ML19249E874
| ML19249E874 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 09/05/1979 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Eilers R AFFILIATION NOT ASSIGNED |
| Shared Package | |
| ML19249E875 | List: |
| References | |
| NUDOCS 7910020647 | |
| Download: ML19249E874 (2) | |
Text
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f Lectet f.o: STN 50-402 mo D
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I-r. Ecn Eilers
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g 1512 South Perb. cod Lane I D
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Lichita, Kansas 67216 I
Dear Mr. Eilers:
Ycur n.ailgrata cf July 16, 1979, to Mr. tiarold Centen, concerning ti.e concrete in t!.e helf Creek base n.at, has been referred to r.e fcr a reply.
In ycur r..e i l-grain,.you expressed concerns about evaluations perfercec on the concrete anc request further tests by an " unbiased private specialist".
We appreciate your ccncerns and would like to previ6c the follcwing ccr,=ents on this luatter.
The requirements originally utablished for the base raat are the design criteria specified in the Wolf Creek Prelirainary Safety Analysis Report (PSAR). These criteria require that the base mat be designed to withstanc specified design loads and loacing con.binations withcut impaiment of structural integrity or safety functicn.
To satisfy these crit.eria, the architect-engineer for the E.'olf Creek plant hac specified a concrete st ength of 5,000 pounds per square inch along with'other design parameters (e.g.; concrete thickness and rebar cesign). After the ccrw
. crete for the base cat had been placed, strength tests perfurced at the specified 90-day curing period gave results in some ca es which were less than 5,000 pounds per square inch.
As a result of the above situation, the Kansas Gas & Electric Corapany (th'e lead applicant for the ' olf Creek plant) had a number of strength tests and petre-grabhic analyses perforr.ed on the previously tested ccccrete sacples to evelt, ate the situation.
The applicant concit.ded that the rcsults cf these tests and analytr-indicated nu signs of sub-standard cencrete, inace:.t. ate rixir.c cr acverse chacel reaction, or that the ccr. crete tcs Letting t caker with tice.
ii.t our request, an incependent petrciraphic analysis tas alsc perferr.ec cn ti c concrete 5:: qles by the U.S. l.rq Cori,s cf Ene,ircers.
Ti e results of t!.: :nri, si3 perforr.e6 by the Corps cf En9 r.eers asrcec..it!. tt e calicart's results.
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f.r. Ron Eilers !
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Accitionally, the applicant perfcmed a reanalysis'cf the base rat, at cur request, to detemine if the indicatec strength of the ccccrete based en t!c
%-cdy test results s.culd satisfy the desi n criteria s ecified in the icif t
Creek PSAR. The opplicant calculated this stren<?th to ::e 4,40 pcends per squcre inch as co:..pered to the 5,000 pcunds per spere inch valt.c cric irwlly si ecified by tl e arct.itect-engineer. The applicant then ;tricr ed a reanalysis cf the base ::at Laced on 'a concrete strength cf 4,46C ; cur.ds per scuare irich to cefacnstrate that the design criteria in the PSAR here ret.
Our evaluation of the kcif Creek base r.idt, included the tests and analyser discussed above. Based on our evaluaticn, we concluded that the base tr.at ccr-crete st.ength has not retrogressed, that the strength cf the base r at neets ti!e original cesign criteria in the ',Jolf Creek PSAP., anc that tne raat will Lithstand tiie specified cesign 1 cads and Icading cot t'inaticns kithcut ir.4cir-r.ent of its structural integrity or its "afety function.
In suruary, the applicant has der.cnstrated that the trolf Creek base trat does r..eet the original design criteria specified $n the 1:cif Creek FSAR.
Sincerely, Orillaal signed by Olan Parr D
D Steven A. Vcrga, t.cting Assistant L'i rectcr O c>
for Light hiter Reactors Division of Project Managerent y
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