ML20086B459
| 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: |
| References | |
| AO-50-267-74-13, NUDOCS 8311170243 | |
| Download: ML20086B459 (3) | |
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Ju]y i g ]974 An!!O:UIAL OCCiiR"I";CE g.7 7,
1 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 S
PDR Flow 0
- /hr.
e e
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.rke r e
DESCRIPT10:1 0F
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OCCUimi:::CI;:
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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.
i j
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
I Manufacture Component Tailure l
Installat lon/Const.
X Other (specify)
)
l Operator See belov j
i l
Procedure l
t
' 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.
Af ter rcnoval of "A" hallua circulat.or the static seal mechcnion vill bc l
j Jnspected to detemine cause of. the fai. lure.
l
!.':!.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.
i
_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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