In Japan, from 2011 to 2016, risk assessment of each type of equipment using A2L refrigerant wascarried out and JRAIA standard which prescribed safe operating method was created, resulting in therelaxation of law was realized. In order to respond to demand in recent years to further lower GWP,risk assessment of built-in refrigerated display cabinet using R290 was carried out. CFD analyses onrefrigerant leakage from inside or outside the refrigerated space of each type of refrigerated displaycabinet was carried out, flammable volume was calculated, potential ignition sources were investigated,and ignition probability was calculated. Risk assessments were carried out at each stage oftransportation, storage, installation, usage, service, and disposal. In this paper, the contents of thestudy and the safety operation method created as a result are summarized.
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