Abstract：With regard to a KBS-3v schemed geological repository for disposal of high level nuclear waste，a canister distributed line heat source analytical model(model I) is developed for the prediction to the 3D transient temperature field，and sample calculation analyses are conducted. The objectives are to compare with three other analytical models in the literature，i.e. the canister distributed point heat source analytical model(model II)，the drift distributed line heat source analytical model(model III)，and the zone areal heat source analytical model (model IV)，and to analyze the spatial distribution patterns and temporal variation features of the temperature field，and to study the influences of the spacing of the waste canisters on the temperature rise of the bentonite backfill. The calculations indicate：for the surrounding rocks，there are some differences in the vicinity of the canisters between the temperature solutions from model I and the three other analytical models，but with the increase of distances from the canisters and the attenuation of heat power of the canisters，such differences of temperature solution from the four different analytical models tend to diminish correspondingly；for the bentonite backfill，the peak temperature increment from model I is 27% smaller than model II，7% larger than model III，16% larger than model IV；according to model I，the temperature in the vicinity of the canisters increases drastically within the initial 100 years，and exceeds over 30 degrees Celsius based on the virgin rock temperature during 100th to 700th year，but later decreases as the heat power of the canisters attenuates; both the temperature and its rate of variation in the bentonite backfill increase if the spacing between the canisters is reduced，and so does the sensitivity. Model I is geometrically more consistent with reality，thus the calculation results are more rational，than the other three existing models.
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2019, Vol. 38 
