ML20085L630

AO 50-267/75/9:on 750404,valve HV-2188-8 Did Not Open When Circulator Seal Release Permissive Circuit Directed Valve to Open.Cause Not Stated.Air Solenoids Inspected & Cleaned

ML20085L630
Person / Time
Site:	Fort Saint Vrain
Issue date:	05/12/1975
From:	Brey H PUBLIC SERVICE CO. OF COLORADO
To:	Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
AO-50-267-75-9, NUDOCS 8311020139
Download: ML20085L630 (5)

Text

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, s public Service Comim,v W 0: 3 cm.t c-P. O. Box 361, Platteville, Colorado 80651 May 12, 1975 ..

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Mr. E. Morris floward, Director I Nuclear Regulatory Commission .

Region IV ./

'h Office of Inspection and Enforcement ., ,

611 Ryan Plaza Drive '*f a' <j' '"gr

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Suite 1000 Arlington, Texas 76012 REF: Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Iloward:

Enclosed please find one copy each of Abnormal Occurrence Report No. 50-267/75/10 and Unusual Event Report No. 50-267/75/9, finals, submitted per the requirements of the Technical Specifications.

Very truly yours,

,e ~p .if ts.1 s. . /

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11. Larry Brey Superintendent-Operations Fort St. Vrain Nuclear Generating Station 11LB:ll ec: Mr. Angelo Giambusso 9- a47.a '

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8311020139 750512 gDRADOCK 05000267 PDR 569/

CUPY SENTltEGION I

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REPORT DATE:  !!ay 7,1975 UNUSUAL EVENT OCCURRENCE DATE: _Ayril 4, 1975 FORT ST. VRAIN NUCLEAR CENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 PLATTEVILI,E, COLORADO 80651 REPORT No. 50-267/75/9 Final IDENTIFICATION OF OCCURRENCE: -

Valve HV-2188-8 did not open automatically when circulator seal release permissive circuit was in proper configuration for the valve to open.

The valve centrols are designed to function in this manner if a redundant solenoid in the control circuit were not to function normally.

This' item was not originc.11y reported but has been deemed reportabic by the Office of Inspection & Enforcement of NRC.

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:

Power Rtr. O FNth Elect. O IMc Secondary Coolant Pressure 300 psig Tenp:. ature 170 *F Flow 540,000 #/hr.

Primary Coolant Pressure 157 psig Terr.perature _171___ 'F Core Inlet 206 'F Core Out1ct Flow 0 #/hr.

All circulators nelf-turbiniun!

• i DISTRIBL'T!nNS ( )Unu';u;l

' Evint s and Abnormal Unusual Operating

• Monthly occurrence occurrence Cost Reports Reports Reports Letter Addresece San Francisco Operations Of fice ERDA 1333 Broadway Oakland, California 94612 2 2 2 -

Attnt Manager - - - 4 Finance & Budget '

1 1 - -

Calif. Patent Group Division of Reactor Research and Development ERDA Washington, D. C. 20545 1 1 1 -

Attnt Director - - 1 l Asst. Dir. for LMFBR Programs 2 2 2

- I Asst. Dir. for Cas Cooled Reactor Project 1 1 1 Asst. Dir. for Engrg. and Technology 1 1 1 Asst. Dir. for Reacter Safety '

1 1 1 1

ERDA -SCRPO-SD P. O. Box 81325 San Diego, California 92138 l 1 1  ;

W. Soule', Project Engr.

ERDA SCRPO P. O. Box 1446

• Canoga Park, California 91304 1 1 1

.ddress ++ Director

.. et tir ** ERDA -SCRPO to ++ P. O. Box 1446

++ Canoga Park, California 91304 3 3 Technical Information Center ERDA P. O. Box 62 Cak Ridge, Tennessee 37S30 10 10 2 ,

John W. Landis, President, Power Systems Co.

General Atomic Company P. O. Box 8160S San Diego, California 92138 1 1 Barbara Blick .

Bob Clark 1 1 1 R. Valker 1 1 F. Svart 1 1 1 L. Brcy '

D. Rodgers 1 E. 11111 1 F. Mathie 1 1

V. III11 yard 1 D. Alexander 1 J. Liebelt 1 K. Stannard 1 2

NRC, Director of Regulations, Vashingt on,D.C. 20545 1 (copy of 11ovard Ict ter & xcryx A dE'r.

'A. Cinnbunso ]

1 (Chaliman,NFSC) 0:. car Lcc 1 Contzol Eoou 1 D. Varenhourp, 1 E. 1toward

[]7let t er) copy of Irt t en to Clat:!

I R. Ayren (ITI.C Ic tter) 1 M. J. Cooney 1 Philadelphia r.lectric Company 1 1 2301 M.akct St. P02C Con.mittec PhilaJciphia, Pa. 18101 T~-~~

( l I l v ,1 Page two DESCRIPTION OF OCCURRI:';CE :

Circulator accumulator isolation valve llV-2188-8 did not open automatically when the proper circumstances were established during a start-up of circulator (C-2103) auxiliaries. The proper action is for the isolation valve (llV-2188-8) to open when the circulator seal is released in order to provide emergency bearing water upon loss of normal bearing water and back up bearing water to the circulator shaft.

APpAltENT CAUSE OF OCCURRENCE: Design Unusual Service Cond.

Including 1:nviron.

Manufacture Component Failure X Installation /Const. __

Other (specify)

Operator ,

l Procedure Cause of mal-operation was foreign particles in the solenoid valve stem area of one of the redundant solenoids of the valve pneumatic operator.

The source of the foreign material van apparently the piping of the air system cupplying the valve operator.

ANAhYSIS OF OCCURRENCE:

The valve did not open during the start-up of C-2103 circulator, per SOP 21-02 ntep 2.2.4.6-c; further start-up of the circulator was imm2diately i> topped. This occurrence did not in any way jcopardiac the safe operation of the circulator because S0p 21-02 (llelium Circulator Auxiliary System) was followed and as such no "C" circulator start-up continued a f ter llV-7188-8 mal-operat ion.

The design of the control circuit and pneumat ic supply through the control solenoidn of IIV-2188-8 is such that the valve will not open if one of the redundant nolenoids does not function. ILy administ rative control, further efforts toward putting the helium circulator into service is prohibited until the operation of IIV-2188-8 in corrected.

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• k U Page three CORRECTIVE ACTION: _

The air solenoids at the valve were both inspected and cicaned and the foreign particles removed from the valve operator solenoid valve stem area. No other corrective action is deemed necessary.

l FAILURE DATA /

SIMT1.AR REPORTrD OCCURRENCES:

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None PROGRA>DIATIC IMPACT _:

None i

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CODE IMPACT:

None Recommended: *Tb 'u' \\ Alu

11. Imrry Brcy  ;

Superintendent-Operations Fort St. Vrain Nuclear Cencrating Station /

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Approved: _g._ku.a.,

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F ederic ' . Swart uperintendent Nuclear Production ublic Service Company of Colorado

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