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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.
Commonly used for ASME pressure vessels, these torispherical heads have a crown radius equal to the outside diameter of the head (=), and a knuckle radius equal to 6% of the outside diameter (=). The ASME design code does not allow the knuckle radius to be any less than 6% of the outside diameter.
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 ...
Control rods often stand vertically within the core. In PWRs they are inserted from above, with the control rod drive mechanisms mounted on the reactor pressure vessel head. In BWRs, due to the necessity of a steam dryer above the core, this design requires insertion of the control rods from beneath.
Water pressure in a closed system tracks water temperature directly; as the temperature goes up, pressure goes up and vice versa. To increase the pressure in the reactor coolant system, large electric heaters in the pressurizer are turned on, raising the coolant temperature in the pressurizer and thereby raising the pressure. To decrease ...
The reactor will utilise a reactor pressure vessel made of 20MnMoNi55 steel [7] also known as “APURVA” (Advanced Purified Reactor Vessel Alloy). [4] BARC disclosed in January 2020 that a Core catcher design has been validated that can manage a 100% core melt accident.
The IRIS pressure vessel and systems contained within it. The coolant system consists of a pressurizer, Steam generators, and reactor coolant pumps (RCPs).These are all located within the reactor pressure vessel, making a very small, short loop that forms the primary coolant system, see the figure on the right for the relative locations of the components.
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 ...