3.9 refueling

Question 1

3.9.7 refueling cavity water lvl

Why is a minimum water level of 23 ‘ above Rx vessel flange required during core alterations?

Answer 1

• Maintain sufficient water level in: cnmt, ref cavity, ref canal, xfr canal and SFP
• water level ensures iodine retention sufficient for refueling accident
• Iodine retention Limits offsite doses < 25% limits in 10 CFR 100