ML20126A046

Advises That Util Actions Resolve Issues Identified in Bulletin 88-02 as Documented in & Acceptable,Subj to Development of Administrative Controls to Ensure That Updated Stress Ratio & Fatigue Usage Calculations Performed

ML20126A046
Person / Time
Site:	McGuire, Mcguire
Issue date:	12/09/1992
From:	Tim Reed Office of Nuclear Reactor Regulation
To:	Mcmeekin T DUKE POWER CO.
References
IEB-88-002, IEB-88-2, TAC-M76654, NUDOCS 9212170207
Download: ML20126A046 (4)

Text

_ _ _ _ - . - - -

' ~

December 9, 1992 i

Docket Hos. 50-369 DISTRIBUTION: EJordan, MNBB3701 and 50-370 Docket File OGC, 15B18 NRC/ Local PDRs ACRS (10), P-315 PDil-3 R/F EMerschoff, RII Mr. T. C. McHeekin McGuire R/F FWilliams, 1482 Vice President, McGuire Site Treed HConrad, 7D4 Duke Power Company LBerry JStrosnider, 7D3 12700 Hagers Ferry Road DMatthews Huntersville, North Carolina 28078-8985 SVArga Glainas

SUBJECT:

WESTINGHOUSE REASSESSMENT OF BULLETIN 88-02 FOR MCGUIRE NUCLEAR STATION UNIT 2 (TAC NO. M76654)

McGuire Unit 2 was identified by Westinghouse as one of the plants requiring an update of the steam generator tube fatigue evaluations performed by Westinghouse in response to NRC Bulletin 88-02. The update was required as a result of NRC concerns regarding the accuracy of the antivibration bar insertion depth estimates and the associated flow peaking factor estimates.

Your letter of February 1,1991 provided the reassessment which concluded that no tubes have peaking ratios large enough to cause the stress ratio to be greater than unity and, therefore, are not expected to be susceptible to high cycle fatigue rupture as occurred at North Anna Unit 1.

The staff concludes that your actions resolve the issues identified in Bulletin 88-02 and are, therefore, acceptable. This finding is subject to the development of administrative controls by you to ensure that updated stress ratio and fatigue usage calculations are performed in the event of any significant changes to the steam generator operating parameters (e.g., steam pressure and flow, circulation ratio) relative to those assumed in the WCAP analysis. Implementation of the additional administrative controls may be subject to verif ;ation by NRC inspection. If, for any reason, you do not plan to implement such administrative controls, please advise us within 30 days of receipt of this letter.

Your facility is no longer subject to the enhanced primary-to-secondary leak rate monitoring program required by item C.l. of the bulletin. This completes our action on this issue and closes TAC No. M76654.

Sincerg, Timothy A. Reed, Project Manager Project Directorate 11-3 Division of Reactor Projects-I/II Office of Nuclear Reactor Regulation cc: See next page -

[

PDil-3:LA. :PM BC:EMCB D: -

LBerry lef [Qbed:cw OJStrosnider Dbtthews

// //f/92 // /(j /92 jL/7/92 @/ /92 DOCUMENT NAME: G:\MCGUIRE\ BULL 8802 14002J ,

9212170207 PDR 921209 '/

O ADOCK 05000369  ; I PDR i

December 9, 1992 l

h Docket Nos. 50-369 DISTRI(LUl!ON: EJordan, MNBB3701 and 50-370 Docket File OGC, 15B18 NRC/ Local PDRs ACRS (10), P-315 PDII-3 R/F EMerschoff, RII Mr. T. C. McHeekin McGuire R/F FWilliams, 1482 Vice President, McGuire Site Treed HConrad, 7D4 Duke Power Company LBerry JStrosnider, 7D3 12700 Hagers Ferry Road DMatthews Huntersville, North Carolina 28078-8985 SVArga Glainas

SUBJECT:

WESTINGHOUSE REASSESSMENT OF BULLETIN 88-02 FOR MCGUIRE NUCLEAR STATION UNIT 2 (TAC N0. M76654)

McGuire Unit 2 was identified by Westinghouse as one of the plants requiring an update of the steam generator tube fatigue evaluations performed by Westinghouse in response to NRC Bulletin 88-02. The update was required as a re"ilt of NRC concerns regarding the accuracy of the antivibration bar i ertion depth estimates and the associated flow peaking factor estimates.

Your letter of February 1,1991 provided the reassessment which concluded that no tubes have peaking ratios large enough to cause the stress ratio to be greater than unity and, therefore, are not expected to be susceptible to high cycle fatigue rupture as occurred at North Anna Unit 1.

