ML17252B173

LER 80-13/03L-0 for Dresden Unit 3 Regarding B Feedwater Outboard Check Valve 3-220-62B Leakage Exceeding Limit for a Single Isolation Valve

ML17252B173
Person / Time
Site:	Dresden
Issue date:	04/22/1980
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS Ltr. #80-336 LER 80-13/03L-0
Download: ML17252B173 (2)

Text

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Commonwela Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920

________________________________________________________ -Apr-i--1---2-2-,-1980---- ------- - --

BBS Ltr. 1180-336 James G. Keppler, Regional Di_rector Directorate of Regulatory Operations_ - Region III

u. S. Nudear Regulatory -Coil_im:Lss~{oii_

799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report #80-13/031-0, Docket #050-249, is being sub~itted to your office in accordance with Dresden Nuclear Power Station Technical Specification*6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting

.. condition for operation.c*or plant shutdown required by a limiting condition for operation.

.,,.Qi,M..p <i-o..

B. B. ~~son Station Superintendent Dresden Nuclear Power Station BBS:nh Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC 0

• .* ., r ~~ LICENSEE EVENT REPORT.

• .* .~i C_9J:l(f,OL: BLOCK:! 1...*-.l.-~l_!L-*-L-'-*........ G) . IP LEASE PRINT OR TYPE'A.QUIOEOJNfORMATIONJ

EJ B.* 9 .

jr.11}*0~. IR l~'l3*l@Jo fo,l~:lo'lofo-lo+o]-lo*lo~l@l41"r 1 1rh*lrl01 I* L©

. LlCENSEE*cooe. . 14* 15. . LICENSE NUMBER . . 25 °26* LICENSE. TYPE*. JO .. 57 CAT 5B. .

E. B .

~~~~~ LI©r 60

• 61*

01 5 I 0 ,. O* I 0 I 21 4 DOCKET NUMBER I 9 Gr 0 1. 3 i 2 I 8 I 8 1*0 I© I o: I 4 I 2 I 2 I 8 I0 68 69

• EVENT DATE 74 .75

• REPORT DATE BO*

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EVENT DESCRIPTION AND PROBA__~~~_(?_NS_~q~!=llJC.E_?'@_:_ _ ~- . _. _____ ------------- ------.- *--:- . .-. - . - ~ . - - - - - - - - - -

rrrf"-0\.irin-g Unft:-~rr*efueiing outage,. a: LLRT *was perforned on. "B ... fe~dwater outboard check

• I.

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LI ..?..';_96:..:..7.:.*8:..6:..**--=.S.:::  :!..l.*_.::."w.:.:h;i:.::c..:.:h:.:. *.:::.e::.:x:.::c:.::'e:.::e:.:d:.:e:.:d=--:t:.:h.:.:e:..*..;:l::..:im=i::.:*t::.-;,.** - - - J C!..FH.

m. !' for a ' . .

sing).e isolation valve (29 .38' SCFH, Tech .. s*pec-.. 4 .7 .A).

This was* of minimal J:

lIJ safety significance since leakage measured through* the inboard feedwat.er check valve I*

l§J was. below* Tech. Spec~ limits* and* the feedwater line is' capable of being* isolated by lz:J I a motor operated valve* upstream of the *check valves. Similar event:* 50-:-239/78-03, &

m 8 9, 50",.-249 /80-06 *.

• SYSTEM CAUSE.. CAUSE COMP. "'v'ALVE ao.

CODE.

• CODE.*. SUBCODE* COMPONENT CODE *. SUBCODE .. SUBCODE .

EI B ..

Is 9

IA 10 1.8 L.:_J@

11 *

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12 . 13 Vj-.Aj LI, VI El Xj@ -~ l~J@

18. 19 20 .

SEQUENTIAL OCCURRENCE. REPORT REVISION,

,<::;\ LER/RO. c-VENT YEAR REPORT NO. . CODE TYPE NO:

-~ iEPO~T UMBc:R I 8. *.10 I Io 11 I 3 I I /j* I o I 3 I* L1J l=J.

• LQ_J 21 22

• 23~ 24 26 27

• 2B* 29: JO. 31* 32 ACTION FUTUF!E C:Fi=ECT SHUTDOWN* * (.:;::;\ ATTACHMENT . NPAD-4* PRIME COM!'. COMPONENT ,**

• TAKEN ACTION* ON PLANT . METHOD . , . HOURS *: SUBMITTED FOAM SUB.* SUPPLl!:F!. MANUFACTURER

• ~@La@*.LEJ@* LU ro1010,*101 L!iJ@ w.*L!.J@): I c 1.6 I 6~* 1s *l@

33 . 34 ' 35 36 37 40* .. 41. *. ' 42 '. 43, . . 47 .. ;

CAUSE DESCAIPTION*AND CORAECi:LV.E ACTIONS. .

J]J I Excessive leakage through feedwater check valve 3-220-62B was due: to*worn seat/disc

m 1* assembly pins; which prevent proper aligm'nent of the disc t 0' the : seat . The seat/djsc I.

m assembly was.replact;!d and the*val:ve retested: Leakage was reduced* to 0 .513 SCFH 1 l lIJ I well below: Tech. Sp.ec. limits. The new replacement assembly pins and bushings are l~::r .I made. from* a. hardened* alloy. No further corrective* action. deemed necessary.* I.

B 9 BO FACILITY METHOD OF A m LID@>"

a STATUS 9.

ACTIVITY 1o 10

• CONTENT

% POWER.

, a 1 o12'L...' 11 OTHER-STATUS.

~N/~A-*---.....J

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44 DISCOVERY L..BJ<2.'V~l_L_o_c_a_l_L_e_a_k_R_a_t_e_*_T_e_s_t_ _.;._.,.._---...----'

45 46 DISCOVERY DESCRIPTION*.~

BO RELEASED OF RELEASE *AMOUNT OF ACTIVITY E

LOCATION OF RELEASE.@

~ @, t~J L...I___N_/A_.-------J N/A B 9 10 11 ' 44 45 30 PERSONNEL EXPOSURES r:;;:;..

NUMBER *_TYPE* DESCRIPTION**

I!J*a J 9

• Oj 01 Ol@t_:_j@L--*_N_IA_

11 . I 2 - . 1J . .

.. _*- - - - - - - - - ' - ' - " - - - - - - - - - - - - - - - - - 80 PERSONNEL INJUAI ES.

• f,;;\

NUMBER CESCAIPTION~

EJa I oI o I o1rl@L___li,j~--------------------------:-:'

9 12 ao LOSS OF OR OAMAGE TO FACILITY f43\

TY?E. DESCRIPTION '.:::::J DJ LIJ@

il 9 10 N

PUBLICITY (;;\

. NRG USE ONLY ISS:.JEDQ DESCRIPTION \3;. *0 DJa

• LJ!Jei 9 10

• N/A

• 68 69 I I I I I I I I II I I I

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BO*;

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