Abstract
The aim of this paper is to present the activities carried out by NEA Data Bank on checking, processing and verification of JEFF-3.3T4 covariances. A picture of the completeness and status of the JEFF-3.3T4 covariances is addressed. The verification of JEFF-3.3T4 covariances is performed with nuclear data sensitivity tool providing the keff uncertainty as a function of the contributing nuclide-reaction pairings including cross-reaction covariances. A total number of 4501 ICSBEP benchmarks is used in this analysis. This exercise is also extended to covariance libraries such as JENDL-4.0 updated files, ENDF/B-VII.1, SCALE-6.2rev8 and ENDF/B-VIII.0β5, allowing comparison of these results with both the experimental criticality benchmark and different methodologies of evaluation.
Highlights
JEFF-3.3T4 [1] is a fully consistent and complete nuclear data library with all data needed and associated covariance information, which can be reliably used for a large spectrum of applications, and which has shown a better performance than JEFF-3.2 library [2]
Previous work carried out by NEA Data Bank on checking, processing and verification of earlier JEFF-3.3 beta releases has been presented in past
A thorough review of the current covariance data files associated with the latest versions of the JENDL4.0 updated files (JENDL-4.0u) and ENDF/B-VII.1 evaluated data files can be seen in reference [9]
Summary
JEFF-3.3T4 [1] is a fully consistent and complete nuclear data library with all data needed and associated covariance information (full covariance information for the main actinides), which can be reliably used for a large spectrum of applications, and which has shown a better performance than JEFF-3.2 library [2]. Previous work carried out by NEA Data Bank on checking, processing and verification of earlier JEFF-3.3 beta releases has been presented in past. This information gives a good indication of the current status of JEFF-3.3T4 covariances. This work is extended to the whole nuclear data library with especial emphasis on the four major actinides, 233U, 235U, 238U, and 239Pu. a summary of the criticality uncertainty results is given in Tables 1–4, showing the impact and differences of current covariance nuclear data evaluations
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