ML25240B632
| ML25240B632 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/28/2025 |
| From: | Constellation Energy Generation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML25240B627 | List: |
| References | |
| Download: ML25240B632 (1) | |
Text
Tab1e 3-1 (page 1 of 2)
Table 3-1 summarizes the inputs and outputs for the calculation of through-wall cracking frequency (TWCF).
Table 3-1: Details of TWCF Calculation for Calvert Cliffs Unit 1 at 60 Effective Full Power Years (EFPY)
Inputs(1)
Inter. & Lower Shell Twall [inches]:
8.625 Upper Shell Twall [inches]:
10.75 No.
Region and Component Description Material Heat No.
Identification Copper
[weight %]
[weight %]
R.G. 1.99 Position Chemistry Factor
[ºF]
RTNDT(u)
[ºF]
Fluence
[Neutron/cm2, E > 1.0 MeV]
1 Upper Shell Plate D-7205-1 C-4423-2 0.15 0.57 1.1 109 11 1.44E+18 2
Upper Shell Plate D-7205-2 C-4679-2 0.15 0.51 1.1 105.05 10 3
Upper Shell Plate D-7205-3 C-4420-2 0.15 0.54 1.1 107 10 4
Intermediate Shell Plate D-7206-1 C-4351-2 0.11 0.55 1.1 74 20 4.78E+19 5
Intermediate Shell Plate D-7206-2 C-4441-2 0.12 0.64 2.1 84
-30 6
Intermediate Shell Plate D-7206-3 C-4441-1 0.12 0.64 2.1 92.6 10 7
Lower Shell Plate D-7207-1 C-4420-1 0.13 0.54 1.1 90 10 4.79E+19 8
Lower Shell Plate D-7207-2 B-8489-2 0.12 0.55 1.1 82
-10 9
Lower Shell Plate D-7207-3 B-8489-1 0.11 0.53 1.1 74
-20 10 Upper to Intermediate Shell Weld Seam 8-203 1P2809 0.27 0.735 1.1 205.6
-56 1.63E+18 11 Inter. Shell to Lower Shell Weld Seam 9-203 33A277 0.24 0.16 1.1 117.8
-80 4.75E+19 12 Upper Shell Long. Weld 1-203 A 20291/12008 0.199 0.846 1.1 200.37
-50 1.44E+18 13 Upper Shell Long. Weld 1-203 B 20291/12008 0.199 0.846 1.1 200.37
-50 1.44E+18 14 Upper Shell Long. Weld 1-203 C 20291/12008 0.199 0.846 1.1 200.37
-50 1.44E+18 15 Inter. Shell Long. Weld 2-203 A 12008/20291 0.22 0.83 1.1 204.8
-50 4.78E+19 16 Inter. Shell Long. Weld 2-203 B 12008/20291 0.22 0.83 1.1 204.8
-50 4.78E+19 17 Inter. Shell Long. Weld 2-203 C 12008/20291 0.22 0.83 1.1 204.8
-50 4.78E+19 18 Lower Shell Long. Weld 3-203 A 21935 0.18 0.72 1.1 174
-56 4.79E+19 19 Lower Shell Long. Weld 3-203 B 21935 0.18 0.72 1.1 174
-56 4.79E+19 20 Lower Shell Long. Weld 3-203 C 21935 0.18 0.72 1.1 174
-56 4.79E+19
Tab1e 3-1 (page 2 of 2)
Table 3-1: Details of TWCF Calculation for Calvert Cliffs Unit 1 at 60 Effective Full Power Years (EFPY)
Outputs Methodology Used to Calculate T30: Regulatory Guide 1.99, Revision 2 (Reference 13)
Controlling Material Region No.
XX RTMAX-XX
[°R]
Fluence
[Neutron/cm2, E >1.0 MeV]
FF (Fluence Factor)
T30 [ºF]
TWCF95-XX Limiting Axial Weld - AW 15, 16, 17 2.0798 695.04 4.78E+19 1.3934 285.37 7.388E-08 Limiting Plate - PL 6
2.5000 598.70 4.78E+19 1.3934 129.03 2.313E-11 Circumferential Weld - CW 6
2.5000 598.58 4.75E+19 1.3921 128.91 0.000E+00 TWCF95-TOTAL = (AWTWCF95-AW + PLTWCF95-PL + CWTWCF95-CW):
1.54E-07 Note (1) Material properties and fluence were based on the Calvert Cliffs Comprehensive Reactor Vessel Surveillance Program ((Reference 14) and WCAP-18624-NP (Reference 11).
Material properties not included in Reference 11 and Reference 14 are in Reference 15.