The present paper considers the approach to an assessment of technological
radiation sources in the primary water-water reactor circulation loop. In
principle, such an evaluation is a multidisciplinary task that covers not
only the irradiation of the nuclei, the formation of new isotopes and their
decay when they are unstable, but also calculations in the field of
hydraulics in order to perform an assessment of the irradiation time and the
decay time. A general and a more detailed review of the radiation sources
formation in the nuclear facilities and the pool type research reactors with
demineralized water as a heat carrier are prepared. The initial isotopic
composition of the heat carrier has been adopted according to the Vienna
Standard Mean Ocean Water recommended by the International Atomic Energy
Agency. The general mathematical model of the processes of nuclei
irradiation, the formation of new isotopes and their decay, the assessment
of the irradiation time and the decay time is described in details, enabling
the repetition of this evaluation to a particular facility. The presented
approach is applied in the reconstruction design of the nuclear research
reactor IRT-2000, Sofia, Bulgaria.
Evaluation of fast fission factor in a typical pool type research reactor
