高速実験炉「常陽」性能試験報告書; 通常運転時性能確認試験 PT-51 運転温度圧力確認(その3)

"JOYO" Start-up test report; Performence of Normal operational conditions PT-51 operational performance in miscellaneous systems (PART-I)

鈴木 利明*; 田村 正昭*; 鈴木 幸男*; 坂井 茂*

not registered; not registered; not registered; not registered

50MW出力上昇試験における運転データより出力50MWにおける格納容器床下熱負荷(床下に設置されている配管,機器等からの放熱)の評価を行った結果,出力50MWにおいてほぼ設計熱負荷1100MWにおいて約4.1105kcal/h)に達していることが明らかになった。本報告書は前述の結果に基づき床下雰囲気冷却機能増進の可能性を探るために実施した床下空調器および冷凍機の2台運転試験の結果をもとに出力75MWおよび100MWにおける床下熱負荷ならびに禾下空調器の性能等について述べたものである。75MWおよび100MWにおける床下熱負荷、定格熱負荷に対し75MWにおいては約6%,100MWにおいては約15%の増加が予測される。床下冷却機能増進の可能性、床下空調器の2台運転を行った場合1台運転と比べて床下の平均温度を低く保つことが可能である。但し冷凍機および冷媒ポンプの2台運転が必要となる。床下空調器の性能、空調器の熱貫流率はほぼ設計値を満足しているが空調器出口窒素ガス温度が設計値を約3程上回っている。これはフレオンガス配管の圧力損失が大きく空調器フィンチューブにおけるフレオンの蒸発温度が設計値の4を満足出来ないことが主な原因であると考えられる。

Heat load for nitrogen atmosphere cooling system at reactor power of 50MW was proved to be corresponding to the design value of approximately 4.1 10 Kcal/n which was estimated at the reactor power of 100MW. This report describes the predicted heat loads of the reactor power of 75MW and 100MW, possibility of ability to cool nitrogen atmosphere being increased and performance of the nitrogen atmosphere cooling system. They were obtained with results of dual operation of heat exchangers and refrigirators which was carried out to survey the possibility of ability to cool the nitrogen atmosphere being increased. (1)Predicted heat load at the reactor power of 75MW and 100MW Increasing rates of the heat load against the design value were as follows: [75 MW : approximately 6%] [100 MW : approximately 15%] (2)Possibility of ability to cool the nitrogen atmosphere being increased It is possible to lower a mean temperature of the nitrogen atmosphere with the dual operation of the heat exchangers, which however requires dual operations of the refrigirators and freon circulating pumps. (3)Performance of the nitrogen atmosphere cooling system Overall heat transfer coefficient of the heat exchangers satified its design value, however heat exchanger outlet nitrogen gas temperature was approximately 3C higher than its design value. This discrepancy of 3C was considered as the evapolation temperature of freon did not satisfy the deaign temperature.