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高速炉蒸気発生器伝熱管におけるナトリウム-水反応時の水側伝熱特性

Heat transfer characteristics inside tube caused by sodium-water reaction in FBR steam generator

栗原 成計; 大島 宏之; 柳沢 秀樹*

Kurihara, Akikazu; Ohshima, Hiroyuki; Yanagisawa, Hideki*

高速炉蒸気発生器では伝熱管からの水漏えいで生じるナトリウム-水反応により、高温かつ高腐食性の反応ジェットが形成される。高温の反応ジェットに曝される隣接伝熱管は、その機械的強度が低下し内圧によって破損する可能性がある。このため、高温ラプチャ現象を高精度に予測するには、伝熱管温度を詳細に評価する必要がある。そこで、ナトリウム冷却高速炉蒸気発生器の部分負荷運転条件である伝熱管に対し、ナトリウム-水反応を模擬した急速加熱試験を行い、伝熱管内表面での熱流束及び温度を推定して水側伝熱特性の空間特性を定性的に確認した。

Sodium reacts chemically with water in case of unexpected tube failure of steam generator (SG) in fast breeder reactor (FBR), exoergic reaction produced reaction field with high temperature and high corrosive (sodium-water reaction). Adjacent tubes are exposed to the reaction field and have possibility of overheating rupture by inner pressure with reduction of material strength. It is integral to predict the event with high accuracy that we understand characteristics of heat transfer inside tube in detail. Rapid heating experiment equivalent to sodium-water reaction has been carried out under high pressure, low mass flow rate and high subcooling, Heat flux and temperature on inner wall were estimated correctly by inverse problem solution. As the result of present study, we confirm heat transfer characteristics inside tube qualitatively.

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