05000237/LER-1979-064-03, /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

/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: 05000237/LER-1979-064-03, /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
References
LER-79-064-03L, LER-79-64-3L, NUDOCS 7912270265
Download: ML19256G026 (2)

LER-1979-064, /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

Event date:
Report date:
2371979064R03 - NRC Website

text

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

\\,

CONTROL BLOCK:

l l

l l

I lh (PLL

,L PRINT OR TYPE ALL REQUIRED INFORMATION) t 6

i!lI IL ID lR lS l2 l@l 0 ] O l -l 0 l 0 l 0 l 0 l 0 ] - l 0 l 0 l@l 4 l l l 1 l 11 1l@l l

l@

o 7

8 9 LICENSEE CCOE 14 16 LICENSE NI veer 2S 26 LICENSE TYPE 40

$1 CAT W CCN'T s[S"y lL l@l 01 S l 0 ] 0 ] 0 l 2 l 3 l 7 @l l l 11 2 l 4 l 7 l 9 @l 1 l 2 l 2 l 11 7 l 9 l@

ol1 7

8 60 61 DOCKET NUVSER 68 69 EVENT O ATE 74 7S RE*CRT DATE i!O 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

closed position and normal operation continued since 11 (9 required) vacuum breakers l 3 i.;

3 5i l were operable. As a result, this event has minimal safety significance.

Similar l

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

o e ] events:

I a l'1 I I

i.I2' 3:

7 9 9 Sv; E" OA.SE CAL!E 0; /2

. A c. E 000E CC;E 366 ;E C C'/ * : t :'-T 00E

_.:::05 3.32:;5 I:19 IS l A l @ l E l@ l B j (E) lVlAILIVlElX19 l C)@ l CI (%@

v v

v 7

a 9

0 l'

1:

aE ro-

=E.-~

sE:.:

2

F _ :s

- E u

=E-:=-

s:

E g

_E2 O Q,'g*,'

7l9I l!

O oIa l/

0l3 l l Ll l-l l0 l

.s a

v A:m:N r.;Tu a E Ec:E:-

s-c cc.

2-c n-v = :.4

= =, E :: n C: ce:

=t-

- ' E; F O A.i u Lop; E =

vas.racTu=Eo T a( E '. ACTION O N a L A.-

VET-::

- Ouas smE i

l31@lFl@

l 21@

l~ @

010l010l Sl($

lYl@

l '. l@

lA 51515 (E

.2

.o 4:

o 4:

42 u

4-cAusE CEs;RiPTiON Ar.c ::=oEcrWE AcricNs @

a,fr bushines.

Cath I

l_i I s i-d i- - sf 2-Mn'-3:v as a re s.:lr

,f W

'_4-~

ef

- b r.ss'--

! bushin:s wr.= machined to achieve recuired clearance for orocer valve coeration.

A r

i1 i' l studv to determine the acclicability of teflon as a bushing material has been initi- !

i.-

j i

a l ated.

l 1

A I

80 7

8 9 VETHCD OF F AC'LITY STATVS

% POWER OTHER STATUS DISCOS E RY CISCO'v ER Y OE 50RipT'ON Routine Surveillance l

l5 y

l 9l 0l 3 N/A l

l3lg SJ 7

6 3 17 44 45 46 AOTl/iTV CO*. T E NT

1. ELEASEC C5 RE.E ACE AVOLNT OF ACTIV'Tv LCC AT'ON 08 AE LE ASE Iz I @ l l@l N/A l

N/A l

i c

7 8 9 10 tt 44 4S SJ PER$CNNEL E XPC3bAES NUMBER TvPE MSCRIPTICN 39

}

l0 0l0l@lZl@i NA 1

7 60 7

8 9 11 1;

13 PER$CNNE L iNjypIE S 1647 125 i

NUVBE A OESCP PTICN lo 1010 l@l N/A i

80 7

9 9 tt

?;

^

LOSS OF OR DAM ACE 70 ra0;Lif y h TvoE DESCRioT'ON lZl@l N/A

_ y []

l 1

3 yi-sa 7

. 9 iO PLe t:CiTv NRC L6E CNLY issut OESCRiPricN o INI i

N/A l

IfItilliIIIlli 68 69 83 1 7

8 9 to h M ar XA21 S

Nave OF Pospanga PsONE-

DEVIATION REPORT DV R NO.

Commonwealth Ed,ison STA UNIT YEAR N O.

D-12 ~ 2 79 102 CCCU RREO PART1 TITLE OF CEVIATION 11-24-79 11:15 Binding of Torus to Drvwell Vacuum Breaker 2-1601-32F CATE WE TE5ilNG PLANT CONClilCNS SYSTEM AFFECTED 1600 W LJ Run 2490 820 Containment

yog, p3,,,,,,,.,

, to,g gywg3 vgs gg 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.

O NO N/A D03:43

' ^ ^ ?. 3Q s.3,. - g no s

~~ ^

,9 FAILU RE 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.

5::E ~.

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:

lg

-- T Y. :.T:

Yt: Qi

.r.--,,.

is rs-1._

]

. ]

NC

'0

' C[ ((N 2C CA*

REFCATAE.E CCCL::ENCE ACTION ITEY NC.

PRCYPT CN-S!TE NOTlFICATICN

....=e"-

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

'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 R E 3 C'.

I!I CATE TIME

~;TLE CATE

~ YE T ce.,

N/A J. Gilliom 11/27/79 11:28 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 b <Ti M e 0....t

.,t

' o$

ccNei*icNs AND mEi o QEPOAT TO NGC T. L@ne For J.%'.l '[ui ciga 11/26/70 REVIEW AND COMPLETED 4

OP E _w A., 'n t%iattN vait jor

~ '

ACCEPTANCE BY STATION REV: EA

/

I AS RE UiREC J* ]' 'M"

/ D ~ 2-/~ 7 9,.,

/

c4Tg RESCLUT!CN APPROVEC AND

/

p

/o2 C/

7 AUTHCRIZEC FOR ClSTRIBUTICN STATION y ERINTENCENT

'CATE 1647 126

..:,,1.

go..,,....,