The Study on Sizing of the Pressure Relief Valve for Overpressure Protection of a Reactor Pressure Vessel in Low Temperature Condition

저온 상태의 원자로 압력용기의 과압방지를 위한 압력방출밸브 용량 결정에 관한 연구

The purpose of this study is to present a methodology to estimate the capacity of the pressure relief valve which prevents overpressure of the pressure vessel in a cold state. In this methodology, the transient behavior of the flow rate through the pressure relief valve and the pressure inside the pressure vessel are considered. The result of this study shows the followings; The more the relief valve capacity is considered in excess, the more the initial relief flow rate and the initial pressure inside the pressure vessel are high and low respectively. When the relief valve capacity is determined properly, the pressure inside the pressure vessel maintains almost the same value, so the ASME code requirement will be met.