ML20079L803

Part 21 Rept Re 910620 Failure of Coupling in River Water Pump 1A Supplied by Byron Jackson.Caused by Mechanical Failure of Shaft Coupling.Metallurgical Analysis of Suspect Coupling Will Be Performed & Couplings Replaced

ML20079L803
Person / Time
Site:	Beaver Valley
Issue date:	11/01/1991
From:	Noonan T DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
References
REF-PT21-91 ND3MNL:3206, NUDOCS 9111070118
Download: ML20079L803 (6)

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.,m.y. ,o u n ,n a llovember 1, 1991 11D'3M110 : 3 2 06 Beaver Valley Power Station, Uni t 110, 1 Docket 11o. 50-334, License 110. DPR-66 19_Cf.lL21L.EY12!1_dAChfLQD_RiY.GI_.li.01er Pump _ CQMplingn United States 11uclear Rngulatory Commission Document Control Dosh Washington, DC 20555 Attn: Director, Of fico of 11uclear Reactor Regulations Geritlenon:

Duquesnc Light Company horchy submits the attached report in accordance with the recuirements of 10 CFR Part 21. This issue involves the Beavor Val'loy Power Station Unit i riser water pump couplings supplied by Byron Jackson.

Should you have any further questions regarding this matter, -

L we will be pleased to discuss them with you.

Very truly yours,

/0. b.lwcv < u' /cu T. P. 11oonan General Manager

!!uclear Operations JJM/sl Attacnment

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November 1, 1991

. ND3MNO:3206 P3ge two cci Mr. T. T. Martin, Regional Administrator United States Nuclear Regulatory commission Region 1 l 475 Allendale Road King of Prussia, PA 19406 C. A. Rotock, Ohio Edison 76 S. Main Street Akron, OH 44300 Mr. A. DeAgazio, BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, DC 20555 J. Deall, Nuc lear Regulatory Commission, '

DVPS Senior Resident Inspector Larry Beck -

Centerior Energy 6200 Oak ~ Tree Blvd. '

Independence, Ohio 44101-4661 INPO-Records Center ,

Suite 1500 1100 Circle 75 Parkway Atlanta, GA 30339 l G._E. Muckle, Factory Mutual Engineering 680 Anderson Drive #DLD10 Pittsburgh, PA-15220-2773 Mr. Richard Janati Departmant of Environmental Resources P. 0. Box 2063 e 16th Floor, Fulton Building Harrisburg, PA 17120 Director,-Safety Evaluation & Control ,

Virginia Electric & Power Co.

P.O. Dox 26666-One-James River Plaza Richmond,. VA 23261 W. Hartley Virginia Power Company 5000 Dominion Blvd.

13W Glenn Allen, VA-23060 ',

-J. M. Riddle

.NUS Operating Service' Corporation Park West II Cliff Mine Road

-Pittsburgh,.PA 15275

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- November 1, 1992 1

!{D3MNO: 320 G Pago throo i Bill bugner, Consultant  ;

23 Woodlawn Terrace Fredricksburg, VA 22404 I I l

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Attachment 1

, . Page 1  !

10 CFR Part 21 1 l}VPS UniL1 - Byron Jackagn Rivet _, linter Pumn _Cmaplinga 1

I (1) 11ame and Address of Individual Making flotification:

T. P.14oonan, General Manager, lluclear Oper'Ations Duquesne Light company Beaver Valley Power Station P. O. Box 4 Shippingport, PA 15077

) (ii) Basic Component Affected:

l River water pump couplings for Model #28 KXil,

' J one-stage vertical circulator pump 1

(iii) Firms Supplying Components: j Supplier: BWIP International, Inc.

Byron Jackson Pump Division p.O. Box 2017 Terminal Annex _,

Los Angeles, California 90051 (213) 587 6173 ,

1 Fabricator: Unknown (iv) 11ature of Defect:

During a startup of the 1A. River Water Pump (WR-P-1A) -

on June 20, 1991, the pump failed. An investigation of the failure was initiated and revealed a mechanical failure of the shaft coupling. A root-cause analysis was initiated to determine the failure mode.

