ML20085L787

AO 50-267/74-25:on 741018,diesel Engine B of Standby Generator a Tripped from High Water Jacket Temp on Routine Test.Caused by Improper Filling of Water Jackets.Personnel Counseled

ML20085L787
Person / Time
Site:	Fort Saint Vrain
Issue date:	05/07/1975
From:	Brey H PUBLIC SERVICE CO. OF COLORADO
To:	Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
AO-50-267-74-25, NUDOCS 8311020448
Download: ML20085L787 (3)

Text

,

1 P. or Box 361, Platteville, Colorar!o 80651 l

I Gy tol19 May 7, 1975 P.r. E. 'forric Howard. Director Tuclear reculatory Corr.irolon

?ccion IV Office of Inspection and F.nforcenent 611 Ryan Pinza Prive Suito 1030 Arlincton, Texas 76012 REF: Facilit / Operating License No. DPR-36 Doelet No. 50-267 De$rMr.thward-rneloced plence fin:1 a copy of Al'nor nl Occurrence % port 50, 50-267/74/25 Finni, subr.itted per the re::uirer.cnts of the Technical Frecificatiene.

Very truly yours, H. Larry Prey Superintendent-Operatione Fort St. Vrain Nuclear Cencrating Statica Ult:il 8311020448 750507 ~.

PDR ADOCK 05000267 8 PDR Elsa

' ~~

O REPORT DATE: May 2, 1975 ABNORMAL OCCURRENCE OCCURRENCE DATE: October 18, 1974 FORT ST VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/74/25 Final IDENTIFICATION OF OCCURRENCE:

On a routine test following maintenance,/ diesel engine "B" of standby generator "A" tripped from high water jacket temperature af ter approx-imately 15 minutes running.  ;

This has been identified as an Abnormal Occurrence, as per Section 2.1, paragraph f. of the Technical Specifications. This occurrence has been deemed reportabic by Region IV, office of Inspection and Enforcement.

CONDITIONS PRIOR TO OCCURRENCE: O Steady State Power Routine Shutdown 0 llot Shutdown Routine Lond Change X Cold Shutdown Other (specif y)

Refueling Shutdown Routine Startup The r:ajoi plant pararacters at t he time of the event were as follo.m:

Power Rtr. tn1th Elect. _ Pnfe Secondary Coolant Pressure Atmos. psip, Ten.pera t u re 100 *F

. Flow 0 #/hr.

Prin.iry Cool:mt Prensure ___, _ A t qop_ __ ,_ _ _ pair, Tee:isera t u s . 103 ,_ ,

• P Core lulet 100 *F Core Outlet Fjow 0 f/hr.

) ( ; '

'"' L

, Page 2 DESCRIPTION OF OCCUPRENCE:

Units were being run to check operability af ter a 6 months PM inspection.

After starting, loading, and running approximately 15 minutes, engine "B" of "A" generator tripped off on cooling water overtemperature.

A Plant Trouble Report was issued and the generator, with both A & H engines, run successfully at 700 RW for approxima'tely 30 minutes, on the follouing morning.

Prior to running the cooling water surge tanks were topped of f as per nornal procedure.

APPARENT CAUSE OF OCCURRENCE: X Design Unusual Service Cond.

. Including Environ.

Manufacture Component Failure Installation /Const. Other (specify)

Operator X Procedure After draining for maintenance, the water jackets sometimes require two or three topping off's between runs to climinate all air pockets and raise the coolant to its proper level.

This is norrally done under a " test" provision on the clearance card before the unit is returned to service by clearance surrender.

Eccause the tradesman van going off shift, he ' surrendered the cicatance, leaving the operator to conduct the final coolant fill and purging. On the maintenance man surrendering the clearance, the operator noted t he units as being returned to service. This vas an error on the part of the tradesnan.

ANALYSIS OP OCCURRENCF*

The water jackets were not properly fil. led , m per procedure. The operator was cartying out the proetdure uhen the unit tripp d. The diesel .hould still have been carried as under te.:t, not in neivice.

00nni.CTIV!

ACTitC.

Tradesmen havt been advi::ed not to su r i eut'er c l ea r.in: er, r i l hou t p ropc i-t est int, of na i: .

.