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題 名 | 氣態碘之化學研究與BWR電廠空浮放射性碘釋放之檢討=Investigation of Gas Phase Iodine Chemistry and Airborne Radioiodine Release from BWR Plants |
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作 者 | 林建昌; 楊末雄; 孫毓璋; 朱嘉康; 沈四杰; 高瑞廷; 黃仁川; | 書刊名 | 台電工程月刊 |
卷 期 | 606 1999.02[民88.02] |
頁 次 | 頁28-42 |
分類號 | 449.6 |
關鍵詞 | 放射性化學; 空浮放射性碘; 主煙囟; 沸水式反應器; Radiation chemistry; Airborne radioiodine; Main stack; BWR; |
語 文 | 中文(Chinese) |
中文摘要 | 本報告係臺電委託計畫「微量碘化學及電廠空浮放射性碘釋放路徑研究」之重要 部份結果,其內容包括實驗研究之結果與電廠空浮放射性碘之測量與釋放之探討。實驗之主 要目的是對氣態碘經伽馬照射後之化學變化的研究,探討各種不同空浮碘的形成與變化。此 一實驗係利用清華大學三萬居里的鈷 -60 照射源將碘化鉀溶液霧化後帶入氣體照射管中照 射,再分析照射後在氣體中碘的化學形態。我們發現 KI 很容易被氧化成 HIO、I �砲H及有 機碘,證明了 HIO 在氣相中的存在,也間接證明它的揮發性。在實驗中我們也了解 HIO 與 I �祖漣峖酉P空氣環境中的化學有相當大的關係。 目前 BWR 電廠因為燃料幾無破損,又設 備洩漏率低,放射性碘的空浮釋放也就微乎其微,而在核一與核二之各固定廢氣排放取樣點 都無法測得放射性碘的存在。唯一能測得放射性碘的取樣點是核一的主煙囟,因為核一是利 用「活」的蒸汽當 Gland Seal, 因此蒸汽中之碘同位素變成空浮後自然的從主煙囟釋放。 我們測得的化學成份幾乎在 90% 以上是有機碘,這與國外測量的結果類似。 從過去之經驗 , BWR 電廠之空浮 I-131 排放可從爐水之 I-131 濃度推算,大約是爐水每 1uCi/g 的排 放量是 1uCi/sec。 |
英文摘要 | This paper summarizes the major results obtained in a research project investigating the behavior of iodine at very low concentrations. This project includes laboratory studies on radiation effects of iodine and the measurements of airborne radioiodine releases in nuclear power plants. The laboratory study was conducted ot investigate the behavior of iodine in the gas phase under gamma irradiation. It was found that KI in aerosol was easily oxidized to I �� and HIO, and some KI was converted to organic iodine when organic additive was presented in the KI solution. The results also indicated that the behavior of irradiated iodide aerosol depended on the chemistry environment in both the aerosol and carrier gas. The airborne radioiodine release in two BWR nuclear power plants has been so low that only the samples taken from the main stack at Chinshan could be analyzed for iodine species. It was found that>90% of the radioiodine in these samples was in organic forms, which is consistent with that observed in most foreign BWR plants. Based on past experience, the airborne I-131 activity release can be related to the I-131 concentration in the reactor water. The ratio of approximately 1 uCi/sec release rate to 1uCi/g of I-131 concentration in reactor water has been estimated. |
本系統中英文摘要資訊取自各篇刊載內容。