Monitoring of In-Core Power Distribution by Ex-Core Detectors

For most reactors,the ex-core ion-chambers are the only real-time nuclear detectors.The necessity and the possibility to monitor the in-core power distribution are discussed in this paper,and the methodology to monitor the in-core power distribution via ex-core detector readings based on the harmonics synthesis method and detector spatial response function are proposed,and the preliminary numerical results are presented for the low-temperature heating reactors and high-temperature gas-cooled reactors,therefore the feasibility is demonstrated.