ML23207A248

License Renewal Pressurizer Surge Line Inspection

ML23207A248
Person / Time
Site:	Palo Verde
Issue date:	07/26/2023
From:	Harbor C Arizona Public Service Co
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
102-08633-CDH/MSC
Download: ML23207A248 (1)

Text

10 CFR 54 Cary D. Harbor Vice President Regulatory & Oversight Palo Verde Nuclear Generating Station P.O. Box 52034 Phoenix, AZ 85072 Mail Station 7602 Tel: 623.393.7953 102-08633-CDH/MSC July 26, 2023 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station Units 1, 2, and 3 Docket Nos. STN 50-528, 50-529, and 50-530 Renewed Operating License Number NPF-41, NPF-51, and NPF-74 License Renewal Pressurizer Surge Line Inspection

Reference:

Safety Evaluation Report Related to the License Renewal of Palo Verde Nuclear Generating Station, Units 1, 2, and 3 published as NUREG-1961, dated April 2011 [Agencywide Documents Access and Management System (ADAMS) Accession Number ML11095A011]

Consistent with the above reference, Arizona Public Service Company (APS) is committed to manage the effects of environmentally assisted fatigue (EAF) of the reactor coolant pressure boundary during the period of extended operation. Specifically, when any monitored location fatigue usage factor including EAF projects to exceed 1.0, corrective actions will be established using one or more of the following approaches:

1. Determine whether the scope of the enhanced Metal Fatigue of Reactor Coolant Pressure Boundary program must be enlarged to include additional affected reactor coolant pressure boundary locations. This determination will ensure that other locations do not approach design limits without an appropriate action.

2. Adjust fatigue monitoring methods to confirm continued conformance to the code limit.

3. Repair/modify the component.

4. Replace the component.

5. Perform a more rigorous analysis of the component to demonstrate that the design code limit will not be exceeded.

6. Modify plant operating practices to reduce the fatigue usage accumulation rate.

7. Perform a flaw tolerance evaluation and impose component-specific inspections, under ASME Section XI Appendices A or C (or their successors) and obtain required approvals from the regulatory agency.

For Palo Verde Nuclear Generating Station (PVNGS) Units 1, 2, and 3, monitored locations on the pressurizer surge line are projected to exceed a cumulative usage fatigue factor of 1.0 when considering the effects of EAF. APS intends to manage the aging effects of EAF on the pressurizer surge line using approach seven described above, namely periodic inspections performed at a frequency determined by a flaw A member of the STARS Alliance, LLC Callaway

• Diablo Canyon

• Palo Verde

• Wolf Creek

102-08633-CDH/MSC ATTN: Document Control Desk U.S. Nuclear Regulatory Commission License Renewal Pressurizer Surge Line Inspection Page 2 tolerance evaluation in accordance with ASME Section XI, Non-Mandatory Appendix L, Operating Plant Fatigue Assessment. Accordingly, the enclosure provides the description of the flaw tolerance evaluation and proposed inspections for NRC Staff review and approval.

A pre-submittal meeting for the pressurizer surge line inspection license renewal submittal was held between APS and the Nuclear Regulatory Commission (NRC) staff on May 25, 2023. Approval of the proposed method to manage aging due to EAF for the pressurizer surge line is requested by July 26, 2024. Once approved, the proposed method to manage aging due to EAF for the pressurizer surge line will be implemented within 120 days.

No new commitments are being made to the NRC by this letter.

Should you need further information regarding this letter, please contact Matthew S.

Cox, Licensing Department Leader, at (623) 393-5753.

