ML20039C632

LER 81-072/03L-0:on 811117,PCRV Rupture Disk M-11701 Setpoint Exceeded Tech Specs Limits.Caused by Belleville Washer Operating Point Drift.Disks Under Evaluation

ML20039C632
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/17/1981
From:	Fuller C PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20039C629	List: ML20039C628 ML20039C632
References
LER-81-072-03L, LER-81-72-3L, NUDOCS 8112290537
Download: ML20039C632 (5)

Text

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NRC FdRM M U. S. NUCLE AR REGULATORY COMMISSION

.17 77)*

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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7 LICENSEE CODE CON'T lol1l 7 8 REPO]lLl@l 3 ,

60 61 015OoCKET l 01010l NUMBER 2 l 617 68

@l1 EVENT 69 l1 11 DATE17 18 11 l@l1l2l1I7I8I1l@

14 75 REPORT OATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h Iot2l l During a maintenance shutdown while performine routine surveillance testine of PCRV l g o ,3,  ; rup ture disk M-11701, its setpoint was found to be 847 psig. This is outside the l

, o ,, , ; 832 psig i 1% allowed by Fort S t. Vrain Technical Specification LSSS 3. 3. I lo isl l Table 3.3.1.2(c) and is being reported per Fort St. Vrain Technical Snecification l

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Re dundant rup ture disk M-ll702' in service and operable. Th'e re was n o I IO le i I AC 7. 5. 2 (b) 1.

o g 7 9 ; ef fect on plant operation. No e f fe ct on p ublic he alth or s afe ty. Similar report  !

,g,g, ; R0 80-49 and RO 79-15. l C DE CO E SLSC E CCYPONENT CODE SUS OE S E 10691 I cl Al@ Lxj@ I z l@ Ix lx lx lx lx lx l@ LzJ@ LzJ @ 13 18 19 20 7 8 9 10 11 12 SEQUENTI AL OCCURRENCE REPORT REVISION EVENT YE AR REPORT NO. CODE TYPE N O.

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44 47 CAUSE DdSCRIPTION AND CORRECTIVE ACTIONS g3 g o ; l The rupture disk se tpoint being out of tolerance was caused by drif t of the Bellevillel washer ope rating point. The snap-over test was conducted three times with the last 1 g, ,, ,

y two of the tests within the required setpoint band. Evaluation of the rupture disks l g

is being conducted, and results will be included in a future supplimentary report. l I

11 6411 80 7 8 9 STA  % POWER OTHER STATUS IS O RY OISCOVERY OESCRiPTION l

l' is t l G l@ l 0] 010lhl N/A I I Blh! Scheduled Surveillance Test ACTIVITY CO TENT aELEASEO npRELEASE AMOUNT OF ACT"41TY LOCATION OF RELEASE l1 ls8 9l W h W@l N/A l l N/A I 7 10 11 44 45 80 PERSONNEL EXPOSURES NUYSER TYPE DESCRIPTION l

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PERSONNEt mu'R'iES NUveER OESCmPTiON@

_l lt la 8l 1010 7 9 l 0 l@l N/A 11 12 80 LOSS OF CR DAMAGE TO FACILITY TYPE DESCRIPTION N/A I li 191 l z i@l sue IlCR,PTiON@ hbMMfoQg7- NRC USE ONLY L3_LJ LF_S81 N/A pM i lIIIIIIIIIIII2 NAME OF PREPARER / - 4 PHONE:

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