核電廠（NPPs）正日益成為一個(gè)可行的替代能源基地。核電廠的安全問(wèn)題在很大程度上得到了緩解,這要?dú)w功于嚴(yán)格的設(shè)計(jì)和核工業(yè)以安全為重點(diǎn)的態(tài)度。國(guó)際核工業(yè)界正在付出巨大的努力來(lái)提高核電站的設(shè)計(jì),儀表控制水平,以進(jìn)一步提高核電站的效率和安全性。盡管有多種預(yù)防措施,但仍然有多種災(zāi)難性事故發(fā)生,并將其摧毀。本文就考慮這樣的一個(gè)事故序列SBLOCA。喪失冷卻劑事故（LOCA）,可能會(huì)導(dǎo)致安全殼內(nèi)氫氣的聚積。如果聚集的氫氣不能及時(shí)消除,安全殼內(nèi)的氣體混合物可能在合適的條件下發(fā)生燃爆,這樣的燃爆就有可能涉及到安全殼的完整性問(wèn)題。一個(gè)足夠強(qiáng)大的燃爆足以摧毀安全殼,從而反應(yīng)堆最后的安全屏障破壞,放射性碎片就會(huì)泄漏到環(huán)境中。本文以大亞灣核電站為背景,研究了1號(hào)SG（蒸汽發(fā)生器）隔間發(fā)生小破口喪失冷卻劑事故。并用GASFLOW軟件進(jìn)行建模和仿真。并得到了兩種情形下：（i）投入緩解措施,（ii）不投入緩解措施,安全殼內(nèi)氫氣的分布。并模擬得到了諸如溫度,壓力,氣體混合物的體積分?jǐn)?shù),火焰加速風(fēng)險(xiǎn)等描述混合物行為的關(guān)鍵參數(shù)。兩種情形下氫氣行為的差異將有助于我們了解燃爆的可能性以及并在大亞灣安全殼內(nèi)緩解措施的成效。分析... 

【文章頁(yè)數(shù)】：68 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
摘要
Abstract
Nomenclature
Chapter 1 Introduction
    1.1 Background and Significance
    1.2 Research Status
        1.2.1 Research Status:Abroad
            1.2.1.1 Hydrogen Management Strategies
            1.2.1.2 Advances in Simulation Codes
            1.2.1.3 Advances in Experimental Setups
        1.2.2 Reseatch Status:China
    1.3 Thesis Outline
Chapter 2 Hydrogen Risk and it's Mitigation
    2.1 Hydrogen Risk
    2.2 Hydrogen Risk Mitigation
        2.2.1 Pre-inerting of Containment
        2.2.2 Post-inerting of Containment
        2.2.3 Post-accident Dilution
        2.2.4 Early Venting
        2.2.5 Deliberate Ignition
            2.2.5.1 Glow Plug Igniters
            2.2.5.2 Spark Igniters
            2.2.5.3 Catalytic Igniters
        2.2.6 Spontaneous Ignition
        2.2.7 Catalytic Recombination
        2.2.8 Mixed Measures
            2.2.8.1 Catalytic Recombiners and Igniters
            2.2.8.2 Catalytic Recombination and Post-CO_2 Injection
Chapter 3 Modeling of DayaBay NPP Containment
    3.1 DayaBay NPP
        3.1.1 Reactor Coolant System(RCP)
    3.2 GASFLOW
        3.2.1 Introduction
        3.2.2 GASLFOW Physical Model
            3.2.2.1 Hydrodynamic Model
            3.2.2.2 Heat Transfer and Phase Change Model
            3.2.2.3 κ-ε Turbulence Model
        3.2.3 Hydrogen Igniter Model
        3.2.4 Passive Hydrogen Recombiner Model
        3.2.5 Hydrogen Risk Analysis Criteria
    3.3 GASFLOW model of DayaBay NPP
        3.3.1 Choose Coordinate System
        3.3.2 Define Mesh
        3.3.3 Model the Physical Objects
        3.3.4 Define Initial Conditions and Gas Source(s)
            3.3.4.1 Hydrogen Source
        3.3.5 Implement Hydrogen Risk Mitigation Measures
        3.3.6 Set Simulation Parameters
Chapter 4 Simulation Results
Chapter 5 Conclusion and Recommendations
    5.1 Conclusion
    5.2 Recommendations
References
Acknowledgements
About the Author



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