ML062370008

SG Tube Inspection Summary, Table 2 & 3

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: ML062150446 ML062370007 ML062370008
References
Download: ML062370008 (2)

Text

Table 2 DIABLO CANYON UNIT 2 R13 Repairable Indication and Tube Status Report Tube Steam Generator Location Total Degradation 2-1 2-2 2-3 2-4 Number of DIS @ <2v DNT 39 45 66 32 182 (Excludes known flaws)

DIS Overcall Rate 100% 100% 100% 100% 100%

1. 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 GL 95-05 ARC Wedge Region 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 U-bends 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 Total Plugged Tubes 4 22 5 35 66 Numbers reflect the number of tubes affected with degradation, unless (Inds) is noted.

5/2/2006 6:02 PM

Table 3 Most Significant Indications DCPP 2R13 (Preliminary Results)

Bobbin Estimated Estimated Degradation SG Row Col Location +Pt Volts Volts Depth 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 Mixed Mode (ID Axial + Circ) (2) 22 10 30 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.

AREVA Tube Integrity Engineering Daily Results: 5/2/2006 6:04 PM