並列タイトル等Out-of-Pile Experiments of Fission Gas Release in LMFBR Subassemdlies-2
一般注記Out-of-Pile experiments were conducted to evaluate the thermal and hydrodynamic effects due to gas release into sodium flowing in a 37-Pin bundle, which consisted of a central gas-injector pin, seven electrically heated pins and other dummy pins. Each pin, except the gas-injector pin, was wrapped with a spacer wire. Argon was released transiently or continuously through a nozzle (0.3, 0.5, 0.8 mm in diameter) on the gas-injector pin into flowing sodium. The experimental conditions were as follows. Transient release experiments; [Gas plenum pressure : 29.6 - 75.9 bar] [Gas plenum volume : 70, 1,240 cm$^{3}$] [Inlet sodium velocity : 1.95, 4.79 - 5.03m/s] [Heat flux : 36.4, 77.3 - 91.6W/cm$^{2}$] [Inlet sodium temperature : 228 - 276$^{\circ}$C] Continuous release experiments; [Gas plenum pressure : 6 - 64 bar] [Inlet sodium velocity : 0.45 - 5.07m/s] [Heat flux : 8.0 - 92.3W/cm$^{2}$] [Inlet sodium temperatures 238 - 290$^{\circ}$C] Pin surface temperatures increased by gas release. In the transient release experiments, the highest temperature rise was observed in the gas impingement area. Analyses of measured temperature rises by the transient heat transfer computer code SURFACE showed that the two-phase heat transfer coefficient after inception of gas release decreased to 1/20 - 3/20 of the sodium single-phase flow heat transfer coefficient. This two-phase heat transfer coefficient was similar to that obtained in the continuous release experiments. If the experimental results are extrapolated to reactor conditions, in which the heat flux is 200W/cm$^{2}$, the flow velocity is 5m/s, the temperature rise due to gas release is estimated to be less than 240$^{\circ}$C. The measured pressure pulses were less than 1/5 of initial gas plenum pressure in the transient release experiments. Neither damage nor deformation was observed in the pin bundle after the present experiments (total 14 transient experiments), and then the mechanical effect of FP gas release will be ...
None
一次資料へのリンクURL/PNC-TN941-77-39TR.pdf (fulltext)
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース(IRDB)(機関リポジトリ)
提供元機関・データベース日本原子力研究開発機構 : JOPSS:JAEA Originated Papers Searching System