ML20202E332

Concurs W/Conclusion That 860101 Reactor Coolant Pump Shaft Failure Bounded by Locked Rotor Analysis.Util Safety Evaluation Re Operation W/Repaired Pumps Will Be Reviewed

ML20202E332
Person / Time
Site:	Crystal River
Issue date:	06/24/1986
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Wilgus W FLORIDA POWER CORP.
References
NUDOCS 8607140330
Download: ML20202E332 (3)

Text

I June 24,1986 Docket No. 50-302 Mr. Walter S. Wilgus Vice President, Nuclear Operations Florida Power Corporation ATTN: Manager, Nuclear Licensing

& Fuel Management P. O. Box 14042; M.A.C. H-3 St. Petersburg, Florida 33733

SUBJECT:

REACTOR COOLANT PUMP SHAFT FAILURE ANALYSES

Reference:

FPC letter, Widell to Stolz, same subject, dated 5/5/86 As ycu know, the Office of Nuclear Reactor Regulation (NRR) has kept abreast 1,1986 reactor coolant pump (RCP) shaft of events related to the January (CR-3). Contacts between our staffs, with NRC failure at Crystal River Unit 3 resident inspectors and personnel at Region II, with other companies involved with the shaft and other pump components and their examination, and your presentation to us on April 24, 1986, have helped our understanding of the event and of your position in this matter as sunnarized in the reference letter.

You state that RCP shaft failure is bounded by the locked rotor analysis, and have provided additional clarifying information to the NRC staff in recent telephone discussions to support this conclusion. We agree with your conclusion.

Since a definitive root cause of the shaft failure has not yet been established, we agree that continuation of your thorough review of all relevant data is appropriate and necessary. Please continue to keep us apprised of new information and conclusions in this area.

In addition to the infonnation presented at the April 24th meeting and in the referenced letter, discussions between our staffs have indicated that you have installed an improved vibration monitoring system, including new calibrated sensors and readout and alarm capability.

In addition, you will continue to investigate state-of-the-art systems in order to permit utilization of an optimum system to assure early identification of any pump shaft damage so that appropriate corrective action may be taken before possible gross failure.

Engineering and operations staff as appropriate will be trained in the current system and any future modifications.

hjjCM05030 860624 S

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Mr. W. S. Wilgus Crystal River Unit No. 3 Nuclear Florida Power Corporation Generating Plant cc:

Mr. R. W. Neiser State Planning and Development Senior Vice President Clearinghouse and General Counsel Office of Planning and Budget Florida Power Corporation Executive Office of the Governor P. O. Box 14042 The Capitol Building St. Petersburg, Florida 33733 Tallahassee, Florida 32301 Mr. P. McKee Mr. F. Alex Griffin, Chairman Nuclear Plant Manager Board of County Commissioners Florida Power Corporation Citrus County P. O. Box 219 110 North Apopka Avenue Crystal River, Florida 32629 Inverness, Florida 36250 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 220, 7910 Woodmont Avenue Bethesda, Maryland 20814 Resident Inspector U.S. Nuclear Regulatory Commission Route #3, Box 717 Crystal River, Florida 32629 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Mr. Allan Schubert, Manager Public Health Physicist Department of Health and Rehabilitative Services 1323 Winewood Blvd.

Tallahassee, Florida 32301 Administrator Department of Environmental Regulation Power Plant Siting Section State of Florida 2600 Blair Stone Road Tallahassee, Florida 32301 Attorney General Department of Legal Affairs The Capitol Tallahassee, Florida 32304

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DA6 - o / b Mr. Walter S. Wilgus 1 j

We plan to review your Safety Evaluation covering plant operation with the repaired RCPs in accordance with 10 CFR 50.59 Sincerely,

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