ML19208D548
| ML19208D548 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 09/04/1979 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Matthew B AFFILIATION NOT ASSIGNED |
| Shared Package | |
| ML19208D546 | List: |
| References | |
| NUDOCS 7909280589 | |
| Download: ML19208D548 (2) | |
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c;p 4 gg7g Docket File 482 NRC PDR Local PDR NRR Reading LWR #3 File HDenton ECase Occket No: STN 50-482 WRussell DVassallo SVarga OParr
- 's. Beth Matthew ELicitra 2355 Forestview Drive MRushbrook
'!ichita, Kansas 67223 MGroff (NRR-2990) v 4""Y EHughes EMoore Cear Ms. Matthew:
Your mailgram of June 27, 1979, to Mr. Harold Denton, concerning the concrete in the base cat at Wolf Creek, has been referred to me for a re:ly.
In your mailgrar, you state that further analysis of the test data from concrete at '.olf, Creek is needed since the concrete is "cetting weaker over a 90-day period". You also incicate that the concrete is sub-standard.
Lith regard to your statement about the base cat concrete getting weaker, we believe you are referring to the fact that for sore of the 90-day tests performed on the concrete, the results indicated lower strengths than these obtained with the 23-day tests.
In order to determine if the concrete was becoming weaker with time, the Unsas Gas & Electric Company (the lead applicant for the Wolf Creek plant) had nur6er of strength tests and petrographic analyses performed on the concrete sa nples originally tested at 20 days and 90 days. The applicant concluded that the re.sults of these tests and analyses indicated no signs of inadequate mix-ing-or adverse chemical reaction, or that the concrete was getting weaker with tire.
At our request, an independent petrographic analysis was also perforred on the concrete samples by the U.S. Army Corps of Engineers. The results of thE analysis performed by the Corps of Engineers agreed with the applicant's results.
Additionally, the applicant performed a reanalysis of the base cat, at our request, to cetermine if the indicated strength of the concrete based on the 90-day test re-sults would satisfy the design criteria specified in the Wolf Creek Preliminary Safety Analysis f.eport (PSAR).
The applicant calculated this strength to be 4,450
- ouncs per square inch as compared to the 5,000 pounds per square inch value which was originally specified by the architect-engineer to r.cet the design criteria in the t'olf Creek PSAR. The applicant then performed a reanalysis of the base mat based on a contrate strenrth of 4,460 peur.ds ~per squ3re inch to demonstrate that the design criteria in the PS?" were net.
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v i'e have performed an evaluation of the Wolf Creek base mat, including the tests and analyses discussed above. The results of our evaluction were issued in a i
docu:ent, dated July 12, 1979. A copy of this document is enclosed for your information.
As stated in the document, we conclude that the base nat ccncretc strength has not retrogressed, that the strencth of the base cat meets the
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criginal design criteria in the Wolf Creek PSAR, and that the nat will withstand the specified design loads and loading ccabinations without impairment of its structural integrity or its safety function.
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! ar.. pleased to have had this cpportunity to respond tt he comments in vcur ma11 gram.
lL' Sincerely, i
Steven ;.. Vargc, Actin;.'ssistant ~,irecter l
for Ligh
'.'ater F.cac crs Division of Project "ar.a ement
Enclosure:
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