200949857 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種沸水式核電廠反應爐爐心放 置有裂痕控制棒位置之搜尋方法，尤指一種以計算冷爐 停機餘裕（Cold Shut Down Margin，SDM)而找出可暫 時放置有裂痕控制棒（Control Rod )位置之搜尋方法。 【先前技術】 由於控制棒在核電廠反應爐爐心運轉中可能會因 〇 為本身裂痕導致控制棒内吸收中子毒物之碳化硼 (Boron Carbide, B4C )流失，使該控制棒強度減弱，因 而可能影響到冷爐停機餘裕不足，而有臨界安全之顧 慮，進而在需要緊急停機時無法順利停機。故，一般習 用者係無法符合使用者於實際使用時之所需。 【發明内容】 本發明之主要目的係在於，可執行當爐心内有一根 控制棒發生破管事件時，計算該事件發生後所剩餘之最 ® 小冷爐停機餘裕係否符合法規要求，並將符合要求之位 置找出來，將該些位置暫時放置有破管之虞但還需繼續 在反應爐爐心運轉之控制棒，藉此於確認計算冷爐停機 餘裕後得知其臨界安全，以避免因冷爐停機餘裕不足而 發生需緊急停機時無法順利停機之顧慮。 為達以上之目的，本發明係一種沸水式核電廠反應 爐爐心放置有裂痕控制棒位置之搜尋方法，首先準備― 計算冷爐停機餘裕SIMULATE-3標準輸入檔，並執行其 SIMULATE-3程式計算，從計算結果摘要檔中紀錄所有 200949857 控制棒在每個燃耗點所對應之原始冷爐停機餘裕，並以 該計算冷爐停機餘裕SIMULATE-3標準輸入檔為參考 檔案，依不同之燃耗點來擷取該燃耗點下之卡片内容， 並指定一全出控制棒與一破管控制棒之位置；選擇該全 出控制棒位置，及其周圍複數根控制棒成為該破管控制 棒之候選者，並記錄各種控制棒位置組合下由 SIMULATE-3程式計算之爐心增殖因子，接著先判斷係 否完成所有燃耗點下各種控制棒組合之計算，再計算冷 〇 爐停機餘裕之變動量，然後於整理之結果搜尋出當爐心 存在一根破管控制棒下，係判斷全爐心最強棒之冷爐停 機餘裕係否符合法規要求，並於判斷全出控制棒之冷爐 停機餘裕與原始最強棒之冷爐停機餘裕之大小後，輸出 結果並結束搜尋。 【實施方式】 請參閱『第1圖』所示，係本發明之搜尋流程示意 圖。如圖所示：本發明係一種沸水式核電廠反應爐爐心 〇 放置有裂痕控制棒位置之搜尋方法，當本發明於運用 時，係假設一控制棒（Control Rod )破管造成其控制棒 頂端四分之一長度（即12個節距）四個葉片之碳化硼 (Boron Carbide，B4C)全部流失，且全爐心破管之控 制棒僅有一根，而週期中每一根控制棒皆可能係發生破 管之控制棒，則其執行搜尋有破管之虞控制棒位置之流 程係至少包括下列步驟： (A)準備計算冷爐停機餘裕（Cold Shut Down Margin，SDM) SIMULATE-3 標準輸入檔 1 1 :準備一 5 200949857 計算冷爐停機餘裕SIMULATE-3標準輸入檔； (B )執行SIMULATE-3程式計算並紀錄原始冷爐 停機餘裕1 2 :執行SIMULATE-3程式計算，以其 QPANDA模式計算爐心内所有無破裂之控制棒在全週 期所有燃耗點之原始冷爐停機餘裕，並從計算結果摘要 檔中紀錄所有控制棒在每個燃耗點所對應之原始冷爐 停機餘裕，其中，該原始冷爐停機餘裕為最小值者係表 示此根控制棒在此燃耗點下為最強棒，反之值越大者則 ❹ 代表其控制棒強度越弱； (C)指定全出控制棒與破管控制棒位置13:以 該計算冷爐停機餘裕SIMULATE-3標準輸入檔為參考 檔案，依不同之燃耗點來擷取該燃耗點下之卡片内容， 並將計算冷爐停機餘裕之CRD.SDM卡片及ITE.SDM卡 片去掉，且加入一 CRD.POS卡片，由該CRD.POS卡片 指定一全出控制棒與一破管控制棒之位置，其中，該全 出控制棒之位置係以抽出48個節距表示，而該破管控 制棒之位置則係以抽出12個節距（即四分之一長度） 表示； (D )選擇全出控制棒位置及破管控制棒之候選者 1 4 :選擇該全出控制棒位置，此全出控制棒周圍至多 8根控制棒成為該破管控制棒之候選者，其中，於步驟 (C )中每根控制棒均可被選為全出控制棒，且選擇之 順序係依其控制棒原始冷爐停機餘裕由小至大排列； (E )記錄爐心增殖因子Keffl 5 :記錄各種控制 棒位置組合下由SIMULATE-3程式計算之爐心增殖因 6 200949857 子 Keff ; (F)判斷係否完成所有燃耗 ，計算16:判斷係否完成所有 二、= :決)定各種控制棒組合之計算，未完成係回至步: (G)計算冷爐停機餘裕變動量i 7 ❹ Ο :-管:=:冷爐停機餘裕變動*，其計算方= 工，棒疋全抽出及另一根控制棒抽出12個節 =時之爐心增殖因子Keff,減去僅單—控制棒完全抽出 時之爐心增殖因子Keff後，再除以冷爐臨界目標值； f /H)記綠各種組合中之變動量18:將結果整理 後，記綠各種組合中控制棒破裂對於個別控制棒冷爐停 機餘裕之變動量，其中，該變動量將降低步驟（B )個 別控制棒所計算之原始冷爐停機餘裕； (I )判斷全爐心最強棒之冷爐停機餘裕係否符合 法規要求19:依步驟（H)整理之結果搜尋出當爐心 存在根破管控制棒下，判斷全爐心最強棒之冷爐停機 餘裕係否符合法規要求，否則至步驟（〇）結束搜尋； (J )判斷全出控制棒之冷爐停機餘裕與原始最強 棒之冷爐停機餘裕之大小2 〇 :判斷由步驟（I )所選 出之破管控制棒位置’其對應之全出控制棒所計算之冷 爐停機餘裕若小於原始最強棒之冷爐停機餘裕，係至步 驟（N)輸出控制棒搜尋位置之結果，並至步驟（〇） 結束搜尋；反之若大於原始最強棒之冷爐停機餘裕則代 表此全出控制棒並非最強棒，須進行重新搜尋最強棒位 7 200949857 置’依據爐心入口限声哭冷县起 (κ)繼績執行，反=量無四分之一對稱，至步驟 繼續執行；反之具有四为之一對稱則至步驟（L) ▲ (K)重新計算選出最強棒21:選擇步驟（B) 所什算出具有最小原始冷爐停機餘裕之燃耗點，依此燃 耗點計算全爐心控制棒之原始冷爐停機餘裕，從中選取 8根具有較小冷爐停機餘裕控制棒為全出控制棒之候選 者（此8根全出控制棒候選者乃是在步驟⑻所計算出之 〇帛—強棒至“強棒，分佈範圍為全爐外而破管控 制棒之候選者則由步驟（丨）決定，於重新計算後選出 最強棒，若此最強棒冷爐停機餘裕低於法規要求，則此 破管控制棒選定位置被移除，如果符合法規要求則保留 此破管控制棒位置，並至步驟（Μ); (L)重新計算選出最強棒22 :選擇步驟（Β) 所計算出具有最小原始冷爐停機餘裕之燃耗點，依此燃 U 耗點叶算之原始冷爐停機餘裕，從中選取2根具有較小 冷爐停機餘裕控制棒為全出控制棒之候選者（此2根全 出控制棒候選者乃是在步驟（3)所計算出之第一強棒與 第二強棒，分佈範圍為四分之一爐心，其位置需與破管 控制棒在同一象限内），而破管控制棒之候選者則由步 驟（I )決定，於重新計算後選出最強棒，若此最強棒 冷爐停機餘裕低於法規要求，則此破管控制棒選定位置 被移除’如果符合法規要求則保留此破管控制棒位置， 並至步驟（Μ); (Μ)判斷最強棒之冷爐停機餘裕係否均小於原始 8 200949857 最強棒之冷爐停機餘裕23:判斷所有選出 棒爐心下最強棒之冷爐停機餘裕，係否均小於原始最 1 棒之冷爐停機餘裕，否則回至步輝（】）. (N) 輸出結果2 4 :輸出控制棒搜尋位置之妹 以及 ^ ’ (O) 結束搜尋2 5 :結束搜尋。 