Abstract
Offshore nuclear small reactor is a promising research direction during recent years. In order to carry out system simulation and safety analysis under accident conditions for marine reactors, the classic thermal-hydraulic system analysis code RELAP5 is modified by taking heaving, inclining and rolling motion into consideration in this paper. Additional forces are added to the momentum equation for heaving and rolling, and control volume coordination are transformed for inclining and rolling. Then, a simplified small reactor with two loops is simulated by the modified code and the effect of ocean motion is investigated. Generally, heaving leads to the periodic fluctuation of mass flow rate, inclining would cause the decrease of total mass flow through the core, and the effect of rolling is more complex. Simulation analysis is also performed on two design basis accident LOCA and LOFA in this study. Safety related conclusions are obtained about the impacts of various ocean motion.
Highlights
Nuclear energy has broad application prospects on marine power, exploitation of offshore resources and offshore power generation platform
As the modification of thermal hydraulic system code is an effective approach to analyze characteristics of small marine reactor under ocean conditions, in this paper, the widely used system code RELAP5 is modified by introducing additional forces into momentum and
In order to simulate the small reactor behavior under ocean environment, additional forces are added on the momentum equation of RELAP5 code
Summary
Nuclear energy has broad application prospects on marine power, exploitation of offshore resources and offshore power generation platform. As the modification of thermal hydraulic system code is an effective approach to analyze characteristics of small marine reactor under ocean conditions, in this paper, the widely used system code RELAP5 is modified by introducing additional forces into momentum and The simplified model of small reactor is built, and simulation is performed under the normal operation and design basis accident conditions to study the effect of ocean motions.
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