ML20126A242
| ML20126A242 | |
| 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 | |
| ML20126A095 | List: |
| References | |
| NUDOCS 8002140512 | |
| Download: ML20126A242 (2) | |
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_ y g^%(9. e JCLEAR REGULATORY COMfMSSiaN Appendix E e.
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Ncket lp. STS 50-452 MEMR'.fiDLM FDR:
G. W. Reir:auth, Assistant Director, Division of Reactor Construction Inspection, Office of Inspection and Enforcecent FF.0M:
- 5. A. Yarga, Acting Assista'nt Director for Light Water Reactors, Division of Project Management, Office of Huclear Reactor Reculation
SUBJECT:
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- 5.. 'I Oh., 'ALUATION OF RF_ ACTOR 5JILDING BASE MAT - WOLF C D
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On January 3, ii79, lead responsibility for the review and acceptance of the :enerate strength cf the Wolf Creek reactor building base mat was ar.sferred to 0?M.
The issue concerned the fact that, at the end of a
?;-day cc-ing period, 34 oct of 65 sets of concrete test cyiinders exhibited s ren;ths below the spe:ified value of 5000 pounds per square inch.
On Janutr/ 4, 1979, a testing was held in Bethesda, Maryland with repre-sentatives :f the W:lf Creek applicant, IE, and NRR to discuss the issue.
IE~ had pt-f: red an investigation of the matter and doctraented its findings i,. a e.::.-t, dated February 16, 1979 The results of the appiitant's inves';ict:irr.s ir.tc the matter were submitted in a report, dated October 26, 1:/ c Subse:uen
- the January 4,1979 meeting, the applicant performed additional tests for the c:ncrete and sub itted the results of the tests by letters, dated Fel-vary 2E,1975 and Kay 3,1979.
At our recuest, the applicant also s6:itted t.he results of a reanalysis of the-base mat, by letters dated '-
Ma v 10, 1979 and J:ne 5,1979, to demnstrate that with the strength of
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ccnerate indicated by the 90-day cylinder tests, the base mat satisfies the design :.. it7ents r.ade in the Wolf Creek PSAR.
At the recuest of IE, the.
Stru:tt: es '_aboratory of the Corps cf Engineers, USAE Waterways Experiment S:atier,, Vicksburg, Mississippi, condu:ted a petrographic examination of
- ncrete thin se:tions and docunented its conclusions in a report, dated July 2,1979.
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2-JUL 10 ;;79
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- .e.e: rue: ural tr.;;neering 3srancn nas comp,ie:ec the review or all the asove s
d::'erents and its evaluation of this matter is presented in the enclosed rep rt..
The rep rt cor.:ludes that, based on the review of th'e test results ar.d the results cf the reanalysis, the base mat concrete strength has not retre;ressed, the strer.;th of the ' ase mat mes:s the original design o
criteria in the Koif Creek PSAR, and the mat will withstand the specified essica icads and leading cc.binations witnou: - mpairment of structural ir.tecri:v er safety fur.: tion.
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' Steve A. Verga, Act
. Dire: tor for Light Mer Reactors Division oT rroject N,anagement
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