An Explicit Method for Constructing Continuous Energy Sections in Indistinguishable Resonance Regions

Abstract

An explicit method for constructing continuous energy cross-sections in the indistinguishable resonance region. The position of the resonance peak in the indistinguishable resonance region is obtained by sampling the average resonance energy level spacing, and the resonance widths of different reaction channels at each resonance peak are obtained by sampling the resonance width. Resonance parameters at each resonance peak position not given in the energy point in the evaluation nuclear database are obtained by interpolating the resonance parameters in the evaluation nuclear database; The continuous energy point section at different temperatures can be obtained by using the Le broadening formula; the invention can explicitly construct the continuous energy section of the indistinguishable resonance region, which is used to meet the high-precision calculation requirements of the self-screen section of the indistinguishable resonance region of the modern reactor.

Description

technical field [0001] The invention relates to the field of reactor physical calculation and nuclear data processing, in particular to an explicit indistinguishable resonance region continuous energy cross-section construction method. Background technique [0002] With the rapid development of high-fidelity reactor physics calculation methods, the accuracy of calculation models 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 a key bottleneck for accuracy improvement. At present, the nuclear database creation method developed according to the characteristics and needs of traditional water-cooled reactors can no longer meet the urgent needs of advanced reactor design for high-precision nuclear data. [0003] However, in the production of the nuclear database for reactors, the calculation of the self-screen section of the indistinguishable resona...

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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