ML17256A658

Forwards Structural Reanalysis Program for Re Ginna Nuclear Power Plant, Per SEP Topics II-2.A,III-2,III-4.A & III-7.B. Final Design Expected to Require 18-24 Months.Final Installation Expected to Require 2 to 2-1/2 Yrs

ML17256A658
Person / Time
Site:	Ginna
Issue date:	04/22/1983
From:	Maier J ROCHESTER GAS & ELECTRIC CORP.
To:	Crutchfield D Office of Nuclear Reactor Regulation
Shared Package
ML17256A659	List: ML17256A658 ML17256A660
References
TASK-02-02.A, TASK-03-02, TASK-03-04.A, TASK-03-07.B, TASK-2-2.A, TASK-3-2, TASK-3-4.A, TASK-3-7.B, TASK-RR NUDOCS 8305030021
Download: ML17256A658 (6)

Text

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/Ã /// ////g////I 55A5E ROCHESTER GAS AND ELECTRIC CORPORATION e 89 EAST AVENUE, ROCHESTER, N.Y. 14649 JOHN E. MAILER TEI.EPHD>E Vice President AREA CODE jli5 546.2700 April 22, 1983 I

Director of Nuclear Reactor Regulation Attention: Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Structural Reanalysis Program, SEP Topics II-2.A, III-2, III-4.A, and III-7.B R. E. Ginna Nuclear Power Plant, Docket. No. 50-244

Dear Mr. Crutchfield:

In a letter from John E. Maier of RG&E to Dennis Crutchfield, NRC, RG&E proposed that an overall structural reanalysis be performed for the Ginna facility, integrated so as to incorporate findings in several SEP topics related to natural phenomena.

RG&E proposed a four-fold program, consisting of:

1) development of a suitable range of input parameters

2) development of reasonable acceptance criteria

3) definition of structures and systems requiring protection

4) value-impact assessment This reanalysis has been completed, and is provided in the attached report "Structural Reanalysis Program for the R. E. Ginna Nuclear Power Plant," April 1983. The report provides the methodol'ogy,employedto perform~ the structural- analysis, the results of the analyse's for a range 'of phenomenological loading conditions, the requirements for tornado missile protection, and RG&E's conclusions, based on an integrated evaluation of the results of the analysis. Also provided in the report is a dis-cussion of margins and reserve capacity, both in structural and systems terms, and a discussion of the safety benefits to be derived from RG&EIs proposed modifications.

RG&E has concluded that, for purposes of backfit design, tornado windgpeed characteristics associated with a probability level of 10 per year, at an upper 95th percent confidence level, should be used. Because of the low probability of such an 830503002i 830422 PDR ADOCK 05000244

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ROCHESTER GAS AND ELECTRI CORP. SHEET NO.

April 22, 1983 Mr. Dennis M. Crutchfield occurrence, RGB has in general used an acceptance, criteria associated with -"extreme" loading conditions of 1.6 times the allowable stress. In certain cases, RG&E proposes to utilize additional materials and safety system reserve capacity, which may make use of some of the margin. In all cases, however, RG6E will demonstrate that all require safety functions will be available, and margin to account. for uncertainties will be maintained.

The'ttached report provides the summary of information developed during the structural reanalysis program for SEP topics II-2.A, III-2, III-4.A and steel portions of III-7.B. The; details of the analysis, which are in the form of appendices to the attached report, are currently undergoing final review and will be provided under separate cover by the end of April 1983. Also, the concrete portion of the SEP III-7.B topic was not performed as an integral part of the Structural Reanalysis Program, but is being performed as a separate analysis. The report providing RGSE!s conclusions for the load, load combination, and code case changes for the concrete portions of the Ginna plant will also be provided by the end of April, review and approval of these reports by the NRC, 1983.'ollowing the final design is anticipated to require 18 to 24 months.

Final installation is expected to require 2 to 2 1/2 years after design is complete. Nork will be scheduled so that the most critical components and structures are addressed first.

Very truly yours, John E. Maier

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