3. DESCRIPTION OF PROGRAM OR FUNCTION
ERRORJ produces multigroup covariance matrices from ENDF-6 format following mainly the methods of the ERRORR module in NJOY94.105.
NEW VERSION DIFFERS FROM PREVIOUS VERSION IN THE FOLLOWING FEATURES
Additional features in ERRORJ with respect to the NJOY94.105/ERRORR module:
- expands processing for the covariance matrices of resolved and unresolved resonance parameters
- processes average cosine of scattering angle and fission spectrum
- treats cross-correlation between different materials and reactions
- accepts input of multigroup constants with various forms (user input, GENDF, etc.)
- outputs files with various formats through utility NJOYCOVX (COVERX format, correlation matrix, relative error and standard deviation)
- uses a 1% sensitivity method for processing of resonance parameters
- ERRORJ can process the JENDL-3.2 and 3.3 covariance matrices.
Additional features of the version 2 with respect to the previous version of ERRORJ:
- Since the release of version 2, ERRORJ has been modified to increase its reliability and stability,
- calculation of the correlation coefficients in the resonance region,
- Option for high-speed calculation is implemented,
- Perturbation amount is optimised in a sensitivity calculation,
- Effect of the resonance self-shielding can be considered,
- a compact covariance format (LCOMP=2) proposed by N. M. Larson can be read.
Additional features of the version 2.2.1 with respect to the previous version of ERRORJ:
- Several routines were modified to reduce calculation time. The new one needs shorter calculation time (50-70%) than the old version without changing results.
- In the U233 and Pu241 files of JENDL-3.3 an inconsistency between resonance parameters in MF=32 and those in MF=2 was corrected.
This version differs from the previous one (NEA-1676/05) in the following: ERRORJ2.2.1 was modified to treat the self-shielding effect accurately.
This version differs from the previous one (NEA-1676/06) in the following: ERRORJ2.2.1 was modified to reduce the calculation time and to make it easy to incorporate ERRORJ into the NJOY code system.
In May 2010, two bugs were found in the FORTRAN source. This information was documented/reported to the author.