Development of dynamic analysis code for HTTR hydrogen production system (Contract research)

Maeda, Yukimasa; Nishihara, Tetsuo ; Ohashi, Hirofumi ; Sato, Hiroyuki  ; Inagaki, Yoshiyuki

A heat and mass balance analysis code (N-HYPAC) has been developed to investigate transient behavior in the HTTR hydrogen production system. The code can analyze heat and mass transfer (temperature and mass and pressure distributions of process and helium gases) and behavior of the control system under both static state(case of steady operation) and dynamic state(case of transient operation). Analysis model of helium and process gases from IHX to secondary helium loop and hydrogen production system has been constructed. This report describes analytical flow sheet, construction of the code, basic equations, method to treat the input data, estimation of the preliminary analysis.