ML20138J993

Forwards RAI Re 15 Yr Tendon Surveillance Rept for Listed Plant Containment Bldg

ML20138J993
Person / Time
Site:	Summer
Issue date:	05/07/1997
From:	Andrea Johnson NRC (Affiliation Not Assigned)
To:	Gabe Taylor SOUTH CAROLINA ELECTRIC & GAS CO.
References
TAC-M96490, NUDOCS 9705090226
Download: ML20138J993 (3)

Text

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May 7, 1997

Mr. Gary J. Taylor >

Vice President, Nuclear Operations South Carolina Electric & Gas Company ,

Virgil C. Summer Nuclear Station ,

Post Office Box 88 Jenkinsville, South Carolina 29065

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i

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - FIFTEEN-YEAR TENDON l SURVEILLANCE REPORT FOR VIRGIL C. SUMMER NUCLEAR STATION (TAC NO. M96490)

Dear Mr. Taylor:

On August 8,1996, upon request, you submitted to the NRC the fifteen-year 3hysical surveillance report for the V.C. Summer Nuclear Station containment

auilding. More information is needed to complete our review and a request for additional information is enclosed.

1 If you have any questions, please do not hesitate to contact me at (301) 415-i 1497.

Sincerely. ,

(Original Signed By)

Allen R. Johnson, Project Manager Project Directorate II-1 Division of Reactor Projects - I/II i Office of Nuclear Reactor Regulation ]

i Docket No. 50-395

Enclosure:

Request for Additional Information Distribution

_ Docket-File ~ I PUBLIC g

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L.Reyes, RII A. Belisle, RII DOCUMENT NAME: G:\ SUM 96490.LTR Ta receive a copy of this document. indicate in the boa: "C" = Copy unthout attachment / enclosure *E* = Copy with attachment / enclosure *N* = No/$py/ /

OFFICE PDII-1/LA lF PDII-1/PM _ / lF l PDII 1/D # / ( /'" l NAME0 EDunnington , 6 70 AJohnson Il K h Mark Reinhart V ,

05/ (//97 V DATE 05/ ( /97 _ . _

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OFFICIAL RECORD COPY '[

9705090226 970507 PDR ADOCK 05000395 P PDR m

_ _ _ _ _ _ _ _ . ___ _ _ ._ _._ ._.__ . _ ._. _ . _ . _ . .- _ _. _ _ m..__ _ .

Mr. Gary J. Taylor VIRGIL C. SUMMER NUCLEAR STATION South Carolina Electric & Gas Company cc:

Mr. R. J. White .

Nuclear Coordinator S.C. Public Service Authority c/o Virgil C. Summer Nuclear Station Post Office Box 88, Mail Code 802 .

Jenkinsville, South Carolina 29065 J. B. Knotts, Jr., Esquire Winston & Strawn Law Firm

'1400 L Street, N.W.

Washington, D.C. 20005-3502 Resident Inspector / Summer NPS c/o U.S. Nuclear Regulatory Commission  :

Route 1, Box 64  !

Jenkinsville, South Carolina 29065 '

Regional Administrator, Region II ,

U.S. Nuclear Regulatory Commissien  ;

Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85 Atlanta, Georgia 30303 Chairman, Fairfield County Council Drawer 60 Winnsboro, South Carolina 29180 Mr. Virgil R. Autry. ,

Director of Radioactive Waste Management Bureau of Solid & Hazardous Waste Management t Department of Health & Environmental Control '

2600 Bull Street .

Columbia, South Carolina 29201 Mr. Robert M. Fowlkes, Manager Operations South Carolina Electric & Gas Company Virgil C. Summer Nuclear Station, Mail- Code 303 Post Office Box 88 '

Jenkinsville, South Carolina 29065 Ms. April'R. Rice, Manager Nuclear Licensing & Operating Experience South Carolina Electric & Gas Company Virgil C. Summer Nuclear Station, Mail Code 830 Post Office Box 88 Jenkinsville, South Carolina 29065

ENCLOSURE ,

RE0UEST FOR ADDITIONAL INFORMATION VIRGIL C. SUMMER NUCLEAR STATION FIFTEEN-YEAR TENDON SURVEILLANCE REPORT

1. In the Introduction of your Resort on the Fifteenth Year Physical Surveillance of the V. C. Summer Jnit 1 Containment Building, in the second sentence in the third paragraph from the top you stated "The surveillance was conducted in accordance with South Carolina Electric and Gas Company's '

Specification SP-228-044461-0000 Rev.1. Regulatory Guide (RG) 1.35 Pro)osed  :

Revision (PR) 3 and PSC Surveillance Manual." Section 7.2 of RG 1.35 P1 3 stipulates. "During detensioning and retensioning of tendons (regulatory  !

position 4.2), if the elongation correspondin to a specific load differs by more than 5% from that recorded during instal ation of tendons, an investigation should be made to ensure that such difference is not related to wire failure or slip of wires in anchorage." Regulatory Position 4.2 requires: "The simultaneous measurement of elongation and jacking force during s retension should be made at a minimum of three approximately equally spaced '

levels of force between the seating force and zero." Evidently you had not performed what you implied in stating the surveillance was conducted in ,

accordance with RG 1.35 PR 3. However, you emphatically stated that you had followed Section 7.2 of RG 1.35 PR 3 by making force-elongation comparison between the initial installation and retensioned tendons for the first five tendon surveillances. Since such information would also be very useful for evaluating your performance of tendon surveillance, provide the force and the corresponding elongation at installation and at retension for each of the retensioned tendons for the five surveillances, and the pertinent comparison.

2. In your response to Question 2 of our first request for additional information on this subject, you did not answer the second part of the question. You did not determine the trend of the tendon force for a group of tendons through a regression analysis based on individual tendon lift-off forces for a group of tendons for each surveillance. The trend of the average tendon force for the group can be obtained only statistically through a regression analysis of the normalized individual tendon lift-off forces from each of the surveillances so far performed. Unless lift-off measurements were obtained for all of the tendons in a group, the average of the few lift-offs would not accurately reflect the average for the entire grou). especially for the determination of the trend of the group tendon force. T1is is the reason why we have reservations about the gra)hs shown on data sheet nos. 22, 23 and 24 in your report, which are obtained )y simply joining the data points, each representing the average force of each of the surveillances. Therefore, we request that a regression analysis be performed for the lift-off forces for each group as indicated above. Also provide all the lift-off force data so that an independent analysis can be performed.