ML20147H656

Describes Lube Oil Sys & Proposed Mod to Reduce Potential Lube Oil Leakage from Reactor Coolant Pump.Lube Oil Sys Oversized Drawing Encl

ML20147H656
Person / Time
Site:	Maine Yankee
Issue date:	10/23/1978
From:	Moody D Maine Yankee
To:	Reid R Office of Nuclear Reactor Regulation
References
WMY-78-99, NUDOCS 7810270077
Download: ML20147H656 (3)

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• c:rzzz%$O B.S.3.2 WMY 78-99 Octobe r 23, 1978 United States Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Of fice of Nuclear Reactor Regulation Robe rt W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors Ref e rences : a) License No. DPR-36 (Docket No. 50.-309) b) USNRC letter to R.H. Groce f rom R.W. Reid dated April 24, 1978,

Subject:

Amendment No. 37 to Facility Operating License

Subject:

Fire Protection System Modifications - Reactor Coolant Pump Lube 011 Collection Table 3.2 of the Saf ety Evaluation Report attached as part of Ref erence (b) above, required us to submit information on our proposed modifications to the Reactor Coolant Pump. The requirement is as follows:

3.2.7 Reactor Coolant Pump Lube Oil The licensee will evaluate the potential for lube oil leakage f rom the reactor coolant pump lube oil system to determine the modifications necessary to ef fectively collect and contain lube oil leakage from all mechanical connections. The necessary modifications will be proposed and design details and criteria will be submitted f or NRC staf f review (5.15).

Maine Yankee has evaluated the potential for lube oil leakage from the reactor coolant pump lube oil sys tem. The following inf ormation contains j a brief description of the oil system and a proposed modification to l

ef fectively collect and contain lebe oil leakage from mechanical connections.

The reactor coolant pump motor has 3 bearings; a lower journal bearing, en upper journal bearing and a thrust bearing. The lower journal bearing is enclosed in the motor housing and is lubricated by an enclosed 1

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4 U. S. Nuclear Regulatory Commission October 23, 1978 Att: Of fice of Nuclear Reactor Regulation Page 2 res e rvoir. The potential for oil loss in this bearing is extremely remote and no modification to this area will be considered.

The upper journal bearing and thrust bearing are located in a " top hat" section on the top of the motor (see attached drawing). The bearings and oil reservoir are enclosed in a steel cylinder and are not subject to oil loss. The oil lif t and backstop pumps, coolers, and associated piping are located external to and around the cylinder.

There is some probability that cil leakage will occur at one or more of the mechanical connections of the oil system causing an oil loss.

Maine Yankee proposes to collect the oil by welding a 2 inch steel curb around the base of the R.C.P. motor top hat area, thus preventing any oil leakage from running down the side of the motor and eventually coming in contact with hot R.C. system piping. The steel curb will be drilled to provide a flow path and a gravity flow piping system will be installed to conduct the oil f rom the " top hat" area to a 55 gallon drum located on the 2' elevation of the containment. The barrel will be covered and a vent will be provided. Each R.C.P. vill be provided with an oil collection system.

We trust that the above modification answers the NRC concerns with this area. If further information is desired, please contact us.

Yours ve ry truly, Maine Yankee Atomic Power Company f b& fd ]E44

. E. Moody V

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