Test program for reactor control system in rise-to-power test in HTTR

Rise-to-power test programs for reactor control systems of the High Temperature Engineering Test Reactor (HTTR) have been established to confirm a stability performance during normal operation and anticipated perturbation. The performances of the pressurized water temperature control, the reactor inlet coolant temperature control, the reactor power control and reactor outlet coolant temperature control in the HTTR are not obtained until a reactor power rises up to enough level in a rise-to-power test. Some parameters such as proportional gain and reset time in a feedback controller can be decided through rise-to-power tests for reactor control systems. These test programs should be established with taking fully account of safety. This report presents the detailed program of rise-to-power tests for reactor control systems and discussed a fundamental consideration to perform safely the test. From the result of deep discussion, we obtained sufficient outlook to conduct all the tests safely and efficiently. Also the stable region to perturbation was made clear for each control system. (author)