ML20116D124

Supplemental Part 21 Rept Re Byron Jackson River Water Pump Couplings.Initially Reported on 921101.Caused by Lack of Matl Toughness.Replacement Couplings Were Screened to Insure Adequate Toughness & Purchase Spec Amended

ML20116D124
Person / Time
Site:	Beaver Valley
Issue date:	10/29/1992
From:	Noonan T DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-92 ND3MNO:3366, NUDOCS 9211050198
Download: ML20116D124 (4)

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[ ND3MNO:3366 Ileaver Valley l'ower Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 10 CFit 21; Ilyron Jackson itiver Water Pump Couplings S14ThuntaLhifuniht11uti United States Nuclear Regulatory Commis!. ion Document Control Desk Washington, DC 20555 Attn: Director, Ofnee of Nuclear Reactor Regulations

[7 dentlemen:

Duquesne Light Company hereby submits supplemental information relative to the Beaver Valley Power Station pump couplings supplied by llyron Jackson.

Should you have any further questions regarding this matter, we will be pleased '

to discuss them with you.

Very truly yours, t

T. P. N(onan General Manager Nuclear Operations JJM/sl Attachment 050003 p/f 9221030190 922029 ilj_

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L October 29,1992 ND3MNO:3366 Page 2 Attachment 1 llVPS UNIT 2 - 10 CFil Part 21 Ilyron Jackson Illver Water Pump Couplings fiuppktiltitiit! Informadm1

! Duquesne Light Company initiahy submitted a 10 CFR 21 Report on November

• 1,1991 regarding the Beaver Valley Power Station (ilVPS) Unit I river water pump coupling failure. The pumps were supplied by 11WIP,13yron Jackson Pump Division.

A folinw up report was submitted on July 7,1992, which concluded the results of the matenni analysis. The cause of the failure was the lack of material foughness.

. Operating conditions combined with low toughness may have hastened the initial failure, but the analysis confirmed the cause to be material related.

During maintenance and overhaul of. the lleaver valley Power Station Unit 2 Service Water Pump 2SWS*P21 A, two coupling sleeves were found to contain longitud;nal cracks at corners of the key way slots. These couplings, both produced l from material heat #72337, were sent to lxhigh University Energy Research Center to confirm the material chemistry, m:chanical properties, and the failure mechanism. A third coupling, which was also produced from heat #72337, was found cracked on the Service Water Pump 2SWS*P21C and was also sent to Ixhigh for analysis.

The analysis cencluded the cause of falh.re of the couplings on the Unit 2

• Service Water Pumps was identical to that for the Unit 1 River Water Pump Couplings, even though the design is a keyed coupling rather than threaded as in Unit 1.

Replacement couplings were screened to insure adequate toughness and t1 purchase specification was amended to include impact requirements on the coupling m erial.

q Since the vendor's material requirements do not state a minimum toughness level, the potential exists for similar coupling failures on like equipment at other facilities.

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October 29,1992.

ND3h1NO:3366 Page 3 ,

q cc: . Mr. T. T. h1artin, Regional Administrator

United States Nuclear Regulatory Cornmission Region 1 475 Allendale Road

=

King of Prussia, PA 19406 o

Mr. A. DeAgazio, DVPS Licensing Psoject Manager

[" ~ United States nuclear Regulatory Commission Washington, DC 20555 Larry Rossbach, Nuclear Regulatory Commhslon, IIVPS Senior Resident inspector -

J. A. lloltz, Chlo Edison -

76 S. Main Street Akron,01144308 -

Larry Beck

Centerior Energy -

6200 Oak Tree Blvd.

Independence, Oil 44101-4661

- INPO Records Center -

Suite 1500

,, 1100 Circle 75 Parkway Atlanta,'GA 30339 f' G. E. Mt.dle, "i

Factory Mutual Engineering 680 Anderson Drive #DLD10 Pittsburgh, PA 15220-2773-

. Mr. Richard Jana'tl -

Department'of Environmental Resources 4 P.O. Box 2063 it; '

~16th Floor, Fulton Dullding a '

Harrisburg, PA 17120 '

Director, Safety Evaluation & Centrol -

. Virginia Electric & Power Co.

P.O. Box 26666 One James River Plaza

Richmond..VA 23261 K.N L

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October 29 -1992  !

ND3MNO:3366-Page 4 I

. W.11artley  !

Virginia Power Company  ;

$000 Domlnlon Divd.

25W Glenn Allen, VA 23060 J. M. Riddle '

llalliburton NUS F9ster Plaza 7 '

661 Anderson Drive Pittsburgh, PA 15220 1

Bill Wegner, Consultant 23 Woodlawn Terrace.

Fredricksburg, VA 22404

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