Nuclear Power Applications
Q1: What nuclear standards apply to Q355B components?
A1: Nuclear-specific requirements:
ASME III: Nuclear component construction
RCC-M: French nuclear code
10CFR50: US NRC requirements
Additional requirements: Enhanced NDE
Material traceability: Strict documentation
Q2: How does irradiation affect Q355B properties?
A2: Radiation effects:
Embrittlement: Shift in ductile-brittle transition
Hardening: Yield strength increase
Swelling: At very high doses
Testing requirements: Irradiated material tests
Design considerations: Operating limits
Q3: What special welding requirements exist?
A3: Nuclear welding standards:
ASME IX: Additional requirements
Weld overlay: For corrosion resistance
Butter welding: Dissimilar metal joints
PWHT control: Strict temperature monitoring
NDE extent: 100% volumetric examination
Q4: How are nuclear components inspected?
A4: Inspection program:
VT-1/2/3: Visual examination levels
UT qualification: SNT-TC-1A requirements
RT techniques: Special nuclear methods
In-service inspection: ISI programs
Underwater examination: For reactor vessels
Q5: What are decommissioning considerations?
A5: End-of-life factors:
Activation analysis: For disposal planning
Cutting techniques: Minimize contamination
Waste classification: By radioactivity level
Recycling potential: Clearance measurements
Cost estimation: Specialized demolition plans
