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

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7.29<br />

TABLE 7.3.10. Number <strong>of</strong> 800-hectare(a) Repositories Required<br />

Case Nuclear Power Growth Assumption Once-Through Cycle Reprocessing Cycle<br />

1 Present Inventory Only 0.03 to 0.1 NA<br />

2 Present Capacity and Normal Life 0.2 to 0.7 NA<br />

3 250 GWe System by Year 2000 and<br />

Normal Life 1 to 4 2 to 5<br />

4 250 GWe System by Year 2000 and<br />

Steady State 2 to 5 3 to 6<br />

5 500 GWe System by Year 2000 2 to 7 4 to 9<br />

(a) 800 hectares = 2000 acres.<br />

(b) NA = not applicable.<br />

7.3.6 Equilibrium Requirements for Equilibrium Steady-State Systems<br />

One <strong>of</strong> the purposes for Case 4 was to illustrate the level <strong>of</strong> continuing requirements<br />

in a steady-state nuclear system--in this case, 250 GWe. Table 7.3.11 shows these equilib-<br />

rium requirements in terms <strong>of</strong> spent fuel disposal or reprocessing requirements, annual waste<br />

shipments and the number <strong>of</strong> years to fill an 800-hectare repository in the four geologic<br />

media. Requirements for other sizes <strong>of</strong> steady-state systems will be directly proportional<br />

to these requirements. For example, a 500 GWe steady-state system would have twice the<br />

requirements shown in Table 7.3.11. Data are provided on the number <strong>of</strong> years to fill repos-<br />

itories for waste ages <strong>of</strong> 5 and 50 years to lend perspective on the age variable. A signif-<br />

icant improvement for the 50-year-old waste is indicated in all media for the reprocessing<br />

wastes and for spent fuel in granite or basalt, but relatively small improvements are shown<br />

for spent fuel in salt and shale.<br />

TABLE 7.3.11. Equilibrium Requirements for Case 4 (250 GWe Steady State)<br />

One-Through Cycle<br />

Spent Fuel to<br />

Disposal or Annual <strong>Waste</strong> Time Required to Fill an 800-hectare Repository<br />

Reprocessing, Shipmentsta) 5-yr-old 50-yr-old 5-yr-old 50-yr-old<br />

MTHM Truck -Rail . Spent Fuel Spent Fuel HLW HLW<br />

Spent Fuel 6000 1400 1400<br />

Salt<br />

10<br />

11<br />

Granite 24 32<br />

Shale 12 15<br />

Basalt 24 32<br />

Reprocessing Cycle<br />

Spent Fuel 6000 1400 1400<br />

HLW and<br />

Other <strong>Waste</strong>s<br />

Salt<br />

Granite<br />

Shale<br />

Basalt<br />

3400 810<br />

(a) A shipment is defined as one rail car or one truck load.<br />

11 21<br />

11 23<br />

6 !1<br />

11 20

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