Analytical Study on Boiling Transition under Flow-Power Oscillating Condition for Hyper ABWR(Light Water Reactor・Advanced Reactor,<Special Issue>Power and Energy System Symposium)

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  • 超高出力密度炉心ABWRの実用化(2) : 流量・出力振動下沸騰遷移現象に関する解析的研究(転水炉・次世代炉,<特集>第13回動力・エネルギー技術シンポジウム)
  • 超高出力密度炉心ABWRの実用化(2)流量・出力振動下沸騰遷移現象に関する解析的研究
  • チョウコウシュツリョク ミツド ロシン ABWR ノ ジツヨウカ 2 リュウリョウ シュツリョク シンドウ カ フットウ センイ ゲンショウ ニ カンスル カイセキテキ ケンキュウ

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Abstract

In the envisioned high-power density core plant, the degradation of stability is concerned that is attributed to the shortening of rod heat conduction time constant upon the dense fuel grid and the increment of pressure drop caused by the wall friction. To confirm the influence of such degradation on the fuel soundness, the bundle geometry critical power test was held under flow-power oscillation condition which envisages the unstable phenomenon occurring under in the flow transient event. This paper describes the analysis results of the cited test with sub-channel code NASCA, and the discussion of the mechanism of boiling transition under flow-power oscillating condition.

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