ML20086C607

Interim Deficiency Rept Re Vibration Problems of Reactor Coolant Pumps 11,12,13 & 14.Initially Reported 730413. Impeller & Coupling Taper Rates Matched to Shaft Taper & Coupling Installed True to Ctr

ML20086C607
Person / Time
Site:	Salem
Issue date:	05/09/1973
From:	Betz J Public Service Enterprise Group
To:	Kruesi F US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086C587	List: ML20086C598 ML20086C607 ML20086C619 ML20086C625
References
NUDOCS 8311290027
Download: ML20086C607 (2)

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John F. Betz Public Service Electric and Gas Company 80 Park Place Newark.N J. 07101 201/622-7000 '

Vice Prosident in Charge of Electnc operation May 9, 1973 U. S. Atomic Energy Commission Director of Regulatory Operations -

7920 Norfolk Avenue Bethesda, Maryland 20014 Attention of Mr. Frank E. Kruesi Gentlemen:

REACTOR COOLANT PUMP INTERNALS NO. 1 UNIT SALEM NUCLEAR GENERATING STATION i

! On April 13, 1973 during an AEC inspection.of the

} Salem Nuclear Gene rating Station site , it came-to our attention l through your inspector that Westinghouse. Electric Corporation-l had requested the return of No. .ll, 12,-13 and 14 Reactor j Coolant Pump Internals for corrective action. This was j verbally reported to the Director.of Regulatory Operations,

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Region 1 on April 13, 1973 We stinghouse was immediately

requested to furnish an explanation- and -analysis of the; intended corrective actice. 'The following is quoted from' l Westinghoust Electric Corporation letter dated April 19,,1973:

"In late 1971, Westinghouse became-aware i that.a icv. pumps in service exhibited j . appreciably higher' vibration ~ amplitudes than the*/ did when they were' checked.out. -

during manufactureHat Cheswick,.even though these higher vibration amplitudes were .

withinJthe~ limits-of the pump: specification

. 'and the problem wasLonly associatedEwithia cmall. number of/pamps. EWestinghouse felt:

1 that it was in the be't s laterestsfoff;ourselves.

and our customers'to determine its.cause'and:

take the necessary-corrective action to insure long' bearing and pump seal life . .The i

preventive' corrective actionito>be performed:

, at Cheswick upon return.of-the.four: Unit 1. *

-pumps'is as follows:

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8311290027 730612 r .

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U.S. Atomic Ene rgy 5-9-73 Commission

1. Impeller and coupling taper rates will be matched to shaft taper.

2. Coupling will be installed on shaft and face machined true to center line of shaft.

3 The entire rotating assembly (coupling, chaft and impeller) will be balanced as a complete unit.

4. Replace present coupling to motor bolts with a match weighted set.

"In addition to the above, the seal housing flange will be machined to accept an 0-Ring seal rather than the current gasket seal. This will update the pump to a later revision and insure a better seal between the seal housing and the main flange.

"The pump internals for Unit 2 had the rework incorporated prior to their ship-ments to the Salem Site. Therefore, these need not be returned to Cheswick."

To date, Westinghouse has done this identical rework for four other utilities and, in their opinion, this is an upgrading and does not constitute a deficiency that could adversely affect safety. The return of this equipment to Salem is expected to be completed by August 1, 1973 If you have any further questions. on this subject, please feel free to contact us.

Very truly yours, I

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