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- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 大山 一弘川原 啓孝有吉 昌彦礒崎 和則菅谷 和司深見 明弘
- Publication Date
- 2005-03
- Publication Date (W3CDTF)
- 2005
- Alternative Title
- MK-III Performance Tests in JOYO; Heat Transfer Characteristics of IHX, DHX (PT-312)
- Periodical title
- JNC TN9410 2005-005
- Target Audience
- 一般
- Note (General)
- 出版タイプ： NA高速実験炉「常陽」のMK-IIIでは、定格熱出力が1.4倍となることに対応し、主中間熱交換器(以下、IHXと略称)および主冷却機(以下、DHXと略称)を交換するとともに、1次主冷却系、2次主冷却系の流量を増加させた。これらの交換機器を含めた冷却系が十分な除熱性能を有することを確認する試験の一つとして、定常伝熱特性試験を行い、ヒートバランス、IHXおよびDHXの除熱性能を評価した。本報告書は、性能試験のうち、原子炉出力が約20\%、50\%、70\%、75\%、90\%および100\% (140MWt)時の定常状態でのプラント各部の定常伝熱特性およびヒートバランスを確認した結果を報告するものである。概要は、以下のとおりである。(1) 定格熱出力でのヒートバランスより、改造したプラントが所定の性能を有することを確認した。(2) 2ループある冷却系のうちB系のIHXの2次側入口温度がA系より約6$^{\circ}C$高い。これは、ループ間の1次系流量の差(約2\%)が要因の一つと考えられ、A系の1次系流量を正としB系を補正流量とすると、A系とB系の除熱量はバランスし、A系とB系のIHXの伝熱性能はほぼ等しいことが確認できた。その結果、主中間熱交換器の熱貫流率はAループが設計値の約125\%、Bループが設計値の約129\%であり、2つのIHXが同等の性能および十分な除熱性能を有することを確認した。(3) DHX入口空気温度を約20$^{\circ}C$とし、定格熱出力運転時のDHXNa側除熱量とDHX出入口空気温度からDHX出口空気風量を算出すると、DHXでは、設計値(6,750m$^{3}$/min)の85$\sim$90\%の風量で定格熱出力に相当する除熱能力を確保できることが確認できた。定格熱出力運転時の主送風機入口ベーン開度が性能試験期間を通じ、約35\%であったことも含めると、DHXは十分な除熱性能を有することを確認した。The experimental fast reactor JOYO MK-III increased that the reactor thermal power by the factor 1.4. The main intermediate heat exchangers (IHX) and the dump heat exchangers (DHX) were exchanged. And then, the flow rate of the main cooling system, the secondary cooling system were increased. As one of the performance test to confirm that the cooling system which included these switch receptacles has an enough decay heat performance, it did an heat transfer characteristics test and it evaluated a heat balance, the decay heat performance of IHX and DHX.The outline is as follows.(1)It confirmed that the modificated plant had fixed performance by the heat balance of full power.(2)The secondary inlet temperature of B-loop IHX is about 6degree higher out of the cooling system with A-loop. It thinks that this is one because of the difference ( about 2 \% ) with the flow rate of the main cooling system in measurement. There was decay heat capacity of the A-loop and the B-loop in the balance, making the flow rate of the main cooling system of the A-loop positive and supposing that the B-loop is a revision flow rate and as for the heat transfer performance of IHX of the A-loop and the B-loop, the approximately equal thing could be confirmed. As a result, as for the overall heat transfer coefficient of IHX, the A-loop was about 125 \% of the design value, the B-loop was about 129 \% of the design value and it confirmed that two IHX had the performance to be equal and an enough decay heat performance.(3)It made DHX outlet air temperature about 20degree and it calculated DHX outlet air flow from the decay heat capacity from sodium coolant and the DHX outlet air temperature in full power. As a result, DHX could confirm that the decay heat ability to be equivalent to he reactor thermal power in 85 - 90 \% of capacities of design value (6,750m$^{3}$/min) and an enough decay heat performance.
- Source
- /JNC-TN9410-2005-005.pdf （fulltext）