NEA Mandates and Structures

Expert Group on Improvement of Integral Experiments Data for Minor Actinide Management (EGIEMAM-II)

Chair(s): Kazufumi TSUJIMOTO, Japan
Secretary:  Shuichi TSUDA
Member(s):All NEA member countries
Full participant(s): European Commission
Under the NEA Statute
Observer(s)(International Organisation): International Atomic Energy Agency (IAEA)
By agreement
Date of creation:30 September 2014
End of mandate:30 September 2018

Mandate (Document reference):

Mandate (Document extract):

Extract from document NEA/SEN/NSC(2016)2

Needs and motivations

The Expert Group on Integral Experiments for Minor Actinide Management (EGIEMAM) has reviewed the existing integral experiments for MA management and identified a lack of experiments and insufficient accuracies in several areas. In many cases, useful results are not fully available, because of proprietary considerations. Moreover, EGIEMAM performed uncertainty analyses and target accuracy assessments and confirmed needs for improvements of nuclear data. After reviewing the integral experiments, EGIEMAM recognised that there exist only limited number of facilities and limited expertise and resources (materials, manpower, funding). Therefore, there is a need to prepare for a concerted effort paving the way for a common experimental program where resources can be optimised towards improving the MA nuclear data knowledge. In conclusion, EGIEMAM has recommended integral measurements, complementary to parallel efforts for differential measurements (to be coordinated by WPEC), for the following nuclides of MA from viewpoints of design of transmutation systems and of fuel cycles: 237Np, 241Am, 242mAm, 243Am, 242Cm, 243Cm, 244Cm and 245Cm.


To improve knowledge of MA nuclear data and to support the MA management technology development with reliable accuracy, and sufficient anticipation, the EG pointed out that many additional integral data are still necessary. The first step in this direction requires pooling resources and identifying qualified facilities, personnel, measurement techniques, and available supplies of materials to target experiments to meet specific MA data needs. From the lessons learned, two major categories, reactor physics and irradiation experiments, require specific actions by international collaboration.


The following will be conducted and reported to NSC.

The proposed areas of work are:

1. Identifications of systems of interest and associated target uncertainties.

2. Joint design of reactor physics MA measurements in selected facilities:

3. International collaboration of irradiation program for MA:

In addition, EGIEMAM recommends WPRS and WPFC to consider international comparison of analysis of integral experiments for MA as well as independent review of the outcomes of the expert group (cf. IRPhE, ICSBEP).


Links to other groups

The expert group will work in co-ordination with the Working Party on Scientific Issues of Reactor Systems (WPRS, including IRPhE Project), the Working Party on Scientific Issues of Fuel Cycle (WPFC), the Working Party on International Nuclear Data Evaluation Co-operation (WPEC, in particular with SG‑39 and SG-40-CIELO).