Text

Diablo Canyon, Unit 2 - Relief Request SWOL-REP-1-U2: Submittal of Revised Areva Calculations. Part 4 of 15
	ML14259A307
Person / Time
Site:	Diablo Canyon
Issue date:	09/15/2014
From:	; AREVA
To:	; Office of Nuclear Reactor Regulation
Shared Package
ML14259A323	List: DCL-14-084, Relief Request SWOL-REP-1-U2: Submittal of Revised Areva Calculations. Part 7 of 15; ML14259A226; ML14259A298; ML14259A302; ML14259A307; ML14259A312; ML14259A314;
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	DCL-14-084 32-9219780-002, 32-9219813-002
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Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 27 Time Points of Interest for the LOF Transients

--Table 28 Time Points of Interest for the RT Transients ----Table 29 Time Points of Interest for the TRT Transients

---Page 58 Document A AREV.A Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 30 Time Points of Interest for the IASA Transients

--Table 31 Time Points of Interest for the SVO Transients

--Page 59 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary 5.4 ASME Code Criteria The AS:ME Code qualification involves two basic sets of criteria:

1) Assure that failure does not occur due to application of the design loads. 2) Assure that failure does not occur due to repetitive

-loadings.

In general, the primary stress intensity criteria of the ASME Code (Reference

[3]) assure that the design is adequate for application of design loads. The AS:ME Code criteria for cumulative fatigue usage factor assure that the design is adequate for repetitive loadings.

5.4.1 ASME Code Primary Stress Intensity

{51) Criteria Per NB-3213.8 of References

[3], the primary stresses are those normal or shear stresses developed by an imposed loading such as internal pressure and external loadings.

A thermal stress is not classified as a primary stress. The classification as well as the limit of primary stress intensity is specified in NB-3221 of Reference

[3] for Design Conditions.

The limit of primary stress intensity for Level B (Upset),

Level C (Emergency),

Level D (Faulted),

and Test Condition is specified in NB-3223, NB-3224, NB-3225, and NB-3226 of Reference

[3], respectively

. . As presented in Reference

[2], the primary stress intensity criteria are the basic requirements in calculating the weld overlay size, which is w1der the assumption that a 3 60° circumferential flaw has grown completely through the original weld. Loading conditions in each service level have been considered in the weld overlay sizing calculation.

The nozzle to pipe region has been reinforced by the weld overlay since adding n1aterials to the nozzle outside region relieves primary stress burden resulting from internal pressure and external loads. The overlay further reduces stress concentration by eliminating the outside surface discontinuity.

Therefore, the primary stress intensity requirements for the nozzle, welds with overlay, safe end and pipe have been satisfied for all service level loadings without the need for further evaluation.

Other related criteria include the minitnum required pressure thickness (NB-3324 of Reference

[3]) and reinforcement area (NB-3330 of Reference

[3]), which were addressed in the original nozzle/pressurizer designs.

Adding weld overlay will increase the nozzle wall thickness and therefore these requirements are satisfied.

5.4.2 ASME Code Primary+

Secondary 51 Range and Fatigue Usage Criteria As stated previously, the stress analysis for transient conditions is required for a component to satisfy the requirements for repetitive loadings.

The following discussion describes the fatigue analysis process employed herein for the design. Computer runs for each transient time point chosen for stress analysis are contained in the ANSYS output files as listed in Section 53. The overall stress profile is then reviewed to Page 60 Controlled Document A ARE VA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary detennine the critical locations that require detailed stress/fatigue analysis.

The objective is to asslu*e that 1) the most severely stressed locations impacted by weld overlay are evaluated;

2) the specified region is quantitatively qualified.

Once the specific locations for detailed sn*ess evaluation are established, the related path lines can be defined with ANSYS. A post-processing is then conducted to convet1 the component stresses along the selected path lines into the SI categories (i.e., membrane, membrane

+ bending, total) that correlate to the criteria of the ASl\.ffi Code (Reference

[3]). The path lines selected for primary plus secondary SI range and fatigue failure evaluation are listed in Table 32. The path lines are shown in Figure 28 and Figure 29. A review of the results indicates that these paths include the highest stress locations for the model. Table 32 Path Lines for Linearized Stresses Path Line Node Location (See Figure 28 and Figure 29) Material Numbers PATH2 1235 1483 Nozzle (WOL end location)

SA-508, Class 2 PATH3 1222 1430 Nozzle with WOL SA-508, Class 2; Alloy 690 PATH4 2421 1333 Buttering with WOL PATHS 1323 3232 Nozzle to safe end weld with WOL Alloy 600; Alloy 690 PATHS 1S76 140S Safe end with WOL SA-182, F316L; Alloy 690 PATH7 3S3S 3293 Pipe weld with WOL SA-213, TP 304; Alloy 690 PATHS 1928 1433 Pipe with WOL SA--376, TP 316; Alloy 690 PATH9 1924 1901 Pipe ID to OD at WOL end SA-376, TP316 PATH3A 1222 14S1 Same as PATH3 (only nozzle material)

SA-508, Class 2 PATH3B 14S1 1430 Same as PATH3 (only WOL material)

Alloy 690 PATH4A 2421 1356 Same as PATH4 (only buttering material)

Alloy 600 PATH4B 13S6 1333 Same as PATH4 (only WOL material)

Alloy 690 PATH SA 1323 3247 Same as PATHS (only nozzle to safe end Alloy 600 weld material)

PATHSB 3247 3232 Same as PATHS (only WOL material)

Alloy 690 PATH SA 1576 1404 Same as PATHS (only safe end material)

SA-182, F316L PATH6B 1404 1405 Same as PATHS (only WOL material)

Alloy 690 PATH7A 3635 3244 Same as PATHS (only pipe weld material)

SA-213, TP 304 PATH7B 3244 3293 Same as PATHS (only WOL material)

Alloy 690 PATH8A 1928 3276 Same as PATH9 (only pipe material)

SA-376, TP316 PATHSB 3276. 1433 Same as PATH9 (only WOL material)

Alloy 690 Page 61 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprie'tary Figure 28 Path Lines for Stress Analysis Page 62 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 29 Partial Path Lines for Stress Analysis Page 63 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary 5.4.2.1 Maximum Primary + Secondary SI Range, NB-3222.2 External loads (Thermal Expansion, OBE and Valve Operation) that cause periodic stress changes shall also be included in calculating the maximum SI Ranges. The resulting values of this load combination are listed in Table 9. Except for the path lines PATHI and PATHIO where the stress variation due to these exten1al loads is negligible, stress intensity due to external loads is calculated at the corresponding section that contains the path lines. The geometric characteristics are listed in Table 33. Table 33 Geometric Characteristics of Path Line Cross-Section Location D d I Sao Sm A L -Hinch] [inch] [inch4] [inch1 [inch1 [inch2] [inch] * -PATH2 PATH3 PATH4 PATH5 PATH6 PATH7 PATHS PATH9 --Note (l): For path lines PATH8 and PATH9 the stress intensity due to axial bending stress frmn external shear forces would reduce the stress intensity due to transient loads. Therefore, the vertical distances from path line PATH8 and PATH9 are conservatively reduced to zero where: D [inch] -outside diameter of the WOL or pipe d [inch] -inside dian1eter of the nozzle, safe end or pipe I=!!_ (D4 -d4) [inch4]-mon1ent of inertia 64 *] S = --[inch3] -section modulus -outside diameter OD D/2 S -__!__ [inch3] -section modulus -inside diameter ID-d/2 A-_ Jr(D2 -d2) 2 * [inch ] -cross-sectwn area 4 Page 64 Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary L [inch] -moment arm -vertical distance from the inside node of path line PATH7 (safe end weld root) to the outside node of the other path Stress intensity (SI) at the inside and outside nodes of the selected path lines are then calculated and tabulated in Table 34. Table 34 Maximum Primary+

Secondary 51 due to External Loads Axial Stress Shear Stress M+B Location Oax_EX Oax_BF Oax_BM Oax_M+B Ts_Fs Ts_Mt Ts Sint [ksi] [ksi]

[ksi] [ksi] [ksi] [ksi] [ksi] [ksi]

Inside Diamet PATH2 PATH3 PATH4 PATH5 PATH6 PATH? PATHS PATH9 Outside Diam 1--PATH2 PATH3 PATH4 PATH5 PATH6 PATH7 PATHS PATH9 . . --The membrane

+ bending stress intensities due to external loads in Table 34 are calculated as follo\vs:

[ksi] -axialtnetnbrane stress due to external axial force (Fx) [ksi]-axial bending stress due to external bending Page 65 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Fs *L (J' ax BF -[ksi] -axial bending stress due to extenlal shear force (F s) s Fs A M r __ ._x s M, -2. S [ksi] -shear stress due to external shear force (Fs) [ksi] -shear stress due to exten1al torsion moment (Mx) (J' ax_M+B = (J'ax_EX

+ (J'ax_BF

+ (J'ax_BM

[ksi]-axialme1nbrane

+bending StreSS [ksi] -shear stress due to extenwl forces and m01nents

[ksi] -membrane

+ bending stress intensity Where Fx, Fy, Fz, Mx, My, and Mz are taken fron1 Table 9. Fs = (F/+F//12 Mb = (Af/+Af//12 S = SoD -for outside dimneter S = Sm -for inside dia1neter The ANSYS fatigue n1odule is used to calculate the tnaximlillllneinbrane

+bending SI range at each node of selected path lines Table 32 for all transients.

The 1nodule complies with ASME Code Section III, NB-3216.2 in calculating a stress intensity range. Titne points are also registered.

The ANSYS output files are: F M+B HA 182.ont ---F M+B HA 213.ont F M+B HA 376.out ---F M+B HA 600.out ---F M+B HA 690.out F M+B LA 508.out ---F M+B HA 182 A.out ----F M+B HA 213 A.out ---F M+B HA 376 A.out --F M+B HA 600 A.out F M+B HA 690 A.out ----F M+B LA 508 A.out ----The 1naxinuun me1nbrane

+bending SI ranges for all nodes along with Sis due to external loads are listed in Table 35. Page 66 Controlled Document A AREVA Document No. 32-9219780

-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 35 Summary of Maximum Primary+

Secondary Sl Ranges for Membrane+

Bending Stresses Inside Node Outside Node Sldueto (M+B 35m Sldueto (M+B 35m Path M+B External 51 Range) Limit<1) M+B External 51 Range) Limit<1) Name 51 Range Load<2) +(External SIRange Load<2) +(External Loads 51) Loads 51) _ [ksi] [ksi] [ksi] _ [ksi] _ [ksi] [ksi] [ksi] _ [ksi] PATH2 80.10 80.10 PATH3 80.10 69.90 PATH4 69.90 69.90 PATHS 69.90 69.90 PATH6 40.50 69.90 PATH? 45.30 69.90 PATHS 48.60 69.90 PATH9 48.60 48.60 PATH3JI 80.10 80.10 PATH3E 69.90 69.90 PATH4JI 69.90 69.90 PATH4E 69.90 69.90 PATH5JI 69.90 69.90 PATH5E 69.90 69.90 PATH6JI 40.50 40.50 PATH6E 69.90 69.90 PATH7JI 45.30 45.30 PATH7E 69.00 69.90 PATH8JI 48.60 48.60 PATH8E 69.90 69.90 ---.-Note (l): Table 32 provides 1naterial designation for each defined path line. The Sm values taken from Table 1 through Table 7 are the design stress intensities of material at the maximum transient temperature of 700°F for all path lines. Note (2): The external loads are calculated in Table 34. Note (3): The (M+B SI Range)+ (External Loads SI) is cmnbined by stress con1ponents

see Table 36. Page 67 Controlled Document A AREVA Document No.32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 36 PATH9-outside node of Maximum Primary+

Secondary Sl Range for Membrane+

Bending Stress Components Membrane

+ Bending Stress Components Location Sx Sy Sz Sxy Syz Sxz 51 Range [psi] [psi] [psi] [psi] [psi]

[psi] [ksi] Event 1 -CD, Time[ }us CD [ ] -Event 2 -LOL, *Time( )us LOL [ . ] I I I I I -Event2-Event 1 (M+B 51 Range) LOL-CD ll . ] I I I I I I External Loads 51 (Table 34) PATH9 ] -(M+B 51 Range)+ (External Loads 51) [ . ] PATH9 Table 35 lists the maximum membrane

+ bending stress intensity range obtained by conservatively adding the SI due to external loads to the maximum transient membrane

+ bending SI range. As shown in Table 35, the stress intensity ranges are within the 3Sm limits for all locations and the ASME Code requirements are met for all locations.

