Dirk C HOPP Expert and Senior Advisor PTCQA Clearwater Beach 20140512 to 14 Severe Accidents Qualification Severe Accident Qualification IEEE SC2 Dirk C HOPP 20140512 to 14 AREVA GmbH Proprietary ID: 810550
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Slide1
Slide2Severe Accident Qualification EPR™ OL3
Dirk C. HOPP
Expert and Senior Advisor / PTCQA
Clearwater Beach 2014-05-12 to 14
Slide3Severe Accidents Qualification
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 (SA) are considered by Design for EPR™
Slide4Severe 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
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
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 areasHigher temperatures at concerned areas
Specific requirements are defined for respective
EPR™
Projects
Safety Analysis Report
Technical Specifications
Slide5Severe 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)
Severe Accident Qualification
– IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary –
RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.
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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 SAIndividual Mission Times may be defined (e.g. 24 h for Intermediate Excore Neutron Detectors)
Slide6Severe 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 limitsMay be material tests (e.g. long-term 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
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)
Slide7Severe Accidents Qualification
Parts of the Qualification (2/4)
Type Tests in accordance to Nuclear Standards
Functional tests at postulated conditionsQualified life testsSA simulation tests, including simulation of the Post Accident Phase
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
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)
Slide8Severe Accidents Qualification
Parts of the Qualification (3/4)
Pre-Conditioning
Loads due to transportationThermal ageingRadiation ageing Mechanical ageing Load cycles representing start-up and shut-downLoads 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.
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Slide9Severe 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)
Severe Accident Qualification
– IEEE SC2 – Dirk C. HOPP – 2014-05-12 to 14 - AREVA GmbH Proprietary –
RESTRICTED AREVA - © AREVA - AL: N - ECCN: N - p.
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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)
Slide10Severe Accidents Qualification
Summary
Severe Accidents
are considered by Design for EPR™ EPR™ handles Severe Accidents identical/similar to Design Basis EventsQualification Steps depends on the Mission TimesIn general Design Tests and Type Tests according to Product Standards are preconditions before starting Nuclear QualificationSevere 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.
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Slide11Editor 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.
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Slide12End of presentation
Severe Accident Qualification
Dirk C. HOPP
Expert and Senior Advisor / PTCQA Clearwater Beach 2014-05-12 to 14