Method for detecting degree of cleanliness of reactor core fuel assembly

Abstract

The invention relates to a method for detecting the degree of cleanliness of a reactor core fuel assembly. The method includes the following steps that first, the total quantity of stains on the surface of the entire fuel assembly and the activity of all nuclides in a cooling agent are obtained through theoretical calculation, and the corresponding relation between the total quantity of the stains and the activity of all the nuclides is found out; then the activity of all the nuclides in the cooling agent is obtained through actual measurement; the activities of all the nuclides, obtained in the above two steps, are compared and analyzed, and accordingly the total quantity of the nuclide stains on the surface of the entire fuel assembly is obtained. By the adoption of the method, the surface contamination condition of the fuel assembly can be determined quickly, no extra measurement or operation to the fuel assembly by a nuclear power plant operating unit is needed, the problem that the surface contamination of a traditional fuel element cannot be determined easily is solved, and a fast and feasible method is provided for detection of the degree of cleanliness of the reactor core fuel assembly. The structure is simple and implementation is convenient.

Description

technical field [0001] The invention belongs to the field of cleanliness detection, and in particular relates to a detection method for the cleanliness of a core fuel assembly. Background technique [0002] On the one hand, nuclear reactors require safe and stable operation, and on the other hand, they require protection of workers and the public outside the site from excessive radiation exposure and radioactive pollution of the environment. The radiation source item in the primary circuit is the source of power plant operation management, waste management system design and radiation protection design. The radionuclides in the coolant of the PWR primary circuit include fission products, actinides, activated corrosion products, and activated products produced by the activation of additives or impurities in the primary circuit, among which fission products and activated corrosion products are the main ones. The contribution of fission products to the radiation field is genera...

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Problems solved by technology

[0004] Aiming at the defects existing in the prior art, the present invention provides a method for detecting the cleanliness of the core fuel assembly, which quickly detects the total amount of fuel contamination on the surface of the fuel assembly during the manufacturing process, wit

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