Nuclear Fans
Axial Flow Fans
Centrifugal Fans
ATEX Fans
Custom Built Fans
Seismic Fans
Specialist Applications
Our
Capabilities
Certified Nuclear Excellence Since 1976
WITT UK Group stands as one of the few manufacturers globally qualified to supply ventilation systems for nuclear applications, with proven installations in over 58 nuclear power plants worldwide. Our nuclear division maintains the prestigious KTA 1401 certification for quality assurance in nuclear facilities, alongside specialised authorisations including W 180.11/1-RS under §15 of the Radiation Protection Ordinance. This unique combination of certifications enables us to design, manufacture, install, and service fans within active nuclear environments—from reactor containment buildings to spent fuel storage facilities, from research reactors to reprocessing plants. Every nuclear fan undergoes exhaustive qualification including seismic analysis, radiation resistance testing, and gas-tightness verification to ensure absolute reliability in safety-critical applications.
Engineered for Extreme Reliability
Nuclear ventilation demands zero-failure performance under extreme conditions including radiation exposure, seismic events, loss-of-coolant accidents (LOCA), and station blackout scenarios. Our nuclear-grade fans incorporate specialised features including Class 1E electrical components for safety systems, decontaminable surfaces for radiation zones, gas-tight construction preventing radioactive release, and seismic qualification to IEEE 344 and European standards. With design lives extending to 60 years and beyond, these systems undergo rigorous analysis including finite element modelling for structural integrity, environmental qualification for harsh conditions, and full-scale seismic testing on shake tables. Our in-house nuclear specialists manage the complete documentation package required for regulatory approval, including design basis documents, safety case submissions, and equipment qualification records.
- KTA 1401, ASME N-stamp, and RCC-M qualification for nuclear quality assurance
- Seismic qualification to SL-2 levels including shake table testing
- Environmental qualification for radiation doses up to 10⁸ Gy
- Gas-tight designs tested to DIN 25412 preventing radioactive release
- Decontaminable construction with specialist coatings for hot zones
- Design lives of 40-60 years with qualified maintenance programmes
Why Choose
Nuclear Fans
NUCLEAR QUALIFIED
Four decades of nuclear experience with KTA 1401 certification and authorised radiation workers for on-site service.
SEISMIC
PROVEN
Full seismic qualification including analysis, testing, and certification for SL-1 and SL-2 earthquake conditions.
LIFETIME
SUPPORT
60-year design life with comprehensive spares availability and qualified maintenance programmes throughout plant lifetime.
Frequently
Asked Questions
What makes nuclear fans different from standard industrial fans?
Nuclear fans must meet extraordinary reliability and safety requirements not found in conventional applications. They require nuclear-grade materials with certified traceability, qualification for radiation exposure and ageing, seismic certification for continued operation during earthquakes, gas-tight construction preventing radioactive release, decontaminable surfaces for maintenance in contaminated areas, and Class 1E components for safety systems. Additionally, the documentation requirements are extensive, with every component tracked from raw material through decades of operation.
Which nuclear standards and certifications does WITT maintain?
We maintain KTA 1401 certification (German nuclear quality standard), authorisation under Radiation Protection Ordinance §15, compliance with RCC-M (French nuclear design code), familiarity with ASME Section III requirements, IEEE 344 seismic qualification capability, and ISO 9001:2015 with nuclear extensions. Our quality system covers design, manufacture, testing, installation, and through-life support. We’re approved suppliers to major nuclear operators including EDF, RWE, E.ON, and Vattenfall.
Can nuclear fans operate during accident conditions?
Yes, our safety-related nuclear fans are qualified for Design Basis Accident (DBA) conditions including Loss-of-Coolant Accident (LOCA) with high temperature and humidity, station blackout with battery backup operation, seismic events up to Safe Shutdown Earthquake (SSE) levels, and post-accident radiation environments. Fans undergo environmental qualification testing simulating accident conditions, demonstrating continued operation at 100% humidity, temperatures to 200°C, and radiation doses exceeding 10⁶ Gy.
How is seismic qualification achieved?
Seismic qualification follows a rigorous multi-stage process: seismic analysis using finite element methods, comparison against required response spectra (RRS), shake table testing of full-scale units or scaled models, demonstration of structural integrity and operational continuity, and comprehensive test reports for regulatory submission. We qualify fans for both Operating Basis Earthquake (OBE) and Safe Shutdown Earthquake (SSE) levels, ensuring continued operation during and after seismic events.
What documentation is provided for nuclear projects?
Nuclear projects receive comprehensive documentation packages including: design basis documents and calculations, material certificates with full traceability, manufacturing and test records, seismic and environmental qualification reports, operation and maintenance manuals, spare parts recommendations for 60-year life, decommissioning data for end-of-life planning, and configuration management throughout plant lifetime. All documentation meets regulatory requirements for safety case submissions and periodic safety reviews.
Can WITT service fans in radioactive areas?
Yes, our nuclear service division includes radiation-qualified workers authorised under §15 of the Radiation Protection Ordinance. We provide: planned maintenance during outages, emergency response for critical systems, remote inspection using specialised equipment, decontamination and refurbishment services, modification and upgrade programmes, and radiation dose planning and ALARA compliance. Our technicians maintain radiation passports and follow strict contamination control procedures, ensuring safe, efficient maintenance within controlled areas.