ML20080S998
| ML20080S998 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/01/1983 |
| From: | BROOKHAVEN NATIONAL LABORATORY |
| To: | |
| Shared Package | |
| ML20080S984 | List: |
| References | |
| FOIA-83-483 NUDOCS 8310180619 | |
| Download: ML20080S998 (3) | |
Text
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o SUMiiARY AND EVALUATION REPORT Report
Title:
Diablo Canyon Unit I Independent Design Verification Program Independent Design Verification Program - Soils - Intake Structure
-1 Report No. ITR-13, Revision 0 Report Date:
12/6/82 Aut hor:
Robert L. Cloud Associates Edward Denison Project Manager 8310180619 830901 PDR FOIA i
CALSOYA83-483 PDR
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INTRODUCTION ITR-13 describes IDVP's review of the soil conditions for the Intake Structure of the Diablo Canyon Nuclear Plant.
The'IDVP review is concentrated on the verification of the bedrock depth and the properties of the backfill.
Some camparisons between results previously given by Harding Lawson Associates are reported.
As a consequence of this study, IDVP has issued E01 1094.
This is a review of ITR-13.
The review is based upon naterial contained in the report itself.
Discussions were not held with IDVP staff nor were any of-the data contained in the references of ITR-13 verified.
SUMMARY
OF REPORT According to ITR-13, Robert L. Cloud and Associates Inc. (RCLA), and Dr.
Robert McNeill reviewed the soil work performed by Harding Lawson Associates (H LA ).
This review includes work carried out in detennini'.9 the bedrock depth and the backfill material definition for the Intake Structure of the Diablo Canyon Plant.
ITR-13 describes the results from the IDVP's review of these two items.
According to IDVP the bedrock depth was verified by comparing inforration fran field data, available reports by HLA and PG&E's topographical drawings.
These comparisons indicate that the data for the bedrock depth agree in general. The exception being locations of some borings which were found to be
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inconsistent.
According to the IDVP, this is due to a typographical error.
This issue is addressed in E01 1094.
The values for the bedrock depth obtained from HLA boring logs, HLA seismic refraction surveys, and the final excavations at the site, differ within limits that are deemed acceptable by IDVP.
According to the ITR-13 the results from six lab tests performed by HLA were reviewed by the IDVP for the backfill material property definition.
HLA results from lab tests were compared with IDVP independently calculated val-ues.
Agreenent between HLA test values and IDVP values for the backfill prop-erty' was found on the basis of the 15% acceptance criterion.
Cyclic triaxial
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- test evaluation was not made due to lack of sufficient information.
Further-more, a comparison between HLA boring logs and lab' test values from five
. boring holes was also made.
Consistent information was found.
A classifica-tion of the backfill material based on the. plasticity chart was also made.
Finally HLA's values for the compressive strength of the~ material were compared with data available in the literature.
This was mostly done for overall. trend purposes which were found to b'e satisfactory.
.The conclusion made in ITR-13 is that the soils work performed by HLA for the determination of the bedrock depth and the backfill material property definition was found acceptable for the Intake Structure of the plant.
l EVALUATI5N The review conducted by RLCA seems reasonable and can be expected to identify possible discrepancies for the bedrock depth determination and the backfill material property definition for the Intake Structure. The review, however, is mostly based on field and; laboratory test data provided exclusively by one company, namely HLA.
Clearly for an independent review a cross-check using data from other sources would be desirable.
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