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为了缓解对控制棒导向筒的横向水力载荷，确保控制棒能按指令在导向筒中自由升降和快速下插，结合服役中控制棒导向筒的结构，对上腔室芯部作了如下２种情况的改进：１对原ＰＷＲ靠近上腔室出口管嘴附近的控制棒导向筒组件（对称的４组：０２２６，０３２５，１１２９，１２２８）加设了保护套。２改用３３组控制棒导向筒组件的芯部，且对全部３３组控制棒导向筒组件分别加设保护套。在相同实验条件下，对以上２种改进情况的实验结果与原上腔室的实验结果作了比较分析，得到了这２种改进结构均能缓解流场对控制棒导向筒的水力载荷作用的结论。
In order to relieve the lateral hydraulic load on the guide bar of the control rod and ensure that the control rod can freely move up and down according to the instruction in the guide cylinder and combined with the structure of the control rod guide cylinder in service, Improvement: 1 The original PWR near the upper chamber outlet nozzle near the control rod guide tube assembly (symmetrical 4 groups: 02-26, 03-25, 11-29, 12-28) plus a protective cover. 2 switch to 33 sets of control rod guide tube assembly of the core, and for all 33 sets of control rod guide cylinder assembly were added protective sleeve. Under the same experimental conditions, the experimental results of the above two improvements are compared with the experimental results of the former upper chamber, and the two improved structures are obtained, which can both mitigate the effect of the flow field on the hydraulic load of the control rod guide cylinder in conclusion.