ML111030188
| ML111030188 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 04/08/2011 |
| From: | Exelon Generation Co, Exelon Nuclear |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML111010578 | List: |
| References | |
| RS-11-062 | |
| Download: ML111030188 (4) | |
Text
ATTACHMENT 3 DOSE ESTIMATES
Pen Ind Character/Loc. Repair steps Time Dose mRem Repair Comments 64 1 Mark indication 6 420 Light Grinding 20 1400 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 Enter/Exit All Jumps 94 6819 12:00 J-Weld 3/32" x 1/4" Linear Rejectable QC inspection @ 5X PT of area 20 1400 Light Grind to reduce to acceptable Weld over if depth required 64 2 Mark indication 0 0 Light Grinding 0 0 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 12:00 J-Weld 1/16" x 1/16" Rounded Acceptable QC inspection @ 5X PT of area 1 70 Repaired incidently with #1 64 3 Mark indication 0 0 Light Grinding 15 1050 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 11:00 1/16" x 1/2" Linear Rejectable QC inspection @ 5X PT of area 1 70 Light Grind to reduce to acceptable Weld over if depth required 64 4 Mark indication 0 0 Light Grinding 22 1540 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 3:00 1/4" x 1/4" Rounded Rejectable QC inspection @ 5X PT of area 1 70 Light Grind to reduce to acceptable Weld over if depth required 64 5 Mark indication 0 0 Light Grinding 0 0 Welding Supv Perform Visual 0 0 Remark Penetration and Clean 3 210 3:00 1/8" x 1/8" Rounded Acceptable QC inspection @ 5X PT of area 1 70 Possibly will be Repaired incidently with #1 64 6 Mark indication 10 700 Light Grinding 15 1050 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 2:00 1/8" x 1/2" Linear Rejectable QC inspection @ 5X PT of area 1 70 Light Grind to reduce to acceptable Weld over if depth required
Pen Ind Character/Loc. Repair steps Time Dose mRem Repair Comments 64 7 Mark indication 0 0 Light Grinding 15 1050 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 2:00 0 Rounded Rejectable QC inspection @ 5X PT of area 1 70 Light Grind to reduce to acceptable Weld over if depth required 64 8 Mark indication 0 0 Light Grinding 15 1050 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 5:00 1/16" x 3/16" Linear Rejectable QC inspection @ 5X PT of area 1 70 Light Grind to reduce to acceptable Weld over if depth required 64 9 Mark indication 0 0 Light Grinding 10 700 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 6:00 1/16" x 3/16" Linear Rejectable QC inspection @ 5X PT of area 1 70 Light Grind to reduce to acceptable Weld over if depth required 31 1 Mark indication 6 420 Light Grinding 15 1050 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 11:00 1/8" x 3/8" Linear Rejectable QC inspection @ 5X PT of area 15.5 1085 Light Grind to reduce to acceptable Weld over if depth required 31 2 Mark indication 0 0 Light Grinding 15 1050 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 1:00 1/16" x 1" Linear Rejectable QC inspection @ 5X PT of area 1 70 Light Grind to reduce to acceptable Weld over if depth required 31 3 Mark indication 0 0 Light Grinding 15 1050 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 1:00 1/4" x 1/4" Rounded Rejectable QC inspection @ 5X PT of area 1 70 Light Grind to reduce to acceptable Weld over if depth required
Pen Ind Character/Loc. Repair steps Time Dose mRem Repair Comments 31 4 Mark indication 0 0 Light Grinding 22 1540 Welding Supv Perform Visual 2 140 Remark Penetration and Clean 3 210 8:00 1/2" x 5/8" Rounded Rejectable QC inspection @ 5X PT of area 1 70 Local Excavate to reduce to acceptable Weld over if depth required Total REM 28..554 Assumptions:
Only covers penetration 64 and 31 Both options include grinding on 64-4 and 31-4 (pen-Indication)
Both options include weld repair (overlay) on all indications in 64 and 31 No extra time for chasing indications after grinding
Actuals for dose used: Dose at head 70 mrem/min Dose in and out 36 mrem/min Dose on turnovers .1 mrem/min
==
Conclusions:==
Relief request will yield a 7 REM savings for pen 64 and 31 MINIMUM
Additional saving should be less for the remaining penetrations since we expect less indication repair.
Overall savings of approx 35% in dose.