05000281/LER-1978-035-03, /03L-0:on 781007,during Cold Shutdown,Valve Pit Flooded While Draining Circulating Water Box D.Caused by Damage of Valve from Flooding

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/03L-0:on 781007,during Cold Shutdown,Valve Pit Flooded While Draining Circulating Water Box D.Caused by Damage of Valve from Flooding
ML18113A595
Person / Time
Site: Surry 
Issue date: 10/31/1978
From: Raucom T
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18113A593 List:
References
LER-78-035-03L, LER-78-35-3L, NUDOCS 7811060217
Download: ML18113A595 (2)
v • d • e


LER-1978-035, /03L-0:on 781007,during Cold Shutdown,Valve Pit Flooded While Draining Circulating Water Box D.Caused by Damage of Valve from Flooding
Event date:
Report date:
2811978035R03 - NRC Website
v • d • e

text

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT e CONTROL BLOCK:!

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I With the u..'1.it at cold shutdown, motoY operated valve NOV-SW-202B was found to be

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!The motor *:':'e:-=.'.::2::,~c.:, da;naged by flooding of the valve pit by water pumped from

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Surry Power-Station, Unit 2 Docket No: 50-281 Report No: 78-035/0JL-0 Event Date: 10-7-78 Failed Motor Operator on Service Water Valve

1. Description of Event

During a cold shutdown period, the valve pit, containing HOV-SW-202B, was flooded while draining the circulating water box D.

The valve operator was 3~~rted by the flooding and the valve became inoperable in its automatic_-

i:!Ode.

The valve is required to shut automatically on "LOCA-plus-blackout"

£or c~rculating ~a~er conservation.

="e £ail::=-~ 2= the automatic function of the valve because of damage to the ~-:-'-=~,,~or :::o~""~ ----.~stitutes a condition that is reportable in accordance

,.;it::.

-=-.-;-,,,,...e_-::-, :':::-:::<:::..::::_cation 6.6.2.b.(2).

2.

Proo2-.=_2 -:::o:-.:s2::e:.:,==:c::S and Status of Redundant Systems:

-:::::,::':! -,--=2.,-=: ::C!DV-3W-202B incorporates an auto-close function as a means of conse=-:-'~g c::..::-=-~a=i__~g water during LOCA-plus-blackout ~onditions.

The valve was --....: ____ ::::e =2.uure was discovered and remained shut until the operator was -.-"'-:;--- -:-=-,-.

-:::.2 health and safety of the public were not affected.
3.

Cause

--"' s 2-.-e::1:::: occurred because a drain line _could not accept the volume of water-::~~ i:ron condenser 2-CN-SC-lB (D-Waterbox) to station drain to facili=.s_te 2 -,.::-;ntenance operatio_n.

The water filled the valve pit, containing the 1*1017-s:;-2023, thereby shorting out the motor.

4.

Immediace Cor=ective Action:

The valve pit was pumped out, and the motor tested for grounds caused by the water.

5.

Subsequent Corrective Action:

The motor was replaced and the valve was made operable in all respects.

6.

Actions Taken to Prevent Recurrence:

Personnel are instructed to control the pump discharge so as not to endanger adjacent equipment.

7.

Generic Implications:

None, the failure occurred due to water penetration of the electrical components.

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