ML20245C124

Forwards Request for Addl Info in Order to Complete Review of Util 860916 Proposed Tech Spec Amend Re Containment Structural Integrity

ML20245C124
Person / Time
Site:	Summer
Issue date:	06/29/1987
From:	Hopkins J Office of Nuclear Reactor Regulation
To:	Nauman D SOUTH CAROLINA ELECTRIC & GAS CO.
References
TAC-62803, NUDOCS 8707010652
Download: ML20245C124 (3)

Text

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e Docket No. 50-395 Mr. D. A. Nauman 'jgg "g n

3937 Vice President, Nuclear Operations South Carolina Electric & Gas Company P. O. Box 764 (Mail Code 167)

Columbia, South Carolina 29218

Subject:

V. C. SUMMER NUCLEAR STATION - CONTAINMENT STRUCTURAL INTEGRITY TAC No. 62803 By letter dated September 16, 1986, you submitted a proposed Technical Specifi- l cation amendment regarding containment structural integrity. We are reviewing that submittal and find that we require additional information (see enclosure) in order to complete our review. Contact me if you have any questions concerning this request.

This request is covered by Office of Management and Budget Clearance Number 3150-0011 which expires September 30, 1989. Comments on burden and duoli-cation may 'u directed t.o the Office of Management and Budget, Room 3208, New Executin Office Building, Washington, DC 20503.

Sincerely, b

Jon B. Hopkins, Project Manager Project Directorate 11-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation

Enclosure:

As Stated cc: See next page I

DISTRIBUTION:

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Enclosure i I

Structural and Geosciences Branch Request for Information i Changes to Technical Specification Virgil C. Summer Nuclear Station Doc'ket No. 50-395 l

1. It is indicated that the minimum required average. tendon force is revised i from 1195 kips to 1160 kips vertical tendons, from 1115 kips to 1065 q kips for dome tendons and from 1181 kips to 1000 kips for hoop tendons.

Provide the detailed calculations together with supporting data in obtaining the original as well as the revised values.

2. For the prestress loss methodology, mentioned in special report 85-021, it is indicated that there are two methods to account for the prestress loss: the interaction and the non-interaction approach. Provide sample calculations to illustrate the differences between the two approaches for the hoop, axial and dome tendons, respectively. The calculations should cover the prestress losses at one year, three year and five year surveil-lances. Indicate why the normalizing factors for the two approaches still remain the same.

3. For each tendon surveillance, provide more information with respect to l its detensioning and retensioning, specifically the hydraulic jack gauge J pressure reading, the jacking force and tendon elongation recorded respec-tively at lift-off, at 0.8f's and at 1 kip / wire or at other equivalent conditions together with the number of effective wires in a tendon and the ,

length of the tendon. The information as presented in special report J 85-021 is not sufficiently detailed for the-staff to assess the accept- 1 ability of the requested technical specification changes. The information ,

being requested should contain all the pertinent data ranging from the '

initial tendon installation to the most recent surveillance, i i

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Mr. D..A. Nauman South Carolina Electric & Gas Company Virgil C. Summer Nuclear Station cc:

Mr. William A. Williams, Jr. i Technical Assistant - Nuclear Operations Santee Cooper P.O. Box 764.(Mail Code 167)

Columbia, South Carolina 29218 J..B. Knotts, Jr., Esq.

Bishop, Liberman, Cook, Purcell and Rcynolds 1200 17th Street, N.W..

Washington, D._C. 20036 Resident Inspector /Sumer NPS c/o U.S. Nuclear Regulatory Commission Route 1, Box 64 Jenkinsville, South Carolina 29065 .

Regional Administrator, Region II U.S. Nuclear Regulatory Commission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Chairman, Fairfield County Council P.O. Box 293 Winnsboro, South Carolina 29180 Attorney General Box 11549 Columbia, South Carolina 29211 Mr. Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 .,