ML20094P192

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Forwards Response to GL 92-01,Rev 1,Suppl 1, Rv Structural Integrity
ML20094P192
Person / Time
Site: Grand Gulf 
Issue date: 11/20/1995
From: Hutchinson C
ENTERGY OPERATIONS, INC.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-92-01, GL-92-1, GNRO-95-00125, GNRO-95-125, NUDOCS 9511280353
Download: ML20094P192 (8)
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j Entsrgy Cpiretbns,Inc.

N RM' eo Box 756 FWt Gibson,MS 39150 Tel601437 2800 '

C. R. Hutchinson vre FMrkor November 20, 1995

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U.S. Nuclear Regulatory Comunission Document Control Desk Mail Stop P1-37 i

Washington, D.C. 20555-0001 l

Subjects Grand Gulf Nuclear Station Docket No. 50-416 License No. NPF-29 Response to Generic Letter 92-01, Revision 1, Supplement 1: " Reactor Vessel Structural Integrity" GNRO-95/00125 Gentlemen:

By letter. dated May 19, 1995, the USNRC issued Generic j

Letter (GL) 92-01, Revision 1, Supplement 1. This 3

generic letter contains four' items requiring responses

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from licensees resulting from review and assessment of l

- any new data pertinent to their existing RPV integrity i

analyses. The reporting requirements of this generic letter permitted licensees to submit staggered responses to these items due to the potential difficulties that j

may be encountered in ascertaining the information requested.

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.The'GGNS response'to part (1) of the required l-information listed in GL 92-01, Revision 1, Supplement 1 l

was submitted by letter dated August 14, 1995 [ Reference 1]. Attachment 1 to this submittal delineates the GGNS i

response to the remaining parts of the required i

information; parts (2), (3 ), ' and (4 ).

'As stated in our August 14, 1995 response to part (1),

the respcosas to parts (2), (3), and (4) are preliminarF. GGNS is participating in and endorse the 4

industry initiative to address RPV integrity issues denoted in GL 92-01, Revision 1, Supplement 1.

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UNRO-95/00125 2

Page 2 of 3 i

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Final evaluation of any new pertinent data for impact on the GGNS RPV integrity analyses is anticipated to be l

consistent with the action plan and schedule submitted by the BWRVIP [Refereace 2] and referenced in our August 4

14, 1995 submittal.

I We will apprise you of any new pertinent data impacting l

the GGN8 RPV integ;;ity analyses resulting from the industry initiativa, should such C*ta be identified. In i

the interim, the existing GGN8 RPV 11.tegrity analyses l

remain conservatively bounded by the latest data available as delineated in Reference 3 and submitted to 4

the NRC.

' provides the affirmation for the

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information provided in this response per the j

requirements of 10 CFR 50.54(f). Please contact Charles E.

Brooks at (601) 437-6555 should you have any l

1 questions, or require additional information.

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j attachments: 1) GGN8 Response to GL 92-01, Revision 1, Supplement 1 (parts 2, 3, and 4)

2) Affirmation per 10CFR50.54(f) cc Mr. H. W. Keiser (w/a)

Mr. R. B. McGehee (w/a)

Mr. R. 8. Reynolds (w/a) l Mr. J. E. Tedrow (w/a)

Mr. H. L. Thomas (w/a)

Mr. L. J. Callan (w/a) l Regional Administrator U. 8. Nuclear Regulatory Commission l

Region IV 611 Ryan Plaza Drive, Suite 400 i

Arlington, TX 76011 Mr. Paul W.

O'Connor, Project Manager (w/2) 4 Office of Nuclear Reactor Regulation U. 8. Nuclear Regulatory Commission Mail Stop 13H3 1

Washington, D. C.

20555 i

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I to GNRO-95/00125 4

Response to Generic Letter 92-01, Revision 1, Supplement 1 (Parts 2, 3, and 4)

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" Reactor Vessel Structural Integrity" 4

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Att0 chm:nt 1 to CNRO-95/00125 Pago 1 of 3 Grand Gulf Nuolear Station (GGNS)

Response to Generic Letter 92-01 Revision 1, Supplement 1

" Reactor Vessel Structural Integrity" Required Information Reauired Information Item 2 Provide an assessment of any change in best-estimate chemistry based on consideration of all relevant data.

GGNS Response to Item 2:

An assessment of best-estimate chemistry is a longer range industry effort. In the interim, data currently available to the BWRVIP, which includes GGNS plant specific data (Reference 3) have been used to determine bounding chemistries, since these current bounding chemistries are expected to be conservative compared to future best-estimate chemistries.

I Required Information Item 3 Provide a determination of the need for use of the ratio procedure in accordance with the established Position 2.1 of Regulatory Guide i

1.99, Revision 2.

For those licensees that use surveillance data, j

provide a basis for the RPV integrity evaluation.

