ML19270F675

LER 79-006/03L-0 on 790125:during Primary Containment Isolation Valve Closure Timing,Valve AO 1-1601-21 Failed to Close in 10 Seconds.Caused by Improper Adjustment of Valve Speed Control from Operational Wear.Control Was Readjusted

ML19270F675
Person / Time
Site:	Quad Cities
Issue date:	02/21/1979
From:	Swales J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19270F672	List: ML19270F671 ML19270F675
References
LER-79-006-03L, LER-79-6-3L, NUDOCS 7903070357
Download: ML19270F675 (2)

Text

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REPORT DAT E 80

/ 8 60 61 DOCKET NUYBE R 68 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o l 2 l l While performing Primary Containment Isolation (PCI) Valve Closure Timing, procedure l lo l3 l l QOS 1600-14, valve A0 1-1601-21 failed to close in the required time of less than o 4 l or equal to 10 seconds (T.S. Table 3.7-1). The valve actually closed in 12 seconds. l o 5 l The consequences of this occurrence were minimal because valve A0 1-1601-21 is a l o e l normally closed valve and because all PCI valves downstream of A0 1-1601-21 (A0 1-1601-l lgg,y ; 22, A0 1-1601-55, and A0 1-1601-56) had acceptable valve closure times.  ;

O H 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPON ENT CODE SUBCODE SUBCODE l0l9]8 l5 D @ g@ l BlQ l Vl Al Ll V l 0 l P l@ 18 19 DlQ lZ lQ 20 7 9 to 11 12 13 SE QUE NTI AL OCCURRENCE REPORT REVISION LE R EVENT YE AR REPORT NO. CODE TYPE NO.

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]g 41 42 Yjg ltijg 43 lVl0l9l5lg 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l o l l The speed control on the valve was found to be out of adj ustment. The apparent cause l

, , l of the misadjustment was due to normal operational wear. The valve speed control was l readj us ted. The valve was retimed and had a closure time of 7 seconds. l i 3 l 1 4 l l

80 7 8 9 ST^ S OTHER STATUS ISC V RY DISCOVERY DESCR'PTION Rout,ine Test i 3 Hg l 0%Pd'E"0lg l flA l gl ACTIVITY CONTENT RE L E ASE D OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE tlA 7

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l. LER NUMBER: LER/R0 79-06/03L-0

11. LICENSEE NAME: Commonwealth Edison Company Quad-Ci ties Nuclear Power Station Ill. FACILITY NAME: Unit One IV. DOCKET NUMBER: 050-254 V. EVENT DESCRIPTION:

On January 25, 1979, while performing Primary Containment Isolation (PCI) Valve Closure Timing, procedure QOS 1600 -14, the A0 1-1601-21 valve failed to close in the required length of time. Technical Specification Table 3.7-1 requires this valve to close in less than or equal to 10 seconds. The valve actually closed in 12 seconds. Unit One was shutdown for refueling at the time of this occurrence. The last time this valve failed the closure timing test was May 14, 1974 and was reported in incident number 1-4-1-74-18.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The A0 1-1601-21 valve is a Drywell Purge Valve which is normally closed when the unit is operating. In addition all PCI valves downstream of A0 1-1601-21 (A0 1-1601-22, A0 1-1601-55, A0 1-1601-56) had acceptable valve closure times.

Valve A0 1-1601-21 had been functionally tested for isolation capability using procedure QOS 1600-12. Safe reactor operation was not affected by this occurrence.

Vll. CAUSE:

The cause of this occurrence is component failure. Upon investigation, it was found that the speed control on the valve operator was out of adjustment. The apparent cause of the misadjustment is normal operational wear. The speed control is part of a solenoid-operated 4-way Versa valve model VGS-4422-U.

Vlli. CORRECTIVE ACTION:

Corrective action taken was to readjust the 4-way solenoid valve speed control. Valve 1-1601-21 was then retimed on February 6, 1979 and had a closure time of 7 seconds.