ML14259A314

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Relief Request SWOL-REP-1-U2: Submittal of Revised Areva Calculations. Part 6 of 15
ML14259A314
Person / Time
Site: Diablo Canyon Pacific Gas & Electric icon.png
Issue date: 09/15/2014
From:
AREVA
To:
Office of Nuclear Reactor Regulation
Shared Package
ML14259A323 List:
References
DCL-14-084 32-9219781-002
Download: ML14259A314 (59)
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Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 8-G Cnni-Dnwn with '"emperature Drop of 405°F -. ----. . -.... --Page 36 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary T bl 8 7 C I D a e own "th T E I S anv w1 t empera ure D rop o --.-. ---------

-

-

... Page 37 ControUed Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 8-8 Cool-Down Snrav with Drop of 320°F -. -. ---I . ---I ---.. --... Page 38 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 8-9 Unit Loading & Unit Unloading at 5o/o of Full Power Transients I--. . .... --Table 8-10 Laroe Steo Ot:: .... lt::o: e in Load Transient --. I .... -... Page 39 Controned Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 8-11 Load lln ..

of 10° gf Full Power Transient

-. -. . ---Page 40 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 8-12 Step Load Decrease of 10% of Full Power Transient -. I ---Page41 ControUed Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 8-13 Boron Concentration Transient 1 -I"" . . -----... -... Table 8-14 Loss of Lo d Transient

.... -I"" I . I 1-1-1-1-1-1-1-t-1---... Page 42 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 8-15 Loss of Power Transient

I-. --------------------------------.. Page 43 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 8-1A I nc;:c;: nf Flnw Transient

--. . I --.---I ----*-I -----I ------I -------Page 44 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary T bl 8 17 R t T -T t 1 a e -eac or n rans1en --. . -------------... 1 All three reactor trip transients defined in Reference

[ 4] (Table 23 through Table 25) are identical for the spray nozzle. Page 45 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary R-1R I ... ..... ""41ndli -v Spray Transient I'"'" --... Table 8-19 Turbine Roll Test Transient -"" I "" I f-r-f-f-f-r-r-f-;--;-.... --Page 46 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary The detailed thermal loading due to these transients were applied to the thermal finite elen1ent model in the form of fluid and steam temperatures and HTC versus time. The computer input files containing defmition of these transients are: HU-ES_tr.inp PLPU _ tr.inp LSL_tr.inp HU-LS _ tr.inp BCE_tr.inp SLD_tr.inp CD-ES320 _tr.inp IA_tr.inp SLI_tr.inp CD-ES405 _ tr.inp LOF_tr.inp RT_tr.inp CD-LS320 _tr.inp LOL_tr.inp TRT_tr.inp CD-LS405 _tr.inp LOP_tr.inp The computer output files for the thennal analyses of the transients are: min HU-ES th.out min PLPU th.out min LSL th.out ------tnin HU-LS th.out min BCE th.out min SLD th.out min CD-ES320 th.out min IA th.out min SLI th.out --min CD-ES405 th.out min LOF th.out min RT th.out ----min CD-LS320 th.out min LOL th.out min TRT th.out ------min CD-LS405 th.out min LOP th.out ----The results of the thermal analyses are* evaluated by examining the magnitude of tetnperature differences between key locations of the model (Figure 8-2). The computer input file "min dT.mac" contains defmitions of the node numbers for temperature (Table 8-20) and temperature gradients calculation (Table 8-21). The time points of the maximum tetnperature gradients are those at which the maximum thermal stresses develop. The temperature and temperature gradients are plotted in Figure 8-3 through Figure 8-19. These figures are used only to show the trend. Specific data are taken from the computer output files. The computer output files that provide the temperatures at the selected locations are: min HU-ES dt.out min PLPU dt.out nun LSL dt.out -----*-min HU-LS dt.out min BCE dt.out min SLD dt.out ------min CD-ES320 dt.out min IA dt.out min SLI dt.out --min CD-ES405 dt.out min LOF dt.out min RT dt.out ----min CD-LS320 dt.out nun LOL dt.out min TRT dt.out ------min CD-LS405 dt.out min LOP dt.out ----Page 47 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 8-20 Nodes of Interest for Evaluation of Temperature Gradients Location Node Number Description 2 1660 Pipe 3 262 Weld Overlay 4 1782 PipeiD 5 1270 Weld Overlay OD at top of the WOL 6 1348 Piping Weld ID at ss weld location 7 1143 Weld Overlay OD near SS weld location 8 1516 Liner to Safe End Weld ID 9 1222 Weld Overlay OD near DM weld 10 7989 Liner ID 11 1289 Weld Overlay 00 at bottom of WOL 12 1371 Nozzle/Head Interior Corner (base metal) 13 1421 Nozzle/Head Exterior Corner Table 8-21 Temperature Gradients of Interest Gradient Gradient Gradient Description Designation Location 21 2 to 3 Pipe to Weld Overlay 22 4 to 5 Pipe ID to Weld Overlay OD 23 6 to 7 Piping Weld 10 to Weld Overlay OD 24 8 to 9 Liner to Safe End Weld ID to Weld Overlay OD 25 10 to 11 Liner 10 to Weld Overlay OD 26 12 to 13 Head ID (base metal) to Head OD Page 48 Document A .AREV.A Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-2 Location Numbers for Evaluation of Temperature Gradients Page 49 Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-3 Heat-Up Early Spray Transient Page 50 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-4 Heat-Up Late Spray Transient Page 51 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-5 Cool-Down Early Spray with Temperature Drop of 405°F Page 52 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-6 Cool-Down Late Spray with Temperature Drop of 405°F Page 53 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-7 Cool-Down Early Spray with Temperature Drop of 320°F Page 54 Controlled Document A A.REVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-8 Cool-Down Late Spray with Temperature Drop of 320°F Page 55 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-9 Unit Loading & Unit Unloading at So/o of Full Power Transients Page 56 Controlled Document A AREVA Document No. 32-9219781

-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-10 Large Step Decrease in Load Transient Page 57 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8*11 Step Load Increase of 1 Oo/o of Full Power Transient Page 58 Document A Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-12 Step Load Decrease of 10°/o of Full Power Transient Page 59 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-13 Boron Concentration Equalization Transient Page 60 ControUed Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-14 Loss of Load Transient Page 61 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-15 Loss of Power Transient Page 62 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-16 Loss of Flow Transient Page 63 Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-NonProprietary Figure 8-17 Reactor Trip Transient Page 64 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-18 Inadvertent Auxiliary Spray Transient Page 65 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 8-19 Turbine Roll Test Transient Page 66 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 9 STRUCTURAL ANALYSIS Stress analyses are performed at the time points listed in Table 9-1 through Table 9-17. The titne points include those at which the maximum tetnperature gradients (n1aximwn thermal stresses) and the maximum and minimum pressures occur , as well as those of analytical interest.

