The power coefficient of reactivity (PCR) is a measure of whether a particular reactor's nuclear neutron population will tend to increase or decrease after an increase in the reactor's power.

PCR是一座反应堆的核中子数会在反应堆能量增加后增加或减少的衡量标志。

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And basically it says that if you have core a design you wanna be able to make sure that the inherent nuclear feedback characteristics can deal with and compensate for prompt reactivity excursions.

基本上也就是假如你有一个核心设计，你想能够保证固有的，核反馈的特点是能够处理，并补偿即时反应骤增。

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The cruciform control rod controlling is the main method to control reactivity in the nuclear heating reactor (NHR).

核供热反应堆的过剩反应性主要靠十字形控制棒来控制。

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