SPECIFICATION OF IRRADIATION CONDITIONS IN VVER-440 SURVEILLANCE POSITIONS

Some experimental results of VVER--440 surveillance specimens (SS) irradiation conditions investigation are presented in the paper. These results were obtained within SS programs and in framework of the international research programs carried out with the participation of RRC Kl. Experimental validation of different neutron calculation models has been done on the base of these data. Calculations of the lead factor and spectral index distribution in the surveillance channels of VVER--440 with full and reduced core (dummy assemblies at the periphery) are presented. The results of the work were used for elaboration of upgraded neutron dosimetry procedure for VVER440 SS and for re-evaluation of "old" surveillance dosimetry data.