The nodal temperature at the particular time point is read into the structural model directly from the result file of the thermal analysis.

The corresponding pressure is obtained from the transient input macros. The computer output files for the structural analyses are: min HU-ES stout min PLPU stout nun LSL s t out ------min HU-LS st. out min BCE stout min SLD stout ------nun CD-ES320 stout tnin IA stout tnin SLI stout min CD-ES405 stout min LOF stout min RT stout ----min CD-LS320 stout tnin LOL stout min T RT stout ------min CD-LS405 stout min LOP stout ----Table 9-1 Time Points of Interest -HU-ES Page 67 Controlled Document A A.REVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 9-2 Time Points of Interest-HU-LS Table 9-3 Time Points of Interest-CD-ES405 Page 68 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 9-4 Time Points of Interest-CD-LS405 Table 9-5 Time Points of Interest-CD-ES320 Page 69 ControUed Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 9-6 Time Points of Interest -CD-LS320 Table 9-7 Time Points of Interest -PLPU Table 9-8 Time Points of Interest -LSL Page 70 ControUed Document A AREV.A Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 9-9 Time Points of Interest-SLI _,....._Table 9-10 Time Points of Interest-LOL Table 9-11 Time Points of Interest -SLD Table 9-13 Time Points of Interest -LOP Table 9-12 Time Points of Interest-BC Page 71 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 9-14 Time Points of Interest-LOF Table 9-15 Time Points of Interest -RT Table 9-16 Time Points of Interest -lA Table 9-17 Time Points of Interest-TRT Page 72 Document A AREVA. Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 10 ASME CODE CRITERIA The ASME Code stress analysis 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 loading. In general, the primary stress intensity criteria of the ASME Code (Reference

[ 14]) assure that the design is adequate for application of design loads. Also , the ASI\ffi Code criteria for cumulative fatigue usage factor assure that the design is adequate for repetitive loading. 10.1 ASME Code Primary Stress Intensity (SI) Criteria Per NB-3213.8 of Reference

[14], 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 primary stress intensity criteria are specified in: NB-3221 for Design Conditions , NB-3223 for Level B (Upset), NB-3224 for Level C (E1nergency), NB-3225 for Level D (Faulted) and NB-3226 for Test Conditions.

The primary stress intensity criteria are the basic requirements in calculating the weld overlay size, which is under the assumption that a

  • 360° circumferential flaw has grown co1npletely 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 materials to the nozzle outside region relieves primary stress burden resulting from internal pressure and external loads. Therefore, the primary stress intensity require1nents for the nozzle , welds, safe end and pipe have been satisfied for all service levels without the need for further evaluation.

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

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

[14]), which were addressed in the original nozzle/pressurizer designs. Adding weld overlay will increase the nozzle wall thickness , and therefore, these requirements are satisfied.

10.2 ASME Code Primary + Secondary Stress Intensity (SI) Criteria The analyses of stresses for transient conditions are required to satisfy the requirements for the secondary SI range and repetitive loadings.

The following discussion describes the primary + secondary SI range evaluation and fatigue analysis process employed herein for the design. Overall stress levels are reviewed and assessed to determine which locations require detailed stress/fatigue analysis. The objective is to assure that: 1) The highly stressed locations affected by implementation of SWOL are evaluated.

2) The specified region is quantitatively qualified. Page 73 Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Sp r ay Nozzle Weld Overlay Structural Analysis-Non Proprietary Once specific locations for detailed stress evaluation are established , the related paths lines can be defmed with ANSYS. A post-processing is then conducted to convert 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 ASME Code (Reference

[14]). For paths that go through two materials partial paths are taken in addition to the free edge to free edge. 1 0.2.1 Path Stress Evaluation The ANSYS Post Processor is used to tabulate the stresses along predetermined paths and classify them in accordance with the ASME Code Criteria (i.e., membrane , me1nbrane plus bending , total and peak stress). The paths are shown in Figure 10-1 and are described in Table 10-1. The stress linearization for all transients is documented in computer file "min_yaths.out".

Table 10-1 Path Definition Path Name Inside Outside Node No. Node No. Path Name Inside Outside Node No. Node No. Path1 1371 1421 Path7 1313 3190 Path2 1433 1372 Path7A 1313 1165 Path3 5125 3156 Path7B 1165 3190 Path3A 5125 1248 PathS 3765 1136 Path3B 1248 3156 Path8A 3765 1140 Path4 1484 3249 Path8B 1140 1136 Path4A 1484 1188 Path9 5948 1270 Path4B 1188 3249 Path9A 5948 3281 PathS 1317 3209 Path9B . 3281 1270 Path5A 1317 1212 Path10 5951 1852 Path 58 1212 3209 Path6 1336 1179 Path6A 1336 1209 Path6B 1209 1179 Page 74 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Figure 10-1 Stress Paths through the Spray Nozzle Model Full through thickness paths are taken at the satne location as the partial paths (AlB). The partial path name has the letter 'A' or 'B' behind the full path name. Note: The path's nun1bering starts from the nun1ber "2". The pathline "Pathl" is not defined. Page 75 Controlled Document A .AREV.A Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 1 0.2.2 Applicable Stress Intensity Due to External Loads The spray nozzle is exposed to the external loads. The stress intensities applicable for primary + secondary qualification due to these loads were calculated in Section 6. The membrane stress due to internal pressure is not considered here , since this is already included in the ANSYS transient runs. The OBE + Thermal external loads combination produces highest stress intensities at all evaluated locations. Therefore stress intensities fr01n Table 6-9 has been conservatively added to the maximum transient SI ranges from the ANSYS runs in the following sections.

