1. The chemical and volume control system functions to maintain the coolant inventory, to control the coolant chemistry and to adjust the boron concentration of the reactor coolant system.
1. 化容系統(tǒng)的功能：維持主系統(tǒng)的水裝量，控制主冷卻劑的化學性能和調(diào)節(jié)主系統(tǒng)的硼濃度。
2. During normal operation, reactor coolant flows through the letdown line from one of reactor coolant cold legs, is processed and then returned to the same cold leg through charging line.
2. 正常運行時，從一個主管道的冷段引出下泄流，經(jīng)過處理后，通過上充管線返回注入到相同的冷段管道。
3. The regenerative heat exchanger provides the initial cooling of the letdown fluid by preheating the returning charging stream and the letdown orifice(s) control the amount of coolant that is letdown (removed) from the reactor coolant system and provides the initial pressure reduction of this high pressure fluid.
3. 預(yù)熱上充流的過程，使得再生熱交換器給下泄流提供了最初的冷卻。下泄節(jié)流孔板控制從主系統(tǒng)流出的流量，同時它也給提供了下泄流的初始壓降。
4. The letdown heat exchanger reduces letdown fluid temperature to a value that is compatible with the ion exchanger resin.
4. 下泄熱交換器將流體的溫度降到合適的定值，這個溫度下，凈化床工作允許。
5. The letdown back-pressure regulating valve maintains pressure in the section of letdown upstream or the letdown heat exchanger to prevent the letdown liquid flashing to steam.
5. 下泄背壓控制閥維持下泄流上游段或下泄熱交換器處的壓力，防止壓力過低引起流體汽化。
6. The letdown ion exchangers (demineralizers) are designed to remove ionic impurities from the reactor coolant.
6. 凈化床的作用是除去冷卻中的離子態(tài)的雜質(zhì)。
7. All of the ion exchanger resins are temperature sensitive; therefore, a temperature diver valve bypasses letdown flow if the letdown heat exchanger outlet temperature rises to a predetermined value.
7. 所有的樹脂床對溫度都有要求，因此當溫度超過預(yù)定值時，下泄流將旁通凈化床運行。
8. The volume control tank collects the purified, filtered letdown fluid and provides a suction reservoir and head for the charging pumps.
8. 容控箱收集凈化、過濾后的下泄流，同時它給上充泵提供凈正吸入壓頭。
9. The charging system contains three pumps: two redundant centrifugal charging pumps and a positive displacement pump.
9. 上充系統(tǒng)有三臺泵：兩臺互為備用的離心上充泵和一臺往復(fù)式上充泵。
10. In addition to the charging function, the centrifugal pumps also serve as the high head safety injection pumps during emergency core cooling system operation.
10. 除了上充功能，應(yīng)急堆芯冷卻系統(tǒng)運行時，離心上充泵用作高壓安注的一部分。
11. The reactor coolant makeup system provides a method of supplying concentrated boric acid, demineralized reactor makeup water or a mixture of both, to the volume control tank or the charging pump suction head.
11. 反應(yīng)堆補給水系統(tǒng)提供濃硼酸，除鹽水或是兩者混合的液體，注入點為容控箱或上充泵吸入口。
12.The chemical addition system allows the addition of lithium hydroxide for pH control of the reactor coolant system and the addition of hydrazine for oxygen control when the reactor is a cold shutdown.
12. 化學添加系統(tǒng)用于向反應(yīng)堆冷卻劑系統(tǒng)添加LiO2以調(diào)節(jié)PH值，或是添加聯(lián)氨用于在冷停堆的情況下除氧。
