ML20043A609

Part 21 Rept Re Defective Axial Cracks in Pump Shaft in Region Immediately Above Impeller & in Reactor Recirculation Pumps.Probably Caused by Crack Growth as Thermal Fatigue. Technical Advisory Bulletin Will Be Sent to Each Util

ML20043A609
Person / Time
Site:	Monticello, Nine Mile Point, Brunswick, River Bend, Clinton, LaSalle
Issue date:	04/27/1990
From:	Thomas W SULZER BINGHAM PUMPS, INC.
To:	NRC
References
REF-PT21-90 NUDOCS 9005220307
Download: ML20043A609 (2)

Text

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QSULZER BINEHAM: .196

, 2800 N W. Front Ave

• PO Box 10247

• Portland. Oregon 97210 USA . (503) 226-5200

• FAX (503)226-5286

• ITT 4742014

[ 3 i p r G

. t April 27,'1990 i

U.--S. Nuclear. Regulatory Committee ,

Vendor. Program Branch

Washington, D.'.C. 20555

Dear Sir or Madam:

Per the requirements of :10CFR Part 21, Sulzer Bingham pumps Inc. (formerly Bingham-Willamette Co.) advises of a defect ,

condition on a basic component supplied to Commonwealth Edison LaSalle Units 1 and 2.

1 -The condition was first observed on the Reactor Recirculation  :

L pumps ini Unit 1A upon- a - maintenance disassembly during ,'

February:of 1987. The defects observed were axial cracks in the~ pump = shaft in the region immediately above_ the impeller.

Subsequent _ disassembly of the remaining- three (3) Reactor *

,. Recirculation pumps revealed similar conditions. The defects +

L .did not constitute a shaft failure.

Metallurgical evaluation indicated the most common cause of g ' crack growth as. thermal fatigue. At present the root cause of the thermal cycles which appear to be ' producing the cracking is not known.

The 'following list . represents the locations of reactor recirculation pumps supplied with this material.

LaSalle Units.1 and 2 Monticello Nine Mile Point 2 Brunswick 1 and 2 Hanford Unit 2 Clinton Riverbend m

9003220307 900427

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SULZER BINGHAM '

N-'- U. S. Nuclear' Regulatory Committee Page 2' 7

Simultaneously. Sulzer Bingham Pumps Inc. will advise the nuclear facilities via our " Technical Advisory Bulletin" 82-9004-001 of this potential condition..

Each plant'.shall.be asked to correspond' directly -with Sulzer Bingham Pumps.Inc., Mr. . Stan Pace - Product Manager - Power Generation, .to evaluate and reach a determination as to further action.

- Regards, SULZER BINGHAM PUMPS f

Wayne D. Thomac

_m ,

Manager Corporate Quality CC: B. Ayres U. Bo11eter T. Morton P. McCullough G. Halas S. Pace G. Parks Joe Wood NRC File WDT:kp