5.4.2.2 Fatigue Usage Factor Criteria (CFUF), NB-3222.4 For consideration of fatigue usage, the Peak Stress Intensity Ranges are calculated.

These values 1nust include the 'total' localized stresses.

The linearized membrane

+ bending stress intensity range used in fatigue usage factor calculation may not depict all of the potential peak stresses.

Therefore to bind the potential effect of this consideration, the membrane

+ bending stress intensity range is multiplied by a *Fatigue Strength Reduction Factor (FSRF). In general Reference

[10] is used for guidance on FSRF for geometric discontinuities in this modeL *The calculation is perfom1ed separately for different materials.

The loads cases of all transients are combined for the maximum SI range. The number of cycles of the appropriate transient is used in the fatigue usage factor calculation.

When combining with other transients, the number of cycles of this transient 1nay be reduced accordingly.

All transient combinations

\:vith SI ranges contributions to the fatigue usage factor are included in Table 38 through Table 43. Page 68 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Based on review of the SI range results, the following locations produce higher fatigue usage factor: Table 37 Stress Category and FSRF in Fatigue Evaluation Material Path Line Node location Stress FSRF Category SA-508, Class 2 (Safety/Relief Nozzle, Head)

PATH3 Inside M+B .. ...; Alloy 600 (Buttering, Nozzle to Safe End Weld) PATHS Inside Total l SA-182, F316L (Safe End) PATH6 Inside M+B SA-213, TP 304 (Safe End to Pipe Weld) PATH7 Inside M+B [ 1 -; SA-376, TP 316 (Pipe) PATH9 Outside M+B --. Alloy 690 (Weld Overlay)

PATH88 Outside M+B PATH8B and PATH9 outside nodes are part of geometric discontinuity.

Therefore the maximum membrane

+ bending SI ranges are multiplied by conservative FSRF of 2.0 to account for geometric discontinuity.

Per Reference

[10], Chapter 6, it has been reviewed that this value is conservative.

Since the mesh is fine enough and there is no discontinuity at path PATHS inside node, the 'Total' SI ranges and no FSRF is used for the fatigue usage factor calculation in these locations.

Membrane

+ bending SI ranges at paths PATH1, PATH6 and PATH7 inside nodes are n1ultiplied by conservative FSRF of 2.0. The membrane

+ bending stress intensity ranges are documented in the following ANSYS output files: F M+B HA 182.out F M+B HA 182 A.out ------F M+B HA 213.out F M+B HA 213 A.out -------F M+B HA 376.out F M+B HA 376 A.out -------F M+B HA 600.out F M+B HA 600 A.out -------F M+B HA 690.out F M+B HA 690 A.out -------F M+B LA 508.out F M+B LA 508 A.out -------The total stress intensity ranges are documented in the following ANSYS output files: F TOT HA 182.out F TOT HA 182 A.out -------F TOT HA 213.out F TOT HA 213 A.out -------F TOT HA 376.out F TOT HA 376 A.out -------F TOT HA 600.out F TOT HA 600 A.out -------F TOT HA 690.out F TOT HA 690 A.out -------F TOT LA 508.out F TOT LA 508 A.out -------Page 69 Controlled Document AREV.t\ Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Note that only the stress intensity ranges and the corresponding time points are taken from the output files since stress intensities due to external loads are not included in the ANSYS output. The stress intensity due to the external loads is added at each node for each SI range. A review of the results indicates that all CFUF values are well below 1.0. Table 38 through Table 43 provide the calculation of the cumulative fatigue usage factor based on the loads and cycles specified in Section 4.5. The values of 'E curve' in the following tables are taken from References

[ 3] and [ 12]. RANGE NUM. 1 2 3 4 5 6 7 8 9 Table 38 Relief/Safety Nozzle, Head Fatigue Usage Calculation EVALUATION TITLE: Diablo Canyon 2-PATH3 (inside node)

REFERENCE:

F _M+B_LA_508.out MATERIAL:

SA-508 Class 2 TYPE: Low-alloy steel UTS (ksi) = [ 1 Emat (psi)= [ 1 atT{ 1 E ratio = Ecurve/Emat TRANSIENTS REQ'D PEAK Sl WITH RANGE Emat EXTREMES CYCLES RANGE (Eratio) x ALLOWABLE Salt CYCLES 'N' Salt HU-LOP HU-LOL HU-IASA HU-SVO CD-LT HU-LD CD-LD LLD-LLD LD-TRT USAGE FACTOR 'U' *-Total Fatigue Usage Factor= L J The Peak Sl Range x Fatigua..S; ength Re E:a.cj pr (FSRF) For Range 1, 'M+B' Sl Range = For Range 2, 'M+B' Sl Range = For Range 3, 'M+B' Sl Range = For Range 4, 'M+B' Sl Range = For Range 5, 'M+B' Sl Range = For Range 6, 'M+B' Sl Range = For Range 7, 'M+B' Sl Range= For Range 8, 'M+B' Sl Range = FSRF = FSRF = FSRF = FSRF= FSRF = FSRF = FSRF = FSRF= For Range 9, 'M+B' Sl Range = FSRF = Note (IJ: The stress intensities aue to extema loads C Ii+"OBlr;""

H+VO) calculated in section 5.4.2.1 (Table 34, PATII3) are conservatively added to the highest SI range due to transient loads for the first 400 cycles. Note (2): 700°F is conservatively used maximum temperature occurring during the plant operation.

Page 70 Controlled Document A AREVA Document No. 32-9219780-002

! Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 39 Buttering, Nozzle to Safe End Weld Fatigue Usage Calculation EVALUATION TITLE: Diablo Canyon 2-PATHS (inside node)

REFERENCE:

F _TOT_HA_600.out MATERIAL:

Alloy 600, SB-166 TYPE: High-alloy steel UTS (ksi) = [ ] Emat (psi)= [ ] atT{ ] E ratio = Ecurve/Emat TRANSIENTS USAGE RANGE REQ'D PEAK Sl (Eratio) x ALLOWABLE WITH RANGE E mat Salt FACTOR NUM.

RANGE Salt CYCLES 'N' EXTREMES

'U' 1 HU-LOP 2 CD-IASA 3 CD-SVO 4 HU-LOL 5 HU-LT 6 CD-LD -Total Fatigue Usage Factor = The Peak Sl

+....f.l ernal Loads<1> For Range 1, 'Total' Sl Range = ksi; For Range 2, 'Total' Sl Range = ksi; For Range 'Total' Sl Range = ksi; For Range 4, 'Total' Sl Range = ksi; For Range 5, 'Total' Sl Range = ksi; For Range 6, 'Total' Sl Range= ksi; --Note (1): The stress intensities due to external loads (TH+OBE; TH+VO) calculated in section 5.4.2.1 (Table 34, PATHS) are conservatively added to the highest SI range due to transient loads for the frrst 400 cycles. Note (2): 700°F 1s conservatively used maxin1um te1nperature occurring during the plant operation.

-J r--Page 71 Controlled Document A AREVA Document No.32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 40 Safe End Fatigue Usage Calculation EVALUATION TITLE: Diablo Canyon 2-PATHS (inside node)

REFERENCE:

F _M+B_HA_182.out MATERIAL:

SA-182,F316L TYPE: High-alloy steel UTS (ksi) = [ ] Emat (psi)= [ ] atT ( ] E ratio = Ecurve/Emat RANGE TRANSIENTS REQ'D I PEAKSI I I I (Eratlo) x I ALLOWABLE I USAGE NUM. WITH RANGE _:.vcLES RANGE Emat Salt Salt CYCLES 'N' FACTOR EXTREMES

u*-1 CD-LOL 2 CD-SVO 3 CD-LOP 4 CD-LLD 5 HU-LLD 6 HU-Ll 7 LI-IASA 8 Ll-LOF -I I I I I J Total Fatigue Usage Factor= l The Peak Sl Rang x.Eati Strength RE W-Jctiw; Factor (FSRF) + External Loads<1> For Range 1. 'M+B' Sl Range = ksl; FSRF For Range 2, 'M+B' Sl Range = ksl; FSRF For Range 3, 'M+B' Sl Range = ksl; FSRF For Range 4, 'M+B' Sl Range = ksi; FSRF For Range 5, 'M+B' Sl Range = ksi; FSRF For Range 6, 'M+B' Sl Range = ksl; FSRF For Range 7, 'M+B' Sl Range= ksi; FSRF For Range 8, 'M+B' Sl Range = ksi; FSRF ----Note (I): The stress intensities due to external loads (TH+OBE; TH+VO) calculated in section 5.4.2.1 (Table 34, PATH6) are conservatively added to the highest SI range due to transient loads for the first 400 cycles. Note (2): 700°F is conservatively used maximwn temperature occurring during the plant operation.

-J Page 72 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 41 Safe End to Pipe Weld Fatigue Usage Calculation EVALUATION TITLE: Diablo Canyon 2-PATH7 (inside node)

REFERENCE:

F _M+B_HA_213.out MATERIAL:

SA-213, TP304 TYPE: High-alloy steel UTS (ksi) = [ ] Emat (psi)= [ ] atT =( ] E ratio = Ecurve/Emat RANGE TRANSIENTS REQ'D I PEAKS! I I I (Eratlo) x I ALLOWABLE I USAGE WITH RANGE Emat Salt FACTOR NUM. EXTREMES RANGE Salt CYCLES 'N' *u* 1 CD-LOL 2 CD-SVO 3 CD-LOP 4 CD-LLD 5 HU-LLD 6 HU -LD --Total Fatigue Usage Factor= [ The Peak Sl Rar 'M+B' w igue Strength Re Factor (FSRF) +External Loads(1l For Range 1, 'M+B' Sl Range = ksi; FSRF = For Range 2, 'M+B' Sl Range = ksi; FSRF = For Range 3, 'M+B' Sl Range = ksi; FSRF = For Range 4, 'M+B' Sl Range = ksi; FSRF: For Range 5, 'M+B' Sl Range = ksi; FSRF = For Range 6, 'M+B' Sl Range = ksi; FSRF: ----Note (l): The stress intensities due to external loads (TH+OBE; TH+VO) calculated in section 5.4.2.1 (Table 34, PATH7) are conservatively added to the highest SI range due to transient loads for the first 400 cycles. Note (z): 700°F is conservatively used maxi1num temperature occurring during the plant operation.

