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GRSAC was developed for gascooled reactor simulations, and it required some modifications and approximations in order to account for the different thermodynamic properties of the molten salt coolant relative to helium. Although the AHTR may include a DRACS to augment the RVACS heat removal and reduce peak vessel temperatures, it was not included in this decay heat analysis. A loss-of-forced-cooling (LOFC) with scram accident was simulated to determine the peak core and vessel temperatures and the amount of decay heat that could be removed using the passively safe RVACS.

0 MPa) and/or molten salt. 3. 7 † Power required to pump primary and intermediate fluids through the intermediate heat exchanger. *Molten salt is incompressible, so pressure and pumping power are independent, and pressure can be set to any desired value. 19 20 3. DESIGN ANALYSIS To date, the AHTR concept has evolved largely through the thoughtful and creative merging of design features from several other reactor designs. Earlier analyses made frequent use of scaling laws from similar reactor systems and have not kept pace with the evolving AHTR concept.

8 and are similar to the initial SNL results. 01% 6Li content. Increasing the fuel enrichment allows for slightly lower void reactivity effects, as also shown in Fig. 8. Calculations for the standard configuration at 10% 235U enrichment with natural boron in the fuel were made to determine BP effects on reactivity. 01% 6Li) or the NaF/ZrF4 salts. 0. This value is about 14 times more than the quantity of 6Li in the core. Arranging the configuration in an annular geometry with the same coolant fraction and fuel fraction was not found to be helpful in decreasing the void reactivity effect.

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