1 0.2.3 Maximum Primary + Secondary Stress Intensity Range The computer program StressRange version 2.0 (Reference

[15]) is used to calculate membrane + bending stress intensity range and total stress intensity range based on the method prescribed in paragraph NB-3216.2 of the ASME Code. The computer run containing the results of the stress range calculation for membrane + bending stress for all transient events ts "min _paths(M+B).txt".

A zero stress state (ZSS) is included in this run. The men1brane

+ bending stress intensity range rutls are conservatively combined by hand with the stresses due to external loads (calculated in Section 6). The summary of maximum membrane +bending stress intensity ranges is tabulated in Table 10-2. 1 0.2.4 Primary + Secondary (P+Q) Stress Intensity Range Qualification

{NB 3222.2) The maximun1 tnembrane

+ bending stress intensity range , as calculated in the stress range rutl "min_paths(M+B).txt" , are conservatively combined with the maximum stress intensities due to external loads from Table 6-9 (as discussed in Section 10.2.2 ). Note , that Table 6-9lists only SI for the through-wall paths. The SI from outside node of these paths is conservatively used for the partial path-mid-wall locations (outside node of" PathA" and inside node of" PathB"). The smn of t he maximum transient SI Range and the stress intensity due to e x ternal loads are compared directly to the primary + secondary stress intensities range criteria of the ASME Code. Table 10-2 provides a summary of the maximum stress intensity ranges and allowable limits along with the material and path designation.

Table 10-2 shows that the 3Sm limit is not met at the following locations: Inside node of paths: Path5 , Path7 , Path7A, Path8 , Path8A , Path10 Outside node of paths: Path8 , Pathl 0 For the ren1aining locations , the requirement is met. The load-step combinations for locations which exceed 3Sm limit are shown in Table 10-3. The ASME Code allows that the 3*Sm limit n1ay be exceeded under special condition , one of them being that the Simplified Elastic-Plastic Analysis (NB-3228.5) is used in the fatigue analysis.

See Section 10.2.5 for further qualification.

Page 76 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 10-2 Summary of Maximum Primary + Secondary 51 Ranges for M + B Stresses Transient Stresses + Allowable Material External Stresses 3Sm limit at 680°F 1 [ksi] Path StRange StRange Outside Outside Inside Node Outside Inside Node Node Inside Node Node (ksi] Node (ksi)-"' Path2 80.1 80.1 SA-508 SA-508 Path3 80.1 69.9 SA-508 Alloy690 Path3A 80.1 80.1 SA-508 SA-508 Path3B 69.9 69.9 Alloy690 Alloy690 Path4 69.9 69.9 Alloy600 Alloy690 Path4A 69.9 69.9 Alloy600 Alloy600 Path4B 69.9 69.9 Alloy690 Alloy690 Path5 41.1 69.9 SA-182 Alloy690 Path5A 41.1 41.1 SA-182 SA-182 Path 58 69.9 69.9 Alloy690 Alloy690 Path6 41.1 69.9 SA-182 Alloy690 Path6A 41.1 41.1 SA-182 SA-182 Path6B 69.9 69.9 Alloy69o Alloy690 Path7 41.1 69.9 SA-182 Alloy690 Path7A 41.1 41.1 SA-182 SA-182 Path7B 69.9 69.9 Alloy690 Alloy690 PathS 45.6 69.9 SA-213 Alloy690 Path8A 45.6 45.6 SA-213 SA-213 Path8B 69.9 69.9 Alloy690 Alloy690 Path9 49.2 69.9 SA-376 Alloy690 -Path9A 49.2 49.2 SA-376 SA-376 Path9B 2 69.9 69.9 Alloy690 Alloy690 Path10 49.2 49.2 SA-376 SA-376 --1 The Sm values are conservatively taken at 680°F (maximum transient temperahrre) 2 The entire through thickness section needs to act together in order for ratcheting to occur. Since partial path " Path9A" is much longer and stiffer than Path9B , the behavior of the section is driven by Path9A. Since Path9A material does not ratchet (3Sm limit is satisfied), it can be deduced that the adjacent material Path9B can not ratchet either. Therefore , Path9B is acceptable without satisfYing the 3Sm limit. Page 77 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 10-3 Load Step Combinations for the Locations that Exceed 3Sm Limit Path Load Step Combination Inside Node Outside Node Path5 119-301 CD-LS320 (7 .643 hr) -lA (2.239 hr) -Path7 135-305 CD-ES405 (2.19267 hr)-lA (2.3499 hr) -Path7A 134-305 CD-ES405 (2.191 hr) -lA (2.3499 hr) -134-237 134-237 PathS CD-ES405 (2.191 hr)-LOL (0.005235 hr) CD-ES405 (2.191 hr)-LOL (0.005235 hr) Path SA 134-305 CD-ES405 (2.191 hr) -lA (2.3499 hr) -134-237 134-236 Path10 CD-ES405 (2.191 hr)-LOL (0.005235 hr) CD-ES405 (2.191 hr)-LOL (0.003512 hr) 1 0.2.5 Simplified Elastic-Plastic Analysis (NB-3228.5)

The maximun1 primary+secondary stress intensity criterion in Section 10.2.4 is not met for the location at specific load step combinations determinate in Section 10.2.4. Therefore, the simplified elastic-plastic analysis for these locations is provided in this section. The primary + secondary stress intensity range may exceed 3

  • Sm if the requirements of the simplified elestic-plastic analysis are met. The requirements are: 1) Primary+ Secondary Sl Range (Excluding thermal bending stresses), NB-3228.5(a)

The range of primary + secondary membrane + bending stress intensity, excluding thermal bending, shall be::; 3*Sm. The computer program StressRange v2.0 (Reference

[15]) is used to calculate primary plus secondary membrane plus bending stress intensity, excluding the thermal bending stress intensity range. The bending stress due to pressure only is determined by multiplying the bending stress obtain from design linearization file "'min _DC _paths.out" with a pressure ratio. The ratio is the pressure at the time point constituting the maximum membrane + bending SI range, divided by the design pressure of2485 psig at 680°F. The applied temperature effects only physical material properties, therefore the effect of thermal bending is considered to be negligible.

