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- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 鈴木 寿章伊東 秀明大久保 利行田村 政昭
- Publication Date
- 1995-05
- Publication Date (W3CDTF)
- 1995
- Alternative Title
- Summary of countermeasures for reduction of radiation exposure from radioactive corrosion products(CPs) deposited on fuel cleaning system of "JOYO"
- Periodical title
- PNC TN9410 95-105
- Target Audience
- 一般
- Note (General)
- 出版タイプ: NA高速実験炉「常陽」の使用済炉心構成要素は、燃料洗浄設備において付着ナトリウムの蒸気と脱塩水による洗浄が行われる。このとき放射性腐食生成物(Corrosion Product:以下CPという)も同時に除去されて系統内に付着・蓄積する。このCPは放射線源となって燃料洗浄室の空間線量当量率を上昇させ、運転・保守時における作業員の主たる被ばく源となっている。空間線量当量率を下げ、運転・保守時の被ぼく低減を図るため、これまでにも化学除染等を実施してきたものの、機器の間隙部に付着したCPは十分に除去することはできなかった。このような背量のもとに、平成3年度から平成6年度にかけて以下の燃料洗浄設備における被ばく低減対策を実施した。(1)放射線映機化装量(RID)による線源部の確認(2)主要機器の遮蔽体設置(3)ドレン配菅の所整理(4)脱塩水循環系配管の更新(5)アルゴンガス循環系ミストトラップの追加設置(6)アルゴンガス系弁ドレンラインの設置この結果、燃料洗浄設備の主要作業エリアである燃料洗浄機器室(A-212室)でのエリアモニ夕の空間線量当量率は、被ぱく低減対策前の約1/3に低減することができた。本報告書は、これまでに実施した被ばく低減対策の実積とその成果についてまとめたものである。Many subassemblies have been washed by water in the fuel cleaning system of JOYO, and a large amount of radioactive corrosion products(CPs) was removed from the surface of the subassemblies. These CPs deposited on the wall of piping and components in the system cause radiation exposure of personnel at operation and maintenance of the system. Following countermeasures for the reduction of radiation exposure have been conducted from 1991 to 1994. (1)ldentification of radiation source points by a Radiation image Display(RID). (2)Shielding of components in the system. (3)Rearrangment of water drain lines. (4)Replacement of water circulation piping. (5)lnstallation of a mist trap to the argon gas circulation line. (6)Installatlon of drain piping to valves of the argon gas circulation line. The dose rate in the fuel cleaning equipment room(A-212) was reduced to about one third after conducting the countermeasures. This report discribes the result of the countermeasures for the reduction of radiation exposure of personnel at operation and maintenance of the fuel cleaning system in "JOYO".
- Source
- /PNC-TN9410-95-105.pdf (fulltext)