Sincerely, Digitally signed by Harbor, Harbor, Cary Cary (Z16762)

Date: 2023.07.26 15:42:19 (Z16762) -07'00' CDH/MSC/cr

Enclosure:

Proposed Method to Manage Environmentally Assisted Fatigue for the Pressurizer Surge Line cc: R. J. Lewis Acting NRC Region IV Regional Administrator S. P. Lingam NRC NRR Project Manager for PVNGS L. N. Merker NRC Senior Resident Inspector for PVNGS B. D. Goretzki Arizona Department of Health Services - Bureau of Radiation Control

ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE

ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE Submittal of Pressurizer Surge Line Inspection Program

1.0 BACKGROUND

2.0 FLAW TOLERANCE EVALUATION DESCRIPTION 3.0 INSPECTION ATTRIBUTES 4.0 IMPLEMENTATION PLAN 5.0 PRECEDENT

6.0 REFERENCES

ATTACHMENT(S): : Structural Integrity Associates Report No. 2000645.402, Flaw Tolerance Evaluation of the Palo Verde Units 1, 2, and 3 Surge Line Piping using ASME Code, Section XI, Appendix L, Revision 0, dated March 2, 2023 Page i

ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE

1.0 BACKGROUND

Arizona Public Service Company (APS) license renewal application for Palo Verde Nuclear Generating Station (PVNGS) Units 1, 2, and 3 (Reference 1) describes the program (X.M1) for managing Metal Fatigue of the Reactor Coolant Pressure Boundary utilizing cycle counting and cumulative usage fatigue (CUF) factor tracking to ensure the actual plant experience remains bounded by design assumptions and calculation, including the effects of environmentally assisted fatigue (EAF), during the period of extended operation (PEO). As described in UFSAR Section 19.2.1, Metal Fatigue of Reactor Coolant Pressure Boundary (Reference 6), when any monitored location usage factor including EAF are projected to exceed 1.0, corrective actions will be established using one or more of the following approaches:

1. Determine whether the scope of the enhanced Metal Fatigue of Reactor Coolant Pressure Boundary program must be enlarged to include additional affected reactor coolant pressure boundary locations. This determination will ensure that other locations do not approach design limits without an appropriate action.

2. Adjust fatigue monitoring methods to confirm continued conformance to the code limit.

3. Repair/modify the component.

4. Replace the component.

5. Perform a more rigorous analysis of the component to demonstrate that the design code limit will not be exceeded.

6. Modify plant operating practices to reduce the fatigue usage accumulation rate.

7. Perform a flaw tolerance evaluation and impose component-specific inspections, under ASME Section XI Appendices A or C (or their successors) and obtain required approvals from the regulatory agency.

As reflected in the Nuclear Regulatory Commission (NRC) Safety Evaluation Report (SER) for PVNGS, Units 1, 2, and 3 License Renewal Application (Reference 2), if an inspection program is proposed as the basis for aging management, the proposed aging management program (AMP) should ensure that (a) inspections will be performed for the specific component(s) or structure(s) in the evaluation, and (b) the inspection methods and frequencies in the proposed inspection program are applicable to the component(s), such that they may be used to demonstrate compliance with the requirement in 10 CFR 54.21(c)(1)(iii), which states:

The effects of aging on the intended function(s) will be adequately managed for the period of extended operation.

For PVNGS Units 1, 2, and 3, monitored locations on the pressurizer surge line are projected to exceed a CUF factor of 1.0 when considering the effects of EAF.

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ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE Consideration of the effects of EAF is required in the PEO. The bounding or sentinel location is the elbow immediately above the hot leg surge nozzle. At this location, the CUF factor considering the effects of EAF will exceed 1.0 upon entry into the PEO. For 60 years of operating cycles, the maximum projected EAF usage is 4.27 for Unit 1 (Reference 3), 4.66 for Unit 2 (Reference 4), and 5.86 for Unit 3 (Reference 5).

APS intends to manage the aging effects of EAF on the pressurizer surge line using approach seven described above, namely periodic inspections performed at a frequency determined by a flaw tolerance evaluation in accordance with ASME Section XI, Non-Mandatory Appendix L, Operating Plant Fatigue Assessment.

Accordingly, Sections 2, 3 and 4 provide a description of the flaw tolerance evaluation, the inspection program, aging management program attributes, and implementation plan for NRC review and approval.

