ML20084L933
| ML20084L933 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 05/07/1984 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20084L936 | List: |
| References | |
| 29789, NUDOCS 8405150131 | |
| Download: ML20084L933 (3) | |
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Vice PresiJcnt - Projects, Engineering and Construction oeneral offices: 1945 West ParnaH Road. Jackson. MI 49201 * (517) 78& O453 May 7, 1984 Mr Harold R Denton, Director Office of Nuclear Reactor Regulation Division of Licensing US Nuclear Regulatory Commission Washington, DC 20555 MIDLAND ENERGY CENTER MIDLAND DOCKET NOS 50-329, 50-330 FIRE PROTECTION ANALYSIS AND EVALUATION OF MAIN CONTROL ROOM C31 CONTROL PANELS FILE 0485.1, B9.5.1 SERIAL 29789 REFERENCES (1) NRC 10/26/83 MEUTING
SUMMARY
DATED 11/9/83 (2) NRC 1/26/84 MEETING
SUMMARY
DATED 3/27/84 ENCLOSURE MAIN CONTROL ROOM ANALYSIS AND EVALUATION FOR C31 CONTROL PANELS DATED 4/19/84 In recent fire protection meetings with the NRC Staff, References 1 and 2, Consumers Power Company presented its analysis of the effects of main control room fires. During these meetings, we described our position on the protection of redundant safe shutdown systems from fire induced electrical circuit faults. As a result of these discussions, the Staff requested that a more detailed evaluation of the " Safety Parameter Display Panels," (IC31 and 2C31), be provided for review. The enclosed report, " Main Control Room Fire Analysis and Evaluation for C31 Control Panel," docr.nents the results of this analysis.
The computer analysis perforn.ed considered, among other things, the existing C31 panel design, possible designs modifications and the use of operator actions. The proposed design modifications include the installation of radiant heat shield insulation within cabinets, the use of fire dampers for cabinet ventilation vents and the use of isolation switches and/or electrical interlocks for mitigating hot shorts which may have a safety significance.
Operator actions considered include use of alternate control points and electrically isolating control circuits at motor control centers. This analysis demonstrates that with the proposed combination of design modifications and operator actions there is no credible main control room fire which can preclude our ability to safely shutdown the plant.
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We are forwarding this enclosed report to the Staff for their evaluation in preparation for future meetings with the NRC.
In the interim, we would be pleased to discuss any aspect of the enclosed evaluation with the Staff.
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JWC/MFC/bjw CC RJCook, Midland Resident Inspe tor JGKeppler, Administrator, NRC egion III DSHood, Licensing Branch #4 oc0484-0841a100
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CONSUMERS POWER COMPANY Midland Units 1 and 2 Docket No 50-329, 50-330 Letter Serial 29789 Dated May 7, 1984 At the request of the Commission and pursuant to the Atomic Energy Act of 1954, and the Energy Reorganization Act of 1974, as amended and the Commission's Rules and Regulations thereunder, Consumers Power Company submits its fire protection evaluation and position on the protection of safe shutdown circuitry in the C31 control room panels.
CONSUMERS POWER COMPANY By
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ames W Cook, Vice President Pr cts, Engineering and Construction Sworn and subscribed before me this 9 day of 7/yjff Nf9
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