ML20205F055
| ML20205F055 | |
| Person / Time | |
|---|---|
| Issue date: | 03/13/1987 |
| From: | Justus P NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Martin D NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| REF-WM-68 NUDOCS 8703310075 | |
| Download: ML20205F055 (4) | |
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WM68 AI/87/03/11 87078 DUP g 3 37 MEMORANDUM FOR: Dan Martin, Section Leader Uranium Recovery Pro.iects Section Low-Level Waste and Uranium Recovery Pro,iects Branch FROM: Philip S. Justus, Acting Chief Geotechnical Branch
SUBJECT:
REVIEW 0F THE DRAFT RAP FOR GREEN RIVER, UTAH Attached please find the comments on the Draft RAP for Green River, Utah.
These comments are based on the seismic information provided by the applicant. !
If you need further information, contact A. Ibrahim at X74211.
d Philip . Justus, Acting Chief Geotechnical Branch
Attachment:
As stated i
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WM68 AI/87/03/11 87078 DUP 2
COMMENTS ON GREEN RIVER RAP General The RAP does not discuss any geophysical survey which may have been used to support the site investigation findings such as identification of unexposed faults. Discuss the type of geophysical surveys conducted. If no surveys were conducted explain the reasons.
Section 3.3.3, P. 75, Seismicity and Tectonics
- 1. It is stated that " salt anticlinal collapse features extend to within about 12 miles of the site. These features have been active during Quaternary and may be active today. At the site the potential for subsidence due to salt solution were not totally conclusive."
Provide the analyses that show that the performance of the site within its 1000 year lifetime will not be affected by subsidence due to salt dissolution.
Section 3.3.5, P. 28, Potential Impact of Future Natural Resources Development
- 2. It is stated that " stratigraphic units that underlie the site area are known to contain economic deposits of uranium and vanadium ores, oil and gas, gypsum, salt, potash and brines in other areas. Units that may contain these cres such as Morrison Formation are present beneath the site but there is no known evidence of development potential."
At present, there is no active exploration for the ore deposits under the site because of the depth of burial of the Morrison Formation and other potential ore hearing units. What action has been taken to prevent any future potential development during the lifetime of the site if these cres become economically viable?
Section D-3.4, P. 0-54, Differential Movements in the Site Area
- 3. It is stated that "all faults in the site area were carefully examined for evidence of Late Pleistocene or Holocene movements, but the results were inconclusive."
Fault movements in the late Pleistocene to Holocene tine delineated by low sun angle aerial reconnaissance or any other means should be investigated thoroughly and addressed more fully and supporting evidence should be provided.
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WM68 AI/87/03/11 87078 DUP Section D-3.4, P. D-55, Existing Tailing Pile
- 4. Provide supporting evidences that a fault does not exist between boreholes 577 and 701 in figure D.3.8.
Section D-3.5, P. D-59, Mineral and Other Resources
- 5. What is the source (origin) of the CO,3 gas entrapped in the Navajo Sandstone? Identify whether it is volcanic or organic and discuss how far the source is from the site.
Section D-3.7.5, P. D-69, Analysis of Seismic Risk
- 6. The Campbell's (1981) attenuation rela *:ionship is based mostly on earthquake data from California. Provide the rationale for using this relationship for Green River versus other recognized relationships as mentioned in the NRC Standard Review P?an, or other recently developed relationships.
Section D-3.7.5, P. D-73, Determination of F E Magnitude
- 7. Graphical determination of ME magnitude in Figure D-3-14 of the DRAP for the Colorado Plateau interior indicates a range of 6.? to 6.8 Kirkham and Rogers (1981) recommended a 6.5 macnitude for the Colorado Plateau Interior. The DRAP report states that FE magnitude must fall somewhere within the range 5.8 to 6.5. The DRAP report states that faults surrounding the site, if capable, woule produce earthquake magnitude up to 7.3.
Based on the above statements, the recotmended 6 ? magnitude for the maximum earthouake falls in the low rar.ge of the suggested values.
Provide more supporting evidences for the choice of 6.? as the maximum magnitude.
Section D-3.7.5, P. D-77 Fault and Epicente a Compilation
- 8. Plate F-4.1 in the DRAP report shows a nueber of earthouakes plotted within 65 km of the site. Other reports en the area such as the University of Utah catalogue and ONWi-?90,198? (Figure 6.?) have many more earthquakes.
Update Plate E-4-1 and the earthquake tables in the DRAP using the Unversity of Utah catalogue which contains earthquake information up to October 1986
WM68 AI/87/03/11 87078 DUP Identify the source of each earthquake within 25 km of the site if possible.
Provide the supporting evidences which led to identifying fault groups 1, 2, 3, 4, 5, 6, 11, 13, 15 and 16 as not caoable.
What evidence was used to terminate fault 5 about Skm south of the site?
Section D.3.7.5, P. D-85, Potential Licuefaction Hazard
- 9. Provide the rationale that the proposed acceleration of 0.21 g will not be amplified due to the presence of the thin surfacial layer above the bed rock.