DEVELOPMENT OF A PASSIVE REACTOR SHUTDOWN DEVICE TO PREVENT CORE DISRUPTIVE ACCIDENTS IN FAST REACTORS:

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  • (2) A STUDY ON SELECTING CANDIDATE FUEL MATERIALS FOR THE BASIC DEVICE

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<p>Feasibility of a concept of innovative subassembly-type passive-reactor-shutdown device has been studied, targeting to strengthen safety-"diversity" and -"robustness" of measures to prevent core damage accidents in sodium-cooled fast reactors. We have investigated target measures to achieve inherent safety capability under unscrammed (Anticipated Transient without Scram; ATWS) events in a 750MWe class mixed oxide-fuel fast reactors. As the countermeasure to prevent occurrence of core disruptive accidents (CDAs), we have built a basic proposal of this passive device designs, taking into accounts for engineering restrictions to be required in some design phase. Two types of the devise subassembly are discussed in this work; one device utilizes metal-fuel-alloys and another device salt compound to meet required passive capability.</p><p>In this study we have determined the basic specifications of device fuel materials for alloy-type Pu-U-Fe alloy and salt-type (U-Pu) Cl3, respectively. Ternary Pu-U-Zr alloy is selected for the candidate fuel materials used in the pre-heating pins placed within this device subassembly. Through the studies, it has been suggested that the effectiveness and applicability of U-Pu-Fe alloys and low-enriched U (LEU) -Fe alloys as device fuels span a wide range of fast reactors to enhance safety tolerances against CDAs.</p>

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