SMRs & ADVANCED REACTORS | RITM-200N CRDM
removal system from containment
HX of heat
SG cassette
MCP
Reactor
Primary circuit systems
Shield tank
Core
Above left, figure 1: Graphic showing the integrated design of the RITM-200N reactor Above right, figure 2: Graphic of the RITM-200N plant shown in a steel containment shell
leg of each loop. Each loop consists of three cassettes
(twelve in total) with separate feed water manifolds and a common steam manifold. The configuration of the cassettes make it possible to install them inside the reactor vessel for a compact design. Sensors are provided to monitor the temperature of the coolant at the entrance to the core, at the exit from the core, and at the outlet of the fuel assemblies. The RITM-200 reactor core consists of low enriched (less than 20%) fuel assemblies, similar to those used in the KLT-40S, and thus meet international non-proliferation requirements. Cermet fuel consists of ceramic fuel particles of uranium dioxide (UO2
) embedded in aluminum-silicon
alloy (silumin). Compared to the KLT-40S, this core has a longer refueling cycle.
The main design features to enhance the fuel reliability
of the RITM-200N are as follows: ● High thermal conductivity decreases the temperature inside the fuel columns and reduces the probability of cracking. Cermet fuel is also more tolerant to swelling during its long retention period in the core.
● The fuel rod cladding is made of corrosion-resistant alloy. It is more resistant to corrosion in comparison with zirconium during a long fuel cycle. The same cladding alloy is used in the cores of new nuclear icebreakers and fast reactors in Russia.
● For core reactivity compensation, the control rods are based on an electromechanical reactivity control system and heterogeneous burnable poison are used. A typical soluble boron poison is not used for the
Table 1: The main design parameters of the RITM-200N Parameter
Reactor
Electrical power (Gross) Thermal power (Gross) Design life of RPV
Load follow capability
Safe Shutdown Earthquake (SSE) Type and fuel enrichment Coolant pressure, MPa Core flow, t/h
Steam temperature, °C
Feed water temperature, °C Steam pressure, MPa Steam capacity, t/h
38 | May 2024 |
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Value
RITM-200N 55 MWe
190 MWth 60 years
30-100% with power change rate of 0.1%/s 0.3g (up to 0.5g as an option) with fuel enrichment below 20% 15.7
UO2
3250 295 170
3.83 305
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