ML20196H608

Forwards Request for Addl Info Re Util 870818 Response to NRC Request for Info Concerning Containment Structural Integrity Surveillance Requirement Tech Spec Changes

ML20196H608
Person / Time
Site:	Summer
Issue date:	03/04/1988
From:	Hayes J Office of Nuclear Reactor Regulation
To:	Nauman D SOUTH CAROLINA ELECTRIC & GAS CO.
References
TAC-62801, NUDOCS 8803110158
Download: ML20196H608 (4)

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mum Docket No. 50-395 DISTRIBUTION aNRC"& 6 LocalS:

PDRs JPartlow ACRS(10)

Mr. D. A. Nauman PD21 R/F Vice President, Nuclear Operations SVarga South Carolina Electric & Gas Company Glainas Virgil C. Sumer Nuclear Station EAdensam P. O. Box 88 JHayes Jenkinsville, S.C. 29065 PAnderson

-OGC-B

Dear Mr. Nauman:

EJordan

SUBJECT:

CONTAINMENT STRUCTURAL INTEGRITY SURVEILLANCE REQUIREMENT TECHNICAL SPECIFICATION CHANGES - VIRGIL C. SUMMER NUCLEAR STATION (TAC N0.

62801)

We have reviewed the information provided in your letter of August 18, 1987 to J. Hopkins. Your letter was in response tc our June 23, 1987 request for infor-mation. Having completed the review of your submittal, we find that additional information is required. Our request for additional information is contained in the enclosure. We anticipate having a meeting following our review of your submittal.

The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincerely, d  :

John J. Hayes, Jr., Project Manager Project Directorate 11-1 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation cc w/ enclosure:

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

Mr. William A. Williams, Jr.

Technical Assistant - Nuclear Operations Santee Cooper P.O. Box 764 (Mail Code 153)

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

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

Washington, D. C. 20036 Resident Inspector /Sumer NPS c/o U.S. Nuclear Regulatory Comission Route 1 Box 64 Jenkinsville, South Carolina 29065 Regional Administrator, Region II U.S. Nuclear Regulatory Comission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Chainnan, 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 l

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Docket No. 50-395 REQUEST FOR INFORMATION ON VIRGIL SUMMER TENDON SURVEILLANCE

. BY STRUCTURAL AND GEOSCIENCES BRANCH

1. In your calculation of required prestressing forces as given in Filing Code 1.18.2 you use the values.provided in FSAR Section 3.8.1.3.1 as the bases. Indicate how these values were established, specifically all the values given in item 3 on page 3.8-16 and the factors 1.14, 1.18 and 1.16, and where these factors are used in the calculation. Indicate how the force of 10073.8 psf and the factor 1.145 on page 5 of Filing Code 1.18.2, and how the number 11,700 psf and the factor 1.1825 on page 11 were established.

2. It is claimed that the tendon elongation under accident pressure will produce a corresponding increase in tendon force. In the staff's opinion such an increase should not be relied on due to the fact that portions of the tendon near the anchorage may be in the non-linear or plastic range and any increase in the elongation may not increase the tendon force to any appreciable amount. This is especially true for curved tendons such as the hoop and dome tendons. Provide justification for your conclusion j that tendon elongation under accident pressure will produce a corresponding l

increase in tendon force. l

3. From the information provided in identifier 1.18.6 on the non-interaction method and the interaction method, as well as in Reference 2 on page 12

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i of the same identifier, it is understood that the computation of prestress  !

losses and tendon forces is for specific tencon groups. Identify in simple sketches the locations of the tendons shown in Table 1 of the third surveillance - interaction losses (81 s. r. curve) and the 39 vertical tendons, 50 hoop tendons and 33 dome tendons tabulated on page 3 of identifier 1.18.6.

4 The information provided on page 2 of Enclosure 3 does not give any insight into the conditions of the tendon forces in the containment because llo infonnation on lift-off forces is given. For each tendon the lift-off force or forces at detensioning as well as after retensioning should be given. In accordance with technical specification section 4.6.1.6.1, fifteen tendons should undergo lift-off tests. However, from the table on page 2, only 10 tendons in Surveillance No. 1, 5 tendons in Surveillance No. 2 and 3 tendons in Surveillance No. 3 are listed. Provide the infonna-tion on lift-off forces of all tendons as required by technical specifica- l tion.  ;

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