The prorated bending stress is added to the membrane stress and external stress in determining the membrane + bending SI range excluding thermal bending effect. The run containing the results of the stress range calculation is "min_paths(M+B-ThBend).txt".

Note that the zero stress state (ZSS) is included in this run. Table 10-4lists the range of primary plus + secondary membrane plus bending stress intensity, excluding thermal bending for locations and load step combinations where the 3Sm litnit was exceeded (see Table 10-3). Page 78 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 10-4 51 Ranges of Maximum Primary+ Secondary Membrane Plus Bending Stress Excluding Thermal Bending Stresses Transient Stresses + Allowable Material External Stresses 35m limit at )80°F Path 51 Range 51 Range Outside Outside Inside Node Outside Inside Node Node Inside Node Node _ [ksi] Node [ksi] -Path5 SA-182 -Path7 SA-182 -Path7A SA-182 -PathS SA-213 Alloy690 PathS A SA-213 -Path10 SA-376 SA-376

The SI Ranges of maximum primary + secondary membrane plus bending stress excluding thermal bending stress does not exceed the 3Sm lnnit at all locations.

The criterion is met. 2) Factor Ke (NB-3228.5(b))

The values of Sa used for entering the design fatigue curve is multiplied by the factor Ke where 1-n ( S ) K tl=l.O+ ,_n __ l n . (m -1) 3 . s m m= 1.7 n= 0.3 Sm [ksi] Sn [ksi] for S >3*m*S n-m for austenitic stainless steel from Table NB-3228.5 (b)-1 (Reference

[14]) for austenitic stainless steel from Table NB-3228.5 (b)-1 (Reference

[14]) at average temperature of the metal at the critical time points Primary + Secondary membrane plus bending SI Range The Ke factor is calculated for each SI Ranges over the 3 Sm limit in the fatigue check as documented in Section 10.2.6. Page 79 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary

3) Fatigue Usage Factor (NB-3228.5© and NB-3222.4)

For fatigue usage factor evaluation see Section 10.2.6. 4) Thermal Stress Ratchet (NB-3228.5( d) and NB-3222.5)

Thermal Ratchet is considered for the locations at specific load step, where the 3 Sm limit was not met (see Section 10.2.4) Son1e of these locations are parts of the local geometric discontinuities.

The ASME Code requirements for thermal ratcheting are considered accurately only for cylindrical shells without discontinuities.

On the other hand, the requirements for thermal ratcheting at discontinuities are considered to be "probably overly conservative" (Reference

[16], page 207). Maximum Allowable Range of Thermal Stress (NB-3222.5):

Table 10-4 detennines the n1aximum allowable ranges of thermal stresses.

NB-3222.5 only requires the SI Range to include thermal SI Ranges. Therefore, the stress analyses due to temperature loads only are performed at all time-points, similar to structural analysis in Section 9, with pressure = 0. The computer output files are: min HU-ES rtch.out min PLPU rtch.out min LSL rtch.out ------min HU-LS rtch.out 1nin BCE rtch.out min SLD rtch. out ------min CD-ES320 rtch.out Inin lA rtch. out min SLI rtch.out --min CD-ES405 rtch.out Inin LOF rtch.out nlin RT rtch.out ----min CD-LS320 rtch.out min LOL rtch.out min TRT rtch.out ------min CD-LS405 rtch.out min LOP rtch.out ----The stress linearization for the transient runs is documented in the file "min _yaths _rtch.out".

The SI ranges for thermal only are obtained fron1 "min _yaths _ rtch(M+B).txt".

The general primary membrane stresses "Pm" due to pressure for load step combinations listed in Table 10-3 are calculated from the general primary membrane stresses at design condition (2485 psig) multiplied by pressure ratios. The pressure ratio for specific load step is given by actual pressure at this load step [psig] divided by design pressure [psig]. The higher "Pm" of two time points is used for determination of the Allowable SI Range. The general primary membrane stresses "Pn1" are shown in Table 10-5 and the men1brane stresses for all defmed paths at design condition are documented in ANSYS output files "min_ DC _yaths. out". Page 80 Controlled Document A .AREV.A Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 10-5 General Membrane Stress for Critical Locations Location Load Step I Pressure I Pressure I Pm [ksi] at I [psi a] Ratio [ ]psia Pm [ksi] -Path5 (inside) --Path? (inside) --Path 7 A (inside) --PathS (inside) --PathS (outside)

--Path SA (inside) --Path 1 0 (inside) --Path10 -(outside)

--Table 10-6 Allowable Ranges of Thermal Stresses SJ Sm 1 1.5Sm Sy1 Pm Allowable Path Range [ksi] [ksi] [ksi] [ksi] X y' SIRange _ [ksi] [ksi] _ Path5 (Inside) -Path? (Inside) -Path7a (Inside) -PathS (Inside) I -PathS (Outside)

-PathSa (Inside) -Path10 (Inside) -Path10 (Outside)

Where: x =maximum general membrane stress due to pressure ("Pm") divided by the max(Sy , 1.5*Sm). y' = 1/ x for 0 < x < 0.5 and y' = 4(1-x) for 0 s x s 0.5 Allowable SI Range = y'

  • Inax(l.5Sm , S Y) 1 Sm and Sy from Section 5.1 are conseiVatively taken at 680°F. Page 81

. Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary The maximum SI Ranges of thermal stresses are less than the allowable stresses; therefore the requiren1ent has been met. 5) Temperature Limits (NB-3228.5(e))