Independent laboratory testing results received from l Lehigh U.tiversity on September 25, 1991, attributed the coupling failure from the 1A pump to-embrittlement of the 410 S.S. material due to improper tempering temperatures and the potential presence __ of tramp elements. Impact tests on the failed coupling showed-  ;

an energy absorption of six foot-pounds-in a 7MM X 10MM charpy V-notch sample at room temperature.- This was ,

the lowest value exhibited by - the four couplings from-the suspect heat and of_the three heats of couplings tested.

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Attachment 1

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A review of pump oporating and test records showed that vibration levols were trending upwards prior to the fa13ure. This may be indicativo of a condition which led to the coupling failuro. (floto: Unit i Technical ,

Specificatjons require only two of the Terco river  ;

water pumps to be oporeblo. ) Vondor analysib indicated a worn bearing and/or pump shaf t misalignment led to a condition which rusuited in coupling fa d luro.

l The failed coupling was traced to a 1977 purchaso order (C003708) that purchased a total of 12 couplings from Dyron Jackson. All 12 couplings woro from tha name heat natch (llT / 8 213 3 6 ) and shop route slip ,

(R/ S164 34 0) . In addition, a purchase order i t. 1976 '

(co02470), that purchased a total of 18 couplings, contained one coupling with that same heat number. A so_ arch for the suspect couplings and their installation history was conducted. It- was enneluded that coupling from the suspect heat cou3d also be installed-in the IB

& 10 river water pumps.

The 1A rivnr water pump has boon refurbished with newly _

l purchased and lualified safety-related couplings that were tested to .4uro acceptability and verified not to be from the ausset batch, one of the now couplings was testod for hardness and impact resistance to cnsure its machanical proporties mout vendor requirements and the- impact resistanco exceed that of the failed coupling.

The failed coupling will be shipped to. Brookhaven Labs-for_ further examination as requested by 11R C staff personnel. Further ovaluations and discussions with '

the vendor are ongoing to obtain additional information on the coupling material.

(v) Dato on Which Doroot Identified:

The failure of the coupling in the 1A pump occurred on June 20, -1491. Pump disassembly' work was initiated on June 21, 1991. Dolays woro experienced due.to an availability of parts. Tho 1A pump repairs woro completed on August 29,_1991. Pump performance testing on September 4, 1991 failed due to low head at' required flow. The pump was disassembled on September 12, 1991.

P The lab analysis results on the failed coupling were roccived;on September-25, 1991. The documentation / traceability search for the suspect ,

couplings was completed - on October 17, 1991.- A BVPS Onsite Safety Committoo mooting was conducted on i October 24, 1991 and concluded the issue was reportablo under 10 CFR Part 21.

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Attachment 1

, . Page 3 (vi,) Number and Locatio" of Componontas Currently, the nuupact couplinga have boon replaced from the 1A river water pump. The 1 11 & 1C pumpo are undergoing dinasaembly and ropIncoment of the couplings.

Affected Components: WR-P-1A, "Roactor Plant River Water Pump" W R - P - l l) , "Roactor Plant River Water Pump" WR-P-10, "Roactor Plant River Water Pump" 4 i

Location: 1)VPS Unit 1 Intako Structuro (vii) Corrective Actiono Takon i

IWPS Unit-1 is presently nhat down. We are continuing i to ovaluate the matorial acceptability and failuro modo of the auspect couplings.  ;

Actionn that-Woro taken during ovaluation procoon  ;

include the following:

Metallurgical failuro analyalo of suupoet couplings.

- Replacement of the couplings in the 1A river water ,

pump ,

I: valuation of pump operating history and vibration tout data PRA analyois comparison with pump failure data Initiated INPO Nuclear Network mossago _to notify

• other liconneco of this locuo, Corrective actions which vill be taken'includo:-

Roplacement of tha ccalings in the 1 13 and lc river water pumpa.

- Shipment of the failed coupling to Brookhaven for further examination by NRC-staff personnel.

Further evaluation and discuusions -with vendor to

'dotormino, design adequacy of_the coupling material.

Other 1.dvice Rol'ated to Purchasers or Liconoces:

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