ML19208D545

Responds to to H Denton Re Concrete in Base Mat at Reactor Site.Based on Evaluation of Base Mat Including Tests & Analyses by Applicant & Corps of Engineers,Base Mat Concrete Has Not Retrogressed & Original Criteria Satisfied

ML19208D545
Person / Time
Site:	Wolf Creek
Issue date:	09/04/1979
From:	Varga S Office of Nuclear Reactor Regulation
To:	Glamann D AFFILIATION NOT ASSIGNED
Shared Package
ML19208D546	List: ML19208D545 ML19208D548 ML19208D552
References
NUDOCS 7909280584
Download: ML19208D545 (2)

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DISTRIE'JTION W/0 ENCLOSURE:

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' Docket File 50-482

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NRC PDR Local PDR NRR Readug LWR #3 File LWR #3 'Y. T. File Cocket ho: STN 50-482 HDenton j

ECase Je 3 ![L WRussell DVassallo P'l fS l % kiI Mr. Daryl G1amann SVarga g ((Uj j ij[lL 130 horth Bebe Street OParr ELicitra Wichita, Kansas 67212

- MRushbrook (cpy. of inc.)

SE MGroff(NRR-2990)Mc.)

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Dear Mr. Glamann:

EMoore Your letter of June 27, 1979, to Mr. mold Denton, concerning the concrete in the base mat at Wolf Creek, has been referred to me for a reply.

In your letter, you make corrients.about the quality and strength of the concrete.

The matter of the concrete strength of the kolf Creek base mat dealt with the fact that the results of tests perfomed on the concrete at 90 days indicated that some of the concrete batches had strengths of less than the 5,000 pounds per square inch value specified by the architect-engineer to meet the design criteria in the Wolf Creek Preliminary Safety Analysis Report (PSAR).

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cases, the.results of the 90-day tests were lower than the results of the 28-day tests.

As a result of the above situation, the Kansas Gas & Electric Company (the lead applicant for the Wolf Creek plant) had a ntsnber of strength tests and petro-graphic analyses performed on the concrete samples originally tested at 28 days and 90 days to detemine the cause of the situation and to determine if the con-crete was becoming weaker with time. The applicant concluded that the results of these tests and analyses indicated no signs of sub-standard concrete, inade-i

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quate mixing _or adverse chemical reaction, or that the concrete was setting..

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At our request, an independent petrographic analysis was also perfomed on the concrete sanples by the U.S. Amy Corps of Engineers. The results of the~

analysis perfomed by-the Corps of Engineers agreed with the applicant's results.

Additionally, the applicant perfomed a reanalysis of the base mat, at our request, to determine if the indicated strength of the concrete based on the 90-cay test results would satisfy the design criteria specified in the holf Creek PS AP..

The applicant calculated this strength te be 4,460 pounds per square inch as cmpared to the 5,000 pounds per square inch value originially specified by the architect-engineer. The applicant then perfomed a reanalysis of the base ret casec cn a concrete strer:gth cf 4,400 punds per scuare inch to de..cnstrate

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he have perfomed an e' valuation of the Wolf Creek base mat, including the tests and analyses discussed above. The results of our evaluation were issuec in a doctraent, dated. July 12, 1979. A copy of this document is enclosed for your infomation. As stated in the document, we conclude that the base mat concrete i

strength has not retrogressed, that the strength of the base mat meets the criginal design criteria in the Wolf Creek FSAR, and that the mat will withstarPd the specified design loads and Icading combinations without impaiment of its structural integrity or its safety function.

I am pleased to have had this opportunity to resparc to your coranents.

Si ncerely, Steven A. Varga, Acting Assistant Director for Light Water Reactors Division of Prcject F.anagement

Enclosure:

As stated j

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