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核电厂系统及其设备复习题

一、根据系统图，简要解释核能发电原理。

二、名词解释 1）质能关系 2）裂变 3）临界状态 4）反应性 5）半衰期 6）一回路 7）PWR

8）蒸汽发生器 9）稳压器 三、选择题

1. The nuclear power station provides ___ for the utility grid. ? expensive electricity ? base load

? peak load ? full load

2. __specify the steps required to go from one operating state to another. ? The codes ? The NRC

? The operators ? The procedures

3. When large decrease in turbine load the steam from the steam generators is sent to the__. ? steam condenser ? atmosphere

? steam dump system ? heat exchanger

4. An excess of coolant inventory can result in a___. ? power increase

? temperature increase ? reactor trip ? turbine trip

5. Following the coastdown of the coolant pumps, the core residual heat will be removed by___. ? condensers

? natural circulation ? boiling heat transfer ? emergency power

6. The operation of a nuclear plant is ___than operating a modern fossil fuel power station. ? easier

? more difficult ? rather

? more complex

7. The heat is transferred by the reactor coolant from the core to the___. ? cecondary loop ? outlet nozzles ? steam generators ? pressurizer

8. The fuel rod provides___to the escape of fission products. ? two barriers ? three barriers ? seals ? a barrier

9.The CEA guide tubes are made of__. ? stainless steel ? ceramic ? zircaloy ? B4C

10. The helium inside the fuel cladding improves the ____. ? characteristic

? gap heat conductivity ? gap heat convection ? clad strain

11. The CEA guide tubes are arranged___. ? in the fuel assembly

? around the fuel assembly ? in the center of fuel assembly ? outside the fuel assembly

12. The coolant can ___through the guide tubes. ? not flow ? be ? flow ? pass

13. There ___ steam generator(s) in each primary loop. ? is one ? are two

? are there ? is no

14. At the top of the tube bundle shroud, ___ are mounted. ? eggcrates

? steam-water separators ? plates ? baffles

15. There ___ in the system 80+ steam generator. ? is one feedwater inlet ? are two feedwater inlets ? are three feedwater inlets ? are many feedwater inlets

16. The flywheel on the motor is to provide___. ? energy ? water

? coastdown flow ? torque

17. The temperature of the water in the seal assembly is maintained within acceptable limits by___. ? water ? oil ? steam

? water and oil

18. In accordance with the coolant temperature program,the average reactor coolant temperature is ____ when steam demand is increased. ? constant ? fall ? raised ? high

19. In pressurized water reactors water is used as___. ? moderator ? coolant

? both a and b ? neither a nor b

20. The thermal efficiency of PWRs is___. ? more than 40% ? about 30% ? less than 10% ? about 70%

21. The space between the reactor vessel and the core barrel is the ___. ? fuel rods ? control rods ? downcomer ? plenum

22. The ECCS is provided to___. ? cool the core ? control reactivity ? control volume ? drive pump