The maximum temperature of the components 680°F which does not exceed the maximum allowable temperatures listed in Table NB-3228.5(b)-l, Reference

[14]. Therefore, the ASME Code requirement is n1et 6) Minimum Strength Ratio (NB-3228.5(1))

The material shall have specified minimum yield strength to specified minimum tensile strength ratio of less then 0.80. The Sy and Su values at 70°F are listed in Section 5.1 _ Table 10-7 Minimum Strength Ratio Location Material Minimum Sy Minimum Su Sy/Su at 70°F [ksi] at 70°F [ksi] Path5 inside, Path7 inside SA-1S2, F316L 25 65 0.3S Path7A inside PathS inside SA-213, TP304 30 75 0.40 PathSA outside Path 10 inside SA-376, TP316 30 75 0.40 Path 1 0 outside PathS outside Alloy 690 35 85 0.41 All materials above have specified minin1um yield strength to specified minimum tensile strength ratio less then 0.80, therefore the ASME Code requirement is met. 1 0.2.6 Fatigue Usage Factor Calculation For consideration of fatigue usage, the Peak Stress Intensity Ranges are. calculated.

These values n1ust include the total localized stresses.

The fatigue usage factor at a location is usually. calculated based on the actual stress intensity range. However, at a geometric or material discontinuity, an unrealistic peak stress may result from the modeling approach, ele1nent type and mesh sizes. The total stress obtained from the fmite element analysis may not be able to capture the actual stress condition.

To account for the possible modeling inaccuracies, an FSRF is usually applied to the M+B stress intensity range for location experiencing the geometric discontinuity.

The following pages contain the calculation of the cumulative fatigue usage factor for the limiting points. The calculation is performed for all materials (except the head material, since the head is not affected by the WOL). The critical locations are listed in Table 10-8. These locations envelop the remaining paths. Page 82 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary The stress category used in fatigue evaluation, along with an appropriate FSRF, for each node is listed in Table 10-8. Due to the geometric discontinuities at the outside nodes of Path2 , 10 and inside node of Path4A, M+B stress intensities are used with FSRF for fatigue evaluation.

A conservative FSRF o( )s chosen based on Reference

[17], page 395. Table 10-8 Stress Category and FSRF in Fatigue Evaluation r----Location Material Stress Category FSRF Path2 outside node SA-508 M+B -Path4A inside node Alloy 600 M+B -Path7 inside node SA-182 Total -Path8A inside node SA-213 Total -Path9B outside node Alloy 690 Total -Path1 0 outside node SA-376 M+B -----The load 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 may be reduced accordingly.

All transient combinations with SI Ranges contributing to the fatigue usage factor are included in the following tables. Fatigue curves in the following calculation are defined in Figures I-9.2.1 and I-9.2.2 of Reference

[14] for WOL material and Figures N-415(A) and N-415(B) of Reference

[6] and [7] for existing materials as specified in Reference

[ 1]. The Inadvertent Auxiliary Spray transient consists of two cycles (see Figure 8-18); therefore, for the fatigue calculations the transient is splitted into two separate transients "IA1" and "IA2" with the same number of cycles of 12. Transient "IA1" is between time-point 0.0001 [hr] (load step 284) and time-point 1.5417 [hr] (load step 297). Transient "IA2" is between time-point 2.01342 [hr] (load step 298) and time-point 3.00 [hr] (load step 309).

  • The stress intensities due to external loads, as calculated in Section 6.1.2 , are added to the transients SI Ranges where applicable.

As already discussed in Section 1 0.2.2 , the maximum SI due to external loads are given by the load combination:

OBE+Thermal Loads. Therefore, the stress intensity due to this combination is conservatively added to the n1aximum SI Ranges for the first 400 cycles (20x20 cycles is specified for OBE and 250 cycles for thennal external loads), unless otherwise noted. The notes below the tables with fatigue usage calculations provide detailed description of the used stresses and cycles of the external loads. The SI Ranges used for the fatigue calculation are documented in the file "min_paths(M+B).txt" for membrane + bending stresses and in the file "min _paths (Total). txf' for total stresses.

Page 83 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 10-9 Nozzle Usage Factor EVALUATION TITLE: Diablo Canyon, Path2 outside

REFERENCE:

min_paths(M+B).txt MATERIAL:

SA-508, Class 2 TYPE: C, 1/2Mo, Cr, Ni UTS (ksi) = : ] atT! l E curve (psi) f ] Emat (psi)= atT E ratio = Ecurve/Emat RANGE TRANSIENTS REQ'D PEAKS! (Eratio) x ALLOWABLE USAGE WITH RANGE Emat Salt FACTOR NUM. EXTREMES CYCLES RANGE Salt CYCLES 'N' 'U' Total Fatigue Usage Factor= L The Peak Sl Range = 'M+B' x Fatigue Strength Reduction Factor (FSRF) x Ke Factor ----For Range 1. 'M+B' Sl Range= ksi FSRF= Ke= For Range 2. 'M+B' Sl Range= ksi FSRF= Ke= For Range 3, 'M+B' Sl Range = ksi FSRF= Ke = For Range 4, 'M+B' Sl Range = ksi FSRF= Ke= For Range 5, 'M+B' Sl Range = ksi FSRF= Ke= For Range 6. 'M+B' SJ Range= ksi FSRF= Ke= For Range 7, 'M+B' Sl Range= ksi FSRF= Ke= For Range 8, 'M+B' Sl Range = ksi FSRF= Ke = For Range 9, 'M+B' Sl Range =

  • ksi FSRF = Ke= For Range 10, 'M+B' Sl Range= ksi FSRF= Ke= For Range 11. 'M+B' Sl Range = ksi FSRF= Ke= For Range 12. 'M+B' Sl RanQe = ksi FSRF= Ke= ---Usa e 1. 0. Therefore the AS:tvffi Code re uirement is met. -g =( q 1 The maximum temperature occuning during the plant operation i( is conservatively used. ]rhe Young's modulus 'Emat' 2 Internal cycles --3 SI o{ }iue to external loads (OBE+Th) is conservatively added to the highest SI Ranges for the first eight combinations, which consis{ ]cycles. ] Page 84 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 10-10 DM Weld Usage Factor EVALUATION TITLE: Diablo Canyon, Path4A inside

