Modifications and applications of DSNP modules to the THTR-300 steam generator

The dynamic simulator of nuclear power plants (DSNP) system is used to describe the dynamic behavior of the thorium high-temperature reactor (THTR)-300 power plant. Three different models of steam generators of different degrees of sophistication have been examined and compared. The OTSGM model stimulates an evaluated steam generator with a changeable number of nodes. The STGEN(19) model simulates a lumped parameter steam generator model. The STGEN(29) model simulates a six-node, general-purpose steam generator. The most stable module with the shortest run time is the STGEN(19) module. The elaborated OTSGM model gives good results but cannot work with integration ZGEAR2 module and has longer run times. It should be used when more detailed behavior of the steam generator must be known. The third model, STGEN(29) should be used in simulations where it is enough to have pipes and defined output flows, while the input secondary flow must be given from outside.