--Page 73 Controlled Document AREVA Document No.32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 42 Pipe Fatigue Usage Calculation EVALUATION TITLE: Diablo Canyon 2:.. PATH9 (outside node)

REFERENCE:

F _M+B_HA_376.out MATERIAL:

SA-376, TP316 TYPE: High-alloy steel UTS (ksi) = [ ] Emat (psi)= [ ] atT{ ] E ratio = Ecurve/Emat RANGE TRANSIENTS PEAKSI REQ'D I I I I I I USAGE WITH RANGE Emat S all (Eratlo) x ALLOWABLE FACTOR NUM.

RANGE Salt CYCLES 'N' 'U'

EXTREMES 1 CD-LOL 2 CD-SVO 3 CD-LOP 4 CD-LLD 5 HU -LLD 6 HU-LD 7 LD -IASA Total Fatigue Usage Factor= [ The Peak Sl

'M+B' Strength Re,E,ucti2!'

Factor (FSRF) + External Loads<1> For Range 1, 'M+B' Sl Range = ksi; FSRF For Range 2, 'M+B' Sl Range = ksi; FSRF For Range 3, 'M+B' Sl Range = ksi; FSRF For Range 4, 'M+B' Sl Range = ksi; FSRF For Range 5, 'M+B' Sl Range = ksi; FSRF For Range 6, 'M+B' Sl Range = ksi; FSRF For Range 7, 'M+B' Sl Range= ksl; FSRF ----Note (1): The stress intensities due to external loads TH+VO) calculated in section 5.4.2.1 (Table 34, PATH9) are conservatively added to the highest SI range due to transient loads for the first 400 cycles. Note (2): 700°F is conservatively used maximum temperature occurring during the plant operation.

I -Page 74 Controlled Document A AREV.A Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 43 Weld Overlay Fatigue Usage Calculation EVALUATION TITLE: Diablo Canyon 2-PATHSB (outside node)

REFERENCE:

F _M+B_HA_690_A.out MATERIAL:

Alloy 690, SB-166 TYPE: High-alloy steel UTS (ksi) = [ 1 Emat (psi)= [ 1 atT{ 1 E ratio = Ecurve/Emat RANGE TRANSIENTS REQ'D I PEAKSI I I I (Eratlo) x I ALLOWABLE I USAGE NUM. WITH RANGE CYCLES RANGE Emat Salt Salt CYCLES 'N' FACTOR EXTREMES

-*u*-1 CD-LOL 2 HU-LOP 3 HU-SVO 4 CD-LLD 5 HU -LLD 6 HU-LT 7 IASA-LT 8 LD -IASA -Total Fatigue Usage Factor= [ The Peak Sl

'M+B' Strength (FSRF) + External Loads<1> For Range 1, 'M+B' Sl Range = ksl; FSRF= For Range 2, 'M+B' Sl Range = ksi; FSRF = For Range 3, 'M+B' Sl Range = ksi; FSRF= For Range 4, 'M+B' Sl Range = ksl; FSRF = For Range 5, 'M+B' Sl Range = ksi; FSRF= For Range 6, 'M+B' Sl Range = ksi; FSRF= For Range 7, 'M+B' Sl Range= ksl; FSRF = For Range 8, 'M+B' Sl Range= ksl; FSRF= -... -.....__ Note (l): The stress intensities due to external loads (TH+OBE; TH+VO) calculated in section 5.4.2.1 (Table 34, PATHS) are conservatively added to the highest SI range due to transient loads for the first 400 cycles. Note (2): 700°F is conservatively used maximum temperature occurring during the plant operation.

1 Page 75 Controlled Document A AREVA Document No.32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary 6 RESULTS SUMMARY/CONCLUSIONS The preceding calculations demonstrate that the design of the safety/relief nozzle weld overlay for the pressurizer of Diablo Canyon Unit 2 meets the stress and fatigue requirements of the Design Code (Reference

[3]). Based on the loads and cycles specified in References

[ 6] and [8] , the conservative fatigue analysis indicates that pressurizer safety/relief nozzle weld overlay design has the maximum usage factor o{ ]for specified number of cycles per Reference

[ 6] compared to the AS:rvfE Code allowed maxi1num value of 1.0. The results of this analysis cover evaluation of the original design of the pressurizer safety/relief nozzle without weld overlay.

Table 44 Summary of Results Max. 51 RangePL +Pb+Q Fatigue Usage Calculated Limit IR= Calculated Limit IR= """-[ksi] -[ksi] '"'"H;al.ilimit

-

Safety/Relief Nozzle 80.10 1 Buttering, Nozzle to 69.90 1 Safe End weld Safe End 40.50 1 Safe End to Pipe Weld 45.30 1 Pipe 48.60 1 Weld Overlay 69.90 1 ------Note: Primary stresses are bounded by original

analysis, see section 5.4.1. Page 76 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary 7 REFERENCES

[1] AREVA Drawing 02-8018401C-001, "Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Existing Configuration"

[2] AREVA Document 32-9043545-001, "Diablo Canyon Unit 2, Pressurizer Safety/Relief Nozzle Weld Overlay Sizing

[3] ASME Boiler and Pressure Vessel Code, Section ill, 2001 Edition including Addenda through 2003 [4] "ANSYS" Finite Element Computer Code, Version 11.0, ANSYS, Inc., Canonsburg

, PA [5] AREVA Document 08-9042937-003, "Diablo Canyon Unit 2 Pressurizer Nozzle Weld Overlays

-Certified Design Specification"

[6] AREVA Document 38-9046469-002, "PG&E Design Input Transmittal

, Non Proprietary"

[7] AREVA Document 38-2200488-002, "PG&E Design Input Transmittal Proprietary"

[8] AREVA Document 51-9048271-000, "Diablo Canyon 2 PWOL Design Transients"

[9] Not used [10]

John F. Harvey, "Theory and Design of Pressure Vessels,"

Second Edition, Van Nostran Reinhold, 1991. [11] AREVA Drawing 02-8019311D-001, "Diablo Canyon Pressurizer Safety & Relief Nozzle Weld Overlay Design Input" [12] ASME Boiler and Pressure Vessel Code, Section ill, 1965 Edition including Addenda through Summer 1966 [13] ASME Boiler and Pressm*e Vessel Code, Section lll, Addenda Winter 1966 through Winter 1967 [ 14] ASME Boiler and Pressure Vessel Code, Section Ill, 1968 Edition including Addenda through Winter 1969 [15] ASME Boiler and Pressure Vessel Code, Section lll, 1971 Edition [ 16] AREV A Document NPGD-TM-500 rev D, "NPGMAT",

NPGD Material Properties

Program, Manual (03/1985)

[17] "ANSYS" Finite Element Computer Code, Version 14.0, ANSYS, Inc., Canonsburg, PA [18] AREVA Document 38-9200149-001, "DCPP Unit 2 Pressurizer Nozzle NDE Data" Page 77 Controlled Document A AREVA Document No.32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary 8 COMPUTER OUTPUT FILES The relevant ANSYS input and output flies are listed in the following tables. ANSYS program verification tests for the elements used in the analysis are listed at the end of the table. Please note that files listed in Table 45 are listed in the AREV A COLD storage system. Table 45 List of Relevant ANSYS Input and Output Files File Name Date Description OC2_geo.out 05/02/2007 Output file to develop finite element model DC2_geo_WB.mac 05/02/2007 Input file from Ansys Workbench Mat_prop.mac 04/16/2007 Input file includes material properties DC2_inp _ dt.mac 05/02/2007 Input file defining nodes for temperature and thermal gradient evaluation Design Condition DC2_des_pres.out 05/02/2007 Output file for design Condition HUCD Transient HUCD_tr.mac 05/08/2007 Input file contains definition of HUCD transient DC2_HUCO

_th.out 05/08/2007 Output file for thermal analysis of HUCD DC2_HUCO_dt.out 05/08/2007 Output file contains thermal gradients of HUCO DC2_HUCD_st.out 05/08/2007 Output file for stress analysis of HUCD LOLl Transient LDLI_tr.mac 05/01/2007 Input file contains definition of LOLl transient OC2_LOLI_th.out 05/02/2007 Output file for thermal analysis of LOLl DC2_LOLI_dt.out 05/02/2007 Output file contains thermal gradients of LOLl DC?_LDLI_st.out 05/03/2007 Output file for stress analysis of LOLl LLD Transient LLO_tr.mac 05/02/2007 Input file contains definition of LLO transient DC2_LLD_th.out 05/02/2007 Output file for thermal analysis of LLO DC2_LLD_dt.out 05/02/2007 Output file contains thermal gradients of LLO OC2_LLD_st.out 05/03/2007 Output file for stress analysis of LLO LOL Transient LOL_tr.mac 05/02/2007 Input file contains definition of LLO transient OC2_LOL_th.out 05/02/2007 Output file for thermal analysis of LLO DC2_LOL_dt.out 05/02/2007 Output file contains thermal gradients of LLO OC2_LOL_st.out 05/03/2007 Output file for stress analysis of LLO LOP Transient LOP_tr.mac 05/02/2007 Input file contains definition of LOP transient OC2_LOP _th.out 05/02/2007 Output file for thermal analysis of LOP OC2_LOP _dt.out 05/02/2007 Output file contains thermal gradients of LOP OC2_LOP _stout 05/03/2007 Output for stress analysis of LOP Page 78 Controlled Document A AREVA Document No.32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 44 (continued)

List of Relevant ANSYS Input and Output Files LOF Transient LOF _tr.mac 05/02/2007 Input file contains definition of LOF transient DC2_LOF _th.out 05/02/2007 Output file for thermal .analysis of LOF DC2_LOF _dt.out 05/02/2007 Output file contains thermal gradients of LOF DC2_LOF _st.out 05/03/2007 Output file for stress analysis of LOF RT Transient RT_tr.mac 05/02/2007 Input file contains definition of RT transient DC2_RT _th.out 05/02/2007 Output file for thermal analysis of RT DC2_RT _dt.out 05/02/2007 Output file contains thermal gradients of RT DC2_RT _st. out 05/03/2007 Output file for stress analysis of RT TRT Transient TRT_tr.mac 05/02/2007 Input file contains definition of TRT transient DC2_ TRT _th.out 05/02/2007 Output file for thermal analysis of TRT DC2_ TRT _dt.out 05/02/2007 Output file contains thermal gradients of TRT DC2_ TRT _stout 05/03/2007 Output file for stress analysis of TRT IASA Transient IASA_tr.mac 05/02/2007 Input file contains definition of IASA transient DC2_1ASA_th.out 05/02/2007 Output file for thermal analysis of IASA DC2_1ASA_dt.out 05/02/2007 Output file contains thermal gradients of IASA DC2_1ASA_st.out 05/03/2007 Output file for stress analysis of IASA SVO Transient SVO_tr.mac 05/08/2007 Input file contains definition of SVO transient DC2_SVO_th.out 05/08/2007 Output file for thermal analysis of SVO DC2_SVO_dt.out 05/08/2007 Output file contains thermal gradients of SVO DC2_ SVO _stout 05/08/2007 Output file for stress analysis of SVO Fatigue Usage Factor Calculation F _M+B_HA_182.out 05/08/2007 Stress range results for membrane

