Abstract
This paper is focused on the normal and abnormal operational states of small nuclear reactor (integral pressurized water reactor) by analysing with thermal hydraulic system code RELAP5/MOD3.4. For this purpose, the reactor considered is INSURE-100 with the power output of 100 MW. Concerning with the normal operational conditions, the steady-state results as well as load variation characteristics have been carried out and for the abnormal conditions, preliminary assessment of the reactor under two accident conditions i.e., loss of feed water and main steam line break have been researched and are well explained with the help of graphical analysis by using RELAP5 code. The research is also focused on the safety of the considered reactor, and for this purpose the reactor was design to be of pool-type reactor. The graphical results and the parameters that have been extracted from the RELAP5/MOD3.4 code show good agreement for the safe evaluation of the reactor.
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