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JSPM presentation
Supply and maintenance of mobile components
Mobile components are designed, manufactured, and supplied worldwide by AREVA's JSPM (Jeumont) plant. Replacement and maintenance operations for these components constitute a significant part of the Equipment business unit’s operations. The business unit has established partnerships with more than 50 international electric utilities.
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Reactor coolant pumps
Maintaining a steady output thanks to a wide choice of reliable solutions
The reactor coolant pumps are a vital for the safety and efficiency of power plants. The pump circulates coolant between the reactor and the steam generator.
First, the coolant extracts the heat from the reactor vessel. Next, outside the vessel, it transfers this heat to water in the secondary cooling system, transforming it into steam. The steam drives a turbine which produces electricity. The reliability of the reactor coolant pumps therefore guarantees and regulates operational efficiency right through the reactor coolant system.
video3D view of a Reactor Coolant Pump
The reactor coolant pumps are a vital for the safety and efficiency of power plants. The pump circulates coolant between the reactor and the steam generator.
Manufacturing
AREVA is world leader in the design of reactor coolant pumps, primary sealing systems and associated services. To date, the group has manufactured and supplied more than 400 reactor coolant pumps around the world.
The JSPM plant designs and manufactures all coolant pump components (motors, pumps, hydraulic sections, and shaft seals) and manages every aspect of their operation, from installation to servicing checks. Its three product lines include pumps for the following applications:
- Pressurized water reactors (PWR) up to a power of 1,500 MW,
- Fast neutron reactors (Phénix and Super Phénix),
- Submarine-based nuclear deterrent.
Furthermore, it is developing coolant pumps for the next generation of nuclear reactors.
Replacement
JSPM specializes in the replacement of reactor coolant pump components and provides a range of associated services.
- Modernization of components and integration of modifications
- Supplying of a wide range of replacement parts
- Fast delivery of components
- Modernization of motors on site or in the workshop
AREVA teams are fully committed to improving the reliability of power plants and reducing disruption associated with plant shutdowns. Since 1994 AREVA has successfully dismantled or fitted:
- 160 motors,
- 140 pumps and hydraulic systems.
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Control rod drive mechanisms
Neutralizing the nuclear reaction
Control rod drive mechanisms extract from, support, or insert into the reactor the control rod clusters from which the neutron absorber rods are suspended. They control staged movements of these rod clusters. Controlling the nuclear reaction requires that the absorber rods are positioned precisely and moved at the correct time.
video3D view of JSPM "Control Rod Drive Mechanism"
The control rod drive mechanism is an electromechanical component implanted over the reactor vessel head. It functions as a power and safety regulator. Its functioning and various elements in computer-generated images.
Manufacturing
A cluster drive mechanism consists of a pressurized latch housing which retains the coolant and supports the other components. Each cluster drive mechanism is assembled in a long cylinder 6.5 meters high. It is packed with different mechanism components. These include the ratchet support system which operates the control spindle, a set of magnetic coils triggering rod movements and finally the control spindle sitting in a reinforced housing.
Replacement
Since the first successful control rod drive mechanism replacements were commissioned in 1994, AREVA has safely performed more than 100 such operations.
These operations can be scheduled or performed as a matter of urgency if a leak is detected in the lower sealing zone between the mechanism housing and the vessel head adapter. Teams have received special training for working in a contaminated environment and can be mobilized quickly (72 hours in Europe, 5 days in the United States and approximately 1 week in China).
