In the primary coolant pumps of nuclear reactor primary loops, bearings operate continuously at temperatures exceeding 280°C, pressures above 15MPa, and coolant flow rates of tens of thousands of cubic meters per hour, while simultaneously enduring sustained neutron and gamma radiation. In control rod drive mechanisms, bearings complete precise lifting and insertion of control rods in the reactor core's intense radiation field——every action affecting reactor power regulation precision and emergency shutdown reliability. In the manipulators and remote handling equipment of nuclear fuel reprocessing plants, bearings perform fuel assembly gripping, cutting and encapsulation in gamma radiation fields——with cumulative doses exceeding 10⁵Gy. In the transport equipment of geological nuclear waste repositories, bearings must operate for decades or even centuries without maintenance.

 

The operating environment of nuclear industry equipment bearings represents one of the most demanding industrial applications for materials science, manufacturing precision and reliability. High-dose radiation——neutron irradiation and gamma rays cause lattice damage to bearing materials, leading to embrittlement, dimensional changes and performance degradation； high temperature and high pressure——reactor coolant temperatures exceed 280°C and pressures exceed 15MPa, with bearings operating continuously in high-temperature high-pressure coolant； corrosive media——boric acid solutions, high-temperature water, nitric acid and other nuclear industry media continuously chemically attack bearing materials； ultra-long-life requirements——nuclear facilities are typically designed for 40 to 60 years of service life, with mainstream nuclear-grade bearings designed for ≥40 years, and bearings must maintain zero-failure reliability throughout the entire service period. A single nuclear industry bearing failure can mean reactor emergency shutdown, nuclear fuel processing interruption, radioactive material leakage, or even a severe nuclear safety incident.

 

Japan NMT nuclear industry equipment bearings are specialized product series developed specifically for the nuclear industry's extreme requirements for radiation resistance, high-temperature tolerance, ultra-long life and zero-failure reliability. NMT nuclear industry equipment bearings feature systematic specialized optimization in radiation-resistant materials, high-temperature stability, corrosion protection and ultra-long-life design——ensuring absolutely reliable rotational and transmission support under the extreme conditions of reactor coolant pumps, control rod drive mechanisms, nuclear fuel handling equipment, nuclear waste treatment systems and nuclear facility decommissioning equipment.

 

NMT nuclear industry equipment bearings precisely address the core positions of various nuclear facility equipment. Nuclear reactor primary coolant pump bearings utilize radiation-resistant high-temperature self-lubricating bearings or ceramic bearings, maintaining dimensional stability, radiation damage resistance and low-friction operation in high-temperature high-pressure coolant and neutron/gamma radiation environments exceeding 280°C. Bearing designs must ensure long life with negligible wear to maintain accurate alignment and smooth long-term operation. As the only rotating equipment in the reactor primary loop——a pressure boundary Class 1 component subject to high temperature, high pressure and nuclear irradiation——NMT bearings withstand high-velocity coolant flow and high-speed pump shaft rotation, ensuring long-term stable reactor cooling system operation. Nuclear reactor control rod drive mechanism bearings utilize radiation-resistant precision bearings or plain bearings, withstanding sustained radiation and high temperature in reactor core irradiation environments, maintaining precise control rod lifting, insertion and positioning, ensuring reactor power regulation and emergency shutdown reliability.

 

Nuclear fuel reprocessing plant manipulator and remote handling equipment bearings utilize radiation-resistant stainless steel bearings or full ceramic bearings, withstanding high-dose irradiation (cumulative doses exceeding 10⁵Gy) and corrosive nitric acid media in gamma radiation fields. NMT full ceramic bearings with solid lubrication solutions completely eliminate organic lubricant carbonization failure in radiation fields, validated in multiple hot-cell manipulators under actual operating conditions. Bearings maintain precise manipulator joint action and flexible operation, ensuring safe remote operation with operators远离 high-radiation areas. Nuclear fuel shearing and dissolution equipment bearings utilize radiation-resistant corrosion-resistant bearings, withstanding radiation, high temperature and nitric acid corrosion during radioactive fuel assembly shearing and dissolution, maintaining precise shearing tool action and stable dissolver agitation, ensuring nuclear fuel reprocessing process continuity.

 

Nuclear waste vitrification and packaging equipment bearings utilize radiation-resistant high-temperature bearings, withstanding high temperatures (exceeding 1000°C) and intense radiation during high-level liquid waste vitrification, maintaining precise agitator and pouring system action, ensuring stable radionuclide immobilization and safe packaging. Nuclear waste geological repository transport and sealing equipment bearings utilize corrosion-resistant ultra-long-life bearings, withstanding groundwater corrosion and sustained pressure in deep geological environments, maintaining reliable transport equipment operation and long-term sealing system integrity, ensuring long-term safe nuclear waste isolation.

 

Nuclear research reactor and accelerator equipment bearings utilize radiation-resistant high-precision bearings, maintaining precise positioning and low-friction operation in high-radiation environments of reactor beam ports and accelerator target stations, withstanding alternating radiation and vacuum conditions, ensuring precise control of nuclear physics experiments and isotope production. Nuclear facility decommissioning and decontamination equipment bearings utilize radiation-resistant corrosion-resistant bearings, withstanding the dual attack of radiation and chemical decontaminants in high-radiation environments, maintaining precise robotic arm and cutting equipment operation, ensuring safe nuclear facility decommissioning and site remediation reliability.

