Pressure drop evaluation of the hydrogen circulation system for JSNS

Tatsumoto, Hideki; Aso, Tomokazu ; Otsu, Kiichi; Kato, Takashi; Futakawa, Masatoshi  

In J-PARC, an intense spallation neutron source (JSNS) driven by a proton beam of 1 MW has selected supercritical hydrogen with a temperature of around 20 K and the pressure of 1.5 MPa as a moderator material. A hydrogen circulation system has been designed to provide supercritical hydrogen to the moderators and remove the nuclear heating there. It is important for the cooling design of the hydrogen circulation system to understand the pressure drops through the equipments. In this work, the pressure drop through each component was analyzed by using a CFD code, STAR-CD. The correlation of the pressure drops through the components that can describe the analytical results within 14 % differences has been derived. It is confirmed that the pressure drop in the hydrogen circulation system would be estimated to be 37 kPa for the circulation flow rate of 160 g/s by using the correlations derived here, and is sufficiently lower than the allowable pump head of 100 kPa.