Ship-based single-SMR
For smaller cities with populations from around 130,000 up to 400,000 a ship with a single SMR is deployed.
The SMR (I) is designed to operate year-round in CHP mode raising steam (II) to produce electricity via a non-condensing turbine + generator (III, IV) and using the low pressure exhaust steam to heat a district-heating water circuit (V). Any surplus heat in the form of uncondensed steam is removed by the on-board supplementary condensers (VIII) and the cooling circuit (IX) for these is cooled, in turn, by water drawn from the estuary (X). Hot condensate from the hot well (VII) is pumped (VI) back through the boiler (II) to complete the closed-loop steam circuit.
Thermo-dynamic analysis for the non-condensing steam turbine (CHP mode) - basic steam Rankine cycle
The small modular reactor's pressurised water cooling circuit operating between:
Coolant Temperature, Core Outlet (°C) 327 Coolant Temperature, Core Inlet (°C) 296
| Temperature | Pressure | Enthalpy | Entropy | Quality | Work in | Heat in | Work out | Heat out (used) | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Units | T/C | P/Bara | h/kJ.kg-1 | s/kJ.kg-1.°C-1 | kJ.kg-1 | kJ.kg-1 | kJ.kg-1 | kJ.kg-1 | ||
| Feed Water | 90.0 | 1 | 377.1 | 1.1928 | #Subcooled liquid | |||||
| Pump Isentropic compression | 90.2 | 40 | 381.1 | 1.1928 | #Subcooled liquid | 4.0 | ||||
| Heat to Bpt | 250.4 | 40 | 1087.5 | 2.7968 | 0 | |||||
| Water - steam | 250.4 | 40 | 2800.8 | 6.0696 | 1 | |||||
| Degrees superheat | 39.6 | |||||||||
| Steam | 290.0 | 40 | 2933.0 | 6.3133 | #Superheated vapor | 2551.9 | ||||
| Ideal expansion | 102.3 | 1.1 | 2298.7 | 6.3133 | 0.8309 | |||||
| Real expansion IE=0.85 | 102.3 | 1.1 | 2393.8 | 6.5667 | 0.8732 | 539.2 | ||||
| Condense & subcool | 90.0 | 1.1 | 377.1 | 1.1928 | #Subcooled liquid | 2016.7 | ||||
| Work eff. | Heat eff. | |||||||||
| 21.0% | 79.0% | |||||||||
| say | 20% | 75% | ||||||||
| 80 MWe | 300 MWt |