ML19305B358

LER 80-006/03L-0:on 800215,during Local Leak Rate Test Performed on a Feedwater Inboard Check Valve 3-220-58A Measured Leakage Exceeded Tech Specs.Caused by Worn Seat/ Disc Assembly Pins

ML19305B358
Person / Time
Site:	Dresden
Issue date:	03/13/1980
From:	Ciesla T COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17192A580	List: ML17192A579 ML19305B358
References
LER-80-006-03L-02, LER-80-6-3L-2, NUDOCS 8003190576
Download: ML19305B358 (2)

Text

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-o 121 l During Unit 3 refueling outage, a LLRT was performed on "A" feedwater inboard check l c,3, l valve 3-220-58A. The measured leakage was 1,104.51 SCFH, which exceeded the limit l g,,,  ; for a single isolation valve (29.38 SCFH, Tech. Spec. 4.7.A). This was of mini =al l g,3, , safety significance since leakage measured through the outboard feedwater check valve l 016 l l Was belOV IGCh. Spec. limits and the feedwater line is Capable of being isolated by l o ,,; ; a motor operated valve upstream of the check valves. Similar event: 50-239/78-03.  ;

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36 37 40 41 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS s t o l l Excessive leakage through feedwater check valve 3-220-58A was dte to worn seat /dise I 1 1il l arsembly pins, which prevent proper alimment of the dise to the seat. The seat / disc I

,,2i l assembly was replaced and the valve retested. Leakage was reduced to 0.520 SCFH. I i ; 31 l well below Tech. Spec. limits. ' The replacement assembly pins and bushings are made l

,,,,l from a hardened alloy. No further corrective action deemed necessary. I g g 80

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D 3 9 PART1lTlTLE OF DEVIATION OCCU RRED

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l Fesd Water Check Valve Excessive Leakage 2/15 80 1p,1]

1 0 ;g SYSTEM AFFECTED PLANT CONDITIONS TESilNG 3200 g Feedwater- MODE Refuel ,,, , yw7 3 0 , te,o gywg3 0 YEs NC DESCRIPitON OF & VENT  ;

During LLRT of feedwater inboard check valve 220-58A , the measured leakage was 1,104.511 SCFH, exceading the Tech Spec. limit of 29.38 SCFH for a single penetration of isolation valve.

DESCRIPTION OF CAUSE Unkriown OTHER APPLICABLE INFCRMATION Leakage was stooped bv feedwater outboard ch'eck valve 220-62A.

EQUIPMENT C YE5 DR NO. 'WR NO.

J hn Dunbar 2/24/80 FAILURE I INO N/A 05027 DATE

1. ESP _ONSIBLE SUPERVISOR PART 2 l OPERATING ENGINEERS COMMENTS To*al l a n 'n c a *krouch the "A" feedwater did not exceed the limit for throuch leakace civen in 4.7.A.2.e. However,the limit for single valve leakage was exceeded.

SAFETY-TYPE OF CEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLI C INTEREST VI OL ATI ON OCCURRENCE REPGRTING WR ISSUED 14 DAY 10CFR21 YES YES L 30 DAY NOTI FI C ICN NO NO REPORTABLE CCCURRENCE ACTION ~ ITEM NO. PROMPT ON-SITE NOTIFICATION NUMBER R. M. Ragan 2/25/80 1400

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rdi- 80-6/03L-0 N/A TITLE DATE TIME 24-HOUR NRC NOTIFICATION PROMPT OFF-SITE NOTIFICATION TPH F. Palmer 2/26/80 8:45

_ REGION Iil DATE TIME TITLE DATE TIME

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TGM J. Gilliom 2/26/80 8:45 REGION iiI & COL CATE TIME TITLE DATE TIME RESPONSI BLE COMP ANY OFFI CER INFORMED OF 10 C F R 21 CON 0iT!ONs aNO TwEv o oEPORT TO NPC

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REVIEW AND COMPLETED /1 M. Wright 2/26/80

// OP E R AT I N G ENG (N Edn DATE CEP BY STATION REVIEW DATE .  !

RESOLUTION APPROVEC AND / / M 8 4 O AUTHORIZED FOR DISTRIBUTION ' STATION SCPERINTENDENT l

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