ML20086B459

AO 50-267/74-13:on 740707,excessive Loss in Static Seal Actuator Pressure for Helium Circulator a Observed.Cause Unknown.Circulator Will Be Replaced

ML20086B459
Person / Time
Site:	Fort Saint Vrain
Issue date:	07/11/1974
From:	Brey H, Rodgers W PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20086B449	List: ML20086B446 ML20086B452 ML20086B453 ML20086B459
References
AO-50-267-74-13, NUDOCS 8311170243
Download: ML20086B459 (3)

Text

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10RT ST. VEI:! I;UCLI:AR GE ISRATil:G ST/. TION PUnblC SP.nVICI CO':PANY OF' C01 ORADO P. O. J:0X 361 PLATTEVILLls, COLOil.4J)0 80651 -

REPonT 1;0. 50-267/74/33 Prelhainary 1DE!TlPIC.\TIO:; 0F OCCUnn':':CE :

The fo11ouing is considered an Abnormal Occurrence under definition 2.1 e of the Technical Specifications. -

On July 7, 1974, excessive loss in the static ccal actuator pressure for "A" Helium Circulator was observed.

CO:iDITIO::S PRIOR TO _OCCURni.:;CE: Steady State Poucr Routine Shutdown llot Shutdown Routine Load Chanr,c Co.La Clautcoun A Ottier (specity)

Refueling Shutdown Reactor shutdown with PCRV Routine Startup at attonpheric pressure

- The major plant parameters at the time of the event were as follows:

Pouer PTR N/A M.'t h Elect. n/A MWe Secondary Coolast Pressure M]A psig'

Temperature N/A 'F i

Flow N/A #/hr.

l Primary Cool.mt Pressurc 0 psig Temperature 175 *F Core Inlet t

125 *F Core Outlet 8311170243 741022 PDR ADOCK 05000267 PDR S Flow 0 #/hr.

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DESCRIPT10:1 0F

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OCCUimi:::CI;:

s I On July 7, 1974, an excensive increase in the bleed off rate of t.he helium gas bott.le nuppl:/ing the ntatic neal. nctuator on "A" helium  !

1 c.irculator was observed. .

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i Suhacquent. Jeak checkinr, on tLiu tiystem.indleates thaf the leakage  !

point is internal to the nachine.  ;

i APPARimr CAUSE OF l OCCUl RITC F. - Design Unusual Service Cond. . i lucluding Pnviron. j P

Manufacture Component Tailure I l

Installat lon/Const . X Other (specify) )

. l Operator See belov - ,

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l Procedure -

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' The cause of this failure in presently unkum.n. Preparations are currently  ;

underucy to remove this heliu,n circulator nr.3 r . place it with a spare unit. ,

j Af ter rcnoval of "A" hallua circulat.or the static seal mechcnion vill bc l Jnspected to detemine cause of. the fai. lure. -

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!.':!.h'1CIC Or OCCUPJu:::CF.:

l The r.Latic seal act.unting ncchanic.m vill be inspected after renoval of the i i helium circulator.  !

i l - CORRECTIVE '

i ACTIO"- '

4 The circulator uith the defective static scal actuating mechanicm vill be  ;

replnced with.a cparc. unit.  :

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! _TAILURE DATA /ST 11LAR RFPORTFD OCCURRD;CES: . I This node of static seal failure han not occurred before. The subject of ,

Abnornal occurrence #50-267/74/10 ddted June 3,1914, vas leakage of l l - prJmary coolant by tt' static seal on "B" Hell'um Circulator due to '

l- particulate natter betueen the scaling surfaces. . Thecc tuo types of i i failure are not considered similiar. '

~

l PROGRA'MATIC IMPACT.

Approxiantely.35 days are rcquired to completely change. out a helium circulator, ,

Due to our present schedule this circulator change out will delay the overall testing program approximately two v!cks.

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