基于钒 SPND 瞬发电流的最佳指示功率估计方法

During operation of the third-generation pressurized water reactor (PWR), the total power can be rapidly estimated based on the response current of the Self-Powered Neutron Detector (SPND). It can be referred to as the best estimate power method. Existing techniques rely on the assumption of a linear relationship between the total SPND current of Vanadium SPND and the total power (referred to as the total current estimation method), which cannot differentiate the time response of different current components. Thus, it is not suitable for transient operating conditions. To enhance the monitoring capability during operation, a novel estimation method based on the prompt current of Vanadium SPND is proposed, utilizing the SPND response current calculation feature in the NECP-Bamboo PWR core analysis software. This method can be applicable for both steady and transient operating process. The method is quantitatively compared with existing methods. Numerical results demonstrate that: 1) the deviations of the total current estimation method and the prompt current estimation method are both less than 1% of rated full power during the steady operation; 2) the deviation of the total current estimation method exceeds 50%, while the deviation of the prompt current estimation method is less than 1% during the Rapid Power Reduction (RPR) bank insertion process.