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A reactor vessel head for a pressurized water reactor. This structure is attached to the top of the reactor vessel body. It contains penetrations to allow the control rod driving mechanism to attach to the control rods in the fuel assembly. The coolant level measurement probe also enters the vessel through the reactor vessel head.
Computer generated view of an EPR power station Reactor pressure vessel of the EPR. The EPR is a Generation III+ pressurised water reactor design. It has been designed and developed mainly by Framatome (part of Areva between 2001 and 2017) and Électricité de France (EDF) in France, and by Siemens in Germany. [1]
The reactor pressure vessel is manufactured from ductile steel but, as the plant is operated, neutron flux from the reactor causes this steel to become less ductile. Eventually the ductility of the steel will reach limits determined by the applicable boiler and pressure vessel standards, and the pressure vessel must be repaired or replaced.
Jet pumps internal to the reactor vessel provide 2/3rds of the recirculation flow, allowing the external recirculation flow loop to be small and compact compared to contemporary PWR designs. Under loss of coolant jet pumps provide 10% power similar to boilers.
The ECCS is designed to rapidly flood the reactor pressure vessel, spray water on the core itself, and sufficiently cool the reactor fuel in this event. However, like any system, the ECCS has limits, in this case, to its cooling capacity, and there is a possibility that fuel could be designed that produces so much decay heat that the ECCS would ...
IMSR Core-unit, primary containment and silo. This cut-away view shows the internals of the IMSR Core-unit, the containment and the surrounding structural silo. The Core-unit is a sealed reactor vessel that contains the graphite moderator (shown in white), primary fuel salt, and primary heat exchangers and pumps (shown in blue).
It houses the vessel of the reactor, which is annular, made of an inner and outer cylindrical wall and top and bottom metal plates that cover the space between the inner and outer walls, without covering the space surrounded by the vessel. The reactor vessel is an annular steel cylinder with hollow walls and pressurized with nitrogen gas, with ...
The addition of reactor internal pumps (RIP) mounted on the bottom of the reactor pressure vessel (RPV) – 10 in total – which achieve improved performance while eliminating large recirculation pumps in containment and associated large-diameter and complex piping interfaces with the RPV (e.g. the recirculation loop found in earlier BWR ...