REFERENCE:

min_paths(M+B

). txt MATERIAL:

Alloy 600 TYPE: SB166 (Ni-Cr-Fe) UTS (ksi) = I ]

J E curve (psi) { ] Emat (psi)= ] atT E ratio = Ecurve/Emat RANGE TRANSIENTS REQ'D PEAKSI (Eratio) x ALLOWABLE USAGE WITH RANGE E mat Salt FACTOR NUM. EXTREMES CYCLES RANGE Salt CYCLES 'N' *u* --------Total Fatigue Usage Factor= [ ] The Peak Sl Range= 'M+B' x Fatigue Strength Reduction Factor (FSRF) x Ke Factor ------For Range 1, 'M+B' Sl Range= ksi FSRF= Ke= For Range 2, 'M+B' Sl Range = ksi FSRF = Ke= For Range 3, 'M+B' Sl Range = ksi FSRF= Ke= For Range 4. 'M+B' Sl Range = ksi FSRF= Ke= For Range 5, 'M+B' Sl Range = ksi FSRF = Ke= For Range 6, 'M+B' Sl Range = ksi FSRF= Ke= For Range 7, 'M+B' Sl Range= ksl FSRF= Ke= For Range 8, 'M+B' Sl Range = ksi FSRF= Ke= For Range 9, 'M+B' Sl Range = ksi FSRF= Ke= ........ ---Usage =f }: 1.0. Therefore , the ASME Code requirement is met 1 The maximum temperature occurring dming the plant operation i{ is conseiVatively used. . ] The Young's modulus 'Emat' a{ ] 2 Internal cycles 3 The external loads do not act during the spray actuations.

4 Sl o( )iue to external loads (OBE+Th) is conseiVatively added to the highest Sl Ranges for the first six maximum combinations , which consis{ )cycles. Page 85 Controlled Document A. AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 10-11 Safe End Usage Factor EVALUATION TITLE: Diablo Canyon, Path7 inside

REFERENCE:

min _paths(Total

). txt MATERIAL:

SA-182 TYPE: F316L (17Cr-12Ni-2Mo)

UTS (ksi) = I J l E curve (psi) { ] Emat (psi)= E ratio = Ecurve/Emat TRANSIENTS USAGE RANGE REQ'D PEAKSI (Eratio) x ALLOWABLE WITH RANGE E mat Salt FACTOR NUM. CYCLES RANGE Salt CYCLES 'N' EXTREMES 'U' Total Fatigue Usage Factor= [ ] The Peak Sl Range= 'Total' x Fatigue Strength Reduction Factor (FSRF) x Ke Factor --For Range 1, 'Total' Sl Range = ksl FSRF = Ke = For Range 2, 'Total' Sl Range = ksi FSRF = Ke = For Range 3, 'Total' Sl Range = ksl FSRF= Ke = For Range 4, 'Total' Sl Range = ksi FSRF= Ke = For Range 5, 'Total' Sl Range = ksi FSRF Ke = For Range 6 , 'Total' Sl Range = ksi FSRF Ke G= For Range 7 , 'Total' Sl Range= ksl FSRF KeG= For Range 8, 'Total' Sl Range = ksi FSRF= Ke 6 = ... ----------Usage f }: 1.0. Therefore , the ASME Code requiretnent is n1et. 1 The maximum temperature occurring during the plant operation i[ is consetvatively used. ]rhe Young's modulus 'Emat' a[ 2 Internal Cycles 3 The external loads do not act during the spray actuations.

4 The Yotmg's modulus 'Emat' is taken at average metal temperature for this combination (s ee Table 10-12). 5 SI o( Jlue to external loads (OBE+Th) is conservatively added to the highest SI Ranges for t he first four combmations , which consis{

6 Sm value for Ke factor calculation is taken a t average temperature for this calculation (see Table 10-12). ] Page 86 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 10-12 E and Sm at Average Temperature for Table 10-11 Fatigue Evaluation Combination Load Step T [°F] Tavg [oF Sm at Tavg Emat at [oF) Tavg [psi] Page 87 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary RANGE NUM.

REFERENCE:

MATERIAL:

TYPE:

  • UTS (ksi) = Emat (psi)= TRANSIENTS WITH RANGE EXTREMES Table 10-13 Safe End to Pipe Weld Usage Factor EVALUATION TITLE: Diablo Canyon, PathSA inside min_paths(Total).txt SA-213 TP316 (16Cr-13Ni-3Mo)

I 1 . :: t __ J REQ'D CYCLES PEAKSI RANGE E mat Salt E curve (psi) {

  • E ratio = Ecurve/Emat (Eratio) x Salt ALLOWABLE CYCLES 'N' ] USAGE FACTOR *u* Total Fatigue Usage Factor=[ ] The Peak Sl Range= Total' x Fatigue Strength Reduction Factor (FSRF) x Ke Factor -For Range 1, 'Total' Sl Range = ksi For Range 2, 'Total' Sl Range = ksi For Range 3, 'Total' Sl Range = ksi For Range 4, 'Total' Sl Range = ksi For Range 5, 'Total' Sl Range = ksl For Range 6, 'Total' Sl Range = ksl For Range 7, 'Total' Sl Range= ksi --FSRF F FSRFi= FSRF = FSRF = FSRF = FSRF = FSRF --Ke5 Ke 5 Ke 5 Ke Ke 5 Ke Ke --Usage i ]< 1.0. Therefore , the ASME Code requirement is met. 1 The maximum temperature occuning dming the plant operation i{ is conse1vatively used. 2 Internal cycles 3 The extemalloads do not act dming the spray actuations.

