Gas Turbine Generator
- Simple structure and excellent in reliability and maintainability.
|Gas Turbine Generator||Diesel Generator|
|Cooling Water||Not Required||Required|
|Routine Maintainability||1/3 the parts of a DG||Complex|
|Large Scale Overhaul||Several times during plant life||Periodic Overhaul Required|
|Reliability (failure/demand)||10-3based on Japanese experience||10-2|
|Starting Time||40 sec||10 sec|
The gas turbine generators supply electrical power to the essential components of the ECCS, so the safety functions can be maintained during a loss of offsite power.
The gas turbine is a very simple rotary engine with few components. The Safety Gas Turbine Generator (GTG) system consists of a GTG package, a fuel transport system, a starting system and a control/instrumental system. It does not need a water cooling system. The Safety GTG is started with air.
The advanced accumulator allows the gas turbine generator longer time to start with a max 100 seconds. Therefore starting time of gas turbine (40 sec) is acceptable.