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Management of Commercially Generated Radioactive Waste - U.S. ...

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2Z<br />

Page 3.5.21, par. 5: Another disadvantage should be mentioned. Islands are<br />

<strong>of</strong>ten more associated with resources and more subject to faulting, seismicity,<br />

volcanism, erosion, effects <strong>of</strong> sea-level changes, extreme storms, and tsunamis<br />

resulting from reverse well Injection should be further examined in the<br />

course <strong>of</strong> testing suitable monitoring methods that would not penetrate<br />

the individual waste sheets.<br />

than mainland areas.<br />

Page 3.6.6, table 3.6.2: The sorption coefficients listed are credible<br />

although they could.easilybe 1 or 2 orders <strong>of</strong> magnitude in error. Their<br />

Page 3.8.24, sec. 3.8.3.1: Has reverse well injection in salt beds been<br />

considered? Salt is not mentioned among media under consideration. It<br />

has been found to be amenabe to bedding plane fracture.<br />

soirce should be properly explained and cited. They should not be used for<br />

transport-time calculation.<br />

Page 3.6.14, par. 1, last sentence: This statement requires documenting<br />

evidence or a reference.<br />

Section 3: It would be useful to provide concisesuaries <strong>of</strong> advantages<br />

and disadvantages for the three subsections now lacking them: chemical<br />

resynthesis (sec. 3.2), very e r y deep e e p hhole o e concept c o n c e p t ( (sec. s ec 33.3), 3 ) aand n sspace p a ce<br />

disposal (sec. 3.10).<br />

Page 3.6.18, last par.: Appropriate references on these sorption coeffieicnts Section 4: See our comnents for pages 1.31-1.35<br />

need to be cited here. Page 4.2, par. 2: We believe,that all the ratings used in this system<br />

Page 3.6.19, line 1: This statement appears in error; 54Mn shows more than require some degree <strong>of</strong> value judgment.<br />

a factor <strong>of</strong> 10 spread. Page 4.25, par. 3: We believe that greater clarity could be achieved in<br />

expressing the several ideas included in the following sentence: "Further<br />

Page 3.6.19, fg. 3.6.8: These sorption coefficients mean very little unless effort to improve knowledge <strong>of</strong> the performance <strong>of</strong> each CWM option with<br />

their exact measurement conditions (chemical and physical) are described, respect to the decision attributes and their parent criteria will also<br />

This would include as a minimum: ionic strength and composition <strong>of</strong> the solu- aid the decision makers in establishing important weighting factors needed<br />

tion, initial exchange conditions <strong>of</strong> the clay, pH and Eh <strong>of</strong> the solution, to combine the attribute assessments into a composite figure <strong>of</strong> merit for<br />

surface area <strong>of</strong> the clay, sorption equilibrium time, and solid-to-liquid each CWM option, for it has been demonstrated that the importance attached<br />

ratio. to an attribute or criterion depends not only upon the intrinsic nature <strong>of</strong><br />

the criterion but also upon the expected performance <strong>of</strong> the decision 0<br />

Page 3.6.19, last par., lines 4-5: Although organic complexes might be insignif- alternatives with respect to that criterion."<br />

icant, there is a chance that carbonate (or other inorganic) complexing might<br />

be significant. This should be pointed out. Page 4.25, lastpar., last line: Add a sentence: "This does not imply,<br />

however, that conventional geologic disposal is environmentally the best<br />

Page 3.6.29, par. 5-6: Measurements <strong>of</strong> molecular diffusion coefficients will option available. g d i e t<br />

be needed for near--and far-field transport analysis.<br />

Section 6, Glossary: Many important key terms are missing that should be<br />

Page 3.7.10: Disposal <strong>of</strong> wastes in an ice sheet would probably entail loss included, such as: intermediate-level waste, permeability, hydraulic<br />

<strong>of</strong> control <strong>of</strong> spacing <strong>of</strong> waste containers. Flow velocities and perhaps even conductivity, Kd, sorption coefficient, distribution coefficient, beta<br />

flow directions might change over long periods. Possible impacts should be activity, porosity, hydraulic head.<br />

evaluated.<br />

Page 3.7.10, par. 4: This statement should mention that there is one more<br />

handling and transportation step in ice disposal than in seabed disposal-from<br />

the unloading dock to the ice disposal site.<br />

Page 3.7.10, sec. 3.7.1.6, first item: This statement is debatable; the fact<br />

that these remote areas are relatively unexplored for resources might attract<br />

considerable exploration in the future as some <strong>of</strong> the last frontiers for<br />

new discoveries.<br />

Page 3.8.11, Canditate Geologic Environments: Effects <strong>of</strong> local stresses and<br />

conditions--such as varying topographic load and joint patterns--on uplift<br />

22

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