Abstract
China is developing the nuclear data processing code Ruler, which can be used for producing multi-group cross sections and related quantities from evaluated nuclear data in the ENDF format [1]. The Ruler includes modules for reconstructing cross sections in all energy range, generating Doppler-broadened cross sections for given temperature, producing effective self-shielded cross sections in unresolved energy range, calculating scattering cross sections in thermal energy range, generating group cross sections and matrices, preparing WIMS-D format data files for the reactor physics code WIMS-D [2]. Programming language of the Ruler is Fortran-90. The Ruler is tested for 32-bit computers with Windows-XP and Linux operating systems. The verification of Ruler has been performed by comparison with calculation results obtained by the NJOY99 [3] processing code. The validation of Ruler has been performed by using WIMSD5B code.
Highlights
The Ruler is a computer code package for generating multi-group cross sections and related quantities from evaluated nuclear data in the ENDF format.The objective to create the computer programs for the production of multi-group constants for the calculation of reactor physics using evaluated data was conceived 6 years ago
The Ruler can be used for generating the WIMS-D format data files from ENDF format files
The resulting pointwise cross sections are written onto a “point-ENDF” (PENDF) file for future use
Summary
The Ruler is a computer code package for generating multi-group cross sections and related quantities from evaluated nuclear data in the ENDF format. The objective to create the computer programs for the production of multi-group constants for the calculation of reactor physics using evaluated data was conceived 6 years ago. The well-proven models and methods for generating multi-group constants are used, including resonance reconstruction, Doppler broadening, thermal scattering processing, group cross section and scattering matrices computing, as well as resonance self-shielding treatment. The Ruler consists of a set of functional modules, each performing a defined processing task. They are main code, data management modules, physics modules, interface modules. The Ruler is China’s first multi-group constants generating code system for reactor physics and shielding design, and the development of Ruler will be continued
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