The 2015 Frédéric Joliot / Otto Hahn Summer School on Nuclear Reactors, Physics, Fuels and Systems

Frédéric Joliot and Otto Hahn

Frédéric Joliot and Otto Hahn


Karlsruhe, Germany
August 19 – 28, 2015

Enhanced Reactor Safety – Design and Simulation of Evolutionary LWR Cores


Karlsruhe Castle Karlsruhe Hotel Akademie Karlsruhe Pyramide
Karlsruhe Castle Karlsruhe Akademiehotel Karlsruhe Pyramide

Jointly organized by
the Nuclear Energie Division of the Commissariat à l’Energie Atomique (CEA/DEN), France,
and the Karlsruhe Institute of Technology (KIT/INR), Germany

     KIT                                                        CEA



The Frédéric Joliot / Otto Hahn Summer School pursues two objectives: On the one hand it addresses the needs and challenges of nuclear systems -- Reactor and fuel design and operation, evolutionary and innovative concepts, optimal solutions for the back-end of the fuel cycle, etc. On the other hand, the School aims at keeping scientists and engineers abreast of the latest developments in basic and applied nuclear sciences, so as to preserve the high standard of knowledge in reactor physics and reactor technology.

This international course is intended for junior as well as experienced scientists and engineers in R&D laboratories, nuclear industry and utilities. Postdocs are also encouraged to apply.

Lecturers are invited from internationally leading universities and industry. The School format encourages informal discussions and the exchange of knowledge between lecturers and participants.

The Frédéric Joliot / Otto Hahn Summer School is a continuation of the Frédéric Joliot Summer School founded by the Commissariat à l´Énergie Atomique in 1995 to promote knowledge in the field of reactor physics in Cadarache, France.

The Frédéric Joliot / Otto Hahn Summer School is jointly organized by the Nuclear Energy Division of the Commissariat à l´Énergie Atomique (CEA/DEN, France) and the Karlsruhe Institute of Technology (Germany).


The 21st session of the Frédéric Joliot/Otto Hahn (FJOH) Summer School on “Nuclear Reactors Physics, Fuels, and Systems” will be held in Karlsruhe, Germany, from August 19 to August 28, 2015. This session is entitled Enhanced Reactor Safety – Design and Simulation of LWR Evolutionary Cores. It is an advanced course aimed at junior as well as experienced scientists and engineers engaged in the broad field of nuclear sciences, engineering and technologies.

The FJOH-2015 programme covers the following three topics: (i) Core Physics and Safety; (ii) Thermo-hydraulics and Multi-physics; (iii) Clads and Fuels. The overall course will focus on current as well as evolutionary LWR reactors and fuels. The various lectures will illustrate how advances in reactor physics and safety, thermal hydraulics, materials, fuels, and multi-physics modelling can help achieve more robust core behaviour in accidental situations, while preserving performance in normal operation. Basic physics phenomena, state-of-the-art methods and modelling techniques will be described, as well as validation experiments. A dedicated seminar will address licensing aspects and ecomonics issues. The FJOH-2015 objective is to help the school participants develop a good understanding of the requirements and R&D challenges implied by the search for increased accident-tolerant LWRs.

FJOH-2015 includes plenary lectures, group discussions, seminars, and technical visits. Speakers are invited from internationally leading universities, research and development laboratories, and industry. The lectures are at a post-doctoral level.

The FJOH-2015 participants will have the opportunity to share their views on specific cross-cutting subjects and open-ended questions, as part of group reflection and critical thinking activities. Time has been set aside in the school schedule for these activities.

This course represents the continuation of the Frédéric Joliot Summer Schools on «Modern Reactor Physics and the Modelling of Complex Systems», which was created by CEA in 1995 to promote knowledge in the field of reactor physics, in a broad sense, and the international exchange of teachers, scientists, engineers and researchers. Beginning in 2004, the scope of the School was extended to include scientific issues related to nuclear fuels. The venues of the FJOH School sessions alternate between Karlsruhe and Aix-en-Provence.

The School’s aim is to address the challenges of reactor design and optimal fuel cycles, and to broaden the understanding of theory and experiments.

The programme of each School session is defined by the International FJOH Scientific Board (see below).

The Karlsruhe Institute of Technology and the Nuclear Energy Division of CEA jointly organize and sponsor the FJOH Summer School.

Programme Outline

1. Introduction                                                                                                                                                         2 h

           Motivation for Enhanced-safety LWRs, and Implications                      C. Laville (IRSN)


2. Core Physics and Safety                                                                                                                                      10 h

2.1.   State-of-the-art Fuel Inventory and Decay Heat Simulation,
       Uncertainty Assessment (4 h)                                                           R. Mills (NNL)

2.2     LWR Core-design Trade-offs for Built-in Enhanced Accident

           Tolerance (4 h)                                                                              J. Gehin (ORNL)

2.3     Robust In-core Instrumentation for Improved Core Performance

           and Control (2 h)                                                                           A. Lyoussi (CEA)


3. Thermo-hydraulics and Multi-physics                                                                                                                 8 h

3.1     Evolutionary LWR Designs -- Progress in Simulation for Multi-physics

           Analyses and DBA Assessment (4 h)                                                V. Sánchez-Espinoza (KIT)

3.2     Validation Experiments & Instrumentation, Demonstrations (2 h + 2 h)

                                                                                                   H. Schmidt (AREVA) and S. Kliem (HZDR)


4. Clad and Fuels: From Current Designs to Innovative Concepts                                                                           12 h

4.1     Requirements for Accident-tolerant Fuel and Clad Properties:
a) From the Basic Phenomenology to Candidate Fuels, Clads and
    Core Components (4 h)                                                              S. Bragg-Sitton (INL)

            b) From Candidate Concepts to the TRL=9 Level (2 h)                       Y.-H. Koo (KAERI)

4.2   Detailed Modelling and Databases of LWR-fuel Degradation
in Severe Accident Conditions (2 h)                                                 M. Kurata (JAEA)

4.3   Modelling and Simulation: Where do we Stand? Gaps, Testing,
and Experimental Validation (2 h + 2 h)                                           M. Steinbrück (KIT) and B. Michel (CEA)


Group Reflection on Selected Scientific Topics                                                                                                  6 h

                 Organization, Group Assignments (1 h)                                            FJOH Staff

                 Parallel Group Work (3 h)                                                               Groups

                 Synthesis (2 h)                                                                              Groups


     Seminar                                                                                                                                                                2 h

                 Licensing Aspects of Plant Evolution vs. Economics and Performance Issues
                                                                                                                     M. Moatti (EdF)



    Technical visits of Karlsruhe Institute of Technology R&D facilities



 Content   File   Format   Size 
 First Announcement  Pre-Announcement.pdf  pdf  118KB
 Leaflet  FJOH-2015_Leaflet
 pdf  793KB
 Poster  FJOH-2015_Poster
 pdf  879KB