Preliminary Study on Thermal-Load Fluctuation Test Using HTTR

Abstract

JAEA has designed and developed a commercial very high temperature reactor hydrogen cogeneration system named GTHTR300C. JAEA has investigated that a hydrogen production facility is treated as not a reactor grade facility but a general industrial plant grade facility. The reactor plant system should be designed absorbing the disturbance under AOO and becoming to steady state in the case that thermal-load of the facility is fluctuated or lost. Also, high-accuracy plant dynamics code should be developed to design the GTHTR300C. In order to demonstrate continuing the reactor operation in if the AOO is occurred in the hydrogen production facility and to obtain the validation data for high-accuracy plant dynamics code, the thermal-load fluctuation tests were planned using the HTTR in JAEA. In this study, it is concluded that the thermal-load fluctuation tests can be carried out without reactor scram and without modification of the HTTR facility and that the test data for validation of the code can be obtained sufficiently.

Establishment of control technology of the HTTR and future test plan

“…Previous studies [4,5] have been focused on the test without main control system to study on physical phenomena. Therefore, preliminary studies with all main control system are carried out to study the control characteristics of the thermal-load fluctuation test and determine test conditions on normal operation state such as the amount of decrease in the flow rate of the ACL.…”

“…Also, the basic data to validate plant dynamic codes for the HTGR with the heat utilization system can be obtained. Therefore, the thermal-load fluctuation test of the heat utilization system has been planned in future [4,5].…”