The current licensing basis analyses do not consider the effects of EAF. The pressurizer surge lines were analyzed as ASME Code Class 1 components to ASME Section III requirements. ASME Class 1 components are analyzed for metal fatigue per ASME NB-3600 and associated Code requirements. These analyses consider the design transients described in UFSAR Section 3.9.1.1, Design Transients (Reference 6). The pressurizer surge line analysis includes the effects of thermal stratification as required by NRC Bulletin 88-11, Pressurizer Surge Line Thermal Stratification, by incorporating the results of the Combustion Engineering Owners Group (CEOG) analysis CEN-387-NP, Pressurizer Surge Line Flow Stratification Evaluation, Revision 1-NP-A. This report consists of a generic bounding analysis for CEOG plants including PVNGS.

Design rules specified in NB-3200 were applied in the CEOG analysis. Since the originally specified set of design transients did not include any stratified flow loading conditions, the CEOG analysis developed a revised set of design basis transients based on test data acquired at PVNGS and other CEOG plants. One bounding set of transients were developed that could then be utilized by each CEOG plant. The analysis superimposed specified thermal stratification events for each assumed heatup and cooldown transient. The resulting fatigue analysis demonstrated that cumulative usage factor for locations on the pressurizer surge line was less than the Code limit of 1.0.

NUREG-1800, Standard Review Plan for Review of License Renewal Applications for Nuclear Power Plants, Revision 2 (Reference 7), Section 4.3.1, states:

The effects of fatigue for the initial 40-year reactor license period were studied and resolved under Generic Safety Issue (GSI)-78, Monitoring of Fatigue Transient Limits for Reactor Coolant System and GSI-166, Adequacy of Fatigue Life of Metal Components.

These NRC studies concluded that conservatisms in the original fatigue calculations rendered a backfit of the environment fatigue data to operating plants unjustified.

As such, the current license basis fatigue calculations are not required to address or consider EAF. For the PEO, explicit consideration of EAF is required and is the subject of this ASME Section XI, Non-Mandatory Appendix L, flaw tolerance evaluation specific to PVNGS pressurizer surge lines.

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ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE 2.0 FLAW TOLERANCE EVALUATION DESCRIPTION The proposed pressurizer surge line inspections are based on the flaw tolerance approach described in ASME Section XI, Non-Mandatory Appendix L. Appendix L has been approved by the ASME Code and has been implemented and used successfully for managing fatigue for extended plant operation in several pressurized water reactors (Refer to Section 5.0 of this enclosure).

PVNGS Units 1, 2, and 3 surge line is 12-inch nominal pipe size, schedule 160, ASME SA-376 or SA-312 Grade TP304 pipe and SA-403 Grade WP304 elbows.

A fatigue flaw tolerance evaluation was performed specifically for PVNGS to assess the operability of the pressurizer surge line by using inspections and the ASME Section XI, Appendix L, methodology to determine the successive inspection interval for the pressurizer surge line with a postulated inside diameter (ID) surface-connected reference flaws (Reference 8). From a survey of the stresses, load cycles and calculated crack growth in the pressurizer surge line, the bounding locations were identified and evaluated in detail.

The bounding locations for determining the successive inspection interval are the butt welds on a horizontally oriented elbow approximately mid-length between the pressurizer and the hot leg (welds 30B and 30E in Table 1). From a comparison of geometry, material properties, and applicable loads, the evaluation of the bounding location is also applicable to the other pipe and weld locations on the pressurizer surge line.

A detailed evaluation was also performed for the pressurizer surge line hot leg elbow base metal, which is the EAF sentinel location for the pressurizer surge line.

That evaluation utilizing crack growth and flaw tolerance methodology that take guidance from Section XI, Appendix L and Appendix C, and other industry references, determined that the successive inspection interval is bounded by the pressurizer surge line elbow butt welds, and thus will be performed at the same interval (Reference 8).