+ bending stresses F _M+B_HA_182_Aout 05/08/2007 Stress range results for membrane

+ bending stresses F _M+B_HA_376.out 05/11/2007 Stress range results for membrane

+ bending stresses F _M+B_HA_376_Aout 05/08/2007 Stress range results for membrane

+ bending stresses F _M+B_HA_600

.out 05/08/2007 Stress range results for membrane

+ bending stresses F _M+B_HA_600_Aout 05/08/2007 Stress range results for membrane

+ bending stresses F _M+B_HA_690.out 05/08/2007 Stress range results for membrane

+ bending stresses F _M+B_HA_690_Aout 05/08/2007 Stress range results for membrane

+ bending stresses F _M+B_HA_213.out 05/09/2007 Stress range results for membrane

+ bending stresses F _M+B_HA_213_Aout

05/09/2007 Stress range results for membrane

+ bending stresses Page 79 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 44 (continued)

List of Relevant ANSYS Input and Output Files F _M+B_LA_SOB.out 05/10/2007 Stress range results for membrane

+ bending stresses F _M+B_LA_SOB_A

.out 05/10/2007 Stress range results for membrane

+ bending stresses F _TOT _HA_182.out 05/09/2007 Stress range results for total stresses F _TOT _HA_182_A.out 05/09/2007 Stress range results for total stresses F _TOT _HA_376.out 05/09/2007 Stress range results for total stresses F _TOT _HA_376_A.out 05/09/2007 Stress range results for total stresses F _TOT _HA_600.out 05/09/2007 Stress range results for total stresses F _TOT_HA_600_A.out 05/09/2007 Stress range results for total stresses F _TOT _HA_690.out 05/10/2007 Stress range results for total stresses F _TOT _HA_690_A.out 05/10/2007 Stress range results for total stresses F _TOT_HA_213.out 05/09/2007 Stress* range results for total stresses F _TOT_HA_213_A.out 05/09/2007 Stress range results for total stresses F _TOT _LA_508.out 05/10/2007 Stress range results for total stresses F

_LA_508_A.out 05/10/2007 Stress range results for total stresses ANSYS Verification Files vm56.out 05/11/2007 2-0 8-node structural element vm112.out 05/11/2007 2-0 8-node thermal element Fracture OC2_fr__path.out 05/17/07 Output files contains definition for fracture calculation OC2_HUCO

_fr _ SY.out 05/17/07 Output file contains stress components along the fracture paths for HUGO transient OC2_HUCO_fr_SZ.out 05/17/07 Output file contains stress components along the fracture paths for HUGO transient OC2_HUCD

_fr _ TH.out 05/17/07 Output file contains temperatures along the fracture paths for HUCO transient DC2_LOLI_fr_SY.out 05/17/07 Output file contains stress components along the fracture paths for LOLl transient DC2_LOLI_fr

_ SZ.out 05/17/07 Output file contains stress components along the fracture paths for LOLl transient

' DC2_LDLI_fr_

TH.out 05/17/07 Output file contains temperatures along the fracture paths for LOLl transient DC2_LLO_fr_SY.out 05/17/07 Output file contains stress components along the fracture paths for LLD transient DC2_LLO _fr _ SZ.out 05/17/07 Output file contains stress components along the fracture paths for LLD transient DC2_LLD_fr_

TH.out 05/17/07 Output file contains temperatures along the fracture paths for LLD transient DC2_LOL_fr_

SY .out 05/17/07 Output file contains stress components along the fracture paths for LOL transient DC2_LOL_fr_SZ

.out 05/17/07 Output file contains stress components along the fracture paths for LOL transient Page 80 ControUed Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 44 (continued)

List of Relevant ANSYS Input and Output Files DC2_LOL_fr_

TH.out 05/17/07 Output file contains temperatures along the fracture paths for LOL transient DC2_LOP _fr_SY.out 05/17/07 Output file contains stress components along the fracture paths for LOP transient DC2_LOP _fr_SZ.out l Output file contains stress components along the fracture 05/17/07 paths for LOP transient DC2_LOP _fr_ TH.out 05/17/07 Output file contains temperatures along the fracture paths for LOP transient DC2_LOF _fr_SY.out 05/17/07 Output file contains stress components along the fracture paths for LOF transient DC2_LOF _fr_ SZ.out 05/17/07 Output file contains stress components along the fracture paths for LOF transient DC2_LOF _fr_ TH.out 05/17/07 Output file contains temperatures along the fracture paths for LOF transient DC2_RT _fr_SY.out 05/17/07 Output file contains stress components along the fracture paths for RT transient DC2_RT _fr_SZ.out 05/17/07 Output file contains stress components along the fracture paths for RT transient DC2_RT _fr_ TH.out 05/17/07 Output file contains temperatures along the fracture paths for RT transient

DC2_ TRT _fr_SY.out 05/17/07 Output file contains stress components along the fracture paths for TRT transient DC2_ TRT _fr_SZ.out 05/17/07 Output file contains stress components along the fracture paths for TRT transient DC2_ TRT _fr_ TH.out 05/17/07 Output file contains temperatures along the fracture paths for TRT transient DC2_1ASA_fr_SY.out 05/17/07 Output file contains stress components along the fracture paths for IASA transient DC2_1ASA_fr_SZ.out 05/17/07 Output file .contains stress components along the fracture paths for IASA transient DC2_1ASA_fr_

TH.out 05/17/07 Output file contains temperatures along the fracture paths for IASA transient DC2_SVO_fr_SY.out 05/17/07 Output file contains stress components along the fracture paths for SVO transient DC2_SVO_fr_SZ.out 05/17/07 Output file contains stress components along the fracture paths for SVO transient DC2_SVO_fr_

TH.out 05/17/07 Output file contains temperatures along the fracture paths for SVO transient Page 81 Controlled Document A AREVA Document No.32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary APPENDIX A Stresses used for Safety/Relief Nozzle Weld Overlay Fracture Mechanics Analysis Page 82 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary A-1 PURPOSE The purpose of this appendix is to provide suppletnental stress and thermal results of the transient analysis for a fracture mechanics analysis of the safety/relief nozzle weld overlay.

A-2 STRESS AND TEMPERATURE EVALUATION The ANSYS Post Processor is used to tabulate the stress and temperature along the predetermined paths. The paths are shown in Figure A-1 and described in Table A-1. The post processor calculation for fracture analysis is contained in computer file: DC2 _ fr _path.mac Table A -1 Paths Description Path Line Node Location Material Numbers FPath1 1211 1425 Buttering with WOL Alloy 600, Alloy 690 FPath2 2419 1424 Buttering with WOL Alloy 600, Alloy 690 FPath3 1323 1410 Nozzle to safe end weld with WOL Alloy 600, Alloy 690 FPath4 3635 .3293 Pipe weld with WOL SA-182, F316L, Alloy 690 Linearized stresses along the path line in the global coordinate system with "y" axis along the nozzle axis are summarized at thirteen points separated by an equal distance from the inside node to the outside node. At each point the axial (Sy) stress, hoop (Sz) stress and the temperature (Th) in the weld or weld overlay are given. The path point distances from the inside nodes are included in the output file: Fr _PathLocs.out ANSYS post processing output files are listed in section 8 and the stresses and temperatures output results files for the fracture mechanics are listed below: DC2 HUCD fr SY.out DC2 LOF fr SY.out DC2 LDLI fr SY.out DC2 RT fr SY.out ---DC2 LLD fr SY.out DC2 TRT fr SY.out DC2 LOL fr SY.out DC2 IASA fr SY.out DC2 LOP fr SY.out DC2 SVO fr SY.out DC2 HUCD fr SZ.out DC2 LOF fr SZ.out DC2 LDLI fr SZ.out DC2 RT fr SZ.out DC2 LLD fr SZ.out DC2 TRT fr SZ.out Page 83 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary DC2 LOL fr SZ.out DC2 IASA fr SZ.out ------DC2 LOP fr SZ.out DC2 SVO fr SZ.out DC2 HUCD fr TH.out DC2 LOF fr TH.out DC2 LDLI fr TH.out DC2 LLD fr TH.out DC2 LOL fr TH.out DC2 LOP fr TH.out ---DC2 RT fr TH.out ---DC2 TRT fr TH.out DC2 IASA fr TH.out DC2 SVO fr TH.out Figure A -1 Paths Defined for Fracture Mechanics Evaluation Page 84 Control!ed Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary APPENDIX 8-COMPARISON OF ANSYS 11.0 AND 14.0 RESULTS Since the analyses in Rev.001 of this document were performed using ANSYS 11.0 on a Windows NT system, while the analyses in Rev.002 are performed using ANSYS 14.0 on a 64-bit machine, it is unknown whether the results in Rev.001 are still valid for Rev.002.

The purpose of this Appendix is to compare the calculated results of ANSYS 11.0 and ANSYS 14.0. The comparisons are made on design condition and selected transients in both temperature and stress: It is concluded from the subsections below that the results from ANSYS 11.0 and 14.0 are the same. 8.1 Design Condition For the design condition, the stress intensity contour plot using ANSYS 14.0 is illustrated in Figure B-1. By comparing to Figure 6 (using ANSYS 11.0), it can be seen that the results are identical.

Figure 8-1: Stress Intensity Contours for Design Condition using ANSYS 14.0 8.2 Temperature For temperature

history, the transients HUCO and LOLl are selected for comparison.

The temperatures versus time as well as the temperature gradients for HUCO using ANSYS 14.0 are illustrated in Figure 8-2 and Figure 8-3 respectively.

It is observed that these two figures are identical to the results of ANSYS 11.0 in Figure 8 and Figure 9. The same observation is made on transient LOLl by comparing Figure 8-4 to Figure 10, and Figure 8-5 to Figure 11. The legends shown in Figure 8-2 through Figure 8-5 are defined in Table 21 and are depicted in Figure 7. Page 85 ControUed Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure B-2: Temperature of Selected Locations (HUCD) using ANSYS 14.0 Page 86 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary

( Figure 8-3: Thermal Gradients of Selected Locations (HUCD) using ANSYS 14.0 Page 87 ControUed Document A AREVA

Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-4: Temperature of Selected Locations (LOLl) using ANSYS 14.0 Page 88 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-5: Thermal Gradients of Selected Locations (LOLl) using ANSYS 14.0 8.3 Stress Stress distribution along path lines are compared in this section.

The axial stress (SY) and hoop stress (SZ) at four path lines, defined in Figure A-1, during various transients are extracted in Rev.001.

These stress data files are listed in Table 45 "Fracture".

