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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.
Control rods are usually used in control rod assemblies (typically 20 rods for a commercial PWR assembly) and inserted into guide tubes within the fuel elements. 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 ...
The reactor head under inspection. Unit One is an 879 MWe pressurized water reactor supplied by Babcock & Wilcox. The reactor was shut down from 2002 until early 2004 for safety repairs and upgrades. In 2012 the reactor supplied 7101.700 GWh of electricity. [14]
- A pressurised heavy water reactor is a nuclear power reactor that uses unenriched natural uranium as nuclear fuel and heavy water as moderator and as primary coolant. The heavy water is kept under pressure in order to raise its boiling point, allowing it to be heated to higher temperatures and thereby carry more heat out of the reactor core.
Fuel stock used within the reactor is enriched uranium dioxide pellets containing gadolinium, contained in fuel rods. [2] Koeberg is rated at 1,860 MW, its average annual production is 13,668 GWh and it has two turbine generators.&. [3] [4] Each reactor delivers 970 MW (gross) and is capable of delivering 930 MW (net) to the grid. [5]
S2G reactor. USS Seawolf (SSN-575) S2W reactor. USS Nautilus (SSN-571) S2Wa reactor. replacement reactor for USS Seawolf (SSN-575) S3G reactor. land-based prototype for USS Triton (SSN-586); located at Kesselring site; S3W reactor. USS Skate (SSN-578) USS Sargo (SSN-583) USS Halibut (SSGN-587) S4G reactor. USS Triton (SSRN-586) S4W reactor
Schematic diagram of an RBMK Schematic side view of the layout of an RBMK reactor core The reactor hall and piping systems of the RBMK reactor. The reactor pit or vault is made of reinforced concrete and has dimensions 21.6m × 21.6m × 25.5m. It houses the vessel of the reactor, which is annular, made of an inner and outer cylindrical wall and ...
The Reactor Protection System (RPS) is a system, computerized in later BWR models, that is designed to automatically, rapidly, and completely shut down and make safe the Nuclear Steam Supply System (NSSS – the reactor pressure vessel, pumps, and water/steam piping within the containment) if some event occurs that could result in the reactor entering an unsafe operating condition.