Jrhe Young's modulus 'Emat' a[ 4 SI o[ )lue to extemalloads (OBE+ Th) is conservatively added for the first fom maximum ranges , which consisl Jycles. . 5 Ke factor using Sm i ] ] Page 88 Controlled Document A AREVA Document No. 32-9219781-002

-* -* Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary Table 10-14 Weld Overlay Usage Factor EVALUATION TITLE: Diablo Canyon, Path9B outside

REFERENCE:

min_paths(Total).txt MATERIAL:

Alloy690 TYPE: SB-166 (Ni-Cr-Fe)

UTS {ksi) = 1: ] 1 atTt J E curve (psi) =( ] Emat (psi)= atT E ratio = Ecurve/Emat TRANSIENTS REQ'D USAGE RANGE PEAKSI (Eratio) x ALLOWABLE WITH RANGE CYCLES Emat salt FACTOR NUM. RANGE Salt CYCLES 'N' EXTREMES 40 years *u* Total Fatigue Usage Factor= 1 The Peak Sl Range= 'Total' x Fatigue Strength Reduction Factor (FSRF) x Ke Factor ,....... ---,.....--For Range 1, 'Total' Sl Range = ksi FSRF Ke = For Range 2, 'Total' Sl Range = ksl FSRF Ke = For Range 3, 'Total' Sl Range = ksi FSRF Ke = For Range 4, 'Total' Sl Range = ksi FSRF Ke = For Range 5, 'Total' Sl Range = ksi FSRF Ke = For Range 6, 'Total' Sl Range = ksi FSRF Ke For Range 7. 'Total' Sl Range = ksl FSRF Ke = For Range 8, 'Total' Sl Range = ksl FSRF Ke = For Range 9, 'Total' Sl Range = ksl FSRF Ke For Range 10, 'Total' Sl Range= ksi FSRF Ke = ------Usage=( ): 1.0. Therefore, the ASl\ffi Code requirement is met. 1 The maximum temperature occurring dming the plant operation i{ is conservatively used. 2 Internal cycles 3 The external loads do not act dming the spray actuations. ]The Young's modulus 'Emat' a( 4 SI o{ }tue to external loads (OBE+ Th) is conservatively added to the maximum SI Ranges for first six combinations, which consist fron{ ] cycles. J ] Page 89 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary RANGE NUM. Table 10-15 Pipe Usage Factor EVALUATION TITLE: Diablo Canyon, Path10 outside

REFERENCE:

MATERIAL:

TYPE: UTS (ksi) = Em at. (psi)= TRANSIENTS WITH RANGE EXTREMES min_paths(M+B).txt SA-376 ( TP316 TCr-13Ni-3Mo) f REQ'D CYCLES PEAK Sl RANGE E mat Salt E curve (psi) f E ratio = Ecurve/Emat (Eratio) x Salt ALLOWABLE CYCLES'N' Total Fatigue Usage Factor =1. The Peak Sl Range = 'M+B' x Fatigue Strength Reduction Factor (FSRF) x Ke Factor ----For Range 1, 'M+B' Sl Range = ksi FSRF Ke 5 = For Range 2, 'M+B' Sl Range = ksi FSRF Ke 5 = For Range 3, 'M+B' Sl Range = ksi FSRF Ke 5 = For Range 4, 'M+B' Sl Range = ksi FSRF Ke = For Range 5, 'M+B' Sl Range = ksl FSRF Ke = For Range 6, 'M+B' Sl Range= ksi FSRF Ke = For Range 7, 'M+B' Sl Range= ksi FSRF Ke = For Range 8, 'M+B' Sl Range = ksi FSRF Ke= For Range 9, 'M+B' Sl Range = ksl FSRF Ke= For Range 1 o. 'M+B' Sl Range = ksl FSRF Ke = For Range 11. 'M+B' Sl Range = ..............

ksl FSRF Ke = Usage=[ ]< 1.0. Therefore, the ASME Code requirement is n1et. ] USAGE FACTOR 'U' --1 The maximum temperature occuning during the plant operation i( is conservatively used. ]The Young's modulus *Emat' a( ] 2 Intemal cycles. 3 The external loads do not act during the spray achiations.

4 SI o( }ue to extemalloads (OBE+Th) is consetvatively added in firs( ] 5 Ke factor using Sm { ] Page 90 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 11 RESULTS

SUMMARY

/CONSLUSION Stress analyses of the spray nozzle weld overlay repairs for Diablo Canyon Unit 2 Pressurizer are summarized in this report. Minimum overlay configuration is investigated.

The analyses demonstrate that the weld overlay designs satisfy the stress and fatigue requirements of the ASI\ffi Code (Reference

[14]). The summary of the maximum primary+secondary membrane plus bending stress intensity ranges and fatigue usage factor are listed in Table 11-1 for each component.

The cumulative fatigue usage factors at critical locations investigated are less than 1.0, with the highest usage factor being[ _ _ _ _ _ _]The fatigue evaluation is based on the spray nozzle design transient, and for the specified number of cycles per Reference

[2]. In conclusion, the spray nozzle with weld overlay satisfies the ASI\ffi Code pri1nary plus secondary stress requirements as well as criteria against the fatigue failure. The primary stress criteria are satisfied as described in Section 10.1 . Table 11-1 Summary of Results Max. 51 Range PL+Pb+Q Fatigue Usage Factor Component Material Primary 51 Calculated Limit Calculated Limit [ksi] [ksi] IR [ksi] [ksi]

IR Nozzle SA-508 f-f--OM Weld Alloy 600 f-f--Safe End SA-182 See Section f-f--Safe End to SA-213 10.1 Pipe Weld f-f--Pipe SA-376 r-r-Weld Alloy 690 Overlay Page 91 Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 12 SOFTWARE VERIFICATION The finite element analyses documented in this report were performed using ANSYS vll.O software (Reference