For comparison, the same path line stresses are extracted in Rev.002 using ANSYS 14.0. The comparisons of stress data are made in Excel file comparison.xlsx in Table B-1. The comparisons were made on selected transients and orientations, which are HUCD_SY,

LDLI_SZ, LOL_SY, and LOP _SZ. It is found from the comparison results that the data in ANSYS 11.0 and 14.0 are almost identical at every time point and path line location.

The maximum variation between ANSYS 11.0 and 14.0 results is 0.1 psi. 8.4 Software and Hardware ANSYS Version 14.0 [17] is used for Appendix B and Appendix C. The hardware platform (Service Tag# 5VK16S1) is Intel CoreŽ i7-2640M CPU 2.80 GHz, 8.00 GB RAM and Operating System is Page 89 Cant oiled Document A A.REVA. Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Microsoft Windows 7 Enterprise, Copyright

8.5 Computer Files All computer files, including the computer input/output files for the analysis in this document, and the computer program test cases are listed in this section.

All files are available in AREVA NP Inc. ColdStor storage \\cold\Generai-Access\32\32-9000000\32-9049114-002\official.

Test cases vm56 and vm 112 from Reference

[17] are run to verify that the answers are correct.

The files vm56.vrt and vm112.vrt contain output from the test cases. Review of the output files shows that the answers are identical to those contained in Reference

[17]. 1. Computer program tested: ANSYS Version 14.0 2. Computer hardware used: Intel CoreŽ i7-2640M CPU 2.80 GHz Service Tag# 5VK16S1 3. Name of person running test: Pei-Yuan Cheng 4. Date of test: 10-03-2013

5. Results and acceptability:

The results in vm56.vrt and vm112.vrt listed in Table B-1 agree exactly with the values in the ANSYS manual [17]. File Name dc2_geo.out DC2_geo_WB.mac mat_prop.mac DC2_inp_dt.mac DC2_des_pres.out hucd_tr.mac DC2_HUCD_th.out DC2_HUCD_dt.out DC2_HUCD_st.out ldli_tr.mac Table B-1: Computer Files Checksum Modified Date Time 11901 Oct 03 2013 15:41:41 03640 Oct 03 201315:22:10 63267 Oct 03 2013 15:22:23 24910 Oct 03 2013 15:23:00 Design Condition Description Output file to develop finite element model Input file from Ansys Workbench Input file includes material properties Input file defining nodes for temperature and thermal gradient evaluation 41742 Oct 07 2013 14:54:49 Output file for design Condition 27643 57841 46646 16260 19186 HUCD Transient Oct 03 2013 15:50:51 Oct 03 2013 17:55:26 Oct 03 2013 17:55:28 Oct 03 2013 17:55:39 LOLl Transient Oct 03 2013 15:51:02 Input file contains definition of HUCD transient Output file for thermal analysis of HUCD Output file contains thermal gradients of HUCD Output file for stress analysis of HUCD Input file contains definition of LOLl transient Page 90 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary File Name Checksum Modified Date Time Description DC2_LDLI_th

.out 25006 Oct 03 2013 17:56:19 Output file for thermal analysis of LOLl DC2_LDLI_dtout 30133 Oct 03 2013 17:56:21 Output file contains thermal gradients of LOLl DC2_LDLI_stout 02521 Oct 03 2013 17:56:35 Output file for stress analysis of LOLl LLD Transient lld_tr.mac 31823 Oct 03 2013 15:51:21 Input file contains definition of LLD transient DC2_LLD_th.out 04182 Oct 03 2013 17:57:10 Output file for thermal analysis of LLD DC2_LLD_dtout 08066 Oct 03 2013 17:57:12 Output file contains thermal gradients of LLD DC2_LLD _stout 25038 Oct 03 2013 17:57:25 Output file for stress analysis of LLD LOL Transient lol_tr.mac 10419 Oct 03 2013 15:51:31 Input file contains definition of LLD transient DC2_LOL_th.out 11502 Oct 03 2013 17:57:54 Output file for thermal analysis of LLD DC2_LOL_dtout 59140 Oct 03 2013 17:57:56 Output file contains thermal gradients of LLD DC2_LOL_stout 08679 Oct 03 2013 17:58:04 Output file for stress analysis of LLD LOP Transient lop_tr.mac 03421 Oct 03 2013 15:51:37 Input file contains definition of LOP transient DC2_LOP _th.out 07618 Oct 03 2013 17:58:30 Output file for thermal analysis of LOP DC2_LOP _dtout 49056 Oct 03 2013 17:58:32 Output file contains thermal gradients of LOP DC2_LOP _st.out 47331 Oct 03 2013 17:58:43 Output file for stress analysis of LOP LOF Transient lof_tr.mac 31206 Oct 03 2013 15:51:26 Input file contains definition of LOF transient DC2_LOF _th.out 42379 Oct 03 2013 17:59:18 Output file for thermal analysis of LOF DC2_LOF _dtout 25101 Oct 03 2013 17:59:21 Output file contains thermal gradients of LOF DC2_LOF _stout 32597 Oct 03 2013 17:59:31 Output file for stress analysis of LOF RT Transient rt_tr.mac 34473 Oct 03 2013 15:51:42 Input file contains definition of RT transient DC2_RT _th.out 31820 Oct 03 2013 17:59:55 Output file for thermal analysis of RT Page 91 Document A ARE VA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary File Name Checksum Modified Date Time Description DC2_RT _dtout 48885 Oct 03 2013 17:59:57 Output file contains thermal gradients of RT DC2_RT _stout 49916 Oct 03 2013 18:00:01 Output file for stress analysis of RT TRT Transient trt_tr.mac 27728 Oct 03 2013 15:51:52 Input file contains definition of TRT transient DC2_ TRT _th.out 00883 Oct 03 2013 18:00:21 Output file for thermal analysis of TRT DC2_ TRT _dtout 45034 Oct 03 2013 18:00:22 Output file contains thermal gradients of TRT DC2_ TRT ..... stout 23465 Oct 03 2013 18:00:27 Output file for stress analysis of TRT IASA Transient iasa_tr.mac 05656 Oct 03 2013 15:50:56 Input file contains definition of IASA transient DC2_JASA_th.out 59663 Oct 03 2013 18:00:52 Output file for thermal analysis of IASA DC2_1ASA_dtout 55483 Oct 03 2013 18:00:54 Output file contains thermal gradients of lAS A DC2_1ASA_st.out 06253 Oct 03 2013 18:01:02 Output file for stress analysis of IASA SVO Transient svo_tr.mac 13828 Oct 03 2013 15:51:47 Input file contains definition of SVO transient DC2_SVO_th.out 42410 Oct 03 201318:01:18 Output file for thermal analysis of SVO DC2_SVO_dtout 29021 Oct 03 2013 18:01:20 Output file contains thermal gradients of svo DC2_SVO_st.out 43057 Oct 03 2013 18:01:29 Output file for stress analysis of SVO Fatigue Usage Factor Calculation F _M+B_HA_182.out 29510 Oct 03 2013 18:01:34 Stress range results for membrane

+ bending stresses F _M+B_HA_182_A.out 64248 Oct 03 2013 18:02:16 Stress range results for membrane+

bending stresses F _M+B_HA_376.out 51428 Oct 03 2013 18:01:45 Stress range results for membrane+

bending stresses F _M+B_HA_376_A.out 47829 Oct 03 2013 18:02:26 Stress range results for membrane

+ bending stresses F _M+B_HA_600.out 08232 Oct 03 2013 18:01:51 Stress range results for membrane

+ bending stresses F _M+B_HA_600_A.out 07596 Oct 03 2013 18:02:32 Stress range results for membrane

+ bending stresses F _M+B_HA_690.out 01543 Oct 03 2013 18:02:03 Stress range results for membrane

+ bending stresses F _M+B_HA_690_A.out 59300 Oct 03 2013 18:02:42 Stress range results for membrane

+ bending stresses Page 92 Controlled Document A ARE VA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary File Name F _M+B_HA_213.out F _M+B_HA_213_A.out F _M+B_LA_508.out F _M+B_LA_508_A.out F _TOT _HA_182.out F _TOT _HA_182_A.out F _TOT _HA_376.out F _TOT _HA_376_A.out F _TOT _HA_600.out F _TOT _HA_600_A.out F _TOT _HA_690.out F _TOT _HA_690_A.out F _TOT_HA_213.out F _TOT_HA_213_A.out F _TOT _LA_508.out F _TOT _LA_508_A.out vm56.out vm56.vrt vm112.out vm112.vrt DC2_fr_old_path.out Fr_Pathlocs.out DC2_HUCD_fr_SY.out DC2_HUCD_fr_SZ.out DC2_HUCD_fr_

TH.out Checksum Modified Date Time 10543 Oct 03 2013 18:01:39 43573 Oct 03 2013 18:02:21 19912 Oct 03 2013 18:02:12 59711 Oct 03 2013 18:02:47 21086 Oct 03 2013 18:02:52 25975 Oct 03 2013 18:03:34 35155 Oct 03 2013 18:03:04 28171 Oct 03 2013 18:03:44 23771 Oct03201318:03:10 41108 Oct 03 2013 18:03:49 25709 Oct 03 2013 18:03:21 00001 Oct 03 2013 18:03:59 44663 Oct 03 2013 18:02:58 35064 Oct 03 2013 18:03:39 63599 Oct 03 2013 18:03:30 36798 Oct 03 2013 18:04:05 ANSYS Verification Files 41461 Oct03201316:41:13 40729 Oct03201316:41:13 11272 Oct 03 2013 16:40:56 46559 Oct 03 2013 16:40:56 Fracture for Appendix A 23204 Oct 04 2013 09:31:23 07208 Oct 04 2013 09:31:23 43320 Oct 04 2013 09:31:23 62604 Oct 04 2013 09:31:23 02629 Oct 04 2013 09:31:23 Description Stress range results for membrane

+ bending stresses Stress range results for membrane

+ bending stresses Stress range results for membrane+

bending stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses Stress range results for total stresses 2-D 8-node structural element 2-D 8-node structural element 2-D 8-node thermal element 2-D 8-node thermal element Output files contains definition for fracture calculation Output files contains path point distances from the inside nodes Output file contains stress components along the fracture paths for HUCD transient Output file contains stress components along the fracture paths for HUCD transient Output file contains temperatures along Page 93 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary File Name Checksum Modified Date Time Description the fracture paths for HUCD transient Output file contains stress components DC2_LDLI_fr_SY.out 09561 Oct 04 2013 09:31:15 along the fracture paths for LOLl transient Output file contains stress components DC2_LDLI_fr_SZ.out 50981 Oct 04 2013 09:31:15 along the fracture paths for LOLl transient DC2_LDLI_fr_

TH.out 58283 Oct 04 2013 09:31:15 Output file contains temperatures along the fracture paths for LOLl transient Output file contains stress components DC2_LLD_fr_SY.out 08728 Oct 04 2013 09:31:16 along the fracture paths for LLD transient Output file contains stress components DC2_LLD _fr _ SZ. out 04504 Oct 04 2013 09:31:16 along the fracture paths for LLD transient DC2_LLD_fr_

TH.out 41124 Oct 04 2013 09:31:16 Output file contains temperatures along the fracture paths for LLD transient Output file contains stress components DC2_LOL_fr

