Use of probability analysis of reliability in designing nuclear power facilities

A critical evaluation is made of the existing method of assessing the reliability of the primary and secondary cooling circuits in the project design stage. Individual programs of quality assurance comprising all stages of the development and operation of the given equipment do not provide a satisfactory quality assurance such as would guarantee the safety of complex systems of primary circuit control. For most components of the secondary circuit such programs are non-existent and the components manufactured are of mediocre quality. In the primary circuit all measurements are carried out often in doubled majority logic of 2 out of 3. Realibility problems are studied in a number of research tasks, also through Czechoslovakia's involvement in the IAEA PRA/PSA program, i.e., the Probabilistic Risk (Safety) Assessment program. (J.B.). 4 refs