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題名 | Ramp Reactivity Insertion Limits in a Typical Pool-Type Research Reactor=典型水池式研究反應器中反應度之傾斜輸入極限 |
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作者姓名(外文) | Khan,Rubina; Mirza,Nasir M.; Mirza,Sikander M.; | 書刊名 | 核子科學 |
卷期 | 36:1 1999.02[民88.02] |
頁次 | 頁27-41 |
分類號 | 449.2 |
關鍵詞 | 典型水池式研究反應器; 反應度; 傾斜輸入極限; Computer simulations; Research reactors; Ramp reactivity insertion limits; |
語文 | 英文(English) |
英文摘要 | Reactivity insertion limits imposed by clad melting temperature in a typical pool-type research reactor have been determined. Simulation were conducted using modified PARET code for high enriched uranium (HEU), low enriched uranium oxide (LOX) and low enriched uranium (LEU) cores having UAl□-Al, U□O□-Al and U□Si□-Al fuels respectively. Reactivity insertions were idealized by ramps. Super prompt-critical transients of more than $1 were selected. The reactor was kept initially critical and at a very low power. Transients were simulated with and without scram condition. The fuel, clad and coolant temperatures along with power & reactivity behavior during the transient of less than one second have been simulated. Oscillations in the reactor power after a primary peak are seen during these transients. A secondary peak is also observed after the primary peak. Also, oscillations in the fuel and clad temperatures are observed for ramp reactivity insertions of more than $1.5 per 0.5 sec. Clad meltdown has been found for a ramp reactivity insertion of $2.0 per 0.5 sec at 0.785 sec in case of HEU core. The clad melts for $1.9 per 0.5 sec in case of LOX core at 0.968 sec. For LEU core the clad melting occurs for $2.2 per 0.5 sec ramp at 0.679 sec. The behavior of the LEU core with scram enabled when power reaches 12 MW value has also been studied. In this case the clad melts at reactivity ramp rates higher than $6.5 per 0.5 sec. These investigations show that a secondary energy peak within 0.1 second of the primary peak causes a non-linear rise in temperatures within the fuel which can lead to the clad meltdown. When LEU core is allowed to scram at 12 MW, the influence of large Doppler Coefficient is over-shadowed by the negative reactivity insertion of control rods. |
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