The terminal ends of the pressurizer surge line at the pressurizer nozzle and hot leg nozzle do not project to greater than a CUF factor of 1.0 considering EAF and thus are not within the scope of this Appendix L submittal. However, PVNGS already performs periodic examinations of the full structural weld overlays (WOLs) on these nozzles. The successive examination interval of these two (2) WOLs is consistent (i.e., 10 years) with that determined for the pressurizer surge line welds and base metal elbows within this ASME Appendix L submittal.

The results of the crack growth and flaw tolerance evaluations for the weld locations are presented in Table 1 and elbow base metal in Table 2. The technical analysis of the flaw tolerance evaluation is provided in Reference 8.

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ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE Table 1: PVNGS Pressurizer Surge Line Fatigue Crack Growth Results-Welds Semi-Elliptical Axial Flaw 360-Degree Circumferential Flaw Weld Paths Flaw size in 10 ID Flaw size in 10 Years Allowable N, Allowable N, Years a/t years a/t years a, inch c, inch a/t a, inch a/t P1 0.2336 0.5972 0.1781 0.75 100 0.2500 0.1906 0.2523 22 P2 0.2321 0.5963 0.1769 0.75 100 0.2513 0.1915 0.2523 21 20B P3 0.2443 0.6037 0.1862 0.75 100 0.2660 0.2027 0.2523 17 P4 0.2332 0.5966 0.1778 0.75 100 0.2475 0.1886 0.2523 22 P1 0.2575 0.6158 0.1963 0.75 100 0.2466 0.1879 0.3155 34 P2 0.2324 0.5978 0.1772 0.75 100 0.2702 0.2059 0.3155 24 20E P3 0.2537 0.6128 0.1934 0.75 100 0.3173 0.2418 0.3155 15 P4 0.2603 0.6183 0.1984 0.75 100 0.3296 0.2512 0.3155 14 P1 0.2302 0.5953 0.1755 0.75 100 0.2505 0.1909 0.4282 52 P2 0.2304 0.5954 0.1756 0.75 100 0.2474 0.1885 0.4282 57 27 P3 0.2274 0.5930 0.1733 0.75 100 0.2474 0.1885 0.4282 57 P4 0.2316 0.5962 0.1765 0.75 100 0.2833 0.2159 0.4282 29 P1 0.2635 0.6213 0.2008 0.75 99 0.2487 0.1896 0.3117 32 P2 0.2455 0.6068 0.1871 0.75 100 0.2474 0.1886 0.3117 34 30B P3 0.2447 0.6057 0.1865 0.75 100 0.2474 0.1886 0.3117 34 P4 0.2469 0.6074 0.1882 0.75 100 0.3236 0.2466 0.3117 14 P1 0.2623 0.6203 0.1999 0.75 100 0.2485 0.1894 0.2957 29 P2 0.2456 0.6068 0.1872 0.75 100 0.2661 0.2028 0.2957 23 30E P3 0.2471 0.6076 0.1883 0.75 100 0.3191 0.2432 0.2957 13 P4 0.2490 0.6091 0.1898 0.75 100 0.3206 0.2444 0.2957 13 P1 0.2389 0.6009 0.1821 0.75 100 0.2464 0.1878 0.4238 56 P2 0.2357 0.5994 0.1796 0.75 100 0.2537 0.1934 0.4238 49 50B P3 0.2511 0.6102 0.1914 0.75 100 0.2487 0.1896 0.4238 52 P4 0.2471 0.6074 0.1884 0.75 100 0.2978 0.2270 0.4238 25 P1 0.2437 0.6042 0.1858 0.75 100 0.2468 0.1881 0.4314 57 P2 0.2358 0.5994 0.1797 0.75 100 0.2474 0.1886 0.4314 57 50E P3 0.2517 0.6107 0.1918 0.75 100 0.2482 0.1891 0.4314 55 P4 0.2469 0.6073 0.1882 0.75 100 0.2999 0.2286 0.4314 25 P1 0.2415 0.6029 0.1841 0.75 100 0.2539 0.1935 0.4512 51 P2 0.2373 0.6000 0.1808 0.75 100 0.2522 0.1922 0.4512 55 60B P3 0.2385 0.6009 0.1818 0.75 100 0.2488 0.1896 0.4512 60 P4 0.2304 0.5949 0.1756 0.75 100 0.2808 0.2141 0.4512 30 P1 0.2317 0.5964 0.1766 0.75 100 0.2543 0.1938 0.4207 47 P2 0.2315 0.5959 0.1764 0.75 100 0.2609 0.1989 0.4207 38 60E P3 0.2453 0.6052 0.1870 0.75 100 0.2504 0.1909 0.4207 51 P4 0.2406 0.6022 0.1834 0.75 100 0.2584 0.1969 0.4207 40 Notes for Table 1:

