發(fā)布時間：2018-11-24 13:37

【摘要】：核電廠安全殼地坑濾網(wǎng)潛在堵塞問題長期以來一直是國際核工業(yè)界重點(diǎn)關(guān)注的核安全問題。傳統(tǒng)設(shè)計(jì)中,假設(shè)安全殼地坑濾網(wǎng)堵塞率小于50%,這一假設(shè)是不保守的,存在重大核安全風(fēng)險。根據(jù)NRC技術(shù)導(dǎo)則要求,對核電廠的相關(guān)事故情景進(jìn)行分析,確定最保守的工況及該工況下的系統(tǒng)工藝參數(shù),作為后續(xù)分析工作的輸入數(shù)據(jù)。對電廠的相關(guān)設(shè)計(jì)資料進(jìn)行收集,開展現(xiàn)場踏勘核實(shí)電廠實(shí)際狀態(tài)與圖紙狀態(tài)的一致性。根據(jù)輸運(yùn)到地坑濾網(wǎng)的碎片數(shù)量最大或輸運(yùn)到地坑濾網(wǎng)的碎片組合最壞的原則,選擇可能存在的5種保守破口類型,并針對最保守的破口工況開展碎片生成分析。對于不同類型的保溫碎片還需確認(rèn)ZOI(Zone Of Influenced)及其形狀和大小,最終得到事故后生產(chǎn)碎片的數(shù)量和性質(zhì)。根據(jù)碎片生成分析結(jié)果,參照NEI-04-07導(dǎo)則,進(jìn)行了碎片的輸運(yùn)分析。碎片輸運(yùn)主要考慮噴放輸運(yùn)、噴淋沖洗輸運(yùn)、地坑充水輸運(yùn)和再循環(huán)輸運(yùn)四種類型。通過采用邏輯樹和精細(xì)分析兩種分析方法,分別計(jì)算傳輸?shù)降乜訛V網(wǎng)的各種碎片的輸運(yùn)份額,從而得到兩種計(jì)算方法下輸運(yùn)到地坑濾網(wǎng)的碎片總量。結(jié)合電廠已有的數(shù)據(jù)輸入,進(jìn)行地坑濾網(wǎng)容量計(jì)算,并對所采購的地坑濾網(wǎng)進(jìn)行了設(shè)備試驗(yàn)鑒定。采用常溫下多組試驗(yàn)條件進(jìn)行試驗(yàn),利用溫度修正法得出事故后120℃工況下的地坑濾網(wǎng)壓損。本文總結(jié)CPR1000核電廠安全殼地坑濾網(wǎng)潛在失效問題的研究經(jīng)驗(yàn)和主要技術(shù)結(jié)論。參考美國率先開展的安全殼地坑濾網(wǎng)潛在堵塞問題研究成果,以美國NRC相關(guān)規(guī)定和技術(shù)導(dǎo)則為依據(jù),對CPR1000核電廠的地坑濾網(wǎng)潛在堵塞問題進(jìn)行了全面、系統(tǒng)的分析和評估,提出了地坑濾網(wǎng)潛在堵塞問題的解決方案,并在CPR1000核電工程上進(jìn)行了實(shí)施,有效解決了地坑濾網(wǎng)潛在堵塞問題,消除了相關(guān)的核安全風(fēng)險。
[Abstract]:The potential clogging of containment pit filters in nuclear power plants has long been a nuclear safety problem focused on by the international nuclear industry. In the traditional design, the assumption that the clogging rate of containment pit filter is less than 50 is not conservative, and there are significant nuclear safety risks. According to the requirements of NRC technical guidelines, the relevant accident scenarios of the nuclear power plant are analyzed, and the most conservative operating conditions and the system process parameters under the condition are determined as the input data for the subsequent analysis. Collect relevant design data of power plant and carry out site survey to verify the consistency between actual status and drawing state of power plant. According to the principle of the maximum number of fragments transported to the ground pit filter or the worst combination of the fragments transported to the ground pit filter, five possible conservative break types are selected, and the debris generation analysis is carried out for the most conservative break condition. For different types of thermal insulation debris, ZOI (Zone Of Influenced) and its shape and size should be confirmed, and the quantity and properties of the fragments produced after the accident can be obtained. According to the results of debris generation analysis and NEI-04-07 guidelines, the transport of fragments was analyzed. Debris transport mainly includes spray transport, spray flushing transport, pit filling transport and recycle transport. By using the logical tree and fine analysis methods, the transport shares of various fragments transferred to the ground pit filter net are calculated, respectively, and the total amount of debris transported to the ground pit filter net is obtained under the two calculation methods. Combined with the existing data input of the power plant, the capacity of the ground pit filter was calculated, and the equipment test and appraisal of the purchased ground pit filter were carried out. The pressure loss of the filter net at 120 鈩，

本文編號：2353928