L-75-180, Telephone Conversation Furnishing Information Concerning the Safety Injection System

Telephone Conversation Furnishing Information Concerning the Safety Injection System

ML18227B983
Person / Time
Site:	Turkey Point
Issue date:	04/10/1975
From:	Robert E. Uhrig Florida Power & Light Co
To:	Elliott D Office of Nuclear Reactor Regulation
References
L-75-180
Download: ML18227B983 (6)

Text

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l ~p FLORIDA POWER 8L UGHT COMPANY Aprx,l 10, 1975 L-75-180 P ~<~qy 40 o~

Mr. Donald,, Elliott Division of Reactor Licensing Operating Reactors Branch of Nuclear Reactor Regulation,

'ffice U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. Elliott:

Re: Turkey'oint Units 3 6c 4 Safety Injection System Do'cke't'os. '50-250 '6'50-'251 This letter is submitted to xeply to questions asked in your telepho'ne conversation of April 1, 1975, with G. E. Liebler.

1. Valves 3-862A and B,, 3-864A and B, 3-865A, B and C, 4-862A and B, 4-864A and B, and 4-865A, B and C, are "locked" in the open position by having thei'r circuit breakers locked open at the Motor Control Centers.

2. Only one RWST is required to satisfy the core cooling req'uirements during a loss of coolant accident. The RWST water is not required for a normal shutdown of the plant. The RWST can be utilized as an emergency makeup supply to the primary system via the'VCS charging pumps in the event of a loss of the normal supply. However, such'akeup would involve "only a fraction of the tank contents and would be considex'ably less than the amount required to satisfy the core cooling requirements. '.

As mentioned in item no. 1 above,'he accumulatory isolation valves'865A, B and C) are open and have their circuit breakers locked open at the motor, contxol centexs. These valves are not provided with 'a pressure interlock that will automatically open them when pressure in the 'RCS is increased above a certain value. Control of these valves to ensure that they are in the proper position with the circuit breakers locked open is accomplished administratively by'pecific instructions in the plant operating procedures.

HELPING BUILD FLORIDA

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April 10, 1975

4. Valve HCV-758 in the Residual Heat Removal System normally functions to control the flow of reactor coolant through the Residual Heat Removal Heat exchangers during a normal plant cooldown and thus control the rate of cooldown of the Reactor Coolant System. When the system is functioning as.'the low head Safety Injection System valve HCV-758 is required to be in the position corresponding to its fixed limit of travel in the open direction. In this position valve HCV-758 will pass the required flow during the injection phase "of a loss of coolant accident and will also ensure that adequate "flow is provided during post accident recirculation without exceeding the allowable Net Positive Suction Head for the RHR pumps while pumping an assumed saturated fluid from the containment sump.

Valve HCV-758 receives a signal to "fully open" upon initiation of the Safety Injection signal. Valve HCV-758 will also go to this "fully open" position in the event of a failure of the air supply or a failure of the power supply to thesolenoid. During normal operation, the air supply to the 'yalve is shut off, causing the valve 'to assume the proper posi'tion for its Safety Injection System function.

Ver'y truly yours, pA 8~~

Robert E. Uhrig Vice 'Pres'ident REU:HNP:nch cc: Hr..Jack R. Newman

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