ML062370008
| ML062370008 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/02/2006 |
| From: | NRC/NRR/ADRO/DORL/LPLIV |
| To: | |
| Wang, A., DORL/LPLIV, 415-1445 | |
| Shared Package | |
| ML062370004 | List: |
| References | |
| Download: ML062370008 (2) | |
Text
Table 2 Repairable Indication and Tube Status Report Tube Degradation 2-1 2-2 2-3 2-4 Number of DIS @ <2v DNT (Excludes known flaws) 39 45 66 32 182 DIS Overcall Rate 100%
100%
100%
100%
100%
- of Confirmed SAI-ID in Above DIS 0
0 0
0 0
Axial PWSCC (New Inds) 2 2
4 Axial PWSCC (Repeat Inds) 44 4
5 53 DENTED TSP Wedge Region Axial ID/Axial OD 2
2 Circ PWSCC 1
1 Circ ODSCC 10 10 Mixed Mode Axial OD/Circ Mixed Mode Axial ID/Circ 2
2 Fail PWSCC ARC OA Burst Fail PWSCC ARC DOP >=40% TW 2
2 Repairable Tubes 0
14 0
3 17 DOS > 2.0 V (Inds) 2 1
3 26 32 DOS =< 2.0 V (Inds) 528 434 319 1163 2444 TSP ODSCC AONDB @ >5 V Dent 2
2 Preventive Plugging <2v DOS 1
1 Repairable Tubes 2
3 3
29 37 Axial PWSCC (New) 2 2
Axial PWSCC (Repeat) 15 5
20 26 66 Axial PWSCC Failed W* Criteria 1
2 3
Tubesheet Circ PWSCC @ TTS Circ ODSCC @ TTS 1
1 2
Repairable Tubes 1
1 1
2 5
Circ PWSCC 1
1 1
3 Outermost Row with Degradation R7 R7 R8 High Row U-bends AVB Wear >=40%
1 1
Cold Leg Thinning Thinning >=40%
2 2
PLP/FO Wear Indications Freespan Axial ODSCC at Straight Leg Ding 1
1 Misc.
Preventive Plugged Tubes 4
22 5
35 66 Numbers reflect the number of tubes affected with degradation, unless (Inds) is noted.
DIABLO CANYON UNIT 2 R13 U-bends Steam Generator Total Location Total 5/2/2006 6:02 PM
Degradation SG Row Col Location Bobbin Volts
+Pt Volts Estimated Depth Estimated Length AVB Wear 22 23 53 7H + 60.81 1.91 40%TW Cold Leg Thinning 22 42 33 2C - 0.20 3.87 46%TW Axial ODSCC @ Ding 22 23 51 TSC + 39.84 0.82 25%TW 0.44 Circ PWSCC in Ubend 24 8
25 7H + 38 0.79 66%TW (1) 18.5 deg Axial PWSCC @ Dented TSP 22 6
31 1H - 0.33 1.36 60%TW 0.25" Circ PWSCC @ Dented TSP 24 11 16 3H - 0.18 0.44 79%TW (1) 25.9 deg Circ: 1H + 0.05 0.16 40%TW 24.9 deg Axial: 1H -0.3 to -0.7 0.47 48%TW 0.13" Axial ODSCC @ TSP 24 7
78 3H - 0.10 4.16 2.89 Circ ODSCC @ TSP 22 17 29 4H - 0.08 0.57 39%TW (1) 25.4 deg Circ ODSCC @ Tubesheet 22 22 24 TSH - 0.05 0.16 TBD TBD Axial PWSCC @ Tubesheet (W*)
21 7
62 TSH - 1.87 4.91 TBD 0.92 Note: Significance for SCC Indications determined by +Point Voltage, except for bobbin coil ARC, AVB Wear and CLT.
(1) Estimated depth is at maximum +Point amplitude.
(2) Separation distance is 0.24", therefore defined as "interacting", per PWSCC ARC criteria.
DCPP 2R13 (Preliminary Results)
Most Significant Indications Table 3 Mixed Mode (ID Axial + Circ) (2) 22 10 30 AREVA Tube Integrity Engineering Daily Results: 5/2/2006 6:04 PM