ML19340B272

LER 80-049/03L-0:on 800904,PCRV Rupture disc,M-11702, Setpoint Set at 826 Psig Rather than 812 Psig.Caused by Drift in Belleville Washer Operating Point.Threaded Ring Adjusted Until Rupture Disc Actuated at Correct Setpoint

ML19340B272
Person / Time
Site:	Fort Saint Vrain
Issue date:	10/01/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19340B263	List: ML19340B262 ML19340B272
References
LER-80-049-03L, LER-80-49-3L, NUDOCS 8010210719
Download: ML19340B272 (1)

Text

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ARC FO;M 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77) .

.Lj,q LICENSEE EVENT REPORT CONTROL SLOCK: l l l l I l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 10111 7 8 9 lC LICENSEE 10 l FCODE l S lV l1 l@l0 l0 l- l0 14 15 l0 l0 l0 l0 l- l0 l025l@l4 LICENSE NUM8ER 26 l1LICENSE l1 l2TYPE l0Jol@l57 CAT l 68 l@

CON T IOl'l

? 8 c Rc 60I L l@l 61 0 l 5 DOCKET l0 l 0NUMBER l0 12 l 6 68l 7 @l0 69 19 10 l4 l8 l0 EVENT DATE 74 l@ll 75 10 lo l1181080l@

REPORT O ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Io12l lDuring a maintenance shutdown, while performing routine surveillance testing of PCRV l

[o i3; l rupture disc, M-ll702, its setpoint was found to be 826 psig. This is outside the l Io (4 l l812 psig 1% allowed by Fort St. Vrain Technical Specification LSSS 3.3.2(c) and is l 1o isl Ibeing reported per Fort St. Vrain Technical Specification AC 7.3.2(b)1. The reactor l lO Is l lhid not been overpressurized during this surveillance interval and there was no ef- l l 0 l 7 l l feCt on plant operation. No effect on public health or safety. Similar report J gai3!lR0 79-15. l 30 7 8 3 CE CC E SL SC E COVPONENT CODE SUSC dE 5 E 10491 7 8 l C l A l@ lX l@ lZ l@ l Xl Xl Xl Xl Xl Xl@ l Z l@ l Z l@

9 10 11 12 13 18 19 20 SEcV ENTI AL OCCU A R E NCE aEPORT 4 EVISION EVENT vEAR R EPORT No. CODE TYPE NO.

@ ltga gat no l8 10 l l-l l 0l 4l 9l l/l l0l3l lLl l-l l 0l

,21 22 23 24 26 27 23 29 30 31 J2 TAK N A CN o PLANT ME MCURS S8 iT 80R h 8. SU PLIE MANUPACTURER lE l@lz l@ l;>z l@ Iz l@ l 0l 01 01 01 IYl@ l42N i@ l43Nl@ l44 Cl ol 216l@

JJ 04 M 31 40 43 47 CAUSE CESCRIPTION AND CCARECTIVE ACTIONS h l j a l l Ruo ture disc movenent setpoint out of tole rance due to drif t of the Belleville washer I i, , . ; ; operating point. The threaded ring holding the Belleville washer was adjusted until l

1. 1 l2l l the rupture disc coerated at the correct setooint. No further corrective action is I l i i 31 l anticioated or recuired. I l i 141 l l 7 8 9 80 STN'  % PCWER OTHER STATUS dis O RY DISCOVERY DESCRIPTION I1 4 5 l l G l@ l O! 0l 0l@l N/A l lB l@lScheduledSurveillanceTest l ACTIVITY CC TENT RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE i l1 i s8 9l l Z l @D OF RELEASE l Zl@l44 N/A 'S l l N/A l 7 10 11 80

1. ERSONNEL EXP >SURt3 NUMBER TYPE CESCRIPTION l 1 l 71 l 010 l 0 l@l Z l@l N/A' '

l

,ERScNN E L IN2unS NuM8ER cESCPIPTION@

l l1 la 3l 2l 0 l 0 l 011l@l12N/A 80 7

LOSS OP CR DAMAGE TO FACILITY TYPE DESCRIPTION l

l i l 98 l9l Z l@l10 N/A 7 30

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