effective delayed neutron fraction

简明释义

有效缓发中子份额

英英释义

例句

1.The effective delayed neutron fraction 有效延迟中子分数 is an important parameter in the design of fast reactors.

在快中子反应堆的设计中，有效延迟中子分数 有效延迟中子分数 是一个重要参数。

2.The calculation of the effective delayed neutron fraction 有效延迟中子分数 is crucial for reactor safety analysis.

对反应堆安全分析来说，有效延迟中子分数 有效延迟中子分数 的计算至关重要。

3.Engineers must ensure that the effective delayed neutron fraction 有效延迟中子分数 remains within acceptable limits during operation.

工程师必须确保在运行期间，有效延迟中子分数 有效延迟中子分数 保持在可接受的范围内。

4.A higher effective delayed neutron fraction 有效延迟中子分数 can improve the stability of the nuclear reactor.

更高的 有效延迟中子分数 有效延迟中子分数 可以提高核反应堆的稳定性。

5.Researchers are studying the effects of fuel composition on the effective delayed neutron fraction 有效延迟中子分数 to enhance reactor performance.

研究人员正在研究燃料成分对 有效延迟中子分数 有效延迟中子分数 的影响，以提高反应堆性能。

作文

In the field of nuclear engineering, understanding the various parameters that influence reactor behavior is crucial for ensuring safety and efficiency. One such important parameter is the effective delayed neutron fraction, which plays a significant role in the dynamics of nuclear fission processes. To grasp the importance of this concept, we must first delve into what delayed neutrons are and why they matter in the context of nuclear reactors.Delayed neutrons are the neutrons emitted by fission products after a certain delay following the initial fission event. Unlike prompt neutrons, which are released instantly during the fission process, delayed neutrons are emitted from the decay of radioactive isotopes produced when a heavy nucleus splits. This delay can range from fractions of a second to several minutes, depending on the isotopes involved. The presence of these delayed neutrons is critical because they provide a time window for reactor control systems to respond to changes in reactor conditions. The effective delayed neutron fraction refers to the proportion of neutrons that are delayed and effectively contribute to the reactivity of the reactor. It is a vital parameter that affects how quickly a reactor can respond to changes in power demand. A higher effective delayed neutron fraction means that there are more delayed neutrons available to help control the fission reaction, leading to a more stable reactor operation. Conversely, a lower fraction indicates that the reactor may become less stable and more difficult to control, potentially leading to unsafe conditions.One of the key reasons why the effective delayed neutron fraction is essential is its impact on the reactor's feedback mechanisms. In a well-designed reactor, the feedback from delayed neutrons allows for a smoother transition between different power levels. When the reactor’s power increases, the production of delayed neutrons provides a natural lag that helps prevent rapid fluctuations in power output. This characteristic is particularly important during start-up and shutdown operations, where precise control is necessary to avoid overheating or other dangerous situations.Moreover, the effective delayed neutron fraction varies depending on the type of nuclear fuel used and the design of the reactor. For instance, reactors using uranium fuel typically have a higher fraction compared to those using plutonium. Understanding these differences is crucial for reactor designers and operators to ensure optimal performance and safety.In conclusion, the effective delayed neutron fraction is a fundamental concept in nuclear reactor physics that significantly influences reactor dynamics and safety. By allowing for better control over the fission process, it ensures that reactors can operate efficiently and safely under varying conditions. As nuclear technology continues to evolve, a comprehensive understanding of parameters like the effective delayed neutron fraction will be essential for advancing reactor designs and improving safety protocols in the nuclear industry.

在核工程领域，理解影响反应堆行为的各种参数对于确保安全和效率至关重要。其中一个重要参数是有效延迟中子分数，它在核裂变过程的动态中起着重要作用。要理解这一概念的重要性，我们首先必须深入了解什么是延迟中子以及它们在核反应堆中的重要性。延迟中子是指在初始裂变事件后，由裂变产物发射的中子。这些中子与裂变过程中即时释放的快中子不同，延迟中子是由裂变产生的放射性同位素衰变后释放的。这种延迟可以从几分之一秒到几分钟不等，具体取决于所涉及的同位素。这些延迟中子的存在至关重要，因为它们为反应堆控制系统提供了一个响应反应堆条件变化的时间窗口。有效延迟中子分数是指延迟中子在反应堆反应性中有效贡献的比例。这是一个重要的参数，影响反应堆对功率需求变化的响应速度。较高的有效延迟中子分数意味着有更多的延迟中子可以帮助控制裂变反应，从而导致反应堆操作更加稳定。相反，较低的分数则表明反应堆可能变得不那么稳定，更难以控制，可能导致不安全的情况。有效延迟中子分数之所以重要，主要是因为它对反应堆的反馈机制的影响。在设计良好的反应堆中，来自延迟中子的反馈使不同功率水平之间的过渡更加平稳。当反应堆的功率增加时，延迟中子的产生提供了一个自然的滞后，有助于防止功率输出的快速波动。这一特性在启动和关闭操作中尤其重要，在这些情况下，需要精确控制以避免过热或其他危险情况。此外，有效延迟中子分数根据使用的核燃料类型和反应堆的设计而有所不同。例如，使用铀燃料的反应堆通常具有比使用钚的反应堆更高的比例。理解这些差异对于反应堆设计师和操作员确保最佳性能和安全至关重要。总之，有效延迟中子分数是核反应堆物理学中的一个基本概念，对反应堆的动态和安全性有重大影响。通过允许对裂变过程进行更好的控制，它确保反应堆能够在不同条件下高效、安全地运行。随着核技术的不断发展，对如有效延迟中子分数等参数的全面理解将对推动反应堆设计和改善核工业安全协议至关重要。