1. The postulated initial axial flaw depth is determined from Table IWB-3410-1 using a flaw aspect ratio of 0.167 and a component thickness of 1.312 inches, resulting is an initial flaw depth of 0.1885 inches and flaw length of 1.131.

2. The postulated initial circumferential flaw depth is 0.1885 inches with a 360-degree circumferential extent.

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ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE

3. The allowable flaw a/t from ASME Section XI, Appendix C, Table C-5310-5 for circumferential flaws and Table C-5410-1 for axial flaws.

4. Per Appendix L, if the allowable operating period is equal to or greater than 10 years, the successive inspection schedule shall be equal to the examination interval listed in the PVNGS ASME Section XI Schedule of Inservice Inspection (ISI) program, or 10 years.

Table 2: PVNGS Pressurizer Surge Line Fatigue Crack Growth Results-Elbow Base Metal Semi-Elliptical Axial Flaw (Flank)

Location Flaw size in 10 years Allowable N, (Elbow Flank) a, inch C, inch a/t a/t years Elbow 60 0.3520 0.7192 0.2683 0.75 50 Elbow 30 0.2982 0.6548 0.2273 0.74 72 Notes for Table 2:

1. The postulated initial axial flaw depth is determined from Table IWB-3410-1 using a flaw aspect ratio of 0.167 and a component thickness of 1.312 inches, resulting is an initial flaw depth of 0.1885 inches and flaw length of 1.131.

2. Allowable flaw sizes: depth-to-thickness ratio (a/t) from ASME Section XI, Appendix C, Table C-5410-1.

3. Inspection interval of pressurizer surge line elbow base metal will be the same as the inspection schedule for the Table 1 welds (i.e., 10 years).

3.0 INSPECTION ATTRIBUTES The attributes of the pressurizer surge line inspection program, consistent with the attributes delineated in NUREG-1800, Revision 2 (Reference 7), are discussed below:

1. Scope of the Program The pressurizer surge line welds listed in Table 3 will be examined in accordance with ASME Section XI, and will use acceptance criteria of Section XI, IWB for Class 1 welds. In addition, the elbow base metal for the pressurizer surge line elbows will be examined in accordance with ASME Code, Section XI procedures capable of detecting thermal fatigue with acceptance criteria from ASME Section III, NB-2500. The aging effect managed with these inspections is cracking due to EAF. Figure 1 provides the location of the pressurizer surge line welds and elbows.

Table 3: PVNGS Pressurizer Surge Line-Inspection Summary Weld/Elbow Last Examination Performed & Allowable Operating Proposed No. Results Period per ASME Inspections Appendix L Analysis Type/Frequency (Note 1) 20B U1-Ultrasonic (UT) Spring 2022 (1R23) Greater than 10 years Volumetric U2-UT Spring 2023 (2R24) Once in 10 years U3-UT Fall 2022 (3R23)

Inspections identified no detectable flaws 20E U1-UT Spring 2022 (1R23) Greater than 10 years Volumetric U2-UT Spring 2023 (2R24) Once in 10 years U3-UT Fall 2022 (3R23)

Inspections identified no detectable flaws 27 U1-UT Spring 2022 (1R23) Greater than 10 years Volumetric U2-UT Spring 2023 (2R24) Once in 10 years U3-UT Fall 2022 (3R23)