[13]). The suitability and accuracy of use of ANSYS v11.0 was verified by performing the following verification runs. Table 12-1 ANSYS Verification Files File Name Date Element Type VM211.0UT 5/31/2007 PLANE183 2-D 8-Node Structural Solid VM112.0UT 5/31/2007 PLANE77 2-D 8-Node Thermal Solid VM211.0UT 5/31/2007 CONTA172 2-D 3-Node Surface-to-Surface Contact VM211.0UT 5/31/2007 TARGE169 2-D Target Segment The Stress Intensity Range calculations , docun1ented in this report , are performed using Stress Range 'v2.0 program. The suitability and accuracy of the StressRange v2.0 are verified by comparing the calculated SI ranges listed in the files "SRange _verif_(M+B).txt" and "SRange _verif_(Total).txt" with Tables L3 and L4 in Reference

[15]. Table 12-2 StressRange Program v2.0 Verification Files File Name Date Description SRange _ verif_{M+B).txt 6/05/2007 StressRange Program verification file for M+B Sl ranges including ZSS SRange_verif_(Total).txt 6/05/2007 StressRange Program verification file for Total Sl ranges including ZSS Page 92 Controlled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2-Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary 13 COMPUTER OUTPUT FILES Table 13-1 Computer Output and Input Files File Name Date Description min geo.mac 5/29/2007 Input file to develop geometry of the spray nozzle min geo.out 5/29/2007 Output file to develop geometry of the spray nozzle min_dT.mac 5/18/2007 Input file defining nodes for temperature and thermal gradient evaluation Output file contains path definition for stress component and min _paths. out 5/30/2007 contains the linearized stresses along the paths for all transients Output file for thermal ratchet analysis contains path definition min_paths_rtch.out 5/30/2007 for stress component and contains the linearized stresses along the paths for all transients Fatigue Stress Range min_paths(M+B

). txt 5/30/2007 Sl Ranges (M+B) for combination of all transients min_paths(Total).txt 5/30/2007 Sl Ranges (Total) for combination of all transients min_paths(M+B-ThBend).txt 5/30/2007 Sl Ranges (M+B) excluding thermal bending for combination of all transients min_paths_rtch(M+B).txt 5/30/2007 Sl Ranges (M+B) with pressure=

0 for combination of all transients Design Condition min DC.out 5/29/2007 Output file for stress analysis min DC _paths.out 5/30/2007 Output file contains stress components along the paths Heat-up Transients HU-ES_tr.inp 5/17/2007 Input file contains definition of heat-up early spray transient min_HU-ES_th.out 5/29/2007 Output file for thermal analysis min_HU-ES_dt.out 5/29/2007 Output file contains thermal gradients min HU-ES stout 5/29/2007 Output file for the stress analysis min HU-ES rtch.out 5/29/2007 Output file for the thermal ratcheting calculation HU-LS tr.inp 5/17/2007 Input file contains definition of heat-up late spray transient min HU-LS th.out 5/29/2007 Output file for thermal analysis min HU-LS dt.out 5/29/2007 Output file contains thermal gradients min HU-LS stout 5/29/2007 Output file for the stress analysis min HU-LS rtch.out 5/29/2007 Output file for the thermal ratcheting calculation Cool-down Transients CD-ES320 _ tr.inp 5/17/2007 Input file contains definition of cool-down early spray transient with drop in a temperature of 320°F min CD-ES320 th.out 5/29/2007 Output file for thermal analysis Page 93 Cant oiled Document A AREVA Document No. 32-9219781-002 Diablo Canyon Unit 2 -Pressurizer Spray Nozzle Weld Overlay Structural Analysis-Non Proprietary min CD-ES320 dtout 5/29/2007 Output file contains thermal gradients --min CD-ES320 stout 5/29/2007 Output file for the stress analysis min CD-ES320 rtch.out 5/29/2007 Output file for the thermal ratcheting calculation CD-LS320_tr.inp 5/17/2007 Input file contains definition of cool-down late spray transient with drop in a temperature of 320°F min CD-ES320 th.out 5/29/2007 Output file for thermal analysis min CD-ES320 dtout 5/29/2007 Output file contains thermal gradients min CD-ES320 stout 5/29/2007 Output file for the stress analysis min CD-ES320 rtch.out 5/29/2007 Output file for the thermal ratcheting calculation CD-ES405 _ tr.inp 5/17/2007 Input file contains definition of cool-down early spray transient with drop in a temperature of 405°F min CD-ES405 th.out 5/29/2007 Output file for thermal analysis min CD-ES405 dtout 5/29/2007 Output file contains thermal gradients min CD-ES405 stout 5/29/2007 Output file for the stress analysis min CD-ES405 rtch.out 5/29/2007 Output file for the thermal ratcheting calculation CD-LS405_tr.inp 5/17/2007 Input file contains definition of cool-down late spray transient with drop in a temperature of 405°F min CD-LS405 th.out 5/29/2007 Output file for thermal analysis min CD-LS405 dtout 5/29/2007 Output file contains thermal gradients min CD-LS405 stout 5/29/2007 Output file for the stress analysis min CD-LS405 rtch.out 5/29/2007 Output file for the thermal ratcheting calculation Plant Loading & Plant Unloading Transient PLPU_tr.inp 5/17/2007 Input file contains definition of plant loading and unloading transient min PLPU th.out 5/29/2007 Output file for thermal analysis min PLPU dtout 5/29/2007 Output file contains thermal gradients min PLPU stout 5/29/2007 Output file for the stress analysis min PLPU rtch.out 5/29/2007 Output file for the thermal ratcheting calculation Step Load Decrease Transient SLD_tr.inp 5/17/2007 Input file contains definition of 10% step load decrease transient min SLD th.out 5/29/2007 Output file for thermal analysis min SLD dtout 5/29/2007 Output file contains thermal gradients min SLD stout 5/29/2007 Output file for the stress analysis min SLD rtch.out 5/29/2007 Output file for the thermal ratcheting calculation Step Load Increase Transient SLI_tr.inp 5/17/2007 Input file contains definition of 10% step load increase transient min SLI th.out 5/29/2007 Output file for thermal analysis min SLI dtout 5/29/2007 Output file contains thermal gradients min SLI stout 5/29/2007 Output file for the stress analysis min SLI rtch.out 5/29/2007 Output file for the thermal ratcheting calculation Page 94

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