ML19242D745
| ML19242D745 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 07/10/1979 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Reinmuth G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML19242D746 | List: |
| References | |
| NUDOCS 7908170483 | |
| Download: ML19242D745 (7) | |
Text
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UNITED STATES o
NUCLEAR REGULATORY COMMISSION
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JUL 10 1979 Docket tio. STN 50-4S2 MEMORAfiDUM FOR:
G. W. Reinmuth, Assistant Director, Division of Reactor Construction Inspection, Office of Inspection and Enfcrcement FROM:
S. A. Varca, Acting Assistar.t Director for Light Water Reactors, Division of Project Management, Office of liuclear Reactor Regulation
SUBJECT:
EVALUATION OF REACTOR BUILDING BASE MAT - WOLF CREEK fiU: LEAR GENEPATIfiG STATION On January 3,1979, lead responsibility for the review and acceptance of the concrete strength of the Wolf Creek reactor building base mat was transferred to DPM. The issue concerned the fact that, at the end of a 90-day curing period, 34 out of 66 sets of concrete test cylinders exhibited strengths below the specified value of 5000 pounds per square inch.
On January 4,1979, a reeting was held in Bethesda, Maryland with repre-sentatives of the Wolf Creek applicant, IE, and NPR to discuss the issue.
IE' had performed an investigation of the natter and documented its findings in a report, dated February 16, 1979.
The results of the applicant's investigatiens into the matter were submitted in a report, dated October 26, 1978.
Subsequent to the January 4,1979 meeting, the applicant perfor ed additional tests for the concrete and submitted the results of the tests by letters, dated February 28, 1979 and May 3,1979.
At our request, the applicant also sub nitted the results of a reanalysis of the base mat, by letters dated May 10,1979 and June 6,1979, to demonstrate that with the strength of concrete indicated by the 90-day cylinder tests, the base mat satisfies the cesign connitments cade in the Wolf Creek PSAR.
At the request of IE, the Structures Laboratory of the Corps of Engineers, USAE Waterways Experiment Station, Vicksburg, Mississippi, conducted a petrographic examination of concrete thin sections and docunented its conclusions in a report, dated July 2,1979.
7908170y33 I
G. W. Reinmuth JUL 101979 The Structural Engineering Branch has completed the review of all the above documents and its evaluation of this matter is presented in the enclosed report. The report concludes that, based on the review of the test results and the results of the reanalysis, the base mat concrete strength has not retrogressed, the strength of the base mat meets the original design criteria in the Wolf Creek PSAR, and the nat will withstand the specified design loads and loading combinations without impairment of structural integrity or safety function.
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SteveA.V(crga,n Sn,.,As_'stant Director for Light Ka>er Reactors Division of Project Management
Enclosure:
As Stated cc w/ enclosure:
K. Seyfrit, IE, IV R. Shewmaker F.
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