Studies on Ceramic Fuels with the Use of Fission Gas Release Loop, (III):Neutron Flux Monitoring in Specimen Chamber of FGRL by Counting Nitrogen-16 Generated 16 O(n, p) 16 N Reaction in Primary Cooling Water

Flux monitoring in the specimen chamber of FGRL was carried out by directly and continuously reading with a g-ray spectrometer the content of 16N in the primary cooling water produced by 16O(n,p)16N reaction within the cooling jacket of FGRL. 16N generation is not influenced by g-ray build-up in the reactor nor by the temperature in the specimen chamber. The detector can be simply set outside the pipe through which the cooling water flows, because the high energy g-rays (6.13MeV) emitted during the 16N decay easily penetrate the pipe wall.