ML19319B359

Final Deficiency Rept Re Hpis Pump,High Bearing Temp. Pump Thrust Bearing Temp Exceeded 170 F max.Closed-loop, Water Cooled Sys Designed & Installed.Preoperational Testing Performed on Forced Lubrication Oil Sys

ML19319B359
Person / Time
Site:	Davis Besse
Issue date:	01/20/1977
From:	Roe L TOLEDO EDISON CO.
To:
References
188, NUDOCS 8001150944
Download: ML19319B359 (3)

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A m ~ 4 TOLECO D l355bbb LOWEu. E. RCE Serial No.188 v.c. pr.. .,

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Do*cket No. 50-346 mei rsisa4 January 20, 1977 Mr. James G. Keppler Regional Director Region III

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Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Read Glen Ellyn, Illinois 60137

Dear Mr. Kcppler:

l This letter is submitted in accordance with 10 CTR50.55(e) as a final report regarding the Davis-Besse Nuclear Power Station Unit I high pressure injection pump, high bearing temperature deficiency which was discussed between our Mr. J. D. Lenardson and your Mr. C. Williams during a site visit on 12/15/76.

Description of the Deficiency During the run-in of the high pressure injection (HPI) pumps, the metal temperature of the pump thrust bearings exceeded the maximum allcwable temperature of 170 F. ,

Corrective Action Taken The pumps were supplied to Toledo Edison by Babcock & Wilcox. Our investigations with the vendor led to the conclusion that a forced lubrication oil system would be required for the HPI pump bearing housing.

A closed-loop, water-cooled system consisting of a reservoir, two pumps, (one AC and one DC), heat exchanger, filter, valves, tubing, temperature and pressure indicators and controls has been designbd and installed on each HPI pump. Normal operation utilizes the AC oil pump and motor.

The forced lubrication oil system is presently undergoing chechout and pre-operational testing. Preliminary operation of the pumps with the redesigned lubrication oil system has indicated the corrective action to be effective. Satisfactory completion of the above mentioned pre-operational testing will result in final acceptance of the design.

THE TOLECO ECISCN COMPANY EDISCN PLA A 300 MADISCN AVENUE TCtECO. CH:0 40652 JAN 2 G 1977

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Safety Implications The correction of the deficiency as described above prior to the opera-tion of the facility assures that the. health and safety of the public are not jeopardized.

Yours very truly, .

Mclf W aj c/2 cc:

Dr. Ernst Volgenau w

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