ML19256G026

LER 79-064/03L-0:on 791124,torus-to-drywell Vacuum Breaker Found Inoperable.Caused by Swollen Teflon Shaft Bushings. Bushings Machined to Required Clearance & Study Initiated Re Applicability of Teflon as Bushing Material

ML19256G026
Person / Time
Site:	Dresden
Issue date:	12/21/1979
From:	Dunbar J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17174A286	List: ML17174A285 ML19256G026
References
LER-79-064-03L, LER-79-64-3L, NUDOCS 7912270265
Download: ML19256G026 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSloN (7 77) t LICENSEE EVENT :t) ORT

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7 8 60 61 DOCKET NUVSER 68 69 EVENT O ATE EVENT DESCRIPTICN AND PRCBABLE CCNSEQUENCES oi2 During steady state operation, torus to drvwell vacuum breaker 2-1601-32F was found l o 3i l inoperable during routine operability surveillance. 2-16G1-32F was secured in the l 3 i .; closed position and normal operation continued since 11 (9 required) vacuum breakers l Similar 3 5i l were operable. As a result, this event has minimal safety significance. l o e ] events:

50-237/77-77, 50-237/78-3, 50-237/74-11 & 27, and 50-237/78-32.

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'_4-~ ef -b r .ss'-- a ,fr bushines. Cath I l_i I s i- d i- - sf 2- Mn'-3:v as a re s.:lr ,f W A r i1 i'  ! bushin:s wr.= machined to achieve recuired clearance for orocer valve coeration.

i .- l studv to determine the acclicability of teflon as a bushing material has been initi- !

j i a l ated.

l 1 A I 80 7 8 9 F AC'LITY VETHCD OF DISCOS E RY CISCO'v ER Y OE 50RipT'ON STATVS  % POWER OTHER STATUS N/A l3lg Routine Surveillance l l5 y l 9l 0l 3 44 l

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NUVBE A lo 1010 l@l OESCP PTICN N/A 1647 125 i 80 7 9 9 tt  ?;

LOSS OF OR DAM ACE 70 ra0;Lif y ^

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DEVIATION REPORT DV R NO.

Commonwealth Ed,ison STA UNIT YEAR N O.

D- 12 ~ 2 79 102 CCCU RREO PART1 TITLE OF CEVIATION 11:15 11-24-79 Binding of Torus to Drvwell Vacuum Breaker 2-1601-32F CATE WE TE5ilNG PLANT CONClilCNS SYSTEM AFFECTED 1600 820 W LJgg Containment yog, Run p3,,,,,,,., 2490 , to,g gywg3 vgs CE5CLP!iCN CF EvtNT During surveillance DOS-1600-9, valve was found to be binding.

DESCRIP!iCN OF CALSE Unknown OTrER APPLfCAELE INFORMATION Valve was wired closed and work request submitted for repairs. Presently, this is the only inoperable vacuun breaker.

ECU;PVENT b YE5 CR NC. W R N C. ,

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FAILU RE O NO N/A D03:43 ' ^ ^ ?. 3Q s.3, . - g no s 2 .

PHT: I: E:;.- .3 E.G; NEE;5 C ..'E,75 Repairs will :e .ade durin wee < end cutare o f Dec 1, 1979. __

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TYPE : CE,iATiCN EVENT OF PCTENTIAL TECH 5:EC NCN :E::R*A:LE A'.',L e RE.1*EC REDC:TAELE CCCLF ENCE PUELIC INTE:EST VICLATt N CC L::ENCE RE:"T~'NG A: : 5 5'_ E:

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REFCATAE.E CCCL::ENCE ACTION ITEY NC. PRCYPT CN-S!TE NOTlFICATICN

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R. M. Ratan 11/26'70 3:a3

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'H79 064/03'J-0 N/A TITLE CATE TIME 21-HCLR NRC NOTIFICATION PROMPT OFF-SITE NOTIFICATICN TPH '; / s p, p31-er 11/ 2 ? o 11 'a RE3 C'. I!I CATE TIME ~;TLE CATE ~ YE N/A J. Gilliom 11/27/79 11:28 T ce.,

RE G : CT, Iii & CCL CATE TIME TITLE DATE TlVE RESPCNSi cLE CCYP ANY O F FI CER I NFOPVED O F 10 C F R 21 ccNei*icNs AND mEi o QEPOAT TO NGC b <Ti M e 0....t .,t

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T. L@ne For J .%'.l '[ui ciga 11/26/70 REVIEW AND COMPLETED OP E _w A .,

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ACCEPTANCE BY STATION REV: EA AS RE UiREC

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RESCLUT!CN APPROVEC AND / p /o2 C/ 7 AUTHCRIZEC FOR ClSTRIBUTICN STATION y ERINTENCENT 'CATE

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