Severe Accident Qualification EPR™ OL3 Dirk C. HOPP Expert and Senior Advisor / PTCQA Clearwater Beach 2014-05-12 to 14

Severe Accidents Qualification Severe Accidents (SA) are considered by Design for EPR™ Severe Accident Qualification – IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary – RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.3

Severe Accidents Qualification General Qualification Approach (1/2) Multiple failures in plant Safety Systems could lead to their complete loss. This loss of function leads to Beyond design basis accidents Significant core degradation However, EPR™ handles the SA identical/similar to the Design Basis Events like Loss of Coolant Accidents (LOCA) Comparison of Environmental Accident Conditions of SA and LOCA Quite similar P&T profiles Higher globally irradiation for SA, extremely high at concerned areas Higher temperatures at concerned areas Specific requirements are defined for respective EPR™ Projects Safety Analysis Report Technical Specifications Severe Accident Qualification – IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary – RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.4

Severe Accidents Qualification General Qualification Approach (2/2) In general, the equipment needed for the mitigation and/or monitoring of an SA can be divided into two groups: Equipment which is directly subjected to the SA conditions (inside containment) Equipment which has to tolerate consequences of the SA (outside containment) Mission times for SA in the EPR™ are defined as follows: Midterm (MT): Required function up to 100 hours after start of the SA Long term (LT): Required function up to one year after start of the SA Individual Mission Times may be defined (e.g. 24 h for Intermediate Excore Neutron Detectors) Severe Accident Qualification – IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary – RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.5

Severe Accidents Qualification Parts of the Qualification (1/4) Design Tests as Part of the Research and Development Process Validation of required Design Testing to determine design limits May be material tests (e.g. long-term endurance test) Type Tests according to Product Standards Based on the design data and/or on values required by Product Standards May be performed on different sets of specimens Testing according to Product Standards (if applicable) Testing of the behavior for transportation Electrical functions and signal stabilities (determination of tolerances) Mechanical integrity (resistance to pressure, induced vibration loads) Material tests (endurance test) Severe Accident Qualification – IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary – RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.6

Severe Accidents Qualification Parts of the Qualification (2/4) Type Tests in accordance to Nuclear Standards Functional tests at postulated conditions Qualified life tests SA simulation tests, including simulation of the Post Accident Phase Qualified Life tests Have to be performed on the same specimens in a defined sequence representing the consequences of the loads in the life cycle of the equipment Definition of Design Life is necessary (e.g. 60 / 30 / 15 years) Severe Accident Qualification – IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary – RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.7

Severe Accidents Qualification Parts of the Qualification (3/4) Pre-Conditioning Loads due to transportation Thermal ageing Radiation ageing Mechanical ageing Load cycles representing start-up and shut-down Loads due to pressurization cycles (e.g. containment integrity tests) Vibration ageing (e.g. location of sensors/valves on high energy pipes) Severe Accident Qualification – IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary – RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.8

Severe Accidents Qualification Parts of the Qualification (4/4) Severe Accident Simulation Test Accident irradiation 1 (e.g. 800 kGy for SA Midterm 100 h; recommended dose rate is the average for the duration = 8 kGy/h) SA simulation (P&T profile) test performed in real time (for Midterm 100 h) Accident irradiation 2 (e.g. 4200 kGy total SA dose for the rest of the year; recommended dose rate is = 5 kGy/h) Post-SA test: Accelerated test with a weighted average temperature (based on activation energy value of materials); chemical spray (2500 ppm of boric acid); recommended duration 8-12 weeks (corrosion effects) Severe Accident Qualification – IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary – RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.9

Severe Accidents Qualification Summary Severe Accidents are considered by Design for EPR™ EPR™ handles Severe Accidents identical/similar to Design Basis Events Qualification Steps depends on the Mission Times In general Design Tests and Type Tests according to Product Standards are preconditions before starting Nuclear Qualification Severe Accidents Qualifications consists of almost “usual” LOCA qualification methods Severe Accident Qualification – IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary – RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.10

Editor and Copyright [2014-05-11]: AREVA GmbH – Paul-Gossen-Straße 100 – 91052 Erlangen, Germany. It is prohibited to reproduce the present publication in its entirety or partially in whatever form without prior written consent. Legal action may be taken against any infringer and/or any person breaching the aforementioned prohibitions. Subject to change without notice, errors excepted. Illustrations may differ from the original. The statements and information in this brochure are for advertising purposes only and do not constitute an offer of contract. They shall neither be construed as a guarantee of quality or durability, nor as warranties of merchantability or fitness for a particular purpose. These statements, even if they are future-orientated, are based on information that was available to us at the date of publication. Only the terms of individual contracts shall be authoritative for type, scope and characteristics of our products and services. Severe Accident Qualification – IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary – RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.11

End of presentation Severe Accident Qualification Dirk C. HOPP Expert and Senior Advisor / PTCQA Clearwater Beach 2014-05-12 to 14