Inspections identified no detectable flaws 30B U1-UT Spring 2022 (1R23) Greater than 10 years Volumetric U2-UT Spring 2023 (2R24) Once in 10 years U3-UT Fall 2022 (3R23)

Inspections identified no detectable flaws Page 5

ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE Table 3: PVNGS Pressurizer Surge Line-Inspection Summary Weld/Elbow Last Examination Performed & Allowable Operating Proposed No. Results Period per ASME Inspections Appendix L Analysis Type/Frequency (Note 1) 30E U1-UT Spring 2022 (1R23) Greater than 10 years Volumetric U2-UT Spring 2023 (2R24) Once in 10 years U3-UT Fall 2022 (3R23)

Inspections identified no detectable flaws 50B U1-UT Spring 2022 (1R23) Greater than 10 years Volumetric U2-UT Spring 2023 (2R24) Once in 10 years U3-UT Fall 2022 (3R23)

Inspections identified no detectable flaws 50E U1-UT Spring 2022 (1R23) Greater than 10 years Volumetric U2-UT Spring 2023 (2R24) Once in 10 years U3-UT Fall 2022 (3R23)

Inspections identified no detectable flaws 60B U1-UT Spring 2022 (1R23) Greater than 10 years Volumetric U2-UT Spring 2023 (2R24) Once in 10 years U3-UT Fall 2022 (3R23)

Inspections identified no detectable flaws 60E U1-UT Spring 2022 (1R23) Greater than 10 years Volumetric U2-UT Spring 2023 (2R24) Once in 10 years U3-UT Fall 2022 (3R23)

Inspections identified no detectable flaws Surge line U1-UT Spring 2022 (1R23) Greater than 10 years Volumetric elbow (Elbow U2-UT Spring 2023 (2R24) (Note 2) Once in 10 years

60) U3-UT Fall 2022 (3R23) (Note 2)

Inspections identified no detectable flaws Surge line U2-UT Spring 2023 (2R24) Greater than 10 years Volumetric elbow (Elbow Inspections identified no detectable flaws (Note 2) Once in 10 years

30) (Note 2)

Notes for Table 3:

1. The inspection frequency as determined by ASME Code Section XI, Appendix L, analysis is more than 10 years. In accordance with the requirements of Appendix L Table-3420-1, the pressurizer surge line welds will be examined at a 10 year interval.

2. The inspection frequency for the pressurizer surge line elbow base metal as determined by equivalent or similar to ASME Code Section XI, Appendix L, methodology is more than 10 years.

Pressurizer surge line elbows will have base metal examinations performed at the same interval/frequency as the pressurizer surge line welds.

Figure 1: Monitored Pressurizer Surge Line Welds and Elbows Page 6

ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE During the PEO, examinations of the pressurizer surge line piping welds and the base metal of the pressurizer surge line elbows base metal will be performed at a ten-year inspection interval in accordance with the PVNGS Inservice Inspection (ISI) Program. The pressurizer surge line welds have been examined in PVNGS Units 1, 2, and 3, and were absent of flaws larger than the applicable ASME acceptance standards, as required for applicability of ASME Section XI, Appendix L. Additionally, the sentinel elbow base metal component have been examined in PVNGS Units 1, 2, and 3, and were absent of flaws larger than the applicable ASME, Section III, acceptance standards, which supports the use of guidance from ASME Section XI, Appendix L.

Examinations results are evaluated by qualified individuals in accordance with ASME Section XI and Section III, as applicable, acceptance criteria. Components with indications that meet these acceptance criteria are considered acceptable for continued service.

2. Preventive Actions There are no specific preventive actions under these inspections to prevent the effects of aging.

3. Parameter(s) Monitored or Inspected Future ISI examinations for the pressure surge line elbow welds and pressurizer surge line elbow base metal are planned to be volumetric examinations at the frequency of 10 years.