_ SY. out 15738 Oct 04 2013 09:31:17 along the fracture paths for LOL transient Output file contains stress components DC2_LOL_fr_SZ

.out 46249 Oct 04 2013 09:31:17 along the fracture paths for LOL transient DC2_LOL_fr_

TH.out 09011 Oct 04 2013 09:31:17 Output file contains temperatures along the fracture paths for LOL transient Output file contains stress components DC2_LOP _fr_SY.out 47503 Oct 04 2013 09:31:19 along the fracture paths for LOP transient Output file contains stress components DC2_LOP _fr_SZ.out 28046 Oct 04 2013 09:31:19 along the fracture paths for LOP transient DC2_LOP _fr_ TH.out 49779 Oct 04 2013 09:31:19 Output file contains temperatures along the fracture paths for LOP transient Output file contains stress components DC2_LOF _fr_SY.out 25862 Oct 04 2013 09:31:19 along the fracture paths for LOF transient Output file contains stress components DC2_LOF _fr_SZ.out 16865 Oct 04 2013 09:31:19 along the fracture paths for LOF transient DC2_LOF _fr_ TH.out 65159 Oct 04 2013 09:31:19 Output file contains temperatures along the fracture paths for LOF transient DC2_RT _fr_SY.out 50489 Oct 04 2013 09:31:20 Output file contains stress components along the fracture paths for RT transient DC2_RT _fr_SZ.out 56676 Oct 04 2013 09:31:20 Output file contains stress components along the fracture paths for RT transient DC2_RT _fr_ TH.out 59558 Oct 04 2013 09:31:20 Output file contains temperatures along the fracture paths for RT transient Output file contains stress components DC2_ TRT _fr_SY.out 64394 Oct 04 2013 09:31:20 along the fracture paths for TRT transient DC2_ TRT _fr_SZ.out 38804 Oct 04 2013 09:31:20 Output file contains stress components Page 94 ControHed Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary File Name Checksum Modified Date Time Description along the fracture paths for TRT

transient DC2_ TRT _fr_ TH.out 16354 Oct 04 2013 09:31:20 Output file contains temperatures along the fracture paths for TRT transient Output file contains stress components DC2_1ASA_fr_SY.out 43199 Oct 04 2013 09:31:21 along the fracture paths for IASA transient Output file contains stress components DC2_1ASA_fr_SZ.out 60834 Oct 04 2013 09:31:21 along the fracture paths for IASA transient DC2_1ASA_fr_

TH.out 45152 Oct 04 2013 09:31:21 Output file contains temperatures along the fracture paths for IASA transient Output file contains stress components DC2_SVO_fr_SY.out 50107 Oct 04 2013 09:31:22 along the fracture paths for SVO transient Output file contains stress components DC2_SVO_fr_SZ.out 35035 Oct 04 2013 09:31:22 along the fracture paths for SVO transient DC2_SVO_fr_

TH.out 56485 Oct 04 2013 09:31:22 Output file contains temperatures along the fracture paths for SVO transient ANSYS Comparison comparison.xlsx 26601 Oct 04 2013 09:47:58 Stress comparison of ANSYS 11.0 and 14.0 Fracture for Appendix C DC2_fr_new_path.out 13159 Oct 08 2013 11:25:33 Output files contains definition for fracture calculation Fr_new_PathLocs.out 13999 Oct 08 2013 11:25:33 Output files contains path point distances from the inside nodes Output file contains stress components DC2_HUCD fr NewPath_SX.out 17800 Oct 08 2013 11 :24:53 along the fracture paths for HUCD transient Output file contains stress components

DC2_HUCD_fr_NewPath_SY.out 19076 Oct 08 2013 11:24:53 along the fracture paths for HUCD transient Output file contains stress components DC2_HUCD_fr_NewPath_SZ

.out 38392 Oct 08 2013 11:24:53 along the fracture paths for HUCD transient Output file contains stress components DC2_HUCD_fr_NewPath_Sh

.out 32532 Oct 08 2013 11 :24:53 along the fracture paths for HUCD transient DC2_HUCD_fr_NewPath_

TH.out 49107 Oct 08 2013 11:24:53 Output file contains temperatures along the fracture paths for HUCD transient Output file contains stress components DC2_LDLI_fr_NewPath_SX.out 35915 Oct 08 2013 11 :25:01 along the fracture paths for LOLl transient Output file contains stress components DC2_LDLI_fr_NewPath_SY.out 42153 Oct 08 2013 11:25:01 along the fracture paths for LOLl transient Page 95 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary File Name Checksum Modified Date Time Description Output file contains stress components DC2_LDLI_fr_NewPath_SZ.out 45742 Oct 08 2013 11:25:01 along the fracture paths for LDLI transient Output file contains stress components DC2_LDLI_fr_NewPath_Sh.out 40894 Oct 08 2013 11:25:01 along the fracture paths for LDLI transient DC2_LDLI_fr_NewPath_

TH.out 16447 Oct 08 2013 11 :25:01 Output file contains temperatures along the fracture paths for LDLI transient Output file contains stress components DC2_LLD_fr_NewPath_SX

.out 59180 Oct 08 2013 11 :25:09 along the fracture paths for LLD transient Output file contains stress components DC2_LLD _fr _NewPath_

SY. out 41648 Oct 08 2013 11 :25:09 along the fracture paths for LLD transient Output file contains stress components DC2_LLD_fr_NewPath_SZ.out 24752 Oct 08 2013 11:25:09 along the fracture paths for LLD . transient Output file contains stress components DC2_LLD_fr_NewPath_Sh.out 21732 Oct 08 2013 11 :25:09 along the fracture paths for LLD transient DC2_LLD_fr_NewPath_

TH.out 24282 Oct 08 2013 11:25:09 Output file contains temperatures along the fracture paths for LLD transient Output file contains stress components DC2_LOL_fr_NewPath_SX.out 13109 Oct 08 201311:25:15 along the fracture paths for LOL transient Output file contains stress components DC2_LOL_fr_NewPath_SY.out 36875 Oct 08 2013 11 :25:15 along the fracture paths for LOL transient Output file contains stress components DC2_LOL_fr_NewPath_SZ.out 20482 Oct 08 2013 11:25:15 along the fracture paths for LOL transient Output file contains stress components DC2_LOL_fr_NewPath_Sh.out

26337 Oct08201311:25:15 along the fracture paths for LOL transient DC2_LOL_fr_NewPath_

TH.out 46469 Oct 08 2013 11:25:15 Output file contains temperatures along the fracture paths for LOL transient Output file contains stress components DC2_LOP _fr_NewPath_SX.out 18800 Oct 08 2013 11 :25:20 along the fracture paths for LOP transient Output file contains stress components DC2_LOP _fr_NewPath_SY.out 33876 Oct 08 2013 11 :25:20 along the fracture paths for LOP transient Output file contains stress components DC2_LOP _fr_NewPath_SZ.out 31939 Oct 08 2013 11:25:20 along the fracture paths for LOP transient Output file contains stress components DC2_LOP _fr_NewPath_Sh.out 48017 Oct 08 2013 11 :25:20 along the fracture paths for LOP transient DC2_LOP _fr_NewPath_

TH.out 00906 Oct 08 2013 11 :25:20 Output file contains temperatures along the fracture paths for LOP transient DC2_LOF _fr_NewPath_SX.out 16427 Oct 08 2013 11 :25:24 Output file contains stress components along the fracture paths for LOF Page 96 Document A A.REVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary File Name Checksum Modified Date Time Description transient Output file contains stress components DC2_LOF _fr_NewPath_SY

.out 43482 Oct 08 2013 11:25:24 along the fracture paths for LOF transient Output file contains stress components DC2_LOF _fr_NewPath_SZ.out 32519 Oct 08 2013 11 :25:24 along the fracture paths for LOF transient Output file contains stress components DC2_LOF _fr_NewPath_Sh.out 48901 Oct 08 2013 11 :25:24 along the fracture paths for LOF transient DC2_LOF _fr_NewPath_

TH.out 08926 Oct 08 2013 11 :25:24 Output file contains temperatures along the fracture paths for LOF transient DC2_RT _fr _NewPath_

SX. out 28079 Oct 08 2013 11 :25:25 Output file contains stress components along the fracture paths for RT transient DC2_RT _fr_NewPath_SY.out 23652 Oct 08 2013 11 :25:25 Output file contains stress components along the fracture paths for RT transient DC2_RT _fr_NewPath_SZ

.out 12147 Oct 08 2013 11 :25:25 Output file contains stress components along the fracture paths for RT transient DC2_RT _fr_NewPath_Sh.out 19547 Oct 08 2013 11 :25:25 Output file contains stress components along the fracture paths for RT transient DC2_RT _fr_NewPath_

TH.out 39622 Oct 08 2013 11 :25:25 Output file contains temperatures along the fracture paths for RT transient Output file contains stress components DC2_ TRT _fr_NewPath_SX.out 04628 Oct 08 2013 11 :25:27 along the fracture paths for TRT transient Output file contains stress components DC2_ TRT _fr_NewPath_SY

.out 36174 Oct 08 2013 11 :25:27 along the fracture paths for TRT transient Output file contains stress components DC2_ TRT _fr_NewPath_SZ.out 33574 Oct 08 2013 11 :25:27 along the fracture paths for TRT transient Output file contains stress components DC2_ TRT _fr_NewPath_Sh

.out 06811 Oct 08 2013 11:25:27 along the fracture paths for TRT transient

DC2_ TRT _fr_NewPath_

TH.out 59357 Oct 08 2013 11 :25:27 Output file contains temperatures along the fracture paths for TRT transient Output file contains stress components DC2_1ASA_fr_NewPath_SX.out 07627 Oct 08 2013 11 :25:29 along the fracture paths for IASA transient Output file contains stress components DC2_1ASA_fr_NewPath_SY.out 24190 Oct 08 2013 11 :25:29 along the fracture paths for IASA transient Output file contains stress components DC2_1ASA_fr

_NewPath_

SZ. out 16655 Oct 08 2013 11:25:29 along the fracture paths for IASA transient Output file contains stress components DC2_1ASA_fr_NewPath_Sh.out 22483 Oct 08 2013 11 :25:29 along the fracture paths for IASA transient DC2_1ASA_fr_NewPath_

TH.out 02731 Oct 08 2013 11 :25:29 Output file contains temperatures along the fracture paths for IASA transient DC2_SVO_fr_NewPath_SX

.out 07270 Oct 08 2013 11 :25:33 Output file contains stress components Page 97 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary File Name Checksum Modified Date Time Description along the fracture paths for SVO transient Output file contains stress components DC2_SVO_fr_NewPath_SY

.out 12050 Oct 08 2013 11:25:33 along the fracture paths for SVO transient Output file contains stress components DC2_SVO_fr_NewPath_SZ.out 57834 Oct 08 2013 11:25:33 along the fracture paths for SVO transient Output file contains stress components DC2_SVO_fr_NewPath_Sh.out 08033 Oct 08 2013 11:25:33 along the fracture paths for SVO transient DC2_SVO_fr_NewPath_

TH.out 35999 Oct 08 2013 11:25:33 Outputfile contains temperatures along the fracture paths for SVO transient Page 98 Controlled Document A ARE VA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary APPENDIX C-STRESSES FOR SAFETY NOZZLE WOL FRACTURE MECHANICS ANALYSIS FOR OUTAGE 2R17 C.1 Purpose During 2013 outage (2R 17) inservice inspection indications were detected in the weld overlaid Pressurizer Safety/Relief Nozzles.

