ML20138G884
| ML20138G884 | |
| Person / Time | |
|---|---|
| Issue date: | 09/23/1985 |
| From: | Johnson T NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Gillen D NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| REF-WM-41 NUDOCS 8510280072 | |
| Download: ML20138G884 (2) | |
Text
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.. -. _. _.& ' n e i,?.1. M M iGT r/f TJohnson & r/f MEMORANDUM FOR:
Dan Gillen MFliegel Low-Level Waste and Uranium MKnapp Recovery Projects Branch DMartin Division of Waste Management LBHigginbotham RJStarmer FROM:
T. L. Johnson J0 Bunting Hydrology Section MJBell Geotechnical Branch REBrowning Division of Waste Management
SUBJECT:
REVIEW 0F CONSTRUCTION SPECIFICATIONS CHANGE FOR CLIVE EROSION PROTECTION In accordance with your recent verbal request, we have reviewed the proposed changes to the construction specifications for the riprap that will be placed at the Clive, Utah remedial action site.
00E is requesting, among other minor changes, a change in the specifications for absorption of the proposal rock from a maximum of 1% to a maximum of 2%.
The following changes to specifications established during the RAP review were proposed:
Test RAP Spec New Spec Absorption 1%
< 2%
> 2.60
> 2.60 L.A. Abrasion
< 40%
< 25%
Na 50 Loss
< 10%
< 8%
2 4
At NRC staff request, the State of Utah provided the results of gradation tests which were performed on the proposed rock.
Based on our review of this gradation information, the minimum D rock size is approximately 8 inches; 50 original specifications called for an average 0 size of approximately 4 1/2 50 inches, with a layer thickness of 18 inches.
Our review of the proposed new specifications indicates that the rock will meet the standards of at least fair quality rock (as established by the U.S. Bureau of Reclamation), with the exception of the absorption test.
However, in a letter to DOE dated February 13, 1985, the Utah Department of Transportation indicates that there are particles of calcium carbonate intermixed with the rock, which would probably cause the rock to absorb more moisture.
egara ""1 0FC :WMGT kd :WMGT h_41 NAME :TLJohnson
- MFliegel DATE :85/09/19
- 85/09/
S;? 3 3 1965 TJ/85/09/10 It can also be seen that the new specifications for L.A. abrasion and sodium sulfate loss are more stringent than the original specifications.
Conclusions Based on our review of the proposed riprap material, we conclude that the proposed changes in contract specifications are acceptable, because (1) the average rock size is approximately twice as large as needed, (2) the other durability specifications approved in the RAP review are either equalled or exceeded, and (3) there is calcium carbonate present which is probably influencing the absorption test results. We consider that the proposed rock, with the increased D size, is preferable to the rock originally proposed.
50 Recommendations l
l The change in rock size may necessitate a change in the filter layer underlying l
the riprap.
This should be reviewed by the Engineering Branch (WMEG).
Originql Signed By T. L. Johnson Hydrology Section Geotechnical Branch Division of Waste Management 0FC :WMGT kd :WMGT
..........)
NAME :T oin o
- MFliegel DATE :85/09/00
- 85/09/ %