Abstract: The crucible for vacuum electron beam melting works in high vacuum and high temperature environment, and needs to be cooled sufficiently to ensure its normal operation. The closed cycle water supply device for crucible cooling is non-nuclear safety seismic category equipment with special requirements. It must be ensured that the device is undamaged and can supply water normally under earthquake conditions. Therefore, it is great useful to do anti-seismic analysis. The frame of equipment is the most important part in anti-seismic analysis. Based on ANSYS, the modal of frame was calculated, the seismic performance was analyzed with response spectrum analysis method. The safety capability of the frame under earthquake load is evaluated, which provides a reference for anti-seismic design and seismic experiment of the device. The research results have important reference for production practice.

Key words: vacuum electron beam, crucible cooling, frame, aseismic capacity