Abstract: After the loss of coolant accident（LOCA） for preventing low pressure safety injection pump or a security shell spray pump function complete failure（H4） beyond design basis accident, design the H4 pipeline, in H4 conditions using still available low pressure safety injection pump or containment spray pump to realize the functions of the reactor core, long-term cooling. Of H4 condition under the safety injection system（RIS） and the containment spray system（EAS） reserve for test, by selecting features: low and high performance of the low pressure safety injection pump and low characteristic of the containment spray pump to verify the parameters in accident conditions can still meet the requirements, at the same time verified to the reactor coolant system（RCP） cooling system, thermal injection, outlet flow of the pump meet the Qinshan nuclear power plant expansion project（Fang Shan nuclear power project） debugging safety standards in the outline.