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由于控制棒抽出引起堆芯内反应性失控增加,从而导致核功率剧增的事故定义为一组控制棒组件抽出事故。这种瞬态可能是反应堆控制系统或棒控系统失灵引起的。多普勒负反应性反馈效应能在保护动作延迟的时间内将功率限制在可接受的水平。该事故中,燃料棒表面可能发生偏离泡核沸腾(departure from nucleate boiling,简称DNB),导致燃料元件包壳烧毁;燃料芯块也可能发生熔化,对包壳产生不利影响。文章对岭澳混合堆芯和提高富集度论证次临界或低功率启动工况下提棒事故进行了分析。分析结果表明,事故瞬态中不会发生燃料芯块熔化或燃料元件包壳烧毁,可以保证燃料元件的完整性,燃料设计满足限制准则。
The accidental uncontrollability of the reactor core due to the withdrawal of the control rod resulted in an accident that led to a sharp increase in nuclear power as a control rod assembly extraction accident. This transient may be caused by failure of the reactor control system or the rod control system. The Doppler Negative Reactive Feedback Effect limits the power to an acceptable level for the duration of the protection action delay. In this accident, departure from nucleate boiling (DNB) may occur on the surface of the fuel rod, leading to the burning of the fuel element cladding; the fuel pellet may also be melted and adversely affect the cladding. In this paper, the author analyzed the Lingting-Macao hybrid core and the enrichment degree demonstration submerged or low-power start-up condition. The analysis shows that no fuel pellets melted or the fuel cladding was burnt down during the accident transient, which ensured the integrity of the fuel elements and the fuel design met the limit criterion.