綜上所述，本發明係-種彿水式核電廠反應爐爐心 放置有裂痕控制棒位置之搜尋方法，可有效改善習用之 〇 種種缺點，當爐心内有一根控制棒發生破管事件時，係 執行計算該事件發生後所剩餘之最小冷爐停機餘裕係 否符合法規要求’並將符合要求之位置找出纟，將該些 位置暫時放置有破管之虞但還需繼續在反應爐爐心運 轉之控制棒，藉此於確認計算冷爐停機餘裕後得知其臨 界安全，以避免因冷爐停機餘裕不足而發生需緊急停機 時無法順利停機之顧慮，進而使本發明之産生能更進 ❹步、更實用、更符合使用者之所須，確已符合發明專利 申請之要件，爰依法提出專利申請。 惟以上所述者’僅為本發明之較佳實施例而已，當 不能以此限定本發明實施之範圍；故，凡依本發明申請 專利範圍及發明說明書内容所作之簡單的等效變化與 修飾，皆應仍屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 第1圖’係本發明之搜尋流程示意圖。 【主要元件符號說明】 步驟（A)〜（〇)ii〜25 9200949857 IX. INSTRUCTIONS: [Technical field of invention] The present invention relates to a method for searching for a position of a crack control rod placed in a furnace core of a boiling water type nuclear power plant, especially for calculating a cold storage shutdown margin (Cold Shut Down) Margin, SDM) finds a search method that can temporarily place the position of the Control Rod. [Prior Art] Since the control rod may lose the boron carbide (Boron Carbide, B4C) in the neutron poison in the control rod due to the crack in the core of the reactor of the nuclear power plant, the strength of the control rod is weakened. It may affect the shortage of cold furnace shutdown, and there are critical safety concerns, so that it cannot stop smoothly when emergency shutdown is required. Therefore, the average user cannot meet the needs of the user in actual use. SUMMARY OF THE INVENTION The main object of the present invention is to perform a tube breakage event when a control rod is broken in the core, and calculate whether the remaining minimum cooling furnace remaining after the event occurs meets the regulatory requirements. Find out the location that meets the requirements, and temporarily place the control rods that have broken the tube but continue to run in the hearth of the reactor, so as to confirm the critical safety after confirming the calculation of the furnace shutdown margin, Avoid the concern that the shutdown of the cold furnace is insufficient and there is no need to stop the machine when it is urgently shut down. In order to achieve the above purpose, the present invention is a search method for placing a crack control rod position in a furnace core of a boiling water type nuclear power plant, first preparing a "computing SIMULATE-3 standard input file for the furnace shutdown and executing its SIMULATE-3 program. Calculate, record the original cold furnace shutdown margin corresponding to each 200949857 control rod at each fuel consumption point from the calculation result summary file, and use the calculation of the cold furnace shutdown margin SIMULATE-3 standard input file as the reference file, according to different combustion The point is taken to capture the contents of the card under the fuel consumption point, and a position of the control rod and a broken tube control rod is specified; the position of the entire control rod is selected, and a plurality of control rods around the control rod are selected as the broken tube control The candidate of the stick, and record the core growth factor calculated by SIMULATE-3 program under various control rod position combinations, and then judge whether the calculation of various control rod combinations under all fuel