 

NMT nuclear industry equipment bearings utilize radiation-resistant stainless steel, silicon nitride ceramic, silicon carbide ceramic or special alloy materials, with customized material selection based on radiation dose, temperature, media and life requirements of nuclear facility equipment. Hybrid ceramic bearings offer advantages in radiation resistance and self-lubrication, making them the mainstream choice for next-generation reactor designs. Radiation-resistant stainless steel undergoes special alloying treatment to maintain intergranular corrosion resistance and radiation embrittlement resistance in irradiation environments； silicon nitride and silicon carbide ceramics offer excellent radiation damage resistance, high hardness, low thermal expansion coefficient and chemical inertness, making them ideal materials for nuclear industry bearings. Rolling elements and raceways undergo precision machining and superfinishing to maintain low-friction operation in nuclear industry media. Bearings utilize solid lubricant coatings (MoS₂, DLC, etc.) or self-lubricating designs to maintain reliable lubrication in nuclear industry high-temperature high-pressure water and irradiation environments. Solid lubricants offer high-temperature resistance, wear resistance and low friction, avoiding decomposition and volatilization of conventional greases under irradiation.

 

Sealing and protection undergo specialized optimization for nuclear industry conditions. NMT nuclear industry equipment bearings employ metal bellows seals or all-metal sealing solutions, maintaining reliable sealing performance in high-temperature high-pressure coolant and radioactive media, effectively preventing radioactive material leakage. Bearings undergo specialized vacuum degassing and surface passivation treatment to maintain low corrosion rates and long life in nuclear industry environments. All NMT nuclear bearings undergo rigorous irradiation stability validation, high-temperature high-pressure media resistance testing and ultra-long-life durability validation.

 

Reasons for selecting NMT nuclear industry equipment bearings：

 

Radiation-resistant stainless steel, silicon nitride ceramic, silicon carbide ceramic or special alloy materials resist neutron irradiation and gamma radiation damage

 

Special alloying treatment resists radiation embrittlement and intergranular corrosion

 

Solid lubricant coatings (MoS₂/DLC) or self-lubricating designs avoid grease decomposition/volatilization under irradiation

 

Ceramic materials with low thermal expansion, high hardness and chemical inertness maintain dimensional stability in high-temperature high-pressure coolant

 

Full ceramic bearings + solid lubrication validated in high-radiation high-corrosion hot-cell manipulators under actual operating conditions

 

Metal bellows or all-metal seals prevent radioactive material leakage

 

Ultra-long-life design meets nuclear facility 40 to 60-year design life requirements

 

Zero-failure reliability design validated through rigorous irradiation, high-temperature, high-pressure and corrosion durability testing

 

Customized material solutions precisely matched to radiation dose, temperature and media

 

Suitable for reactor coolant pumps, control rod drive mechanisms, nuclear fuel reprocessing manipulators, nuclear waste treatment equipment, nuclear research installations and nuclear facility decommissioning equipment

 

These performance advantages establish NMT nuclear industry equipment bearings as the reliable precision components for nuclear reactor coolant pumps, control rod drive mechanisms, nuclear fuel reprocessing equipment, nuclear waste treatment systems, nuclear research installations and various nuclear facility core assemblies.

 

Application scenarios

 

Nuclear reactor primary coolant pump bearings

 

Nuclear reactor control rod drive mechanism bearings

 

Nuclear fuel reprocessing plant manipulator and remote handling equipment bearings

 

Nuclear fuel shearing and dissolution equipment bearings

 

Nuclear waste vitrification and packaging equipment bearings

 

Nuclear waste geological repository transport and sealing equipment bearings

 

Nuclear research reactor and accelerator equipment bearings

 

Nuclear facility decommissioning and decontamination equipment bearings

 

Precision manufacturing

 

Produced according to nuclear industry quality assurance standards and nuclear-grade bearing manufacturing specifications (including ASME N-stamp nuclear certification)， NMT nuclear industry equipment bearings utilize radiation-resistant stainless steel, silicon nitride ceramic, silicon carbide ceramic or special alloy materials, processed through vacuum melting, hot isostatic pressing sintering, precision machining, nanometer-level superfinishing, solid lubricant coating deposition, metal bellows or all-metal seal precision assembly, vacuum degassing treatment, rotational accuracy inspection, irradiation stability validation， high-temperature high-pressure media resistance testing and ultra-long-life durability validation——ensuring every product delivers radiation resistance, high-temperature tolerance, ultra-long life and zero-failure reliability.

 

Product range

 

Reactor coolant pump radiation-resistant self-lubricating bearings

 

Reactor coolant pump ceramic bearings

 

Control rod drive mechanism radiation-resistant precision bearings

 

Nuclear fuel reprocessing manipulator radiation-resistant spherical plain bearings

 

Nuclear fuel shearing equipment corrosion-resistant bearings

 

Nuclear waste vitrification high-temperature ceramic bearings

 

Nuclear waste repository ultra-long-life bearings

 

Nuclear research accelerator radiation-resistant high-precision bearings

 

Nuclear facility decommissioning radiation-resistant corrosion-resistant bearings

 

Custom non-standard nuclear industry equipment bearings

 

Global industrial service

 

Japan NMT supplies high-quality nuclear industry equipment bearings to global nuclear power operators, nuclear fuel cycle companies, nuclear facility design and engineering firms, nuclear research institutions and nuclear facility decommissioning service providers, empowering safe nuclear energy utilization and sustainable nuclear industry development with radiation-resistant high-temperature ultra-long-life precision engineering and zero-failure nuclear-grade reliability.