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Apr 19 – 22, 2022
Vienna, Austria
Europe/Vienna timezone
FR22 starts in Vienna 19 - 22 April 2022 Online Stream:

Safety Analysis of Small Modular Sodium Fast Reactors in Anticipated Transients Without Scram Scenarios

Apr 20, 2022, 2:52 PM
Vienna, Austria

Vienna, Austria

ORAL Track 2. Fast Reactor Safety 2.3 Accident Analysis


Mr Xin Jin


The small modular sodium-cooled fast reactor (SFR) is an important component of Generation-IV reactors. For SFR, one type beyond design basis accidents (BDBA) that has received special attention is the anticipated transients without scram (ATWS) events including unprotected loss of coolant flow (ULOF) accident, unprotected loss of heat sink (ULOHS) accident and unprotected transient overpower (UTOP) accident. The modular design for multiple purposes and remote region operation requires usually very infrequent refueling strategy. During a long-lived operation, the neutronic characteristics of SFR core, for instance, the coolant void effect and the Doppler effect, vary and hence the reactor safety performance in ATWS events. This paper focuses on the analysis of safety performance of a 300 MWth small modular MOX SFR from its beginning of life (BOL, 0 GWd/tHM) to its end of life (EOL, 75 GWd/tHM). The burnup calculation is conducted by using Monte-Carlo code OpenMC with pin-by-pin depletion mesh. The elementary reactivity feedback coefficients and core power distribution are compared at different burnup depth. The transient behavior is simulated by using a newly developed mono-channel point kinetic system code dedicated to fast reactors. The inherent reactivity feedback mechanism in ATWS is classified. The influence of the fuel burnup, the power redistribution, and the control rod positions are investigated. Some solutions, for instance, the use of burnable poisons, the design of upper sodium plenum, the addition of moderators, are discussed in the view of mitigation of the ATWS impact and the inherent safety performance for a long operating lifetime.

Speaker's title Mr
Affiliation/Organization Shanghai Jiao Tong University
Country/Int. organization China
Speaker's email address

Primary authors

Mr Xin Jin Prof. Hui GUO (Shanghai Jiao Tong University) Mr Kuai Yuan FENG (Shanghai Jiao Tong University) Prof. Hanyang Gu (Shanghai Jiaotong University)

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