consumption points is completed, and then calculate the cooling furnace shutdown margin. The amount of change, and then searched for the result of the finishing, when there is a broken pipe control rod in the heart of the furnace, it is judged whether the furnace heart of the whole furnace is the best. After closing regulatory requirements, and to determine the size of the cold shutdown margin furnace annealing furnace shutdown margin of the whole of the control rod and the rod of the original strongest, and the output end of the search. [Embodiment] Please refer to Fig. 1 for a schematic diagram of the search flow of the present invention. As shown in the figure: The present invention is a search method for placing a crack control rod position in a hearth of a boiling water type nuclear power plant reactor. When the present invention is applied, it is assumed that a control rod is broken to cause a control rod. The top quarter length (ie 12 pitches) of the four blades of Boron Carbide (B4C) is completely lost, and there is only one control rod for the whole heartbreak, and each control rod in the cycle is It may be that the control rod is broken, and the process of performing the search for the position of the control rod with the broken tube includes at least the following steps: (A) Preparing to calculate the Cold Shut Down Margin (SDM) SIMULATE-3 standard Input file 1 1 : Prepare a 5 200949857 Calculate the cooling furnace shutdown margin SIMULATE-3 standard input file; (B) Perform SIMULATE-3 program calculation and record the original furnace shutdown margin 1 2: Perform SIMULATE-3 program calculation with its QPANDA The model calculates the original cold furnace shutdown margin of all the non-ruptured control rods in the heart of the furnace at all fuel consumption points in the whole cycle, and records the original of all the control rods at each fuel consumption point from the calculation result summary file. The cold furnace shutdown margin, wherein the original cold furnace shutdown margin is the minimum value indicates that the root control rod is the strongest rod under the fuel consumption point, and the larger the value is, the weaker the control rod strength is; Specifying the all-out control rod and the broken tube control rod position 13: using the calculation of the cooling furnace shutdown margin SIMULATE-3 standard input file as a reference file, according to different fuel consumption points to capture the card content under the fuel consumption point, and The CRD.SDM card and the ITE.SDM card for calculating the cold storage shutdown margin are removed, and a CRD.POS card is added, and the position of the control rod and the broken control rod is designated by the CRD.POS card, wherein The position of the full control rod is represented by 48 pitches, and the position of the broken control rod is represented by 12 pitches (ie, a quarter length); (D) Selecting the position of the entire control rod And the candidate for the broken control rod 1 4: selecting the position of the full control rod, at most 8 control rods around the entire control rod become candidates for the broken control rod, wherein