SENSITIVITY ANALYSIS OF MONJU USING ERANOS WITH JENDL-4.0
- Publication date
- 2012
- Publisher
Abstract
This paper deals with sensitivity analysis using JENDL-4.0 nuclear data applied to the Monju reactor.
In 2010 the Japan Atomic Energy Agency β JAEA β released a new set of nuclear data:
JENDL-4.0. This new evaluation is expected to contain improved data on actinides and covariance
matrices. Covariance matrices are a key point in quantification of uncertainties due to basic nuclear
data. For sensitivity analysis, the well-established ERANOS [1] code was chosen because of its integrated
modules that allow users to perform a sensitivity analysis of complex reactor geometries. A
JENDL-4.0 cross-section library is not available for ERANOS. Therefore a cross-section library had
to be made from the original nuclear data set, available as ENDF formatted files. This is achieved
by using the following codes: NJOY, CALENDF, MERGE and GECCO in order to create a library
for the ECCO cell code (part of ERANOS). In order to make sure of the accuracy of the new ECCO
library, two benchmark experiments have been analyzed: the MZA and MZB cores of the MOZART
program measured at the ZEBRA facility in the UK. These were chosen due to their similarity to the
Monju core. Using the JENDL-4.0 ECCO library we have analyzed the criticality of Monju during
the restart in 2010. We have obtained good agreement with the measured criticality. Perturbation
calculations have been performed between JENDL-3.3 and JENDL-4.0 based models. The isotopes
239Pu, 238U, 241Am and 241Pu account for a major part of observed differences