ML19347A521
| ML19347A521 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 04/25/1979 |
| From: | Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-03-06, TASK-3-6, TASK-RR NUDOCS 7905040099 | |
| Download: ML19347A521 (3) | |
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.. s....on, u...... moi. 4,.. co...in...o.o April 25, 1979 Director, Huclear Reactor Regulation Att Mr Dennis L Ziemann, Chief Operating Reactors Branch No 2 US Uuelear Regulatory Commission
'4ashington, DC 20555 DOCKET 50-155 - LICEUSE DPR BIG ROCK POINT PLANT - SYSTDIATIC EVALUATION PROGRKi SEISMIC REVIE'd HEC letter dated January 15, 1979 requested Consumers Power Company to provide information concerning our efforts relating to review of Big Rock Point's capability to withstand seismic events. Specifically, Consumers Power Company was requested to outline our program for dccumenting a seismic design basis and provide a schedule for this effort. This letter provides the required response.
Cons a - ~ m company intends to utilice the services of a consultant to develop a seis=1c
/ sign basis for Big Rock Point. Several potential con-sultants have been contacted with respect to performing this voik. The work scope described in these contacts includes:
1.
Previding dynamic models of structures listed in the attachment to this letter.
The models vill be required to be of a scoping nature containing only sufficient detail to enable a reasonable assignment of loads to important structural elements. The models vill be exercised using an appropriate example earthquake design response spectrum to be specified later by Consumers Power Company. The models will be required to be sufficiently general to accommodate a reasonable range of seismic design spectra ao that the design spectrum finally chosen can be incorporated at a later date; 2.
Providing response spectra at locations of rajor mechanical and electrical equipment; 3
Providing results of dyna =ic seissie analysis in a form suitable for incorporation into a structural analysis; k
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Providing a structural analysis sufficient to determine whether the structures can withstand the postulated earthquake. The definitions of " withstand" and "the postulated earthquake" vill be developed through parallel SEP efforts involving interaction with the NRC staff and vill be provided to the consultant by Consu=ers Power Company; 5
Developing methods of evaluating the s'upports of plant mechanical and electrical equip =ent utilizing results of analyses in 1, 2 and h above; and 6.
Developing a =ethod for seis=ically qualifying the existing buried fire /ECCS header, buried fuel tanks, lake bed buried cooling vater intake piping and buried electrical conduit.
Consu=ers Power Co=pany expects to have secured the services of a consultant within approximately 30 days. The program described above is expected to be completed in early 1980.
The January 15, 1979 NRC letter suggested that detailed working =eetings between Consu=ers Power Co=pany and the NRC staff to discuss both program scope and schedule would be beneficial. Consu=ers Power Co=pany agrees that such a meeting is desirable. We vill propose a preliminary date for such a
=eeting as soon as possible after obtaining a consultant.
s
David A Bixel Nuclear Licensing Administrator CC: JGKeppler, USNRC
a.
l ATTACB EIT TO CONSUMERS POWER COMPANY LETTER DATED APRIL 25, 1979 Structure Reason for Including in Seiscie Design Review Contain=ent and internal Safety-related/contains safety-related structure.
equipment.
Turbine building (including Contains safety-related equipment.
pipe tunnel and electrical penetration area).
Service building and office Demonstrate it would not collapse and/or addition.
damage the turbine building or equipment in the turbine building.
Sphere ventilating room.
Contains safety-related equipment (vent valves).
Stack.
Demonstrate it would not collapse and damage containment.
Fuel cask loading dock / core Base =ent contains safety-related equipment.
spray equipment room.
Screenhouse/ diesel generator Path to ultimate heat sink /contains safety-room / discharge structure.
related equipment.
Intake structure and lake bed Ultimate heat sink water source.
pipe.
Buried fire main piping.
Supplies ECCS piping.
Underground electrical cable.
Supplies emergency diesel generator power to plant; supplies power to core spray room.
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