ML19269E314

LER 79-019/03L-0 on 790524:vacuum Breaker 1-1601-32D Failed to Give Closed Indication.Caused by Binding on Valve Stem Not Allowing Disk to Shut.Defective Bushing & End Packing on Valve Stem Replaced

ML19269E314
Person / Time
Site:	Quad Cities
Issue date:	06/15/1979
From:	Leech K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19269E312	List: ML19269E311 ML19269E314
References
LER-79-019-03L-01, LER-79-19-3L-1, NUDOCS 7906270205
Download: ML19269E314 (3)

Text

NRC FORM 366 U.S. NUCLEAR RECULATORY COMMISSION wm -

• LICENSEE EVENT REPCRT COi1 TROL BLOCA. '

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7 8 60 6: Gd 14 75 EVENT DESCRIPTION ANO PROBA8LE CONSEQUENCES h O 2 l While conducting the suppression chancer to drywell vacuum breaker monthly exercise l g ,

(QOS 1600-1), vacuum breaker 1-1601-32D failed to give a closed indication. Subsequently, g ; Technical Specification 3.7.A.4.b could not be met. The unit was in the process of g gg being shut down for a scheduled maintenance outage at the time. All other vacuum breakegs O 6 l Operated properly. g I OTTI I I O a i j 7 8 s 80 E ODE SUSC E COMPONENT CODE SLB DE SU E

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44 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h i o l An inspection of the valve indicated that the valve stem was bindina. thus not allowino l ITTT 1 I the disk to fully shut. A defecrive bushing was replaced as well as the end Oackina f

, 7 g on the valve stem. The vacuum breaker was satisfactorily tested. l mi I 1 4 l l 7 8 9 80 STA  % POWER CTNER STATUS IS O RY DISCOVERY DESCRIPTION i s l Dl@ [0 l2 l6 l@l NA l B j@l Routine Test l A IVITY CO TENT AMOUNT OF ACTivtTY LOCATION OF RELEASE 1 6lRELEASE @D OF RELEASE NA lZlgl l l NA l 7 8 9 10 t1 44 45 60 PERSONNEL EXPOSURES NUMBER TYPE D ESCRIPTION NA iTTil I ol 010 '@l Z l@l l

• ERSONNEL INJURIES NuMeER OESCnlPTION i a 101Ol01@l NA qg7A p%

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10 K.. Leech - - - - - - -

-- 309-654-2241 ext . 176  ?

NAurnfPAFPAAFA PHONE: -

l. LER NUMBER: LER/R0 79-19/03L-0

11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit One IV. DOCKET NUMBER: 050-254 V. EVENT DESCRIPTIO!i: .

On May 24, 1979, while conduc- 1g the suppression chamber to drywell vacuum breaker monthly exercise (Q0S 1600-1), vacuum breaker 1-1601-320 failed to give a closed indication. It coulc not be determined if the valve actually failed to close or if it just was a limit switch problem, because of the inaccessibility of the vacuum breakers. Subsequently, Technical Specification 3.7. A.4.b could not be met. The Unit was in the process of being shut down for a scheduled maintenance outage. Work request 2868-79 was written to investigate the problem. An event of a similar nature was reported in RO 77-49/03L.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The suppression chamber to drywell vacuum breakers on Unit One had'all been successfully operated previously on April 26, 1979 During the exercise test performed on May 24, all other vacuum breakers operated properly; thus, the safety implications of this occurrence were minimal.

Vll. CAUSE:

An inspeccion of the v&lve indicated that the stem was binding, thereby not allowing the disk to fully shut. During disassembly, a rough spot was found on the bushing at one end of the valve stem.

Vill. CORRECTIVE ACTION:

The defective bushing was replaced as well as the packing on that end of the valve stem. The vacuum breaker was then tested satisfectorily.

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