Control system characteristics

JAEA conducted an improvement of the RELAP5 MOD3 code (US NRC, 1995), the system analysis code originally developed for LWR systems, to extend its applicability to VHTR systems (Takamatsu, 2004). Also, a chemistry model for the IS process was incorporated into the code to evaluate the dynamic characteristics of process heat exchangers in the IS process (Sato, 2007). The code covers reactor power behaviour, thermal-hydraulics of helium gases, thermal-hydraulics of the two-phase steam-water mixture, chemical reactions in the process heat exchangers and control system characteristics. Field equations consist of mass continuity, momentum conservation and energy conservation with a two-fluid model and reactor power is calculated by point reactor kinetics equations. The code was validated by the experimental data obtained by the HTTR operations and mock-up test facility (Takamatsu, 2004 Ohashi, 2006). 

Control System Characteristics For The Coolant System Of Example 23.3... 

Once a mathematical model is formulated, the control system characteristics can be analytically or empirically determined. The basic characteristics that are the object of the control system design are ... 

In the first place the degree of automation has to be fixed. Very simple manually operated experimental plants may only need few measuring and indicating instruments placed in the location of the measurement in question, hand-operated controllers and final control elements. With an increasing number of control loops and registers the burden on the personnel decreases. The control system characteristics have to be adapted to the dynamic behaviour of the control loop. Controllers with the following characteristics are distinguished (cf. [1]) ... 

---