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  本文選題：非能動　切入點：安全殼冷卻系統(tǒng)　出處：《哈爾濱工程大學》2013年碩士論文　論文類型：學位論文

【摘要】：當核反應堆內發(fā)生如冷卻劑喪失事故(LOCA)和主管道蒸汽破裂事故(MSLB)等嚴重事故時，安全殼內會由于高溫工質（水、水蒸氣以及氫氣等）的排放而產生升溫升壓效應，若不及時排除熱量，安全殼可能會因超溫超壓而失效，因此需要設計一個可靠的安全殼熱量導出系統(tǒng)。本文中所研究的安全殼熱量導出系統(tǒng)采用非能動原理，利用系統(tǒng)回路內冷熱流體之間的密度差產生的自然循環(huán)驅動力，通過冷凝、對流及沸騰換熱的方式，對安全殼內的大氣進行降溫降壓。根據系統(tǒng)配置結構，，可以分為閉式與開式系統(tǒng)，其中閉式系統(tǒng)因系統(tǒng)壓力高低可以分為單相和兩相系統(tǒng)。 本研究中針對三種不同的熱量導出系統(tǒng)，采用C語言自主開發(fā)系統(tǒng)的熱工水力分析程序PCCS-C，對系統(tǒng)在不同的安全殼內環(huán)境條件和不同系統(tǒng)結構條件下進行系統(tǒng)自然循環(huán)能力及排熱能力的數值模擬計算分析，并根據計算結果對系統(tǒng)進行改進。計算的結果表明，三種系統(tǒng)對事故后安全殼內環(huán)境有著良好的自適應性，在一定范圍內變化的系統(tǒng)標高差對各系統(tǒng)的自然循環(huán)能力和排熱能力均無顯著影響。 此外，根據各個系統(tǒng)的設計參數和結構參數，采用RELAP5/MOD3.4程序對系統(tǒng)的運行特性和影響因素進行仿真計算與分析，并將計算結果與自主開發(fā)的熱量導出系統(tǒng)熱工水力特性分析程序的結果進行比較。結果表明Relap5對閉式單相系統(tǒng)的計算結果與PCCS-C程序的計算結果能較好的吻合，閉式兩相與開式系統(tǒng)的計算結果趨勢與PCCS-C程序的結果趨勢一致。
[Abstract]:When serious accidents such as loss of coolant and steam rupture in main pipes occur in a nuclear reactor, the pressure rise in containment will be due to the discharge of high temperature working fluids (water, water vapor, hydrogen etc.). If the heat is not eliminated in time, the containment may fail because of overtemperature and overpressure, so it is necessary to design a reliable heat derivation system for containment. The passive principle is used in the heat derivation system of containment studied in this paper. Using the driving force of natural circulation caused by the density difference between the cold and hot fluids in the system loop, the temperature and pressure of the atmosphere in the containment are reduced by means of condensation, convection and boiling heat transfer. According to the configuration of the system, It can be divided into closed system and open system, which can be divided into single phase system and two phase system because of system pressure. In this study, for three different heat transfer systems, The thermal hydraulic analysis program PCCS-Cdeveloped by C language was used to simulate and analyze the natural circulation capacity and heat discharge capacity of the system under different containment environment conditions and different system structure conditions. According to the calculation results, the system is improved. The results show that the three systems have good adaptability to the environment of the containment after the accident. There is no significant effect on the natural circulation capacity and heat removal capacity of each system with the system height difference varying within a certain range. In addition, according to the design parameters and structural parameters of each system, the operating characteristics and influencing factors of the system are simulated and analyzed by RELAP5/MOD3.4 program. The calculated results are compared with the results of the self-developed thermohydraulic analysis program for the heat derived system. The results show that the results of Relap5 for the closed single-phase system are in good agreement with the results of the PCCS-C program. The result trend of closed two phase and open system is consistent with that of PCCS-C program.
【學位授予單位】：哈爾濱工程大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TL364.3

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