Abb Atom Ab

Westinghouse Atom Ab

Lembit Sihver

Bj&ouml;rn Bjurman

Inger Arleb&aring;ck

A device for determining, by detection and calculation, nuclide contents of radioactive inert gases. The device includes a measuring chamber ( ) which contains the inert gases, a detector ( ) which detects gamma radiation emitted from the radioactive inert gases, calculating members ( ) which, based on the detected gamma radiation, calculate the content of the different nuclides.

Device for determining nuclide contents of radioactive inert gases

The invention concerns a method and a device for evaluating the integrity of the nuclear fuel in a nuclear plant having a reactor ( ) enclosing a reactor core formed by a number of fuel cladding members ( ) arranged to enclose said nuclear fuel. The value of each of a number of parameters including activity data ( ) of the off-gases from the reactor is determined. The value of each of a number of second parameters including chemical data and activity data of the liquid ( ) flowing through the reactor is determined. The value of each of a number of operational parameters ( ) including at least one of the reactor effects, control rod position, actual fuel type, flow of off-gases, and flow of the liquid flowing through the reactor is determined. The value of the first and second parameters are standardized ( ) in relation to the values of said operational parameters. The standardized values and the values of the operational parameters are analysed ( ) and the integrity of the fuel is estimated based on the analysis. The invention also comprises producing guidelines for the continuing operation of the plant with regard to said estimation.

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Västerås, Sweden

Lembit Sihver