ML111030188: Difference between revisions

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#REDIRECT [[RS-11-062, Report No. 901348-04, Exelon Relief Request 13R-19, Penetration 64, Page 3 of 4]]
{{Adams
| number = ML111030188
| issue date = 04/08/2011
| title = Enclosure 3 - Dose Estimates
| author name =
| author affiliation = Exelon Generation Co, LLC, Exelon Nuclear
| addressee name =
| addressee affiliation = NRC/NRR
| docket = 05000454
| license number = NPF-037
| contact person =
| case reference number = RS-11-062
| package number = ML111010578
| document type = - No Document Type Applies
| page count = 4
}}
 
=Text=
{{#Wiki_filter:ATTACHMENT 3 DOSE ESTIMATES
 
Dose Pen Ind Character/Loc.           Repair steps        Time        Repair Comments mRem 64  1                Mark indication                6  420 12:00 J-Weld Light Grinding                20  1400  Light Grind to reduce to 3/32" x 1/4" Welding Supv Perform Visual    2  140        acceptable Linear Weld over if depth required Rejectable  Remark Penetration and Clean    3  210 Enter/Exit All Jumps          94  6819 QC inspection @ 5X PT of area  20  1400 64  2                Mark indication                0    0 12:00 J-Weld 1/16" x 1/16" Light Grinding                  0    0  Repaired incidently with #1 Rounded    Welding Supv Perform Visual    2  140 Acceptable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area  1  70 64  3                Mark indication                0    0 11:00                                              Light Grind to reduce to 1/16" x 1/2" Light Grinding                15  1050        acceptable Linear    Welding Supv Perform Visual    2  140 Weld over if depth required Rejectable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area  1  70 64  4                Mark indication                0    0 3:00                                              Light Grind to reduce to 1/4" x 1/4"  Light Grinding                22  1540        acceptable Rounded    Welding Supv Perform Visual    2  140 Weld over if depth required Rejectable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area  1  70 64  5                Mark indication                0    0 3:00 Light Grinding                  0    0      Possibly will be 1/8" x 1/8" Repaired incidently with #1 Rounded    Welding Supv Perform Visual    0    0 Acceptable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area  1  70 64  6                Mark indication                10  700 2:00                                              Light Grind to reduce to 1/8" x 1/2"  Light Grinding                15  1050        acceptable Linear    Welding Supv Perform Visual    2  140 Weld over if depth required Rejectable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area  1  70
 
Dose Pen Ind Character/Loc.          Repair steps        Time        Repair Comments mRem 64  7                Mark indication                0    0 2:00 Light Grinding                15  1050  Light Grind to reduce to 0
acceptable Rounded    Welding Supv Perform Visual    2  140 Weld over if depth required Rejectable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area  1    70 64  8                Mark indication                0    0 5:00 Light Grinding                15  1050  Light Grind to reduce to 1/16" x 3/16" acceptable Linear    Welding Supv Perform Visual    2  140 Weld over if depth required Rejectable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area  1  70 64 9                Mark indication                0    0 6:00 Light Grinding                10  700  Light Grind to reduce to 1/16" x 3/16" acceptable Linear    Welding Supv Perform Visual    2  140 Weld over if depth required Rejectable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area  1  70 31  1                Mark indication                6  420 11:00 Light Grinding                15  1050  Light Grind to reduce to 1/8" x 3/8" acceptable Linear    Welding Supv Perform Visual    2  140 Weld over if depth required Rejectable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area 15.5 1085 31  2                Mark indication                0    0 1:00 Light Grinding                15  1050  Light Grind to reduce to 1/16" x 1" acceptable Linear    Welding Supv Perform Visual    2  140 Weld over if depth required Rejectable Remark Penetration and Clean    3  210 QC inspection @ 5X PT of area  1  70 31  3                Mark indication                0    0 1:00 Light Grinding                15  1050  Light Grind to reduce to 1/4" x 1/4" acceptable Rounded    Welding Supv Perform Visual    2  140 Weld over if depth required Rejectable Remark Penetration and Clean    3   210 QC inspection @ 5X PT of area  1    70
 
Dose Pen    Ind  Character/Loc.              Repair steps          Time                Repair Comments mRem 31    4                       Mark indication                    0        0 8:00 Light Grinding                    22      1540  Local Excavate to reduce to 1/2" x 5/8" acceptable Rounded        Welding Supv Perform Visual        2      140  Weld over if depth required Rejectable Remark Penetration and Clean      3      210 QC inspection @ 5X PT of area      1      70 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.}}

Latest revision as of 01:00, 13 November 2019

Enclosure 3 - Dose Estimates
ML111030188
Person / Time
Site: Byron Constellation icon.png
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)
v • d • e


Text

ATTACHMENT 3 DOSE ESTIMATES

Dose Pen Ind Character/Loc. Repair steps Time Repair Comments mRem 64 1 Mark indication 6 420 12:00 J-Weld Light Grinding 20 1400 Light Grind to reduce to 3/32" x 1/4" Welding Supv Perform Visual 2 140 acceptable Linear Weld over if depth required Rejectable Remark Penetration and Clean 3 210 Enter/Exit All Jumps 94 6819 QC inspection @ 5X PT of area 20 1400 64 2 Mark indication 0 0 12:00 J-Weld 1/16" x 1/16" Light Grinding 0 0 Repaired incidently with #1 Rounded Welding Supv Perform Visual 2 140 Acceptable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70 64 3 Mark indication 0 0 11:00 Light Grind to reduce to 1/16" x 1/2" Light Grinding 15 1050 acceptable Linear Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70 64 4 Mark indication 0 0 3:00 Light Grind to reduce to 1/4" x 1/4" Light Grinding 22 1540 acceptable Rounded Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70 64 5 Mark indication 0 0 3:00 Light Grinding 0 0 Possibly will be 1/8" x 1/8" Repaired incidently with #1 Rounded Welding Supv Perform Visual 0 0 Acceptable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70 64 6 Mark indication 10 700 2:00 Light Grind to reduce to 1/8" x 1/2" Light Grinding 15 1050 acceptable Linear Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70

Dose Pen Ind Character/Loc. Repair steps Time Repair Comments mRem 64 7 Mark indication 0 0 2:00 Light Grinding 15 1050 Light Grind to reduce to 0

acceptable Rounded Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70 64 8 Mark indication 0 0 5:00 Light Grinding 15 1050 Light Grind to reduce to 1/16" x 3/16" acceptable Linear Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70 64 9 Mark indication 0 0 6:00 Light Grinding 10 700 Light Grind to reduce to 1/16" x 3/16" acceptable Linear Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70 31 1 Mark indication 6 420 11:00 Light Grinding 15 1050 Light Grind to reduce to 1/8" x 3/8" acceptable Linear Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 15.5 1085 31 2 Mark indication 0 0 1:00 Light Grinding 15 1050 Light Grind to reduce to 1/16" x 1" acceptable Linear Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70 31 3 Mark indication 0 0 1:00 Light Grinding 15 1050 Light Grind to reduce to 1/4" x 1/4" acceptable Rounded Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70

Dose Pen Ind Character/Loc. Repair steps Time Repair Comments mRem 31 4 Mark indication 0 0 8:00 Light Grinding 22 1540 Local Excavate to reduce to 1/2" x 5/8" acceptable Rounded Welding Supv Perform Visual 2 140 Weld over if depth required Rejectable Remark Penetration and Clean 3 210 QC inspection @ 5X PT of area 1 70 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.

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