>>16727284
Steam parameters:
5.1MPa, 480C, 1770t/h
3.8MPa, 340C, 779.5t/h
2.8MPa, 340C, 1552.5t/h

See the diagram of phase 1
Source (page 273)
https://www.mee.gov.cn/ywdt/gsgg/gongshi/wqgs_1/202307/W020230705398788877470.pdf

Phase 1 has two HPR1000 units (each with 1 reactor and 3 steam generators) and one HTR-PM600S unit (with 6 reactors and 6 steam generators). Phase 2 will be an identical copy of phase 1.

I think an ethylene cracker operates at temperatures in the range of 750-950C, however the gap can be bridged by other means of heating, and there will be other processes in the plant that require lower grade heat

The primary coolant circuit outlet temperature of a HTR-PM reactor is 750C, so that is the theoretical maximum temperature anything can be heated to. However, I think that in practice it is not feasible to heat steam to such high temperatures. As can be seen in the diagram, the steam coming out of the steam generators in the HTR-PM600S reactor building is at 536C