ML20097H153

Part 21 Rept Re Defect in MSIV Poppets Supplied to Plant by Atwood & Morrill Co,Inc.Post Weld Heat Treatment Prescribed & Performed for Poppet to Alleviate Concerns Re Residual Stresses Present.Next Rept Will Be Submitted within 30 Days

ML20097H153
Person / Time
Site:	Perry
Issue date:	05/22/1992
From:	Gaston R CLEVELAND ELECTRIC ILLUMINATING CO.
To:	NRC
References
REF-PT21-92 NUDOCS 9206240217
Download: ML20097H153 (3)

Text

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Perry Nuclear Pover Plant Fax No. (216) 259-2010

.10' Center Road Licensee

Contact:

Perry, OH 44081 Henry Hegrat, Compliance Supervisor Docket No. 50-440 (216) 2$9-3737 Extension 5185 PRELIMINARY 10CFR21 NOTIFICATION TO REPORT DEFECTS IN MAIN STEAM ISOLATION VALVE POPPETS SUPPLIED BY ATV00D & MORRILL This notification is being submitted pursuant to the requirements of 10CPR21.21(c)(3)(1) to report a defect in Main Steam Isolation Valve (MSIV) poppets supplied to the Perry Nuclear Power Plant (PNPP) by Atwood and Morrill Company, Incorporated.

A total of eleven (11) poppets vere ordered from Atwood & Horrill (A&M) as part of a design improvement for the PNPP HSIVs. At <he time of discovery of the defect, 9 of the 11 poppets had been teceived and receipt incpected. The poppets were received during the period September S to Detecter 3, 1991. On April 1, 1992 a linear indication was observed in the Stellite 21 hardfaced seating surface of a poppet identified as serial number (S/N) 5. This poppet vas returned to the vendor for repair. The remaining 8 poppets vore visually inspected by April 5, 1992 and revealed no signs of cracking.

On April 8, 1992, a crack vas discovered on the seating surface of poppet S/N 4. Subsequent visual and liquid penetrant testing of the other poppets revealed additional cracks in poppets S/N 6 and S/N 12. All poppets with identified erneking vore returned to AEH for repair and a hold was placud on the shipment of the 2 poppets (S/N 2 and S/N 9) which had not been received.

A6H vas also requested to provide a root cause analysis to identify the source of the cracking and to provide justification to support the use of the 5 poppets which did not experience cracking.

The evaluation performed by A&M concluded that the cracking in the hardfacing material was caused by the excessive build-up of residual stresses tua to multiple repair velds in the poppet nose / seating _ area and a substantial increase in the overall thickness of the hardfacing. These factors were common to all of the poppets, for which the cracking vas observed an did not exist for the poppets evaluated as acceptable for service (S/Ns 3, 7, 8. and ID).

Poppet S/N 11 did not exhibit cracking, but had experienced one major repair in the nose / seating area. Post veld heat treatment van prescribed and performed for this poppet to alleviate concerns regardirig . esidual streases which may have been present. A successful PT examinati9ti was subsequently completed and poppet S/N 11 was determined to be acceptable for service.

Poppets identified as S/Ns 3, 7, 8, 9, 10, and 11 are currently installed in the plant.

A vritten report which includes additional details concerning the subject defects vill be submitted within 30 days as required by 10CFR21.21(C)(3)(ii).

Should you require additional information prior to that time, please contact Henry Hegrat, compliance Supervisor, at (216) 259-3737, extension 5185.

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