ML20084E777

Ro:On 700130,motor Operated Svc Water Valves 4013,4300 & 4028 on Emergency Suction Line to Auxiliary Feedwater Pumps Reported to Operate Improperly.Caused by Operating Personnel Misunderstanding

ML20084E777
Person / Time
Site:	Ginna
Issue date:	02/27/1970
From:	Nelson E ROCHESTER GAS & ELECTRIC CORP.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8304150346
Download: ML20084E777 (2)

Text

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\.~ /N O O-G l ROCII: ESTER Gon .', W L. C T NaC CCH1'o : , nGil ~ :) L .s i .h. u.R Wit WEl!, ll.Y !*M u a, 8 gi February 27, 1970 .x xp./ w4 t~u! +

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Subject:

Accarent failure of the motor operated service water-

. . .w valves (4013, 4300, and 4028) on the emergency suction lines to the auxiliary feedwater pumps to operate properly Ginna Staticn Unit I?o.1 Docket Ho. 50 244

Dear Dr. Morris:

Cn Friday, January 30,1970, at 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />, the motor operated service water ralves (4023, 4300, and 4028) on the emergency suction lines to the auxiliary feedwater pumps were reported to the A.E.C. Divicions of Cc:npliance and Licensing as being inoperable. Immediate investigation proved that thece "1lves were operable and that the problem was due to the misunderstanding by the operator and by the engineer observing the operation of the valves as to just hca there valves had to be operated by the switches en the control board.

Each of the three auxiliary feedwater pumps has a four inch,126 psi ,,

service water connection to the suction piping of the pumps. The normal source of water to the auxiliary feedwater pumpo is from the condensate stcrage tanks. If we should use all of the water in the condensate storage tanks, the pumps would then have to be supplied with water from the service water system. (Tech. Spec. 3. 4.1-C. ) Each of the service water lines has a manual coerated valve (4093, 4345, and 4344) and a motor operated valve (4013, 4300, and 4028) on the suction piping to the pumps. Cn the control board there are three, two position (open-close) switches with green (closed)

] gj and (open) indicating lights.

gg 'n Friday, January 30,1970 an engineer was checking the operation of these motor operated valves (4013, 4300, and 4028). All three manual valves and the three motor operated valves on the service water lines were closed and the engineer told the operator to open one of the motor operated valves while he observed its proper o 2 ration. The operator turned the .

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ROCitESTCH G AS AND CLEC4.

SHECT HO. l o^rr February 37, 1970 2 l "Dr. Peter A. Morris mvitch to the open position and then released the switch. The green pocition indicating light was on and the red position indicating light came on. The entjineer observed that the valve only moved a short distance and then utopped. The engineer again requested the operator to open the valve.

Again the operator turned the avitch to the open position and then released the critch. The engineer again observed that the valve only moved a chort distance and then atopped. The engineer then requested the operator to try '

the other two motor operated valves and he observed the same thing happen.

An electrici'm wac called and he observed the came operation of the valveu au the operator sp3 rated the avitch at the control board. It was decided to open and cloce the motor operated valves manually and then have the electrician jumpar the s"1+ches ao that the valves would go through their full travel. Thi:. 7:aa done and while the valves were opened and closed the chafts and gear traina were lubricated.

By thic time the electrician had studied his electrical schematics and (#

found that these motor coerated valves were throttling type valves, and as such the avitchea on the ecntrol board had to be held in the open position to operate the valve to its ndl open position. All three valves were then operated proparl:. by the operator in the control room. The system was returned to normal operaticn at 1745, January 30, 1970.

All motor operated valves in the plant were checked and four were found to be thrcttling typ3 valves. These four valves have been properly luentified en the ecntrol board and all operators and engineera have been instructed as to the propar way to remotely operate this type of valve n'om th 3 centrol board.

Very truly youra, yjVL , G Ew;ard J. Nel)( son i

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