05000281/LER-1981-043-03, /03L-0:on 810617,in Preparation for Flushing of Sensitized Pipe,Valve 2-SI-73 Was Discovered Open.Cause Unknown.Valve Closed & Locked

/03L-0:on 810617,in Preparation for Flushing of Sensitized Pipe,Valve 2-SI-73 Was Discovered Open.Cause Unknown.Valve Closed & Locked

ML20009E825
Person / Time
Site:	Surry
Issue date:	07/17/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009E816	List: 05000281/LER-1981-037-03, /03L-0:on 810608,NaOH Concentration of Cat Exceeded Tech Spec Limits.Cause Not Stated.Concentration Diluted & Personnel Will Be Reinstructed 05000281/LER-1981-043-03, /03L-0:on 810617,in Preparation for Flushing of Sensitized Pipe,Valve 2-SI-73 Was Discovered Open.Cause Unknown.Valve Closed & Locked ML20009E814
References
LER-81-043-03L-02, LER-81-43-3L-2, NUDOCS 8107280470
Download: ML20009E825 (2)

LER-1981-043, /03L-0:on 810617,in Preparation for Flushing of Sensitized Pipe,Valve 2-SI-73 Was Discovered Open.Cause Unknown.Valve Closed & Locked

Event date:
Report date:
2811981043R03 - NRC Website

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The reason for 2-SI-73 being in tne open position is unknown. Opening of 2-SI-73 was;

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EVENT DATE:

06-17-81 TITLE OF EVENT:

2-SI-73 FOUND OPEN 1.

EVENT DESCRIPTION

With the Unit at 100% power, valve 2-SI-73 (a containment isolation valve) was found in the open position while preparing for PT-18.1 (flushing of sensitized stainless steel piping). This is contrary to T.S.-3.8.2.A.1 and is reportable per T.S-6.6.2.b(2).

E 2.

PROBABLE CONSEQUENCES:

Valve 2-51-73 is a containment isolation valve in the accumulator drain header. Although this valve was open, the two valves downstream of 2-SI-73 (2-SI-223 and 2-SI-184) were verified as being closed; therefore the health and safety of the public were not affected.

3.

CAUSE

The cause of the valve having been lef t in the open position is unknown.

It was clcsed and verified closed after performing PT-18.1 dated 5-16-81.

On 6-14-81, 2-SI-73 was opened to perform OP-7.1 (recirculation of the accumulators with the EWST). The valve was again closed and verified as such on 6-14-81.

4.

IEEDIATE CORRECTIVE ACITON:

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The i=cediate corrective action was to close the valve once PT-18.1 was

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completed.

I 5.

SUBSEQUENT CORRECTIVE ACTION:

The subsequent corrective action was to verify that the valve was closed and chain locked in that position.

6.

ACTION TO PREVENT RECURRENCE:

The present program for valve position v..rification requires that

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two individuals verify the correct position " the valve following completion of testing. It is believed that this p ogram continues to be ef fective, and should preclude events of this type.

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GE'ERIC IMPLICATIONS:

None.