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UCC28910: Zener Problem in WEBENCH Design

Part Number: UCC28910

I have created a design with the WEBENCH for a AC/DC power supply to output 6Vdc, 0.7A. From the BOM generated, the zener (Dz) required: "VRWM of 324.006V, DCWatts 0.145W"

Is the Vrwm the working voltage of the zener? It seems unrealistic for a zener to be rated for such high Vrwm.

I attached the WEBENCH report here.

Could you give me some recommedation? Thank you.

webench_design_1982740_49_173056153.pdf