THE TEST METHOD AND SOME RESULTS FOR WWR-M FUEL.

In WWR-M reactors, the parameter used as the operational indicator of fuel elements non-integrity is the criterion (b), defined as the ratio of the number of fission fragments leaking out in the coolant to the number of fission fragments generated in the fuel [1, 2]. For stable equilibrium conditions: V b =--- , where q V- is the leakage out rate of nuclide from the fuel element into the coolant, and q- is the rate of nuclide generation in the fuel. The notion of non-integrity may be applied to an individual assembly, the entire core, or an individual fuel element. Admissible b values for a reactor core is limited on the radiation created by fission products within the reactor premises and environment. The average non-integrity of each fuel assembly determines the b value for the entir