JASMiRT Workshop: Towards Innovative Systems Performance and Safety of Nuclear Power Plants under Extreme Events

Coordinators: Professor Tsuyoshi Takada (University of Tokyo) and Hiroshi Abe (Atomic Energy Society of Japan - AESJ)

Date: Thursday, August 8, 2019

Time: 10:15 a.m. - 5:15 p.m.

Japan has the responsibility to inform the world, especially countries promoting Nuclear Power, many lessons learned from the Fukushima Daiichi accident due to extreme external events, the major tsunami caused by extreme earthquake, and from subsequent studies on the mitigation of beyond design basis events. Innovative approaches to material mechanics and structural analysis, with active application of the high performance computing, are being developed for the design and decommissioning processes to address the following post-accident challenges.

-Protection against external events                                  

-Mitigation of beyond-design basis event

-Secure decommissioning under extreme high radiation circumstance    

-Strong and effective regulatory infrastructure

In the workshop, cutting-edge knowledge worldwide on these areas are shared and future agenda to be resolved through SMiRTs hereafter are picked up and discussed.

Session 1: Evolution of Design Process Towards Innovative Systems Performance and Reactor Safety

Date: Thursday, 8th August

Time: 10:15 a.m. – 12:00 p.m.

Room: Grand Ballroom B

Chair: Naoto Sekimura (Univ. of Tokyo), Co-Chair: Prof.Tsuyoshi Takada (The University of Tokyo)

Opening Speech: Tsuyoshi Takada (The University of Tokyo)


1) IAEA perspectives on safety design of nuclear power plants after Fuku shima Daiichi accident
Greg Rzentkowski (IAEA)

2) Framework to continue safety enhancement in Japan taking consideration of experiences after Fukushima accident
Naoto Sekimura (The University of Tokyo)

3) Recent developments for seismic SSI analysis of nuclear structures and challenges for beyond design assessment
Farhan Ostadan (Bechtel)

4) An overview about European regulatory framework for DB and BDB external natural hazards
Emmanuel Viallet (EDF)


Session 2. Actual System Failure Sequences and Mechanisms Under Extreme Loadings

Date: Thursday, 8th August

Time: 1:15 p.m. – 3:00 p.m.

Room: Grand Ballroom B

Chair: Naoto Kasahara (The University of Tokyo)

Opening Speech:

Necessity of different structural approaches for BDBE from DBE
Naoto Kasahara (The University of Tokyo)


1) Canadian Guidelines on BDBAs
Andrei Blahoianu (CNSC, Canada)

2) New trends in the seismic design of pressurized piping under the Beyond Design Basis Earthquake 
Alexey Berkovski(Russia)

3) The Design of SC Wall Shielding System Boundary for AP / CAP Reactor
Ziduan Shang (SNERDI, China)

4) Needs of actual failure evaluation for safety improvement
Kazutoshi Eto (Kyushu EPCO, Japan)

Future Agenda for Safety Improvement


Session 3. Seismic Response Analysis for Beyond-Design-Basis Events

Date: Thursday, 8th August

Time: 3:30 p.m. – 5:15 p.m.

Room: Grand Ballroom B

Chair: Muneo Hori (JAMSTEC, Japan)

Opening Speech:

Utilization of high performance computing in seismic response analysis and active fault analysis
Muneo Hori (JAMSTEC, Japan)


1) Nuclear installation lifecycle: modeling and simulation of design basis and beyond design basis earthquake soil structure interaction behavior
Boris Jeremic (UC Davis, USA)

2) Efficient methods and parallel algorithms for coupled simulations in the framework of nuclear safety
Vincent Faucher (CEA, France)

3) The anti impact capacity analysis of the CFRP and composite armors
Meng Chu (SNERDI, China)

4) Reliability enhancement of seismic risk assessment of NPP: Study on standardization of seismic response analysis method for reactor building using three dimensional model
Akemi Nishida (JAEA)


Future agenda for the following challenges:

a) Promotion of modern computer utilization for evaluation of seismic response analysis for beyond design basis events

b) Promotion of modern computer utilization for uncertainty effects on seismic response analysis

c) Coordinated experiment and simulation of soil structure interaction effects to clarify soil structure interface conditions


Session 4. Decommissioning of Aged and Damaged Nuclear Systems

Date: Thursday, 8th August 

Time:10:15 a.m. – 12:00 p.m.

Room: Ballroom CD

Chair: Shunichi Suzuki (The University of Tokyo)

Opening Speech: 

Risk assessment for decommissioning of Fukushima Daiichi NPP
Shunichi Suzuki (The University of Tokyo)


1) Decommissioning Status at Fukushima Daiichi NPP
Keita Sato (TEPCO)

2) Responses to Safety concerns for Decommissioning of back end facilities in France
Christine Georges(CEA)

3) Experiences with Radiological and Industrial Safety during Decommissioning
Rick Reid (EPRI)


Future Agenda: Safety concerns for 1F decommissioning



Date: Thursday, 8th August

Time: 4:45 p.m. – 5:15 p.m.

Room: Grand Ballroom B