核电厂系统及其设备复习题

1、核电厂系统及其设备复习题、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） PWR8）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 load2. _specify the steps required to go from one operating state to another.?The codes?The NRC?Th

2、e operators?The procedures3. When large decrease in turbine load the steam from the steam generators is sent to the_.? steam condenser? atmosphere? steam dump system? heat exchanger4. An excess of coolant inventory can result in a_.? power increase? temperature increase?reactor trip?turbine trip5. F

3、ollowing the coastdown of the coolant pumps, the core residual heat will be removed by? condensers? natural circulation?boiling heat transfer?emergency power6. The operation of a nuclear plant is _than operating a modern fossil fuel power station.? easier? more difficult? rather? more complex7. The

4、heat is transferred by the reactor coolant from the core to the_.? cecondary loop?outlet nozzles?steam generators? pressurizer8. The fuel rod provides_to the escape of fission products.? two barriers? three barriers? seals? a barrier9. The CEA guide tubes are made of_.? stainless steel? ceramic? zir

5、caloy?B4C10. The helium inside the fuel cladding improves the .?characteristic?gap heat conductivity?gap heat convection?clad strain11. The CEA guide tubes are arranged_.?in the fuel assembly? around the fuel assembly? in the center of fuel assembly? outside the fuel assembly12. The coolant can _thr

6、ough the guide tubes.? not flow? be? flow? pass13. There _ steam generator(s) in each primary loop.? is one? are two? are there? is noare mounted.14. At the top of the tube bundle shroud,? eggcrates? steam-water separators? plates? baffles15. Therein the system 80+ steam generator.?is one feedwater

7、inlet?are two feedwater inlets?are three feedwater inlets?are many feedwater inlets16. The flywheel on the motor is to provide?energy?water?coastdown flow ? torque17. The temperature of the water in the seal assembly is maintained within acceptable limits by_.? water? oil? steam? water and oil18. In

8、 accordance with the coolant temperature program,the average reactor coolant temperature is when steam demand is increased.? constant? fall? raised ? high19. In pressurized water reactors water is used as?moderator?coolant?both a and b?neither a nor b20. The thermal efficiency of PWRs is_.?more than

9、 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? plenum22. The ECCS is provided to_.? cool the core?control reactivity?control volume? drive pump23. There are_ successive barriers in PWR to prevent radi

10、oactivity escape.? two? three? four? five24. The containment enclose the.?reactor?reactor and pressurizer?primary system and secondary system?entire primary system25. From the text the safest nuclear power plant may be a _.?expensive one?cheap one?big one?small one26. Following a decrease in turbine

11、 load, the water pressure and temperature in the reactor_. ?will increase?increase?decrease?will be unchanged27. A temperature decrease of reactor vessel water results in an_.?insertion of control rods?power decease?power increase?increase of reactivity28. Loss of power is a _.?upset condition?abnor

12、mal increase?reactor trip?reactor shutdown accident29. Inadvertent auxiliary spray will result in.? temperature decrease? power decrease?pressure decrease?abnormal condition30. The long-term control of core reactivity means adjustment of.? control rods? boric acid? power output? coolant31. The burna

13、ble absorber rod assembly provides the capability of high absorber strength_.?in all its life?at the beginning ofrefueling?at the end of refueling cycle?during operation32. The fuel assemblies used in a reactor are_.?similar?different? three types? same33. In the fuel rod the spring is set on the_.?

14、pellet column?spacer disc? end cap? top34. The CEA guide tubes are welded to the_.? spacer grids? lower end fittings? control rods? end cap35. The fuel spacer grids are made of_.? stiff arches? springs? plates? zircaloy strips36. After long time radiation the boron carbide will_.? decrease in mass?b

15、e swelling?increase in mass? be dissipated37. The economizer increases the cold leg side _ before coolant leaving the steam generator.? flow rate? temperature? temperature difference? relative flow38. The water from the steam separators flows down into the _.? economizer? shroud? bundle? evaporator

16、section39. In the downcomer the water is_.? saturated? boiling? very cold? subcooled40. The pump is connected with the motor by a_.? diaphragm? tube? coupling? casing41. _ pressurizer heaters are connected to proportional controllers.? A few? The remaining? Most of the? Many42. The fluid from econom

17、izer section is? two-phase flow? boiling water? subcooled water? saturated water43. The amount of heat that has been converted in steam turbine is _ that removed in condenser.?more than?less than?same as?similar to44. The hot primary fluid exchanges its heat with the secondary fluid in the_.?pressur

18、izer?condenser?header? steam generators45. Residual heat-removal system remove the decay heat from the core_.? during plant operation? after plant shutdown?during start-up?during transient condition46. The _ is connected to the spent fuel pond by transfer canal.? containment? pressure vessel? pipe? reactor cavity47. One of the important factors influencing containment d