Fuel failures detection and monitoring is a key issue in sodium-cooled fast reactor operation. This detection is based on monitoring the signal of fission products using dedicated radiation monitoring systems based on gamma spectrometry or neutron counting. In this context, the French Alternative Energies and Atomic Energy Commission (CEA) investigates and developpes a Compton suppression system composed by a high-purity germanium diode, a bismuth germanate scintillator and a dedicated digital signal processing allowing filtering coincidences. This approach enables the Compton noise to be filtered without impacting the useful signal from short-lived radioisotopes. Through a calculation scheme based on a validated MCNP6 model of the detector. It was demonstrated that the sodium degassing is a mandatory option reducing the minimal detectable activities of fission products by a factor of up to 27. The Compton suppression system leads to an additional minimization of minimum detectable activities up to a factor of 4 enabling the ease measurement of the ⁸⁹Kr safety indicator.

燃料故障的检测和监控是钠冷快堆运行中的关键问题。该检测基于使用专用辐射监测系统（基于伽马能谱或中子计数）监测裂变产物的信号。在这种情况下，法国替代能源和原子能委员会（CEA）研究并开发了康普顿抑制系统，该系统由高纯度锗二极管，锗酸铋闪烁体和专用数字信号处理系统组成，可以处理巧合。这种方法可以过滤康普顿噪声，而不会影响来自短暂放射性同位素的有用信号。通过基于验证的检测器MCNP6模型的计算方案。⁸⁹ Kr安全指示器。