ふげん発電所の機器撤去に掛かる人工数評価モデルの検討,1; 第3・4給水加熱器室の機器撤去の解体工程

Study on applicability of evaluation model of manpower needs for dismantling of equipments in FUGEN, 1; Dismantling process in 3rd/4th feedwater heater room

芝原 雄司; 立花 光夫; 石神 努; 泉 正憲 ; 南光 隆

Shibahara, Yuji; Tachibana, Mitsuo; Ishigami, Tsutomu; Izumi, Masanori; Nanko, Takashi

「ふげん」において2008年度に実施した第3・4給水加熱器室の機器撤去作業のうち解体工程に掛かる人工数を管理データ評価システム(PRODIAコード)により計算し、既存の評価式の「ふげん」への適用性を評価した。その結果、JPDR解体の実績データから得た既存の評価式による人工数の計算結果は実績データと大きく異なった。特に、第3・4給水加熱器の撤去に掛かる人工数の計算結果はそれぞれ実績データの1.8倍、及び3.3倍となった。また、第3給水加熱器と第4給水加熱器の重量がほぼ同じであるにもかかわらず、その撤去に掛かる人工数は約2倍の違いが見られた。これらの違いについて検討し、違いの主な要因は、(1)既存の評価モデルの作業構成(粗断・細断・収納)と第3・4給水加熱器の作業構成(粗断・仮置き)が異なっている、(2)切断回数が第3給水加熱器と第4給水加熱器で異なっている、にあることから、給水加熱器の作業構成を考慮した新たな評価式を作成し、再度、第3・4給水加熱器の撤去に掛かる人工数を評価した。計算結果は実績データとよく一致し、新たに作成した評価式の妥当性を確認した。

Manpower needs for the dismantling process in FUGEN 3rd/4th feedwater heater room was calculated with the evaluation system (PRODIA Code), and it was inspected whether the conventional evaluation model had applicability for FUGEN or not. It was confirmed that the conventional evaluation model for feedwater heater had no applicability. In comparison of the calculated value with the actual data, we found two difference: (1) the evaluated manpower were significantly larger than the actual data, (2) the manpower need for the dismantling of 3rd feedwater heater was twice larger than that of 4th feedwater heater, though these equipments were almost same weight. It was found that these were brought (1) by the difference in the work descriptions of dismantling between JPDR and FUGEN, and (2) by that in the cutting number between 3rd feedwater heater and 4th one. The manpower needs for the dismantling of both feedwater heaters were calculated with a new calculation equation reflecting the descriptions of dismantling, and it was found that these results showed the good agreement with the actual data.