A pressurized water reactor production isotope simulation method and system based on a pin-by-pin model

Abstract

The present invention provides a pressurized water reactor production isotope simulation method and system based on a pin-by-pin model. By establishing a geometry with the same geometric structure asa fuel rod and a target of each assembly in a reactor, the influence of the structure of the target piece on an activation calculation result is considered. Meanwhile, the calculation of the nuclide distribution of the target piece is combined with a transportation model, a thermal hydraulic model and a burnup model, so that the situation that the self-shielding effect of the target piece cannot be considered due to the fact that the target piece is calculated only through the burnup model at present and the influence of the target piece on the power and neutron flux of the area of the reactorafter absorbing neutrons are eliminated, and the calculation precision of the specific activity of the target piece is improved.

Description

technical field [0001] The invention relates to the technical field of isotope production, and more specifically, to a pressurized water reactor production isotope simulation method and system based on a pin-by-pin model. Background technique [0002] Reactor, also known as nuclear reactor or atomic energy reactor, is a device that can maintain a controllable self-sustaining chain nuclear fission reaction to realize the utilization of nuclear energy. By rationally arranging the nuclear fuel in the reactor, the self-sustaining chain nuclear fission process can occur in it without the need for additional neutron sources. When a reactor is used to produce isotopes, a large amount of simulation calculation research on its engineering scheme is required, and the neutron flux at the location of the activated material (ie, the specific activity of the target) needs to be calculated. At present, the simulation calculation of the specific activity of the target is usually realized b...

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Problems solved by technology

[0004] The present invention aims to solve the problem that the specific activity determination method of the target in the current isotope production cannot accurately consider the influence of the reactor power in the area after the target absorbs neutrons, resulting in an inaccurate solution to the neutron flux in the environment where the target is located and the self-shielding effect of the target itself on neutrons cannot be accurately considered after the homogenization of the target, resulting in errors. The present invention provides a PWR production isotope simulation method based on the pin-by-pin model and system

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