Method of obtaining full-reactor effective resonance self-shielding section

Abstract

The invention discloses a method of obtaining a full-reactor effective resonance self-shielding section. Dankov correction factors of all fuel rods of the whole reactor are solved and obtained througha neutron current method, equivalent one-dimensional rod models of all the fuel rods are then equivalently obtained through the Dankov factors, moderator radiuses of three typical one-dimensional rodmodels are selected from all the equivalent one-dimensional rod models, the fuel temperatures of the three typical one-dimensional rod models and the burnup depths of the burnup areas of the two typical one-dimensional rod models are selected according to calculation requirements, a plurality of typical one-dimensional rod models are constructed for the numerical values of the three variables ina one-to-one combination manner, the typical one-dimensional rod models are solved by adopting an ultra-fine group resonance calculation method, the effective self-shielding section of the resonance nuclide in the typical one-dimensional rod model is obtained, the effective self-shielding section is made into an interpolation table with the moderator radius, the fuel temperature and the burnup depth as interpolation variables, interpolation is conducted on all the equivalent one-dimensional rod models needing to be calculated, and the effective self-shielding section of the resonance nuclide in all the fuel rods is obtained. Thus, the accurate and effective self-shielding section of the whole reactor can be quickly obtained.

Description

technical field [0001] The invention relates to the field of nuclear reactor core and nuclear reactor physical calculation, in particular to a calculation method for obtaining the effective resonance self-shielding section of the whole reactor. Background technique [0002] With the development of nuclear energy, nuclear energy systems for various purposes have been designed. With the emergence of various new designs of nuclear energy systems, especially the emergence of small reactor designs, the requirements for safety and economy of reactor devices are constantly increasing. The improvement of the traditional resonance calculation method is highlighted, and it can no longer meet the needs of the design. Therefore, it is imminent to develop a fast and high-precision effective self-screening section calculation method. [0003] Traditional effective self-screen calculation methods include equivalence theory, subgroup method and superfine group method. Equivalence theory a...

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Problems solved by technology

However, due to the slow calculation speed of the ultrafine group calculation method, it is only applied to the single cell calculation, and cannot be applied to the design calculation of the reactor system.

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