ML20052B502
| ML20052B502 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 04/27/1982 |
| From: | Beckham J GEORGIA POWER CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.B.1, TASK-TM TAC-42155, TAC-42156, NUDOCS 8205030072 | |
| Download: ML20052B502 (2) | |
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GeorgiaPower April 27, 1982 J T. Deckham. Jr.
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'W EDWIN I. HATCH NUCLEAR PLANT UNITS 1, 2 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION, REACTOR COOLANT SYSIEM VENTS NUREG-0737 ITEM II.B.1 Gentlemen:
Georgia Power Company submits the following information in response to your request for information dated February 26, 1982.
The Plant Hatch architect-engineer has identified the systems required for core cooling, and has reviewed the piping configuration of those systems to determine if accumulation of nonconciensible gas would cause the loss of system function.
In addition to the reactor coolant system, systems which may be required to maintain adequate core cooling are High Pressure Coolant Injection (HPCI), and Residual Heat Removal (RHR) which includes Low Pressure Coolant Injection (LPCI) and Core Spray.
The piping configuration of the HPCI, LPCI and Core Spray systems was reviewed to assure that there is no credible possibility of loss of system function from gas accumulation at high points.
Positive pressure is maintained on the HPCI system by the water in the condensate storage tank, or by water in the suppression pool, depending on system alignment. Suction piping on the LPCI and Core Spray system is at positive pressue due to water level in the suppression pool.
Once the piping is filled and vented following any maintenance or operation which requires it to be drained, there is no credible mechanism by which noncondensible gas can enter the suction piping and collect at high points.
Discharge piping of these systems was not reviewed because the HPCI system is below the level of the condensate storage tank which maintains it under positive pressure; LPCI and Core Spray discharge piping is maintained under positive pressure by jockey pumps.
Small amounts of gas present will be flushed through system piping into the reactor vessel when the system is started and will collect at the top of the vessel. If needed, a plant operator can remotely open a safety / relief valve and vent the gas to the suppression chamber.
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Page Two We' conclude that additional venting capability is not required to assure continued safe operation at Plant Hatch.
' Existing venting capability satisfies - the requirements of NUREG-0737, Item II.B.l.
Please contact this office. if you have any questions or comments.
I Yours very truly, O
h J. T. Beckham, Jr.
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