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The 4S is a sodium-cooled small fast reactor designed to supply energy and hot water on isolated islands or in remote locations. Small reactors are often said to have disadvantages in terms of economies of scale. This problem can be overcome by making the structure simple, doing away with the need for maintenance, and designing a core that requires no refueling during reactor lifetime. Taking into account the nature of current demand from the economy and the market, there are two options for the electrical output of the 4S reactor: 10MWe and 50MWe. The core of the 10MWe 4S reactor (4S-10M) has a 30-year lifetime without refueling. Metallic fuel is employed. Burn-up reactivity loss of the 4S is regulated by neutron reflectors which surround the core. All temperature reactivity coefficients including void reactivity are kept negative during core life-time. The 4S-10M is a tall pool-type reactor. It has an intermediate heat exchanger (IHX) in the annulus space inside the reactor vessel (R/V). There are two primary electro-magnetic pumps (EM pumps) in serial under the IHX, and an air flow path on the surface of the guard vessel (G/V) as a decay heat removal system (RVACS; Reactor vessel auxiliary cooling system). The secondary sodium heated in the shell part of the IHX flows to the steam generator (SG) via the tubes of the air cooler of the intermediate reactor auxiliary cooling system (IRACS). The decay heat removal systems of 4S-10M consist of a RVACS and IRACS. Both are passive systems. To clarify the safety margin of the 4S-10M, it is important to confirm the characteristics of the two decay heat removal

ICONE15-10603 HEAT REMOVAL CHARACTERISTICS OF THE 10MWE SODIUM COOLED SMALL FAST REACTOR (4S)