05000265/LER-1980-022-03, /03L-0:on 801005,isolation Valves AO-2-203-1C & QO-2-203-1D Had Closure Times of Less than 3 Seconds.Caused by Speed Control Being Out of Adjustment.Valves Retimed

/03L-0:on 801005,isolation Valves AO-2-203-1C & QO-2-203-1D Had Closure Times of Less than 3 Seconds.Caused by Speed Control Being Out of Adjustment.Valves Retimed

ML19336A672
Person / Time
Site:	Quad Cities
Issue date:	10/15/1980
From:	Kehret D COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19336A670	List: 05000265/LER-1980-022, Forwards LER 80-022/03L-0 05000265/LER-1980-022-03, /03L-0:on 801005,isolation Valves AO-2-203-1C & QO-2-203-1D Had Closure Times of Less than 3 Seconds.Caused by Speed Control Being Out of Adjustment.Valves Retimed
References
LER-80-022-03L-03, LER-80-22-3L-3, NUDOCS 8010300444
Download: ML19336A672 (2)

LER-1980-022, /03L-0:on 801005,isolation Valves AO-2-203-1C & QO-2-203-1D Had Closure Times of Less than 3 Seconds.Caused by Speed Control Being Out of Adjustment.Valves Retimed

Event date:
Report date:
2651980022R03 - NRC Website

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LICENSEE EVENT REPORT n

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EVENT CESCRIPTION AND PROB A8LE CONSECVENCES h lol2l l While performing Main Steam Line isolation Valve Closure time testing, 0.05 250-4,

,o ;3 ; ; valves A0-2-203-lC and QO-2-203-10 had closure times of less than 3 seconds. Also, l

p ; full closed indication was not received from valve A0-2-203-2B.

The probable con-l

o,,j ; sequences were minimal since any abnormal pressure transients received from an auto-l i n g, ; ; matic closure of the main steam isolation valves would have been distributed across j

4n the other two main steam lines. Valve A0-2-203-28 was visually timed at 3.7 seconds l

l O 1,1 I which is within the limits prescribed in Technical Specification Table 3.7.1.

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.i 31 40 43 42 43 44 37 OAusE DESCRIPTION AND CORRECTIVE ACTIONS h I ; I a ; '@ cause of valves A0-2-203-lC and A0-2-203-lO was the sDeed control beino out of

!,Iijl adjustment. The drywell was deinerted and the valves were adlusted and retimed to

,,,.;lwithin the prescribed limits. The cause of valve A0-2-203-2B not having full closed l

lij: l l indication was a faulty 1imit switch. The 1imit switch wiil be repaired or replaced j

i i[4 ; i during the next Unit 2 Outage.

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LE9 '! UMBER: 80-22/03L-0 11.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station 111.

FACILITY NAME: Unit Two IV.

DOCKET NUMBER: 050-265 V.

EVENT DESCRIPTION

During Main Steam Line Isolation Valve closure time testing, QOS 250-4, valves A0-2-203-lC and A0-2-203-lD had closure times of less than three seconds. Table 3.7.1 of the Technical Specifications require a closing time of three to five seconds. Also during the test, valve A0-2-203-2B did not get a full closed indication. A visual timing of A0-2-203-2B was performed. A0-2-203-28 timed closed in 3 7 seconds.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The effect on the safety of the reactor was minimal. The requirement for the valves to close in greater than three seconds is to prevent an abnormal transient in the main steam lines.

In the event of valves A0-2-203-lC and A0-2-203-10 closing too quickly, the transient would be distributed across the two other main steam lines. The faulty light indication for A0-2-203-28 presented no adverse safety concern, since the valve was visually timed closed at 3 7 seconds.

Vll.

CAUSE

The cause of the malfunction was due to equipment failure. For valves A0-2-203-lC and A0-2-203-ID the speed control on the isolation valve was out of adjustment.

For valve A0-2-203-2B the limit swi tch was faulty.

Vill.

CORRECTIVE ACTION

After the initial timing of valves A0-2-203-lc and A0-2-203-lD, the NRC resident inspector and NRC Bethesda office were notified. The drywell was deinerted and the closing times were re-tested to within the limits after the speed control valves were readjusted. Valve A0-2-203-2B was visually timed in the MSIV room.

Its limit switch will be repaired or replaced during the next Unit 2 outage.