ML19318B661

LER 80-010/03L-0:on 800517,while Performing Quartlerly MSIV Closure Timing Surveillance Procedure Qos 250-4,MSIV AO 2-203-1C Closed in 2.5-s & MSIV AO 2-203-2D Closed in 9.1-s. Caused by Equipment Failure.Speed Control Valves Adjusted

ML19318B661
Person / Time
Site:	Quad Cities
Issue date:	06/10/1980
From:	Steffes C COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19318B656	List: ML19318B655 ML19318B661
References
LER-80-010-03L-04, LER-80-10-3L-4, NUDOCS 8006270272
Download: ML19318B661 (2)

Text

m NRC FORM 366 U. S. NUCLE AR REcuLATORY COMMisslON

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OArE EVENT DESC6tPTION AND PROBA8LE CONSEQUENCES h I- :l l While performing the quarterly MSlV closure timing surveillance, procedure QOS- l g: ,; ; 250-4, MSIV A0 2-203-lC closed in 2.5 seconds and MSIV A0 2-203-2D closed in 9 1  ;

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seconds. These times exceed the Technical Specification Table 3 7-1 limits of g g, three seconds minimum and 5 seconds maximum closing times. The other 6 MSivs were 3l l

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, ,  ;; tested three times with a IC valve closure time of 3.4 seconds and a 2D valve l

, _jl closure time of 3.6 seconds. l

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1. LER NUMBER: LER/R0 80-10/03L-0

11. LICENSEE NAME: Commone- lth Edison Company Quad-Cities Nuclear Powr* Station Ill. FACILITY NAME: Unit Two IV. DOCKET NUMBER: 050-265 V. EVENT DESCRIPTION:

On May 17,1980, during a Unit Two condenser maintenance outage, the quarterly MSIV closure timing surveillance procedure 40S 250-4, was pe rfo rmed. While performing this test, MSlV A0 2-203-1C closed in 2.5 seconds, and MSIV A0 2-203-2D closed in 9.1 seconds. These times ex-ceed the limit of 3 seconds minimum and 5 seconds maximum closing time for any MSIV as stated in Technical Specification Table 3.7-l. The other 6 MSIVs were within the Technical Specification limits.

VI. PROBABLE CONSEQUENCES:

The main steam isolation valves are required to close in less than five seconds to prevent fuel rod rupture, and greater than three seconds to prevent abnormal transient in the event of a steam line break outside the containment. The 2D valve is the outboard primary containment isolation valve in the D steamline. The ID inboard valve closed in less than five seconds to isolate the D steam line. The IC inboard primary isolation valve closed in 2 5 seconds which would have caused a slight transient. This transient would be distributed across the other three main steam lines, subsequently safe reactor operation was not affected as a result of this occurrence.

Vll. CAUSE:

The cause of this occurrence is designated as equipment failure. The speed control valve adjustment on the hydraulic control cylinder had varied, thus affecting the valve travel time. The control valve is a needle valve that regulates the speed of the hydraulic oil flowing from the bottom to the top of the piston. The piston is attached to the stem of the MSIV to regulate the travel speed of the valve.

The speed control unit is manufactured by FIIck-Reedy Corp. , Drawing No.

File 4536.

Vlli. CORRECTIVE ACTION:

The speed control valves were adjusted, and the valves were tested three times with a 2D valve closure time of 3.6 seconds and the IC valve closure time of 3.4 seconds.

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