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Extra info for Research Reactor Core Conversion Guidebook Vol 1 [Summary] (IAEA TECDOC-643v1)
In the case of reactors of significant thermal powers, power distributions were recalculated and the effects on thermal-hydraulic behaviour considered. Fuel material and cladding behaviour was discussed in detail, including fuel failure, reference being made to experimental investigation and fuel testing programmes. Where other significant changes had been made, their effects were also considered. In some cases the opportunity was taken to incorporate recently developed requirements into the safety analysis.
7\ [-~ I •- '--• ' ! -^ To wate r Vertical cross sections of the "Democritos,, reactor pool with the associated facilities. ' '/ Butterfly valve ;,\\ pipe ;:'"/ Extension pipe ~~\ Modification of cooling system inlet and outlet. FIG. 1. Proposed modification of the DEMOKRITOS reactor to incorporate an anti-siphon device to the existing system. 39 Main Cooling Pipe inlet FIG. 2. Pool longitudinal section for the SAPHIR reactor. 40 Shutter control Shutter Outer Ai-tube Ai-Membrane ColHmator penIng Silizium-Filter Slide valve Baryt-Concrete Vent-Pipe Watercontrol Stainless Steel Lining Standard Inner Aï-tube Concrete 1 1» Mil I 20 FIG.
958 g/cm3. - A safety benefit in changing from HEU to LEU fuel is the significant increase in the fuel temperature coefficient due to the Doppler effect. This coefficient is almost zero in HEU fuel. The reactivity feedback due to the Doppler effect is virtually instantaneous as the temperature of the LEU fuel meat increases, while the reactivity feedback due to increasing water temperature and decreasing water density is delayed because heat generated in the fuel meat must be first transferred to the cladding and then to the water.