ML20056H587

Discusses Util 10-yr ISI for Plant & Staff Conclusion That Plant Can Be Safely Returned to Operation & Acceptable for Continued Svc Subj to Meeting Requirements of ASME Code

ML20056H587
Person / Time
Site:	Mcguire
Issue date:	08/27/1993
From:	Matthews D Office of Nuclear Reactor Regulation
To:	Mcmeekin T DUKE POWER CO.
References
TAC-M87204, NUDOCS 9309100133
Download: ML20056H587 (3)

Text

August 27, 1993 l

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Docket No. 50-370 DISTRIBUTION Docket File OGC Mr. T. C. McMeekin PDII-3 R/F L. Berry Vice President, McGuire Site NRC/ Local PDRs R. Martin l

Duke Power Company S.Varga 12700 Hagers Ferry Road (MG01A)

G.Lainas Huntersville, North Carolina 28078-8985 D.Matthews J.Strosnider

Dear Mr. McMeekin:

E.Merschoff,RII

SUBJECT:

INSPECTION OF MCGUIRE NUCLEAR STATION, UNIT 2, REACTOR VESSEL (TAC NO. M87204)

The Duke Power Company (DPC) conducted a 10-year Inservice Inspection (ISI) for the McGuire Nuclear Station, Unit 2, as required by ths Technical Specifications (TS) and the ASME Code during its end-of-cycle number eight (E0C 8) refueling outage. During this inspection, a longitudinal planar flaw was detected using ultrasonic examination at the lower head-to-ring segment girth weld on the outer wall surface of the reactor vessel as discussed in DPC's August 18, 1993, letter. The indication was determined to exceed the allowable flaw size for acceptance by volumetric examination and to require analytical evaluation in accordance with Section XI of the ASME Code.

b The August 18, 1993, letter also provided attachments describing the calculations and evaluations of the flaw in response to Section XI of the ASME Code, information on the fabrication and inspection history of the weld, and information on the ultrasonic examination results and techniques of l

examination. DPC's letter of August 25, 1993, updated the attachments to the August 18, 1993 letter. DPC's letter of August 26, 1993, provided further fracture mechanics analysis regarding uncertainties in the examination techniques. These DPC reports conclude that the reactor vessel is acceptable for continued service for the licensed life of McGuire Nuclear Station, Unit 2 (until March 3, 2023), based on meeting the applicable requirements of the ASME Code. Duke Power also committed to additional inspections of the indication as required by IWB-3122.4(b), and IWB-2420(b) and (c).

Based on the NRC staff's review of this information, we have concluded that i

McGuire Nuclear Station, Unit 2, can be safely returned to operation and is l

acceptable for continued service subject to meeting the requirements of the ASME Code and the TS as discussed above. A safety evaluation which provides l

the basis for the above conclusion will be transmitted under separate cover.

l Sincerely, ORIGINAL SIGNED BY R.E. MARTIN FOR David B. Matthews, Director U " (' (" "

Project Directorate 11-3 Division of Reactor Projects - I/II l

Office of Nuclear Reactor Regulation cc: See next page l

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^"9" Dock No. 50-370 Mr. T. C. McMeekin 4

1 Vice President, McGuire Site I

Duke Power Company 12700 Hagers Ferry Road (MG01A)

Huntersville, North Carolina 28078-8985

SUBJECT:

INSPECTION OF MCGUIRE NUCLEAR STATION, UNIT 2, REACTOR VESSEL (TAC NO. M87204) i The Duke Power Company (DPC) conducted a 10-year Inservice Inspection (ISI)

J for the McGuire Nuclear Station, Unit 2, as required by the Technical Specifications (TS) and the ASME Code during its end-of-cycle number eight (E0C 8) refueling outage. During this inspection, a longitudinal planar flaw was detected using ultrasonic examination at the lower head-to-ring segment girth weld on the outer wall surface of the reactor vessel as discussed in DPC's August 18, 1993, letter. The indication was determined to exceed the allowable flaw size for acceptance by volumetric examination and to require analytical evaluation in accordance with Section XI of the ASME Code.

l The August 18, 1993, letter also provided attachments describing the calculations and evaluations of the flaw in response to Section XI of the ASME Code, information on the fabrication and inspection history of the weld, and information on the ultrasonic examination results and techniques of examination. DPC's letter of August 25, 1993, updated the attachments to the August 18, 1993 letter. DPC's letter of August 26, 1993, provided further fracture mechanics analysis regarding uncertainties in the examination techniques. These DPC reports conclude that the reactor vessel is acceptable for continued service for the licensed life of McGuire Nuclear Station, Unit 2 (until March 3, 2023), based on meeting the applicable requirements of the ASME Code. Duke Power also committed to additional inspections of the indication as required by IWB-3122.4(b), and IWB-2420(b) and (c).

Based on the NRC staff's review of this information, we have concluded that McGuire Nuclear Station, Unit 2, can be safely returned to operation and is acceptable for continued service subject to meeting the requirements of the ASME Code and the TS as discussed above. A safety evaluation which provides the basis for the above conclusion will be transmitted under separate cover.

Sincerely, Y$

7 avid B. Matthews, Director Project Directorate II-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation i

cc: See next page o

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. o Mr. T. C. McNeekin Duke Power Company McGuire Nuclear Station I

cc:

l Mr. A. V. Carr, Esquire Mr. Dayne H. Brown, Director Duke Power Company Department of Environmental, 422 South Church Street Health and Natural Resources Charlotte, North Carolina 28242-Division of Radiation Protection 0001 P. O. Box 27687 1

Raleigh, North Carolina 27611-7687 County Manager of Mecklenberg County 720 East Fourth Street Mr. Alan R. Herdt, Chief Charlotte, North Carolina 28202 Project Branch #3 I

U. S. Nuclear Regulatory Comission Mr. R. O. Sharpe 101 Marietta Street, NW. Suite 2900 Compliance Atlanta, Georgia 30323 Duke Power Company i

McGuire Nuclear Site Ms. Karen E. Long 12700 Hagers Ferry Road Assistant Attorney General Huntersville, NC 28078-8985 North Carolina Department of Justice i

J. Michael McGarry, III, Esquire P. O. Box 629 Winston and Strawn Raleigh, North Carolina 27602 1400 L Street, NW.

l Washington, DC 20005 Mr. G. A. Copp i

Licensing - EC050 Senior Resident Inspector Duke Power Company c/o U. S. Nuclear Regulatory P. O. Box 1006 l

Commission Charlotte, North Carolina 28201-i 12700 Hagers Ferry Road 1006 j

Huntersville, North Carolina 28078 1

Regional Administrator, Region II l

Mr. T. Richard Puryear U.S. Nuclear Regulatory Commission i

Nuclear Technical Services Manager 101 Marietta Street, NW. Suite 2900 Westinghouse Electric Corporation Atlanta, Georgia 30323 Carolinas District 2709 Water Ridge Parkway, Suite 430 Charlotte, North Carolina 28217 Dr. John M. Barry Mecklenberg County Department of Environmental Protection 700 N. Tryon Street Charlotte, North Carolina 28202 i

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