GGNS Response to Item 3:

Position 2.1 of Regulatory Guide 1.99, Revision 2 establishes a method which can be used to adjust the beltline ARTmn calculation based on the results of at least two surveillance capsule tests. GGNS 4

has not tested a surveillance capsule, and consequently Item 3 is not 1

currently applicable.

Esauired Information Item 4:

I Provide a written report providing any newly acquired data as specified above and (1) the results of any necessary revisions to the evaluation of RPV integrity in accordance with the requirements of 10 CFR 50.60. 10 CFR 50.61, Appendices G and H to 10 CFR Part 50, and any potential impact on the LTOP or P-T limits in the technical specifications or (2) a certification that the previously submitted evaluations remain valid. Revised evaluations and certifications should include consideration of Position 2.1 of Regulatory Guide 1

1.99, Revision 2, as applicable, and any new data.

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AttScha nt 1 to CNRO-95/00125 Page 2 of 3 GGNS Response to Item 4:

Using bounding chemistries as the basis, the need to revise RPV integrity evaluations was assessed for all US BWR/2-6 plants, including GGNS. Reference 3 provides the written report delineating any newly acquired data. USE and P-T curve evaluations (10 CFR 50.60 and Appendices G and H to 10 CFR Part

50) are the only RPV integrity evaluations that need to be evaluated for BWRs based on their inherent operating characteristic, i.e.,

operation with a large water inventory at saturated steam conditions.

Section 2.0 of the BWRVIP report [ Reference 3] provides a discussion of the USE issue. As seen from Table 2-1 of Reference 3, the EMA analysis for USE remains bounding for GGNS.

Variability in weld chemistry has the potential to impact the degree of conservatism in the P-T curves in BWR plants Technical Specifications. As depicted in Table 3-1 of the BWRVIP report (Reference 3], GGNS is classified as a plant whose beltline welds have " acceptable variability" in chemistry and need not be evaluated for the impact of variabilities in weld chemistry on GGNS P-T curves.

As such, we certify that the previously submitted evaluations remain valid.

Attacha nt 1 to CNRO-95/00125 Page 3 of 3 I

i References i

1.

Letter from C. R. Butchinson (Batergy Operations, Inc. - GGNS) to the U.

5. Nuclear Regulatory Commission, " Response to Generic Letter 92-01, Revision 1, Supplement 1, " Reactor Vessel structural Integrity", dated August 14, 1995.

4 2.

Letter from J. T. Beckham, Jr. (Chairman, BWRVIP) to the U.

8.

Nuclear Regulatory Commission, "BWRVIP Response to Generic Letter i

92-01, Revision 1, Supplement 1,

" Reactor Vessel Structural Integrity", dated August 10, 1995.

j 3.

Letter from J. T. Beckham, Jr. (Chairman, BWRVIP) to the U.

8.

i Nuclear Regulatory Commission, "BWRVIP Response to Information i

Requests in Generic Later 92-01, Revision 1, Supplement 1, j

" Reactor Vessel Structural Integrity", dated November 15, j

1995.[2PRI Report TR-105908]

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1 GNRO-95/00125 Response to Generic Letter 92-01, Revision 1, Supplement 1 j-(Parts 2, 3, and 4)

Reactor Vessel Structural Integrity" 1

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Affirmation Per 10CFR50.54 (f) i l

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CEFORE THE UNITED STATES NUCLEAR REGULATORY COMMISSION LICENSE NO. NPF-29 2

DOCKET NO. 50-416 IN THE MATTER OF i

MISS%SSIPPI POWER & LIGHT COMPANY and SYSTEM ENERGY RESOURCES, INC.

and j

SOUTE MISSISSIPPI ELECTRIC POWER ASSOCIATION j

and ENTERGY OPERATIONS, INC.

l AFFIRMATION j

I, C. R. Hutchinson, being duly sworn, state that I am Vice President, Operations GGNS of Entergy Operations, Inc.; that on behalf of Entergy Operations, Inc., System Energy Resources, Inc., and South Mississippi Electric Power Association I am authorized by Entergy Operations, Inc. to sign and file with the i

Nuclear Regulatory Commission, this response to Generic _Latter 92-01, Revision 1, supplement i for the Grand Gulf Nuclear l

Station; that I signed this response as Vice President, Operations GGNS of Entergy Operations, Inc., and that the statements made and the matters set forth therein are true and correct to the best of my knowledge, info tio lief.

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d U(T. 4. Bdtcliinson l

STATE OF MISSISSIPPI COUNTY OF CLAIBORNE SUBSCRIBED AND SWORN TO before me, a Notary Public, in and for the Coupty and State above named, this 284, day of

/VOvemdet-1995.

l (SEAL) 827T8_.,

I Notary Public EBBISSIFFI STATEWIDE NOTARY I"GUC

. E COMMISSION EIPIRES Jmt 5 h;h W STEGAllNOT/Jt7 ci i

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