Steady-state Thermal-hydraulic Analysis of the TRIGA Plate Core Design by Using COOLOD-N2 and RELAP5 Codes (Surip Widodo1, a), Endiah Puji Hastuti1,b) , Sudjatmi Kustituantini Alfa2, c),Reinaldy Nazar2,d)

Abstract. The COOLOD-N2 and RELAP5 codes have been applied for a steady-state thermal-hydraulic safety analysis
of the 2 MW TRIGA Plate core design at the BATAN, Indonesia. In order to get the best prediction, the maximum
allowable axial node division was applied in COOLOD-N2 input model and the RELAP5 input nodalization was adjusted
to match the COOLOD-N2 input model. The main objective of this research is to confirm the safety margins of different
safety related parameter by steady-state calculation at full power level (2 MW). Therefore, we have calculated the coolant
temperature, cladding surface temperature, fuel center temperature, departure from nucleate boiling ratio, and onset of
nucleate boiling temperature profile across the hottest channel. The most significant conclusion is that all obtaining
values indicate the reactor has enough safety margin.
Keywords: STEADY-STATE, COOLOD-N2, RELAP5, TRIGA PLATE, DNB, SAFETY