Butterfly Valves for Nuclear Power Plants
ASME Section III Class 2/3 gate, globe, and check valves with N-stamp traceability for nuclear power plant balance-of-plant, auxiliary, and spent-fuel cooling systems.
Which butterfly valves are used for nuclear power plants?
Nuclear power plants demand the most stringent valve qualification programme in any industry - ASME Section III Class 1/2/3 design and fabrication rules, N-stamp third-party oversight, seismic qualification to IEEE 344, and MOV actuator qualification to IEEE 382. Vajra Industrial Solutions supplies ASME Section III Class 2 and Class 3 valves for balance-of-plant (BOP) systems - auxiliary cooling, spent fuel pool cooling, condensate, feedwater, and service water - with complete QA/QC documentation traceable to 10 CFR 50 Appendix B in international projects and AERB guidelines in India.
Butterfly Valve
Large-bore isolation on service water, component cooling water, and turbine building HVAC
Critical Requirements
- ASME Section III Class 2/3 design: complete material traceability (Certified Material Test Reports - CMTRs) for all pressure-boundary components
- N-stamp or NA-stamp: third-party ASME Nuclear Inspector oversight for Class 2 and above
- Seismic qualification per IEEE 344 - valves on safety-related systems must withstand Operating Basis Earthquake (OBE) and Safe Shutdown Earthquake (SSE)
- Motor-operated valves (MOVs) qualified per IEEE 382 - torque, voltage variation, and harsh-environment performance testing
- QA programme per 10 CFR 50 Appendix B (USA) or AERB Safety Guide (India) - design control, procurement document control, inspection, and test records
- No substitution of materials without NCR (Non-Conformance Report) and AERB/NRC approval - traceability is mandatory
Service Challenges
- Primary coolant (reactor-grade water) - ultra-low chloride (<0.1 ppm); SS316L or Alloy 600 trim to avoid stress corrosion cracking
- Borated water - boric acid corrosion; SS316 or high-alloy materials mandatory
- Heavy water (D₂O) - CANDU/PHWR reactors; no moisture absorption; all valve internals must be compatible with D₂O chemistry
- Steam and feedwater - IBR certification mandatory in India; ASME B31.1 code compliance
- Service water (raw river/sea water) - rubber-lined butterfly valves or duplex stainless for seawater
Vajra Butterfly Valves
Compact and efficient butterfly valves for large-scale flow control and isolation.
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Butterfly Valves for other applications
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