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

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K.7<br />

TABLE K.1.2. Thermal Load Limits for Conceptual Repository Designs<br />

Canister Limits During Retrieval Period (kW)(b)<br />

Thermal Load Limit (controlling factor)(a)<br />

Salt Granite Shale Basalt<br />

Vitrified glass HLW 3.2(A) 1.7(A) 1.2(A) 1.3(A)<br />

Calcined HLW 2.6(A) 1.6(A) 1.1(A) 1.1(A)<br />

Near Field Local Areal Thermal Loading Limits(c)<br />

(kW/acre)<br />

5-yr retrieval--HLW 150(B) 190(B) 120(B) 190(B)<br />

5-yr retrieval--spent fuel (e) 190 (B)f) 190 ( 8 ) (f ) 190(B)<br />

Far-Field Average Repository Thermal Loading(d)<br />

Limits (kW/acre)<br />

HLW 150(C) 190(B) 120(B) 190(B)<br />

Spent fuel 60(C) 190(B) 120(B) 190(B)<br />

(a) Controlling factors: A = Canister temperature limit<br />

B = Room closure<br />

C = Earth surface uplift.<br />

(b) Analysis assumes 15-cm annulus <strong>of</strong> crushed rock around waste package.<br />

(c) Acreage includes rooms and adjacent pillars, but not corridors, buttress pillars, and<br />

receiving areas.<br />

(d) Acreage includes storage area for waste including corridors and ventilation drifts, but<br />

does not include area for shafts, or storage areas for other waste types if separate.<br />

(e) In salt, the emplacement <strong>of</strong> spent fuel and HLW with plutonium is controlled by the more<br />

restrictive 60 kW/acre far-field thermal limit. Otherwise the near-field limit would<br />

be 150 kW/acre.<br />

(f) In order to maintain spent fuel cladding temperatures within the 300 0 C limit with these<br />

areal thermal loadings, the annulus around the canister is left open (no backfill).<br />

Heat is transferred across this air space more readily than through crushed backfill<br />

material and results in cooler canister and cladding temperatures.<br />

TABLE K.1.3. Cummulative Heat <strong>Generated</strong> by 10-Yr-Old<br />

Spent Fuel and High-Level <strong>Waste</strong><br />

kW-yr/MTHM<br />

Spent Fuel HLW<br />

Years Once-Through Cycle U & Pu Recycle<br />

0 0 0<br />

10 9 9<br />

50 40 30<br />

100 58 36<br />

200 78 43<br />

300 92 46<br />

400 102 49<br />

500 116 50<br />

1000 143 55

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