Explicit indistinguishable resonance region continuous energy section construction method

Abstract

The invention discloses an explicit indistinguishable resonance region continuous energy section construction method, which comprises: sampling average resonance energy level spacing to obtain formant positions of an indistinguishable resonance region, and sampling resonance widths to obtain resonance widths of different reaction channels at each formant; during the period, performing interpolation on resonance parameters in the evaluation kernel database to obtain resonance parameters at all formant positions not in energy points given by the evaluation kernel database; and then, through a multi-energy-level Blade-Wigner formula and a Psi-Chi Doppler broadening formula, obtaining continuous energy point sections at different temperatures. According to the method, the continuous energy cross section of the indistinguishable resonance region can be explicitly constructed, so that the high-precision self-shielding cross section calculation requirement of the indistinguishable resonance region of a modern reactor can be met.

Description

technical field [0001] The invention relates to the fields of reactor physical calculation and nuclear data processing, in particular to an explicit method for constructing a continuous energy section of an indistinguishable resonance region. Background technique [0002] With the rapid development of high-fidelity reactor physics calculation methods, the accuracy of the calculation model has been significantly improved, and the nuclear data used in reactor physics calculations (that is, nuclear data for reactors) has become the main source of calculation errors and the key bottleneck for accuracy improvement. At present, the reactor nuclear database production method developed according to the characteristics and requirements of traditional water-cooled reactors can no longer meet the urgent needs of advanced reactor design for high-precision nuclear data. [0003] In the process of making the nuclear database for the reactor, the calculation of the self-screen section in t...

AI Technical Summary

Problems solved by technology

The traditional method only calculates the self-screening sections under different background sections on a small number of energy grids given by the evaluation nuclear database, and calculates the self-screening sections at other energies by linear interpolation of the sections, which will ignore the inter-nuclides resonance peaks The change of the background section caused by the interference causes a large error to the self-screen section

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