The indications are described in the Diablo Canyon Power Plant Design Input Transmittal (DIT) summarized in Reference

[18]. The purpose of this appendix is to provide stress and thermal results of the transient analysis for fracture mechanics evaluation along pathlines matching the detected indications in the Safety/Relief Nozzles. C.2 Path Lines Determination Per Reference

[18], rejectable indications are existed in safety nozzles A, 8 and C as shown in Figure C-1, Figure C-2, and Figure C-3, respectively.

The indications in nozzles A and 8 are located at the interface between WOL and nozzle. For nozzle C, there are two indications; indication C1 is located at the interface of WOL and nozzle while indication C2 is in the WOL near safe end to pipe weld. 1.61" Pressurizer

<-SA-508 Safety Nozzle "A" Alloy 82/182 Buttering Alloy 82/182 Weld Indication A 316 SS Safe-end lSI Examination Volume / Code Coverage Box Flow --4* 316 SS Piping Figure C-1: Safety Nozzle "A" Indication Plot Page 99 ControUed Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary 1--------2"

; I "A" Datum SA-508 Safety Nozzle "B" Indication 8 316 SS Piping 308 ss Weld Alloy 82/182 Weld 316 SS Safe-end Figure C-2: Safety Nozzle "B" Indication Plot 5.50" Pressurizer SA-508 Safety Nozzle "C" Indication C1 lSI Examination Volume Code Coverage Box Indication C2 316 SS Piping Flow-Alloy 82/182 Weld 308 ss Weld Figure C-3: Safety Nozzle "C" Indication Plot The path lines determined for fracture mechanics analysis are based on the indications shown above. Note that the stress analysis performed in this calculation uses a finite element model representing all the three Safety Nozzles.

The path lines in the finite element model are illustrated in Figure C-4 and described in Table C-1. The first two path lines (A_wol and A_noz) represent the indications A and C1. These two path lines are defined by the same nodes but different materials since the path is located at the interface of two different materials.

One of the path lines is using WOL material and second one is Page 100 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary using nozzle material properties by selecting respective materials in the post process analysis.

Since the indication A is not a straight line in Figure C-1, the path line is defined by four nodes along the interface between the WOL and nozzle materials.

Similar to the path line for indication A and C1, two path lines (B_wol and 8_noz) are defined to represent indication 8 with different materials assigned.

Indication C2 'is represented by path line C2_wol, which is completely within the WOL material.

Three more path lines (A_pln, 8_pln, and C2_pln) are defined to represent any assumed planar component of the existing laminar indications.

Note nozzle liner is not included in the planar path lines. Only the indications

(#1, #1 a) in Nozzle A is found to have any planar component and hence only path line A_pln is used further in the flaw evaluations.

8_pln and C2_pln are shown only for information purposes only. Table C-1: Path Lines Description Node lntermedi Node Path Line Numbers ate Node Numbers Location Material Start Numbers End A_wol Alloy 690 1464 1465,1466 1472 Indications A and C 1 A_noz SA-508, Cl.2 8_wol 1428 1462 Indication 8 Alloy 690 none 8_noz SA-508, Cl.2 C2_wol 275 none 278 Indication C2 Alloy 690 A_pln 1227 1467 Planar flaw cross Alloy 690 & SA-508, none indications A and C1 Cl.2 8_pln 1220, 1459 Planar flaw cross Alloy 690 & SA-508, none indication 8 Cl.2 C2_pln 1578, 1391 Planar flaw cross SA-182, F316L & SA-none indication C2 213, TP304 & Alloy690 Page 101 Cant oiled Document A ARE VA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary 1467 1459 SS Weld Y -axis (Axial) Figure C-4: Path Lines Defined for Fracture Mechanics Evaluation C.3 Stress and Temperature Evaluation The post processor calculation for fracture analysis is contained in computer file: DC2_fr_new_path.out Stresses along the path line in the global coordinate system with "y" axis along the nozzle axis are summarized at thirteen points separated by an equal distance from the inside node to the outside node. At each point the radial (Sx) stress, axial (Sy) stress, hoop (Sz) stress, shear (Sh) stress on XY surface, and the temperature (Th) in the weld or weld overlay are given. The path point distances from the inside nodes are included in the output file: Fr_new_Pathlocs.out ANSYS post processing output files are listed in Section 8.5 and the stresses and temperatures output results files for the fracture mechanics are listed below: DC2_HUCD_fr_NewPath_SX.out DC2_LOF _fr_NewPath_SX.out DC2_LDLI_fr_NewPath_SX.out DC2_RT _fr_NewPath_SX.out DC2_LLD_fr_NewPath_SX.out DC2_ TRT _fr_NewPath_SX.out DC2_LOL_fr_NewPath_SX.out DC2_1ASA_fr_NewPath_SX.out DC2_LOP _fr_NewPath_SX

.out DC2_SVO_fr_NewPath_SX.out DC2_HUCD_fr_NewPath_SY.out DC2_LOF _fr_NewPath_SY.out DC2_LDLI_fr_NewPath_SY.out DC2_RT _fr_NewPath_SY.out Page 102 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary DC2_LLD_fr_NewPath_SY.out DC2_ TRT _fr_NewPath_SY.out DC2_LOL_fr_NewPath_SY.out DC2_1ASA_fr_NewPath_SY.out DC2_LOP _fr_NewPath_SY.out DC2_SVO_fr_NewPath_SY.out DC2_HUCD fr NewPath_SZ.out DC2_LOF _fr_NewPath_SZ.out DC2_LDLI_fr_NewPath_SZ.out DC2_RT _fr_NewPath_SZ.out DC2_LLD_fr_NewPath_SZ.out DC2_ TRT _fr_NewPath_SZ.out DC2_LOL_fr_NewPath_SZ.out DC2_1ASA_fr_NewPath_SZ.out DC2_LOP _fr_NewPath_SZ.out DC2_SVO_fr_NewPath_SZ.out DC2_HUCD fr NewPath_Sh.out DC2_LOF _fr_NewPath_Sh.out DC2_LDLI_fr_NewPath_Sh.out DC2_RT _fr_NewPath_Sh.out DC2_LLD_fr_NewPath_Sh.out DC2_ TRT _fr_NewPath_Sh.out DC2_LOL_fr_NewPath_Sh.out DC2_1ASA_fr_NewPath_Sh.out DC2_LOP _fr_NewPath_Sh.out DC2_SVO_fr_NewPath_Sh.out DC2_HUCD_fr_NewPath_

TH.out DC2_LOF _fr_NewPath_

TH.out DC2_LDLI_fr_NewPath_

TH.out DC2_RT _fr_NewPath_

TH.out DC2_LLD_fr_NewPath_

TH.out DC2_ TRT _fr_NewPath_

TH.out DC2_LOL_fr_NewPath_

TH.out DC2_1ASA_fr_NewPath_

TH.out DC2_LOP _fr_NewPath_

TH.out DC2_SVO_fr_NewPath_

TH.out To investigate the magnitude and distribution of stresses at the existing indications, contour plots at the critical transients and time points are extracted.

An example is in transient HUCD where thermal gradients are large at time=13 and 18.6 hrs (see Figure 9). The contour plots of radial stress and shear stress at time=13 in HUCD are illustrated in Figure C-5 and Figure C-6, respectively.

The same plots for time=18.6 are illustrated in Figure C-7 and Figure C-8. It is found that stresses are higher at time=13, where the maximum radial stress at all the indications is about 4 ksi (indication A nozzle side) and maximum shear stress is about -6 ksi (indication A nozzle side). From Figure 8 through Figure 27, the maximum thermal gradient is at time=0.1 (hr) in transient IASA (Figure 25). Its radial stress and shear stress contour plots are provided in Figure C-9 and Figure C-1 0, respectively.

The maximum radial stress at all the indications is about 4 ksi (indication A nozzle side) and maximum shear stress is about -6 ksi (indication A nozzle side) and 6 ksi (indication AWOL side). Page 103 Controlled Document A AREVA Document No.32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure C-5: Radial Stress at Time [ ] (hr) in HUCD Figure C-6: Shear Stress at Time [ ] (hr) in HUCD Page 104 Controned Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure C-7: Radial Stress at Time [ ] (hr) in HUCD Figure C-8: Shear Stress at Time [ ] (hr) in HUCD Page 105 Controlled Document A AREVA Document No. 32-9219780-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure C-9: Radial Stress at Time [ ] (hr) in IASA Figure C-10: Shear Stress at Time [ ] (hr) in IASA Page 106 Controlled Document 0402-01-F01 (Rev. 018, 01/30/2014)

A AREVA CALCULATION SUMMARY SHEET (CSS) Document No. 32 9219813 -002 Safety Related:

C8J Yes D No ----------------------------------------

Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Title Analysis-NonProprietary PURPOSE AND SUMMARY OF RESULTS:

The purpose of this report is to document the weld residual stress finite element analysis of the pressurizer safety/relief nozzles of Diablo Canyon Unit 2 in support of the planned preemptive mitigation of primary water stress corrosion cracking (PWSCC) susceptible Alloy 82/182 dissimilar metal welds using PWSCC resistant Alloy 52M full structural weld overlays (SWOL). The state of stresses at shutdown (70°F) and steady state (653°F) after the completion of the SWOL, as predicted by the ANSYS Version 10.0 finite element analysis, are summarized to support flaw evaluations of the pressurizer safety/relief nozzle design. The purpose of Revision 002 is to revise the proprietary markings.

Proprietary information is contained within bold square brackets"[

]". Westinghouse proprietary information is contained within blue boxes. Non-Proprietary document for 32-9049062-006 THE FOLLOWING COMPUTER CODES HAVE BEEN USED IN THIS DOCUMENT:

CODENERSION/REV ANSYS Version 10.0 (Rev 000/001)

CODENERSION/REV ANSYS Version 14.0 I Windows 7 (Rev 003) THE DOCUMENT CONTAINS ASSUMPTIONS THAT SHALL BE VERIFIED PRIOR TO USE DYES C8J NO Page 1 of 32 c.ontrolled Docun1ent A AREVA 0402-01-F01 (Rev. 018, 01/30/2014)

Document No. 32-9219813-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Analysis

-NonProprietary Review Method:

Review (Detailed Check) D Alternate Calculation Signature Block P/R/A Name and Title and (printed or typed) Signature LP/LR Date Tom Riordan I Engineer III p Samer Mahmoud ( '2--1'1 Principal Engineer R Tim Wiger Unit Manager A

, Note: P/R/A designates Preparer (P), Reviewer (R}, Approver (A); LP/LR designates Lead Preparer (LP), Lead Reviewer (LR) Pages/Sections Prepared/Reviewed/

Approved All Al1 All Project Manager Approval of Customer References (N/A if not applicable)

Name Title (printed or typed) (printed or typed) Signature Date N/A Mentoring Information (not required per 0402-01)

Name Title Mentor to: (printed or typed) (printed or typed) (P/R) Signature Date N/A N/A Page2 AREVA Controlled Document 0402-01-F01 (Rev. 018, 01/30/2014)

Document No. 32-9219813-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Analysis-NonProprietary Record of Revision Revision Pages/Sections/Paragraphs No. Changed Brief Description I Change Authorization 000 All Original Release 001 css Added purpose of revision Throughout Proprietary markings of material names removed.

