Framatome & Cie.

Guy Le Rat

Stephane Vivet

Jean-Marc Lagache

The method according to the invention consists of sampling, at successive times separated by constant or non-constant time intervals, signals supplied by redundant channels measuring or calculating the parameter and validating a value of said parameter, as a function of a sample of N values of each channel, in which N.gtoreq.2. In a preferred manner, each sample of N values is modeled by a straight line using the method of least squares and the validated value of the parameter is worked out as a function of the inter-coherent models.

Method for validating the value of a parameter

The invention relates to a process for monitoring leaks in the primary circuit of a pressurized water nuclear reactor. The primary circuit consists of the vessel (1), the primary part of the steam generators (6), pipework (3, 4), the pressurizer (10) and various stocktanks (20). Connected to the primary circuit is at least one auxiliary circuit such as the circuit for volumetric and chemical monitoring comprising a stocktank (17). A sectioning of the primary circuit and of the circuit for volumetric and chemical monitoring into volume elements, excluding the stocktanks (20, 17) is determined. At regular time intervals, or steps, the mass of water in each of the volume elements and in each of the stocktanks is determined from measurements of pressure, temperature and levels and then, by addition, of the total mass of water. The means values of the masses of water are calculated over periods of time corresponding to a multiple of the steps and offset in time by at least one step, together with the difference of the mean values corresponding to two successive periods of time, the difference representing the leakage flow in the primary circuit. The invention applies in particular to nuclear reactors with three or four loops.

Process for the monitoring of leaks in the primary circuit of a

Method of monitoring a nuclear power station by gathering information, called parameters, relating to the operation and state of the power station and its auxiliary equipment, comparing these parameters with reference data corresponding to normal operation, and signaling the differences, in order to permit an operator to evaluate the state of the power station very quickly, and to undertake any needed steps promptly.

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Torcy, France

Guy Le Rat