ML19224D585

LER 79-013/03L-0 on 790412:during Test of Snubbers Many Found Inoperable Due to Unacceptable Lockup & Bleed Characteristics.Caused by Setpoint Drift,Dirty Oil & Clogged Valves.All Snubbers Repaired & Adjusted

ML19224D585
Person / Time
Site:	Fort Saint Vrain
Issue date:	07/03/1979
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19224D582	List: ML19224D581 ML19224D584 ML19224D585
References
LER-79-013-03L, LER-79-13-3L, NUDOCS 7907120663
Download: ML19224D585 (1)

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(7 77)LICENS,iE i"v TNT REPORT CCNTROL BLOC s l llllll(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) i e oli (_C l 0 l F l S I V l 1 Ql 0 l 0- l0 ,l010 l@l 411 l1 12 l 0 l@l ll@0 10 0 10-7 d 3 LICENSEE COCE 14 15 LICENSE NuvdER 25 26 LICENSE Tv et JO h7 Gr :8 CCN'T 0% lL @ 0l5l0l010l2l6l7 @l0lal1l2l719 @l0l7l0l317l9 @

0I'd 60 61 GCCK ET NLv6ER 68 63 EV ENT D ATE 74 75 RE8 CAT OATE 60 EVENT DESCRIPTION AND PROS A8LE CCNSECUENCES h

[TTTl l .During functional test of hvdraulic shock sucotessors ( snubbe rs).any were f ound to I a,3l be inoperable. The snubbers had not been tested since installation and nust be 1 o 64l assumed to have been inoperable while the reactor was at power contrarv to I.C0 4. 3.10 1 jnubberswere found to be inopenble due to unacceptable lockuo and/or unacceptable lo,s[ bleed characteris tics.

Reportable per Fort S t.

Vrain Technical Specification, Section t 0 is 317l AC 7.5.2(b)2.

Thr.re was o effect on pualic health and safety.

l;a, I l 7 3 3.$J SYSTEM CAUSE CAUSE CVU8 VA LV E COCE COCE S' '8 C0 0 E CC*tPONENT COCE SLSCOCE SL6COCE ( Z i Z I@ 121@ 13163) IS I" Ip 10 IR IT l@ I DI@ I Zi@

a 3 9 10 11 12 12 to 13 20'.SECUk MAL OCOLAAENCE AEPORT"EVIS3ON ,,_EVENr VEAR H E*0HT NO.

000E TYPE NO.@ .*gg a ao i7 19 l[- , lJ l1 l 3 l l/ll 0l 3llLll-ll0 lE,'y ,7_:i:::" 24 26 27:s 29:s ai 22 ACTION ruTuaE EF8ECT S a V T OCV.N ATT AC v5NT N P A O-4#AtVE CCMP COvp0NENT sLeviT to scam wS.SUP8U E A MANLFACTLAEA TAKEN A CT r C N CNPLANT VET Oc-cLpS..lDl@!Zl@l 2 l@lZ @il0 10 ullYl@lN l@l Al@lI l2l0l7l@

2;24 a,.o 3-o*i 42 43 u 47 CAUSE DESCRIPTION AND LCR AECTIVE ACTICNS h l-0l The caus:. of the failure of the snubbers to have acceotable lockuo and bleed charac-llteristics was setpoin: drift, dirty oil, and clogged valves. These snubbers sre IT7- 1

, i Grinnel snubben of various sizes and models.

All snuFbers tested were repaired /re-

], , , ,3l adjus ed p rior to reins tallation.

lla!!.'7 3 3 80-F ACILi*v v VETwCO CF STATa5 N POWE A oT*ER STATUS

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