(While the chlorine and hydrogen control valves are closed,) open the nitrogen remote control shut-off valve XCV-1103A in the hydrogen inlet pipeline. After blowing for 30 seconds, close the nitrogen remote control shut-off valve XCV-1103A in the hydrogen inlet pipeline, delaying for 30 seconds. Open the nitrogen remote control shut-off valve XCV-1103A in the hydrogen inlet pipeline, and after blowing for 90 seconds, close the nitrogen remote control shut-off valve XCV-1103A in the hydrogen inlet pipeline.