Informations générales
Responsable(s)
Jean-Paul Massoud, EDF R&D, Chef du groupe métallurgie
Contenu(s)
D1. Fuel, Cladding and rod cluster control assembly( 10h) :
- Fuel and cladding:
- Fuel :
- Function, fabrication, choice
- MOX
- temperature and irradiation effects
- Cladding
- Elaboration, fabrication
- Cladding under irradiation : phase stability, growth, resistance, irradiation creep
- hydridation
- Pallet Cladding interaction
- Iodine stress corrosion craking (I-SCC)
- possible solutions
- Safety aspects in fuel issues : Storage, transportation, feedback from plants, cracks...
- Control rod Assembly
- Description and operation
- Control rod Drive Mechanism
- Neutrons absorbers
- Silver Indium Cadnium
- Boron Carbides
- Massive stainless steels
- Desing and production, feedback from plants, wear, cracks
- Vessel, Vessel head and pressuriser
- Comparision with international practice, construction rules in France and abroad
- Fabrication of the vessel :casting, forging, welding, defects and control
- Dimensioning, structural integrity, risks of fast fracture, safety margins for various situations, regulations and international practice
- Operating conditions : calculation of temperature neutron flux
- Ageing of materials for vessel and pressuriser (General mechanism of thermal ageing will be introduced in module P and irradiation hardening and embrittlement in C1 and C2)
- thermal ageing : segregation, intergrenular damage
- ageing under irradiation : surveillance program, prediction of microstructural evolution
- Formulae for hardening and Brittle-Ductile Transition Temperature : empirical, semi-empirical and multi-scle modelling : RPV2 module
- Formulae for toughness prediction : RCCM, master curves, local approach, advanced methods
- Feedback from plants : surveillance program, decennal hydrostatic tests, on site non destructive tests : will be treated in detail in NDT module
- Specific issues for vessel heads penetrators : stress corrosion cracking (fundamentals of SCC will be introduced in P1)
- Demonstration of RPV2 and Thoughness modules (in module C2)
- Internals
- Feedback from plants : bolts cracking
- Irradiation effects : Dimensional stability, creep irradiation and possible swelling, materials hardening, microstructural evolution
- Irradiation Assisted Stress Corrosion Cracking -> mechanisms of IASCC will be introduced in C2
- R &D program for predicting internals degradation, comparison with the strategy for vessels.
- International Practice for maintenance, repair and replacement.
- Function, Design requirements, operating conditions for circuits and exchangers, primary , auxiliary and secondary circuits environment in PWR . Comparison with BWR and VVER. Materials under use.
- Steam Generator :
- Feed back from plants, cracking of tubes, expertises
- Stress Corrosion Cracking (primary environnement)
- mechanisms introduced in P1
- Operating conditions effects
- mitigations evolutions
- replacement
- Secondary cooloanf circuits
- Description and operatinf conditions
- feed back from plants
- corrosion errosion of low alloyed steels
- steam generators : fouling and clugging
- condensers
- Fundamentals of Water chemistry
- Dissolution of gases in water
- Dissolution and precipitation of solid phases. Solubility limits.
- Water dissociation, pH
- Aqueous speciation, complexation
- Oxidation/Reduction
- Reaction kinetics
- Non ideal behaviour - boiling/bubble point elevation=
Water/oxide interface - surface charge, sorption
- Water chemistry at high temperature
- Density
- Dielectric constant
- Solvation proprieties
- chemistry of the primary circuit
- polymers under irradiation
- water radiolysis and polymers ageing
- electrical cables
- coating and paints
- ion exchange resin
- miscellaneous : other cases of studyDissolution of gases in water
- Polymers under irradiation
- water radiolysis and polymers ageing
- electrical cables
- coating and paints
- ion exchange resin
- miscellaneous : other cases of study
Bibliographie
The specific bibliography will be given at the beginning of each course