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

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7.8<br />

WASTE * ANNUAL PRIMARY WASTE QUANITIES<br />

PRODUCTION AND COMPOSITION<br />

* PREPROCESSING WASTE<br />

STORAGE INVENTORY<br />

STREATMNT<br />

TREATMENT * ANNUAL AND CUMULATIVE QUANTITIES OF WASTE<br />

PACKING AND RADIOACTIVITY PROCESSED<br />

PACKAGING<br />

* TREATED AND PACKAGED WASTE<br />

STRAGE INVENTORY AND RADIOACTIVITY<br />

* ANNUAL AND CUMULATIVE<br />

SHIPMENTS SHIPMENTS<br />

* WASTE QUANTITIES AND RADIOACTIVITY<br />

FINAL INVENTORY ACCUMULATION AND<br />

REPOSITORY PERIODIC RADIOACTIVITY INVENTORY<br />

FOR 10 6 YEARS<br />

FIGURE 7.2.2. WASTRAC Calculations<br />

The output <strong>of</strong> WASTRAC provides the waste volume and the quantity <strong>of</strong> each isotope in<br />

each waste stream at each step in the waste management system. Each treated waste stream<br />

is classified by container type and by the surface dose class for the treated TRU waste con-<br />

tainers. Specifically waste streams are classified as high-level waste, remotely handled TRU<br />

(RH-TRU) waste (container surface-dose-rate equal or greater than 200 mrem/hr) or contact-<br />

handled TRU (CH-TRU) waste (container surface-dose-rate less than 200 mrem/hr).<br />

The final step in the system simulation uses the time-dependent waste logistics data<br />

from WASTRAC to calculate the waste management impact and costs and to compile results in a<br />

series <strong>of</strong> tables. The computer code IMPACT was developed to perform these functions.<br />

By utilizing release fractions for each isotope and each waste stream at each waste<br />

management step and dose factors per curie released, the isotopic releases and 70-year pop-<br />

ulation radiation doses for each waste stream at each waste management step are calculated.<br />

Regional dose to whole body, bone, lungs, and thyroid and worldwide dose for release <strong>of</strong> 3 H,<br />

14C, and 8 5 Kr are calculated.<br />

The IMPACT program organizes the results <strong>of</strong> the WASTRAC calculations, sums up annual<br />

and cumulative totals at specified intervals and prepares a series <strong>of</strong> tables to display the<br />

results. IMPACT also calculates both undiscounted and present-worth(a) costs as well as<br />

levelized(b) waste management costs per unit <strong>of</strong> power produced and per unit <strong>of</strong> fuel used.<br />

(a) Present-worth discounting is a method <strong>of</strong> allowing for the time value <strong>of</strong> money. The present<br />

worth may be thought <strong>of</strong> as a present sum <strong>of</strong> money equivalent to a specified future<br />

payment or receipt or to a series <strong>of</strong> future payments or receipts. The present worth <strong>of</strong><br />

a payment is obtained by multiplying the payment by 1/(1 + i) n , where i equals the<br />

interest rate or discount rate and n is the number <strong>of</strong> years from the present to the time<br />

<strong>of</strong> the payment. The present worth <strong>of</strong> a series <strong>of</strong> payment is obtained by summing each<br />

payment's present worth.<br />

(b) Levelizing refers to developing a single, constant unit charge, which recovers an expenditure<br />

associated with a facility or system including interest (see Section 3.2.8.2).

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