KHNP had licensed Dynamic Control rod Reactivity Measurement (DCRM) method using detector current signals of PWRs in 2006. The method has been applied to all PWRs in Korea for about 15 years successfully. However, the original method was inapplicable to PWRs using low-sensitivity integral fission chamber as ex-core detectors because of their pulse pile-up and the nonlinearity of the mean-square voltage at low power region. Therefore, to overcome this disadvantage, a modified method, DCRM-EK, was developed using kinetics behavior after equilibrium condition where the pulse counts maintain the maximum value before pulse pile-up. Overall measurement, analysis procedure, and related computer codes were changed slightly to reflect the site test condition. The new method was applied to a total of 15 control rods of 1000 MWe and 1400 MWe PWRs in Korea with worths in the range of 200 pcm–1200 pcm. The results show the average difference of -0.4% and the maximum difference of 7.1% compared to the design values. Therefore, the new DCRM-EK will be applied to PWRs using low sensitivity integral fission chambers, and also can replace the original DCRM when the evaluation fails by big noises present in current or voltage signals of uncompensated/compensated ion chambers.

KHNP 于 2006 年获得了使用 PWR 探测器电流信号的动态控制棒反应性测量 (DCRM) 方法的许可。该方法已成功应用于韩国所有 PWR 约 15 年。然而，由于脉冲堆积和低功率区域均方电压的非线性，原始方法不适用于使用低灵敏度整体裂变室作为堆外探测器的压水堆。因此，为了克服这个缺点，开发了一种改进的方法，DCRM-EK，它使用平衡条件后的动力学行为，其中脉冲计数在脉冲堆积之前保持最大值。整体测量、分析程序和相关的计算机代码略有改变，以反映现场测试条件。新方法应用于韩国共 15 条 1000 MWe 和 1400 MWe PWR 的控制棒，价值范围为 200 pcm-1200 pcm。结果显示，与设计值相比，平均差异为 -0.4%，最大差异为 7.1%。因此，新的 DCRM-EK 将应用于使用低灵敏度整体裂变室的 PWR，也可以在未补偿/补偿离子室的电流或电压信号中存在大噪声导致评估失败时替代原来的 DCRM。