each of the steps (C) Control rods can be selected as all-out control rods, and the order of selection According to the control rod, the original cold furnace shutdown margin is arranged from small to large; (E) Record the heart growth factor Keffl 5: Record the core propagation factor calculated by SIMULATE-3 program under various control rod position combinations 6 200949857 Sub Keff ; F) Judging whether all fuel consumption is completed, calculation 16: judging whether to complete all the two, =: decision) to calculate the various control rod combinations, the unfinished system returns to the step: (G) calculate the cooling furnace shutdown margin variation i 7 ❹ Ο :- tube:=: cold furnace shutdown margin change*, its calculation side = work, the rod is fully extracted and the other control rod draws 12 knots = the heart's heart growth factor Keff, minus only one - After the control rod is completely extracted, the core growth factor Keff is divided by the critical target value of the cold furnace; f / H) The variation in the various combinations of greens 18: After the results are sorted, the control rods are broken in various combinations of green The fluctuation of the individual control rod cooling furnace shutdown margin, wherein the variation will reduce the original furnace shutdown margin calculated by the individual control rods in step (B); (I) determine whether the whole furnace heart is the strongest cold furnace shutdown margin Compliance with regulatory requirements 19: Search by results of step (H) When there is a root breakage control rod under the heart of the furnace, it is judged whether the cold furnace shutdown of the whole furnace heart is in compliance with the regulations, otherwise the search is completed by the step (〇); (J) The furnace stop of the control rod is judged. Yu Yu and the original strongest cold furnace shutdown margin 2 〇: judge the position of the broken pipe control rod selected by step (I) 'The corresponding cold control shutdown bar is less than the original strongest Cooling furnace shutdown margin, to step (N) output control rod search position results, and to step (〇) to end the search; if the greater than the original strongest cold furnace shutdown margin means that this all-out control stick is not the strongest, Must be re-searched for the strongest player 7 200949857 Set 'According to the heart of the furnace entrance limit crying cold county (κ) succession performance, reverse = no quarter of the symmetry, to the step to continue; otherwise has four for one symmetry Then to step (L) ▲ (K) recalculate and select the strongest rod 21: select step (B) to calculate the fuel consumption point with the minimum original furnace shutdown margin, and calculate the original of the whole furnace control rod according to the fuel consumption point Cold furnace Ji Yuyu, from which 8 candidates with smaller furnace shutdown control rods are selected as the all-out control rods (the 8 all-out control stick candidates are calculated in step (8) - strong stick to " The strong stick, the distribution range is the whole furnace and the candidate for the broken pipe control rod