ML091490356
| ML091490356 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 05/06/2009 |
| From: | NRC Region 1 |
| To: | |
| References | |
| FOIA/PA-2009-0070 | |
| Download: ML091490356 (1) | |
Text
Oyster Creek Drywell License Renewal ISI Commitments Lower Drywell Shell External UT (in Sand Bed Bays)
[IS-328227-004, 3.2.3]
Commitment 27, Item (9, 14, & 21) 106 UT readings, in the 10 sand bed bays [external UT] [IS-328227-004, 3.2.8]
Acceptance Criteria > 0.582" based on 2006 min recorded value minus 20 mil tolerance Min Required Code Thickness Transitions from 0.536" in a localized 1 ft2 area within a 3 ft2 area to 0.736" at the boundary of the 3 ft2 area Lower Drywell Shell Internal UT (at Sand Bed Region elevations)
[IS-328227-004, 3.2.2]
Commitment 27, Item (1 & 21) 12 locations are 7x7 arrays over a 6"x6" area [49 UT readings in each area]
7 locations are 1x7 arrays, on 1" increments [7 UT readings in each area]
Acceptance Criteria (1) each reading > 0.628" based on 2006 min recorded value minus 20 mil tolerance, and (2) average value for each airray within 20 mils of the 2006 average values Min Required Code Thickness (1) > 0.736" min average thickness, based on uniform thickness used in GE analysis.(CLB), and (2) Ž- 0.490" in a locally thinned area 2" in diameter Drywell Floor Inspection Access Trenches UT (Bay 5 & 17)
[IS-328227-004, 3.2.6]
Commitment 27, Item (5, 16, & 20)
Remove & reinstall lower 6" of grout at bottom of Bay 5 trench Acceptance Criteria each reading > 0.682" based on 2006 min recorded value minus 20 mil tolerance
?? Min Required Code Thickness (1) > 0.736" min average thickness, based on uniform thickness used in GE analysis (CLB), and (2) > 0.490" in a locally thinned area 2" in diameter
>>> ?? is an average taken and evaluated ??
Lower Drywell Shell UT at Elev 23' (lower to middle spherical plates)
[IS-328227-004, 3.2.
Commitment 27, Item (10) >> 4 locations using a 6"x6" qrid Transition from 0.770" lower spherical plate to 1.154" middle spherical plate 4 locations using a dynamic scan of a 6"x6" area Acceptance Criteria each reading -> 0.847" (for 1.154" plate) or-2 0.628" (for 0.770" plate), based on 2006 min recorded values minus 20 mil tolerance Min Required Code Thickness ???
Upper Drywell Shell UT at Elev 71' (knuckle region)
[IS-328227-004, 3.2.
Commitment 27, Item (11)
>> 4 locations using a 6"x6" qrid Transition from 2.625" knuckle plate to 0.640" cylinder plate 4 locations using a dynamic scan of a 6"x6" area Acceptance Criteria each reading -> 2.408" (for 2.625" plate) or - 0.429" (for 0.640" plate), based on 2006 min recorded values minus 20 mil tolerance Min Required Code Thickness ???
7]
8]
Upper Drywell Shell UT at Various Elevations
[IS-328227-004, 3.2.1]
Commitment 27, Item (7) 9 locations using a 7x7 arrays, at elev. 50', 51', 60', and 87' Acceptance Criteria each reading -> the 2006 min recorded value minus 20 mil tolerance (see table)
Min Required Code Thickness ???