Development of RELAP5-3D model for an integrated test facility for advanced reactor systems

幕内 悦予; 相澤 康介 ; 今井 良行  ; 上地 優; 赤坂 尚昭; Yan, X. ; 佐久間 渉*; 谷平 正典*

Makuuchi, Etsuyo; Aizawa, Kosuke; Imai, Yoshiyuki; Kamiji, Yu; Akasaka, Naoaki; Yan, X.; Sakuma, Wataru*; Tanihira, Masanori*

This paper presents the development and application of a RELAP5-3D model to assist in the design optimization of a 5MWt integrated electrically-heated test facility, making it capable to simulate the transient behaviours of advanced reactor systems based on high-temperature gas-cooled reactor and sodium-cooled fast reactors, and various production modes, such as power generation, hydrogen cogeneration, and heat storage. Built upon the existing capability of the RELAP5-3D code, the model incorporates the advanced component models and specific fluid properties required to compute thermal and fluid behaviours of the advanced reactors and their balance of plants. Through several iterations of design added by the insights gained through the RELAP5-3D simulation, the final facility design has successfully captured the realistic transient behaviours of full-scale reactor system designs rated at hundreds of megawatts in thermal power. The paper presents the development of the RELAP5-3D model for the facility, including modelling of unique components and fluids present in the facility and discusses how the model was successfully applied to analysing and closing the performance gaps of the small-scale test facility from key known transient behaviours of the full-scale plants, for which the facility design aims to simulate. The paper concludes by outlining the plan for further expansion of the mode l and for verification of the model through construction and testing of the facility.