ML20205T589

Responds to IE Bulletin 86-001 Re Min Flow Logic Problems That Could Disable RHR Pumps.Review Supports GE Initial Conclusion That Problems Outlined in Bulletin Do Not Apply to Facility

ML20205T589
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	06/06/1986
From:	Berry K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
IEB-86-001, IEB-86-1, NUDOCS 8606160084
Download: ML20205T589 (3)

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DMD Consun1ers POVVer rowsums MENCGnW5 PROGRE55 oeneral off'ses: 1946 West Pernell Road, Jackson, MI 49201 + (517) 788-0550 June 6, 1986 i James G Keppler, Administrator Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PLANT -

RESPONSE TO IEB 86-01, MINIMUM FLOW LOGIC PROBLEMS THAT COULD DISABLE RHR PUMPS Nuclear Regulatory Commission letter dated May 23, 1986, transmitted IEB 86-01 which requires Consumers Power Company to promptly determine: 1) whether or not Big Rock Point has the described single failure vulnerability; 2) immedi-ately instruct all operating shifts of the problem and measures to recognize and mitigate the problem if it exists; 3) within seven days of receipt of the bulletin, provide a written report to the NRC which identifies whether or not the problem exists, and if the problem exists, identify short-term modifica-tions to plant operating procedures or hardware that have been or are being implemented to assure safe plant operations; and 4) if the problem exists, provide a written report within 30 days of receipt of the bulletin informing the NRC of the schedule for long-term resolution of problems identified as a result of the bulletin. Consumers Power Company's response is provided herein.

The bulletin describes a single failure in the minimum flow logic which could disable the Residual Heat Removal (RHR) Pumps at some GE boiling water reactor facilities. Rasiew of the bulletin against Big Rock Point design concludes that the concerns within are not applicable. This was also the case in our review of an ecrlier document, IE Information Notice 85-94, " Potential for Loss of Minimum Flow Paths Leading to ECCS Pucp Damage During a LOCA."

Big Rock Point does not utilize a Low Pressure Coolant Injection (LPCI)

System. Instead, a Core Spray System is used for post LOCA make-up and Reactor Building Spray. A Shutdown Cooling System is used for decay heat removal during shutdown conditions. None of the Fire Pumps (2), Core Spray Pumps (2), or Shutdown Cooling Pumps (2) have minimum flow recirculation lines, and thus do not use minimum flow valve bypasses as described in the bulletin.

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~ James G Keppler, Administrator, Region III 2 Big Rock Point Plant Response to IEB 86-01 June 6, 1986 Our review supports CEs initial conclusions that Big Rock Point is not affect-ed by the concern. No further actions are planned.

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Kenneth W Berry Director, Nuclear Licensing CC Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement NRC Resident Inspector - Big Rock Point l

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CONSUMERS POWER COMPANY Big Rock Point Plant Docket 50-155 License DPR-6 IE Bulletin 86-01 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 our response to IE Bulletin 86-01 dated May 23, 1986, entitled, Minimum Flow Logic Problems That Could Disable RHR Pumps. Consumers Power Company's response is dated June 6, 1986.

CONSUMERS POWER COMPANY By R B DeWitt, Vice President Energy Supply Services Sworn and subscribed to before me this 6th day of June, 1986.

Elaine E Buehrer, Notary Public '

Jackson County My commission expires October 31, 1989 OC0685-0099-NLO4