ML25240B633
| ML25240B633 | |
| 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: ML25240B633 (1) | |
Text
Table 3-2 (page 1 of 2)
Table 3-2 summarizes the inputs and outputs for the calculation of through-wall cracking frequency (TWCF).
Table 3-2: Details of TWCF Calculation for Calvert Cliffs Unit 2 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-8905-1 C-5312-1 0.15 0.52 1.1 105.6
-20 1.64E+18 2
Upper Shell Plate D-8905-2 C-5312-2 0.15 0.52 1.1 105.6
-20 3
Upper Shell Plate D-8905-3 C-5286-2 0.15 0.605 1.1 110.13
-20 4
Intermediate Shell Plate D-8906-1 A-4463-1 0.15 0.56 1.1 108 10 5.07E+19 5
Intermediate Shell Plate D-8906-2 B-9427-2 0.11 0.56 1.1 74 10 6
Intermediate Shell Plate D-8906-3 A-4463-2 0.14 0.55 1.1 98 5
7 Lower Shell Plate D-8907-1 C-5804-1 0.15 0.60 1.1 110
-8 5.07E+19 8
Lower Shell Plate D-8907-2 C-5286-1 0.14 0.66 1.1 101.5 20 9
Lower Shell Plate D-8907-3 C-5803-3 0.11 0.74 1.1 77
-16 10 Upper to Intermediate Shell Weld Seam 8-203 33A277 0.258 0.165 1.1 126.26
-80 1.87E+18 11 Inter. Shell to Lower Shell Weld Seam 9-203 10137 0.21 0.06 1.1 96.8
-60 5.01E+19 12 Upper Shell Long. Weld 1-203 A 21935/12008 0.22 0.86 1.1 209.6
-50 1.64E+18 13 Upper Shell Long. Weld 1-203 B 21935 0.18 0.72 1.1 173.8
-56 1.64E+18 14 Upper Shell Long. Weld 1-203 C 21935 0.18 0.72 1.1 173.8
-56 1.64E+18 15 Inter. Shell Long. Weld 2-203 A A8746 0.16 0.10 1.1 79
-56 5.07E+19 16 Inter. Shell Long. Weld 2-203 B A8746 0.16 0.10 1.1 79
-56 5.07E+19 17 Inter. Shell Long. Weld 2-203 C A8746 0.16 0.10 1.1 79
-56 5.07E+19 18 Lower Shell Long. Weld 3-203 A 33A277 0.24 0.16 1.1 117.8
-80 5.07E+19 19 Lower Shell Long. Weld 3-203 B 33A277 0.24 0.16 1.1 117.8
-80 5.07E+19 20 Lower Shell Long. Weld 3-203 C 33A277 0.24 0.16 1.1 117.8
-80 5.07E+19
Table 3-2 (page 2 of 2)
Table 3-2: Details of TWCF Calculation for Calvert Cliffs Unit 2 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 8
2.5000 622.28 5.07E+19 1.4051 142.61 8.503E-13 Limiting Plate - PL 8
2.5000 622.28 5.07E+19 1.4051 142.61 1.405E-10 Limiting Circumferential Weld - CW 8
2.5000 622.05 5.01E+19 1.4027 142.38 1.032E-20 TWCF95-TOTAL = (AWTWCF95-AW + PLTWCF95-PL + CWTWCF95-CW):
3.53E-10 Note (1) Material properties and fluence were based on the Calvert Cliffs Comprehensive Reactor Vessel Surveillance Program (Reference 14) and WCAP-18958-NP (Reference 12).
Material properties not included in Reference 12 and Reference 14 are in Reference 15.