Flexible Conversion Ratio Fast Reactor Systems Evaluation

Neil Todreas ; Pavel Hejzlar

关键词: ACCIDENTS;    BRAYTON CYCLE;    CONVERSION RATIO;    COOLANTS;    COOLING SYSTEMS;    DESIGN;    EVALUATION;    FAST REACTORS;    FLUORIDES;    LITHIUM;    POWER DENSITY;    REACTIVITY COEFFICIENTS;    REACTOR SHUTDOWN;    REACTOR VESSELS;    SODIUM COOLED REACTORS;    THERMAL EXPANSION;   

DOI  :  10.2172/937203
RP-ID  :  DOE/ID/14733
PID  :  OSTI ID: 937203
Others  :  Other: Project 06-040 (NERI)
Others  :  TRN: US0805792

美国|英语

来源: SciTech Connect

【 摘 要 】

Conceptual designs of lead-cooled and liquid salt-cooled fast flexible conversion ratio reactors were developed. Both concepts have cores reated at 2400 MWt placed in a large-pool-type vessel with dual-free level, which also contains four intermediate heat exchanges coupling a primary coolant to a compact and efficient supercritical CO2 Brayton cycle power conversion system. Decay heat is removed passively using an enhanced Reactor Vessel Auxiliary Cooling System and a Passive Secondary Auxiliary Cooling System. The most important findings were that (1) it is feasible to design the lead-cooled and salt-cooled reactor with the flexible conversion ratio (CR) in the range of CR=0 and CR=1 n a manner that achieves inherent reactor shutdown in unprotected accidents, (2) the salt-cooled reactor requires Lithium thermal Expansion Modules to overcme the inherent salt coolant's large positive coolant temperature reactivity coefficient, (3) the preferable salt for fast spectrum high power density cores is NaCl-Kcl-MgCl2 as opposed to fluoride salts due to its better themal-hydraulic and neutronic characteristics, and (4) both reactor, but attain power density 3 times smaller than that of the sodium-cooled reactor.