Aller au menu Aller au contenu

Pressure vessels and internals

A+Augmenter la taille du texteA-Réduire la taille du texteImprimer le documentEnvoyer cette page par mail Partagez cet article Facebook Twitter Linked In Google+ Viadeo
  • Responsables : EDF R&D Les Renardières
Contenu

Function, Design requirements, operating conditions for vessels and internals in PWR . Comparison with BWR and VVER. Materials under use.-> done in module B


Vessel, Vessel head and pressurizer :

Reasons for the choice for the materials : Dimensioning and fabrication, Corrosion resistance, welding, control. -> done in module B

Comparison with international practice, construction rules in France (RCCM) and abroad

Fabrication of the vessel : casting, forging, welding, cladding. Fabrication defects and control

Dimensioning, structural integrity, risks of fast fracture, safety margins for various situations, regulations and international practice

Operating conditions : calculation of temperatures and neutron flux.

Ageing of materials for the vessel and pressurizer -> general mechanism of thermal ageing will be introduced in P1 and irradiation hardening and embrittlement in C1 and C2

Thermal ageing : segregation, intergranular damage

Ageing under irradiation

Surveillance program

Prediction of microstructural evolution

Formulaes for hardening and Brittle-Ductile Transition Temperature: empirical, semi-empirical, and multi-scale modeling : RPV-2 -> principles and examples will be given in C2

Formulae for toughness prediction: RCCM, master curves, local approach, advanced methods : toughness module -> principles and examples will be given in C2

Feedback from plants : On site non destructive testing -> treated in detail in D4, surveillance program, decennial hydrostatic test

Specific issues for vessel heads penetrators: stress corrosion cracking. -> Basic understanding of SCC will be introduced in P1

Demonstrations of RPV-2 and Toughness Modules


Internals  :

a. Reasons for the choice for the materials : Dimensioning and fabrication, Corrosion resistance, welding, control. -> in B

b. Fabrication

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 module C2

R and D program for predicting internals degradation, comparison with the strategy for vessels

International Practice for maintenance, repair and replacement.


Example of design evolution : internals for EPR in relation with vessel irradiation and fuel management




A+Augmenter la taille du texteA-Réduire la taille du texteImprimer le documentEnvoyer cette page par mail Partagez cet article Facebook Twitter Linked In Google+ Viadeo

mise à jour le 21 mai 2010

Grenoble INP Institut d'ingénierie Univ. Grenoble Alpes