Diagnosis and Modelling of Equivalent Circuit Combining WPT by Loosely Coupled Coils through CB Concrete Walls at SBO

According to 10 CFR 50.2, SBO (Station Blackout) in nuclear power plants represents a complete loss of a power source to the switchgear bus, including on-site emergency AC power systems as well as an integral part of a nuclear power plant. In this case, there was a situation where electric power could not be supplied to the measurement system, such as an accident at the No. 1 nuclear power plant in Fukushima, Japan. With simulation code to cope with this situation, we have prepared a new alternative method of loosely coupled coils to supply wireless power through container walls. The transmission output of wireless power of the CB reinforced concrete test piece is supplied as the input of the 4 ~ 20mA equivalent circuit model, and this circuit is a cord connection method that can be configured with RLC passive elements. The special function of the code used in this model is to apply an input reference pulse to obtain the temperature response characteristics of the circuit passive elements according to the range of ambient temperature conditions. At this time, the temperature response characteristic applies a reference pulse signal to the input to analyze the abnormal signal pattern of the output change amount according to the temperature changing range in the NPP accident condition. In this case, the results of the transmitted efficiency calculation get in the range of about ~ 1% by WPT. At that time, a pulse parameter output with a temperature sweep range of 27 °C to 750 °C can be applied with the R-C passive element in the equivalent circuit model.