试描述容积和硼控制系统（KBA）提供的轴封注入水的流程。
参考答案：
在正常运行期间，密封水来自于冷却剂备用下泄热交换器KBA40AC001后的DN50的冷却剂备用下泄管线，如果该管线出现故障，系统还设有从正常下泄管线来的密封水输送备用管线，密封水取自下泄后冷却器KBAl0AC002，每台主泵轴封水用量为0.9～1.2m3/h。如果该两管线出现故障，由上充泵出口压力集管供密封水。在正常工况下，反应堆冷却剂泵轴封回流被排到KBA系统的补给水除气器。如果该管线出现故障，可将轴封回流排到反应堆厂房设备疏水系统（KTA.。
| Reading comprehension. | |
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