The staff concludes that your actions resolve the issues identified in Bulletin 88-02 and are, therefore, acceptable. This finding is subject to the development of administrative controls by you to ensure that updated st-ess ratio and fatigue usage calculations are performed in the event of any significtnt changes to the steam generator operating parameters (e.g., am pressure and flow, circulation ratio) relative to those assumed in the  ?

analysis. Implementation of the additional administrative controls ma.

subject to verification by NRC inspection. If, for any reason, you do m plan to implement such administrative controls, please advise us within 30 days of receipt of this letter.

Your facility is no longer subject to the enhanced primary-to-secondary leak rate monitoring program required by item C.l. of the bulletin. This completes our action on this issue and closes TAC No. M76654.

Sincerg, Timothy A. Reed, Project Manager Project Directorate 11-3 Division of Reactor Projects-I/II Office of Nuclear Reactor Regulation cc: See next page ( [

PDII-3:L . P :PM BC:EMCB -3 LBerry - ed:cw JStrosnider Dlatthews Di

// //f/92 // /lj /92 p/7/92 ) 7/ /92 DOCUMENT NAME: G:\MCGUIRE\ BULL 8802

/  %; UNITED STATES 8 n NUCLEAR REGULATORY COMMISSION q  ! ,1 W ASHINGTON, D. C. 20$$5

/ December 9, 1992 Docket Nos. 50-369 and 50-370 Mr. T. C. McHeekin Vice President, McGuire Site Duke Power Company 12700 Hagers Ferry Road Huntersville, North Carolina 28078-8985

SUBJECT:

WESTINGHOUSE REASSESSMENT OF BULLETIN 88-02 FOR MCGUIRE NUCLEAR STATION UNIT 2 (TAC NO. M76654)

McGuire Unit 2 was identified by Westinghouse as one of the plants requiring an update of the steam generator tube fatigue evaluations performed by Westinghouse in response to NRC Bulletin 88-02. The update was required as a result of NRC concerns regarding the accuracy of the antivibration bar insertion depth estimates and the associated flow peaking factor estimates.

Your letter of February 1, 1991 provided the reassessment which cone.luded that no tubes have peaking ratios large enough to cause the stress ratio to be greater than unity and, therefore, are not expected to be susceptible to high cycle fatigue rupture as occurred at North Anna Unit 1.

The staff concludes that your actions resolve the issues identified in Bulletin 88-02 and are, therefore, acceptable. This finding is subject to the development of administrative controls by you to ensure that updated stress ratio and fatigue usage calculations are performed in the event of any significant changes to the steam generator operating parameters (e.g., steam pressure and flow, circulation ratio) relative to those assumed in the WCAP analysis. Implementation of the additional administrative controls may be subject to verification by NRC inspection. If, for any reason, you do not plan to implement such administrative controls, please advise us within 30 days of receipt of this letter.

Your facility is no longer subject to the enhanced primary-to-secondary leak rate monitoring program required by item C.l. of the bulletin. This completes our action on this issue and closes TAC No. M76654.

S rely, Timothy A. Reed, Project Manager Project Directorate 11-3 Division of Reactor Projects-I/II Office of Nuclear Reactor Regulation cc: See next page i

Mr. T. C. McHeekin Duke Power Company McGuire Nuclear Station cc:

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 28242-0001 Division of Radiation Protection P. O. Box 27687 County Manager of Mecklenberg County Raleigh, North Carolina 27611-7687 720 East Fourth Street Charlotte, North Carolina 28202 Mr. Alan R. Herdt, Chief Project Branch #3 Mr. R. O. Sharpe U. S. Nuclear Regulatory Commission Compliance 101 Marietta Street, NW. Suite 2900 Duke Power Company Atlanta, Georgia 30323 McGuire Nuclear Site 12700 Hagers Ferry Road Ms. Karen E. Long Huntersville, NC 28078-8985 Assistant Attorney General North Carolina Department of J. Michael McGarry, III, Esquire Justice Winston and Strawn P. O. Box 629 1400 L Street, NW. Raleigh, North Carolina 27602 Washington, DC 20005 Mr. R. L. Gill, Jr.

Senior Resident Inspector Licensing c/o V. S. Nuclear Regulatory Duke Power Company Commission P. O. Box 1006 12700 Hagers Ferry Road Charlotte, North Carolina 28201-1006 Huntersville, North Carolina 28078 Regional Administrator, Region II-Mr, T. Richard Puryear U.S. Nuclear Regulatory Commission Nuclear Technical Services 101 Marietta Street, NW. Suite 2900 Manager Atlanta, Georgia 30323 Carolinas District Westinghouse Electric Corporation P. O. Box 32817-Charlotte, North Carolina 28232 Dr. John M. Barry Mecklenburg County Department of Environmental Protection 700 N. Tryon Street Charlotte, North Carolina 28202