ML19332A345
| ML19332A345 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 08/26/1980 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-80-18, NUDOCS 8009110557 | |
| Download: ML19332A345 (2) | |
Text
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WISCONSIN Sectric rowca coursur 231 W. MICHIGAN, P.O. BOX 2046, MILWAUKEE, WI 53201 August ?p, 1980 Mr. J. G. Keppler, Regional Director Office of Inspection and Enforcement, Region III U. S. NUCLEAR REGULATORY COMMISSION 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
DOCKET NOS. 50-266 AND 50-301 RESPONSE TO IE BULLETIN 80-18 POINT BEACH NUCLEAR PLANT UNITS 1 AND 2 IE Bulletin 80-18 discussed a potential concern affecting plants which use their centrifugal charging pumps as safety injection pumps.
The concern is that the pumps, in the event of a failure of the pressurizer power operated relief valves, could be damaged due to lack of minimum flow before safety injection termination criteria are met following a secondary system high energy line break.
The Point Beach Nuclear Plant, Units 1 and 2, have reciprocating charging pumps and separate centrifugal safety injection pumps with a shut-off head of approximately 1500 psig.
The safety injection system has minimum flow recirculation lines which provide minimum cooling flow for the pumps when operating at shut-off head.
The minimum flow recirculation line remains open as long as water is being pumped from the refueling water storage tank (RWST) into the primary system.
The minimum flow recirculation line automatically closes when water is recirculated from the containment sump back to the primary system.
For secondary breaks and for small break loss-of-coolant accidents where the pressure could be above the pump shut-off head, the amount of water injected from the RWST is quite small and the minimum flow recirculation line will remain open during operation of the high head safety injection Since Point Beach Nuclear Plant was not listed as an affected pumps.
plant and the minimum flow bypass line remains open for all conditions prior to satisfying SI termination criteria, no calculations are needed to verify the availability of minimum cooling flow to the centrifugal safety injection pumps. W#
.8 0 0 g 110 55 7
Mr. J.
G. Keppler August 26, 1980 Since this bulletin and safety concern are not directly applicable to the design at Point Beach, the review and preparation of reports required by this bulletin required only about one man-day.
No corrective actions are necessary.
iPlease contact us if you require any further informaeton.
Very truly yours, l./ c'v, /
C. W.
F y,,
irector Nuclear Power Department Copies to NRC Resident Inspector Point Beach Nuclear Plant Director, Division of Reactor Operation NRC Office of Inspection and Enforcement Washington, D. C.
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