is determined by the step (丨), and the strongest rod is selected after recalculation. If the strongest cold furnace shutdown margin is lower than the regulatory requirements, then the pipe is broken. The selected position of the control rod is removed, if the regulatory requirements are met, the position of the broken control rod is retained, and the step (Μ) is performed; (L) Recalculation selects the strongest rod 22: The selection step (Β) is calculated to have the smallest original cold The fuel consumption point of the furnace shutdown is based on the original furnace cooling margin of the fuel consumption point, and two candidates with smaller furnace shutdown control rods are selected as the total control rods. The control rod candidate is the first strong rod and the second strong rod calculated in the step (3), and the distribution range is a quarter of the core, and the position needs to be in the same quadrant as the broken control rod) The candidate for the broken tube control rod is determined by step (I) Set, after recalculation, select the strongest rod. If the maximum strength of the cold furnace is lower than the regulatory requirements, the selected position of the broken control rod is removed. If the compliance is required, the position of the broken control rod is retained. Step (Μ); (Μ) Judging whether the strongest cold furnace shutdown margin is less than the original 8 200949857 The strongest cold furnace shutdown margin 23: Judging all the best cold furnace shutdowns under the selected furnace, whether Less than the original 1st bar cold furnace shutdown margin, otherwise return to Buhui (]). (N) Output result 2 4: Output control stick search position sister and ^ ' (O) End search 2 5: End search. In summary, the present invention is a search method for the position of a crack control rod placed in the hearth of the reaction water furnace of the Foshui type nuclear power plant, which can effectively improve various defects of the conventional use, and there is a control rod in the heart of the furnace. When performing the calculation, the minimum remaining furnace shutdown margin remaining after the occurrence of the event is in compliance with the regulatory requirements, and the location that meets the requirements is found, and the locations are temporarily placed with a broken pipe but still need to continue to react. The control rod of the hearth of the furnace is used to confirm the critical safety of the cold furnace after the calculation of the residual capacity of the cold furnace, so as to avoid the concern that the cold shutdown failure is insufficient and the shutdown cannot be smoothly performed when the emergency shutdown is required, thereby causing the invention to be generated. It can be more responsive, more practical, and more in line with the needs of users. It has indeed met the requirements of the invention patent application, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the present invention All should remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of the search flow of the present invention. [Main component symbol description] Step (A) ~ (〇) ii ~ 25 9