ML20216D010

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Summary of 980423 Meeting W/Listed Attendees to Present Info on B&Wog Reactor Vessel Internals Program & B&Wog Control Rod Drive Mechanism Motor Tube Program
ML20216D010
Person / Time
Issue date: 05/06/1998
From: Birmingham J
NRC (Affiliation Not Assigned)
To: Essig T
NRC (Affiliation Not Assigned)
References
NUDOCS 9805190475
Download: ML20216D010 (65)


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UNITED STATES

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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20666-0001 A

May 6, 1998 MEMORANDUM TO: Thomas H. Essig, Acting Chief Generic issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation FROM:

. Joseph L. Birmingham, Project ManagerM d Generic issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation

SUBJECT:

SUMMARY

OF APRIL 23,1998, MEETING WITH THE BABCOCK &

WILCOX OWNERS GROUP On April 23,1998, representatives of the Babcock and Wilcox Owners Group (B&WOG) met with U.S. Nuclear Regulatory Commission (NRC) staff to present information on the B&WOG Reactor Vessel internals Program (RVIP) and also the B&WOG Control Rod Drive Mechanism (CRDM) Motor Tube Program. A discussion of the two plans follows.

The RVIP consists of four task areas (1) irradiation-assisted stress corrosion cracking issues, (2) stress corrosion cracking issues, (3) stress relaxation issues, and (4) irradiation embrittlement. Under the plan, B&WOG will review data such as fabrication and manufacturing history, laboratory testing, analysis of withdrawn capsule and bolt material, and industry data to assess the susceptibility of the components to degradation. Based on a comprehensive

- evaluation of the reactor vessel internal components, B&WOG will rank the component items for safety concems and identify critical locations. A specific action of the RVIP is participation in a joint owners group evaluation of reactor vessel baffle former bolts.. The B&WOG discussed this participation in some detail presenting actions performed to date and plans for future analyses.

Regarding the baffle former bolts, the NRC staff noted that NRC Information' Notice 98-11

" Cracking of Reactor Vessel Internal Baffle Former Bolts in Foreign Plants," dated March 25, 1998, had been issued on this subject. The staff commented that licensee processes should f

lead them to consider the need for an operability determination of the affect of potentially J

degraded baffle former bolts on their plants. The staff asked when B&WOG expected to

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complete the safety assessment of the baffle former bolt issue. The B&WOG indicated that it expected to complete a safety assessment about June 30,1998 and provide a report to NRC.

The staff commented that an assessment of the need for bolt inspections may be appropriate f3

.when more information was available.

For the CRDM Motor Tube Program, B&WOG described the three basic designs of the motor tubes, the type and qualification of the welds used for the motor tubes, and the manufacturing sources of the motor tubes. B&WOG plans to review fabrication and inspection records and to ff5 9fl0b

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T. Essig May 6, 1998 inspect the welds of a number of irradiated and unirradiated tubes of each type. To date, over 75 CRDM tubes have been inspected and no reportable indications have been found. B&WOG plans to continue examining fabrication records such as design drawings and procedures and to review fabrication process changes, certified material test reports of base materials and weld wire, welder identification records, heat treatment records, NDE records, and weld repair records B&WOG will share information on this issue with other owners groups and participate in a joint owners group paper on the CRDM motor tubes. A preliminary safety assessment by B&WOG found that (1) defects in other motor tubes is improbable, (2) if a crack developed in a motor tube it would most likely be detected by existing leak detection measures, and (3) the effect of a control rod ejection is within the B&WOG design basis. B&WOG expects to complete its current activities and submit a final report to the NRC about June 19,1998.

Those who attended the meeting are listed in Attachment 1 and the viewgraphs presented at the meeting are in Attachment 2.

Attachments: As stated cc w/atts:

Mr. W. W. Foster, Chairman Mr. W. R. Gray, Manager B&WOG Materials Committee B&WOG Materials Committee Director of Safety Assurance Framatome Technologies, Inc.

Duke Power Company PO Box 10935 Oconee Nuclear Station Lynchburg, VA 24506 PO Box 1439 Mail Code OF 57 Seneca. SC 29679 l

l l

l

e T. Essig

-2 May 6, 1998 inspect the welds of a number of irradiated and unirradiated tubes of each type. To date, over 75 CRDM tubes have been inspected and no reportable indications have been found; B&WOG

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plans to continue examining fabrication records such as design drawings and procedures and to review fabrication process changes, certified material test reports of base materials and weld I

wire, welder identification records, heat treatment records, NDE records, and weld repair records. B&WOG will share information on this issue with other owners groups and participate in a joint owners group paper on the CRDM motor tubes. A preliminary safety assessment by

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B&WOG found that (1) defects in other motor tubes is improbable, (2) if a crack developed in a motor tube it would most likely be detected by existing leak detection measures, and (3) the effect of a control rod ejection is within the B&WOG design basis. B&WOG expects to complete its current activities and submit a final report to the NRC about June 19,1998.

Those who attended the meeting are listed in Attachment 1 and the viewgraphs presented at the meeting are in Attachment 2.

Attachmer,ts: As stated l

cc w/atts:

Mr. W. W. Foster, Chairman Mr. W. R. Gray, Manager B&WOG Materials Committee B&WOG Materials Committee Director of Safety Assurance Framatome Technologies, Inc.

Duke Power Company PO Box 10935 Oconee Nuclear Station.

Lynchburg, VA 24506 PO Box 1439

' Mail Code OF 57-Seneca, SC 29679 i

DISTRIBUTION: See attached page Document Name: G:ULB\\04-23MTG. SUM

/[

OFFICE PGEB g f fj SC:P,GEh[

NAME JBirmi[gham:sw FAkhwicz DATE 5/6/98 5/[, /9h

DISTRIBUTION: Mtg. Summary w/B&WOG Dated May 6, 1998 Hard Copy Central File (w/atts 1&2)

PUBLIC PGEB r/f OGC ACRS R. Hermann F. Grubelich E-Mail (w/atti)

S. Collins F. Miraglia R. Zimmerman B. Boger B. Sheron J. Roe D. Matthews T. Essig F. Akstulewicz G. Holahan J. Mitchell R. Wessman T. Sullivan I

l G. Hornseth W. Liu C. Carpenter C. Smith T. Colburn i

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Attendees for B&WOG Meeting with i4RC April 23,1998 NAME ORGANIZATION Bill Foster B&WOG Materials Committee (Chairman)

Dan Spond Entergy Operations David Masiero GPU Nuclear Richard Miller GPU Nuclear Bob Reynolds Florida Power Corp.

Roger Newton WEPCO David Whitaker Duke Power Jody Shuping Duke Power Karl Jacobs New York Power Authority David Forsyth Westinghouse William Gray Framatome Technologies, Inc. (Framatome)

Frank Gregory Framatome Robert Borsum Framatome Patrick F. Williams Framatome Martin Parece Framatome Steve Fyfitch Framatome Josepi Biimingham NRC\\NRR\\DRPM Dick Wessman NRC\\NRR\\EMEE-Ted Sullivan NRC\\NRR\\EMCB Geof Hornseth NRC\\NRR\\EMCB Bob Hermann NRC\\NRR\\EMCB Frank Grubelich NRC\\NRR\\EMEB Wan C. Liu NRC\\NRR\\DRPM C. E. Carpenter NRC\\NRR\\PDLR Craig Smith NRC\\NRR\\DRPE Timothy G. Colburn NRC\\NRR\\DRPE

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