ML20204F129

Forwards Evaluation of Containment Liner Plate Leak Chase Channel Sys for Point Beach Nuclear Plant Units 1 & 2 & Parts 1-3 of Test Rept on Static Load Tests on Liner Plate Leak Chase Channel Assemblies

ML20204F129
Person / Time
Site:	Point Beach
Issue date:	07/24/1986
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	Harold Denton, Lear G Office of Nuclear Reactor Regulation
Shared Package
ML20204F134	List: ML20204F129 ML20204F154 ML20204F167
References
CON-NRC-86-338 VPNPD-86-318, NUDOCS 8608040102
Download: ML20204F129 (2)

Text

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Wisconsin Electnc eowra coursur 231 W. MICHIGAN. P.O. BOX 2046, MILWAUKEE, WI 53201 VPNPD-86-318 NRC-86-338 July 24, 1986 Mr. H. R. Denton, Director Office of Nuclear Reactor Regulation U. S. NUCLEAR REGULATORY COMMISSION Washington, D. C. 20555 Attention: Mr. G. Lear, Project Director PWR Project Directorate 1 Gentlemen:

DOCKETS 50-266 AND 50-301 CONTAINMENT INTEGRATED LEAKAGE RATE TESTING POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 Wisconsin Electric Power Company, licensee for the Point Beach Nuclear Plant, sent a letter to the Nuclear Regulatory Commission on February 12, 1985, which stated our intention to perform the necessary design reviews, evaluations, and tests of the containment liner plate weld leak chase channel system to qualify the Point Beach leak chase channel system as an integral part of the containment liner plate. The qualification of the leak tight integrity of the leak chase channels was conducted in order to validate our Containment Integrated Leakage Rate Testing program, which does not require venting the leak chase channels, as meeting the requirements of 10 CFR Part 50, Appendix J.

The program of evaluations, analyses, and tests which were performed by Bechtel Corporation and the University of Michigan included the following:

a. A survey of performance history for liner plates and leak chase channels with respect to development of inservice leaks in other plants.

b. Evaluation of construction records for the Point Beach liner plate system with respect to material verification and quality control.

c. Structural analyses of typical containment liner plate sections to evaluate the severity of loading on leak chase channels.

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Mr. H. R. Denton July 24, 1986 Page 2

d. Executing a test program to define the load-displacement characteristics of leak chase channels while interacting with the liner plate and containment concrete to verify the leak tight integrity of the leak chase channels while subjected to extreme load and displacement conditions.

To summarize the results of the program, the analyses show that the stress and displacement levels of the leak chase channels associated with the most severe postulated loading conditions on the liner plate system are well within acceptable limits which i have been verified experimentally. Additionally, the analyses and testing, along with the favorable performance history for Point Beach and similar liner plate systems, and documented quality assurance during construction indicate that the leak chase channel system can reliably function as an integral part of the containment structure liner plate pressure boundary.

Based on the results of the program to qualify the Point Beach containment leak chase channel system, we conclude that the leak chase channel system can be considered an integral part of the containment liner plate. Venting of our leak chase channels is, therefore, not necessary to perform a containment integrated leakage rate test which meets the requirement of 10 CFR, Part 50, Appendix J.

A copy of the report of the evaluation is enclosed for your review. If you have any questions regarding the evaluation or the conclusions, please contact us.

Very truly yours, kdc C. W. Fay Vice president Nuclear Power Attachment Copy to Resident Inspector (without attachment) m L _