Throughout Added Westinghouse Proprietary Indicators 002 Throughout Proprietary markings updated Page 3 Controlled Document A AREVA Document No. 32-9219813-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Analysis-NonProprietary Table of Contents Page SIGNATURE BLOCK ...............................

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2 RECORD OF REVISION

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3 LIST OF TABLES .....................................................................................................................................

5 LIST OF FIGURES ...................................................................................................................................

6 1.0 PURPOSE ..................................................

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8 2.0 ANALYTICAL METHODOLOGY

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8 3.0 KEY ASSUMPTIONS

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9 4.0 DESIGN INPUT ...........................................

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.............. 9 4.1 Geometry

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9 4.2 Finite Element Model. ..............................................................................................

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1 0 4.3 Materials

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10 4.4 Welding Parameters

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... 11 4.5 Boundary Conditions

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............ 11 4.5.1 Thermal Analysis

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1_1 4.5.2 Structural Analysis

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12 5.0 FINITE ELEMENT RESULTS/SUMMARY

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12

6.0 REFERENCES

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13 7.0 COMPUTER OUTPUT ................................................................................................................

14 8.0 FIGURES SECTION ...................................................................................................................

15 APPENDIX A: AXIAL AND HOOP STRESS TABLES .......................................................................

A-1 APPENDIX B: VERIFICATION OF THE FINITE ELEMENT PROGRAM ..........................................

B-1 APPENDIX C: STRESS FOR EVALUATING NDE INDICATIONS

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C-1 Page4 Controlled Document A. AREVA Document No. 32-9219813-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Analysis-NonProprietary List of Tables Page Table 4-1: Dimensions of Safety/Relief Nozzle Design and SWOL .........................................................

9 Table 4-2: Component Material Designation

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10 Table 4-3: Welding Parameters

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11 Table 7-1: Computer Output Files for Fracture Mechanics Analysis*

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14 Table A-1: Through-wall axial and hoop stress distributions at shutdown (70°F) ................................

A-1 Table A-2: Through-wall axial and hoop stress distributions at steady state (653°F) ..........................

A-2 Table C-1: Bounding Radial and Shear Stresses for Interfacial Path lines ..........................................

C-3 Table C-2: Through-wall axial and hoop stresses for vertical path lines at shutdown (70°F) ..............

C-4 Table C-3: Computer Files ...................................................................................................................

C-5 Page 5 Controlled Document A AREVA Document No. 32-9219813-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Analysis-NonProprietary List of Figures Page Figure 1: Welding of the stainless steel safe end to the pressurizer safety/relief nozzle using Alloy 82/182 weld metal ...................................................................................................................

15 Figure 2: Removal of weld material from the inner surface of the DMW and replacement of the cavity with Alloy 182 weldment to simulate a weld repair. ................................................................

15 Figure 3: Welding of the liner to the inside surface of the nozzle ..........................................................

15

Figure 4: Welding of the stainless steel pipe to the safe end using stainless steel weld metal .............

16 Figure 5: Welding of an Alloy 52M SWOL onto the outer surface, covering the nozzle, the DMW, and the stainless steel weld ..................................................................................................

16 Figure 6: Finite element mesh for the safety/relief nozzle design and SWOL .......................................

17 Figure 7: Weld passes employed in the DMW .......................................................................................

18 Figure 8: Weld passes employed for the weld repair and in the stainless steel weld ............................

18 Figure 9: Weld passes employed in the SWOL and liner weld ..............................................................

18 Figure 10: Axial and hoop stress contours at shutdown (70°F) obtained by applying two operating load cycles following the completion of the SWOL ...........................................................

19 Figure 11: Axial and hoop stress contours at steady state (653°F) obtained by applying two-and-a-half operating load cycles following the completion of the SWOL .........................................

20 Figure 12: Path lines for axial and hoop stress distributions along the 10 surfaces

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21 Figure 13: Path lines for the through-wall axial WRS distribution in the OMW region and the stainless steel weld ..........................................................................................................................

21 Figure 14: Axial and hoop stress distributions along the DMW 10 surface at steady state (653°F) ............................................................................................................................................

. 22 Figure 15: Axial and hoop stress distributions along the liner weld 10 surface at steady state (653°F) .............................................................................................................................................

22 Figure 16: Through-wall axial stress distributions at shutdown (70°F) obtained by applying two operating load cycles following the completion of the SWOL ...........................................................

23 Figure 17: Through-wall hoop stress distributions at shutdown (70°F) obtained by applying two operating load cycles following the completion of the SWOL. ..........................................................

23 Figure 18: Through-wall axial stress distributions at steady state (653°F) obtained by applying two-and-a-half operating load cycles following the completion of the SWOL shutdown

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24 Figure 19: Through-wall hoop stress distributions at steady state (653°F) obtained by applying two-and-a-half operating load cycles following the completion of the SWOL ...................................

24 Page6 Controlled Document A AREVA Document No. 32-9219813-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Analysis-NonProprietary List of Figures (continued)

Page Figure C-1: Safety Nozzle A Path lines .................................

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C-1 Figure C-2: Safety Nozzle B Path lines ...............................................................

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C-2 Figure C-3: Safety Nozzle C Path lines ...............................................................................................

C-2 Page 7 ControUed Document A AREVA Document No. 32-9219813-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Analysis-NonProprietary 1.0 PURPOSE Alloy 600 and its associated weldments Alloy 82/182 are susceptible to primary water stress corrosion cracking (PWSCC).

Pacific Gas and Electric plans to mitigate PWSCC in the Diablo Canyon Unit 2 pressurizer nozzle Alloy 82/182 dissimilar metal weld (DMW) with full structural weld overlays (SWOL) using PWSCC resistant Alloy 52M. The planned mitigation using Alloy 52M SWOL is a preemptive measure to reduce the PWSCC susceptibility of the DMW. A weld residual stress (WRS) finite element analysis for the pressurizer safety/relief nozzle is performed to develop WRS distributions in support of the fracture mechanics analysis of postulated flaws in the DMW and the stainless steel weld (SSW) between the safe end and piping. 2.0 ANALYTICAL METHODOLOGY The WRS finite element analysis is carried out per the Reference

[1] WRS analysis procedure.

The various stages of the welding processes for the structural components, the weld repair, and the SWOL, including the intervening load histories, are simulated in the finite element analysis using the following sequential steps: 1. Welding of the stainless steel safe end to the pressurizer safety/relief nozzle using Alloy 82/182 weld metal. 2. Removal of weld material from the inner surface of the DMW and replacement of the cavity with Alloy 182 weldment to simulate a weld repair. 3. Welding of the liner to the inside surface of the nozzle. 4. Simulation of hydro test. 5. Welding of the stainless steel pipe to the safe end using a stainless steel weld metal. 6. Simulation of hydro test. 7. Simulation of operational loads. 8. Welding of an Alloy 52M SWOL onto the outer surface, covering the nozzle, the DMW, and the stainless steel weld. 9. Simulation of operational loads. Figure 1 to Figure 5 illustrate these stages. The general purpose finite element code ANSYS [2] is used to perform the WRS finite element analysis.

The finite element analysis is based on a two-dimensional axisymmetric model. The basic steps comprising the multi-pass welding simulation of the DMW, the weld repair, the stainless steel weld, and the SWOL are as follows:

Develop the finite element model considering features necessary to accommodate weld pass deposition and weld repairs.

Define the temperature range for melting (solidus and liquidus temperatures).

Define thermal and mechanical temperature dependent material properties from room temperature up to and including the melting region.

Define thermal and structural boundary conditions.

Define volumetric heat sources from welding procedure specifications.

Page 8 Controlled Document A AREVA Document No. 32-9219813-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Analysis-NonProprietary

Thermal phase using the ANSYS "birth and death" feature o Deactivate finite elements in all weld passes. o Activate one weld pass at a time and perform transient thermal analysis to develop the history of the temperature field for subsequent structural analysis.

Structural phase using the ANSYS "birth and death" feature o Deactivate elements in all weld passes. o Activate one weld pass at a time and perform static structural elastic-plastic analysis using the temperature history from the thermal phase.

Perform additional static load steps to simulate hydrostatic

testing, steady state operation, and thermal cycling.

3.0 KEY ASSUMPTIONS There are no major assumptions for this calculation.

Minor assumptions are noted where applicable.

4.0 DESIGN INPUT 4.1 Geometry The detailed dimensions of the safety/relief nozzle design and SWOL modeled in the WRS finite element analysis are obtained from [3] and [4] and are shown in Table 4-1. Table 4-1: Dimensions of Safety/Relief Nozzle Design and SWOL -...... -I Min Weld Overlay Thickness (at nozzle side) I [ ] I Page 9 Controlled Document A AREVA Document No. 32-9219813-002 Diablo Canyon Unit 2 Pressurizer Safety/Relief Nozzle Weld Overlay Residual Stress Analysis-NonProprietary 4.2 Finite Element Model The finite element model is a two-dimensional axisymmetric model. The finite element mesh consists of ANSYS four-node thermal (axisymmetric PLANE55) and structural (axisymmetric PLANE182) elements.

The B-bar method of selective reduced integration is used for the structural elements in order to avoid mesh locking due to near incompressibility condition at large plastic strains.

The weld pass depositions are simulated using ANSYS' element "birth and death" feature.

The finite element mesh for the safety/relief nozzle design and SWOL is shown in Figure 6. The DMW and stainless steel welds are sufficiently separated from the boundaries of the model that the "end effects" do not significantly affect stresses in the welds. The dimensions of the finite element model are developed per drawings

[3] and [4]. The weld passes employed in the DMW, the weld repair, the stainless steel weld, and the SWOL are shown in Figure 7, Figure 8, and Figure 9, respectively.

4.3 Materials Reference

[5] provides the component material designation of various components modeled in the WRS analysis, as summarized in Table 4-2. Table 4-2: Component Material Designation Component Material Designation Nozzle SA-508 Class 2 Safe End SA-182 Grade F316L Nozzle to Safe End Weld Alloy 82/182 Buttering Weld Alloy 182 Liner SA-213 TP 304 stainless steel Pipe SA-376 Grade TP316 Safe End to Pipe Weld E308 austenitic stainless steel filler Weld Overlay Alloy52M The analysis herein uses the physical properties (thermal conductivity, specific heat, mean coefficient of thermal expansion,

density, Young's modulus, and Poisson's ratio) and the stress-strain curves from Reference

[6] that are representative of the materials in Table 4-2. All of the physical and mechanical properties, except the Poisson's ratio, are temperature dependent.

The multi-linear kinematic hardening model in ANSYS is employed in the elastic-plastic structural analysis.

Temperature dependent, true stress-strain material properties are used with the multi-linear kinematic hardening model for simulating the structural phase of the welding procedure.

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6.0 REFERENCES

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