TIME BEHAVIOR OF GODIVA THROUGH PROMPT CRITICAL
TIME BEHAVIOR OF GODIVA THROUGH PROMPT CRITICAL
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GODIVA 的及时行为至关重要
DOI：
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发表时间：
1956
期刊：
影响因子：
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通讯作者：
J. D. Orndoff
中科院分区：
文献类型：
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作者：
T. Wimett;L. B. Engle;G. Graves;G. R. Keepin;J. D. Orndoff
研究了裸球形 U/sup 235/金属组件 (Godiva) 在反应性突然增加、初始功率水平基本为零且没有外部中子源的情况下的时间行为。在受控条件下达到的最高最终反应性比即时临界值高出约 10 美分。在高于提示临界值的区域中，观察到的裂变速率呈指数增加，直到热膨胀引起的反应性降低导致其通过钟形最大值或“爆发”。在这次爆发之后，裂变速率下降到由延迟中子维持的低振幅“尾部”，并最终在组件自动紧急扰动时终止。观察到与 10,000 Mw 瞬时功率水平相对应的突发幅度，持续时间低于一毫秒。测量的反应堆周期与基于最近的延迟中子数据的计算之间发现了极好的一致性。总体爆发行为也被发现与基于空间无关单群模型的理论一致。 （授权）
Studies were made of the time behavior of a bare spherical U/sup 235/ metal assembly (Godiva) following sudden increases in reactivity with essentially zero initial power level and no external neutron source. The highest final reactivity attained under controlled conditions was about 10 cents above prompt critical. In the region above prompt critical the observed fission rate increased exponentially until the decreasing reactivity from thermal expansion caused it to pass through a bell-shaped maximum or "burst." Following this burst, the fission rate dropped to a low-amplitude "tail" sustained by delayed neutrons and finally terminated upon automatic scramming of the assembly. Burst amplitudes corresponding to instantaneous power levels of 10,000 Mw were observed with durations under a millisecond. Excellent agreement was found between measured reactor periods and calculations based on recent delayed neutron data. Over-all burst behavior also was found to agree with theory based on a space independent one-group model. (auth)