Design standards for special air handling units for nuclear power plants:
Main design criteria adopted:
RCC-M "Rules for Design and Construction of Mechanical Equipment of Nuclear Island of Pressurized Water Reactor Nuclear Power Plant"
RCC-E "Rules for Design and Construction of Electrical Equipment of Nuclear Island of Pressurized Water Reactor Nuclear Power Plant"
ASME AG-1 Nuclear Air and Gas Handling Regulations
NEMA MG-1 Motors and Generators
UL 900 UL Standard for Safety: Air Filter Units
GB/T14294-2008 "Combined Air Conditioning Unit"
GB/T 14296-2008 "Air Coolers and Heaters"
Nuclear Safety Level Standard
RCC-P3 (NNS)
Seismic category of the whole machine
Class I or II
Machine quality assurance level
QRA1
The cleanliness level of the whole machine
Class B

Main technical features:
l Mainly suitable for nuclear power plants, the air treatment process inside and outside the island
The skeleton is made of hot-dip galvanized sheet, which is bent many times, with good anti-corrosion performance and high seismic strength
The skeleton and the box body adopts the structure of preventing "cold bridge", and there is no condensation phenomenon
●Using 50mm thick box board, polyurethane high pressure foaming (50kg/m3), good thermal insulation performance and high strength
●Adopt no joint glue injection foam seal, the air leakage rate of the whole machine is less than 1.0%
●Adopt integrated bypass heating coil to improve air supply control accuracy and speed
Large-scale units are assembled on site, reducing the size of the hoisting port, and using bolts to connect without damaging the anti-corrosion layer

The main functional section of the unit:

accelerometer installation location





Qualified prototype seismic test site