4. Detection of Aging Effects The degradation of the monitored pressurizer surge line components is determined by volumetric examinations in accordance with the requirements of the PVNGS ISI program. The frequency and scope of examinations are sufficient to ensure that the aging fatigue effects are detected before the integrity of the pressurizer surge line would be compromised.

The pressurizer surge line is subject to a thermal degradation per the site N-716-1, Alternative Classification and Examination Requirements, Section XI, Division 1, risk informed program documented in MN756-A00031, Palo Verde ASME Code Case N-716-1 Program Updated (2022), and the ISI program manuals, 4INT-ISI-1,2,3, 4th Inspection Interval Inservice Inspection Program Summary Manual - PVGS Unit 1, 2, and 3. Examinations are conducted using performance demonstration initiative procedure for austenitic material and MRP-36 trained examiners. Examination volume of the welds include extended exam volumes as addressed in MRP-36 and base metal exams used scanning techniques consistent with MRP-36 training.

In preparation for the initial pressurizer surge line thermal fatigue examinations, flawed samples were used to train examiners for detection of thermal fatigue. In addition to scanning flawed samples, examiners who had previous MRP-36 training reviewed the training material along with any newly trained MRP-36 examiners.

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ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE

5. Monitoring and Trending The frequency and scope of the examinations are sufficient to ensure that the EAF effects are detected before the intended function of the pressurizer surge line is compromised. Volumetric examinations will be performed in accordance with the inspection intervals based on the results of the postulated flaw tolerance evaluations performed in accordance with or based on guidance from the ASME Section XI, Appendix L, methodology.

Flaws identified in the pressurizer surge line components will be evaluated by engineering to assess the effect of EAF and determine impacts on the EAF analysis. Records of the examination procedures, results of activities, examination databases, and corrective actions taken or recommended will be maintained in accordance with the requirements of PVNGS ISI Program and ASME Section XI.

6. Acceptance Criteria Acceptance standards for the ISI examinations of the pressurizer surge line welds are identified in Section XI, Subsection IWB for Class 1 components. Table IWB-3410 identifies the acceptance standards listed in IWB-3500. Acceptance standards for pressurizer surge line elbow base metal are identified in Section III, NB-2500. Flaws found in the pressurizer surge line components that are revealed by the volumetric examinations require additional flaw evaluation per the requirements of ASME Section XI or replacement.

Flaws that exceed the acceptance criteria will be entered into the PVNGS corrective action program. Acceptance for continued service with flaws that do not meet the applicable acceptance standards will be corrected by repair, replacement or analytical flaw evaluation performed in accordance with or guidance from ASME Section XI, Appendices A or C, and other industry references as applicable.

Repairs or replacements will be performed in accordance with ASME Section XI, Subsection IWA-4000, as described in PVNGS procedure, Repair/Replacement-ASME Section XI.

7. Corrective Actions Condition Reports are generated in accordance with the PVNGS corrective action program for flaws that exceed the acceptance criteria. Components with examination results that do not meet applicable acceptance criteria are subject to acceptance by analytical flaw evaluation and/or acceptance by repair or replacement in accordance with subsection IWA-4000. Evaluation of flaws in elbow base metal will utilize guidance from Section XI, Appendices A and C, and other Industry references as applicable.

8. Confirmation Process When degradation is identified in pressurizer surge line components, an engineering evaluation is performed to determine if the components are Page 8

ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE acceptable for continued service or if repair or replacement is required. The engineering evaluation includes probable causes, the extent of degradation, the nature and frequency of additional examinations, and whether repair or replacement is required.

Repairs or replacements will be performed in accordance with ASME Section XI, Subsection IWA-4000, as described in PVNGS procedure, Repair/Replacement-ASME Section XI.

9. Administrative Controls The PVNGS ISI Program will document the EAF inspection requirements for the PVNGS pressurizer surge lines under the ASME Section XI, ISI Program. Site Quality Assurance procedures, review and approval processes, and administrative controls are implemented in accordance with the requirements of Appendix B of 10 CFR Part 50 and will continue to be applicable for the PEO.

PVNGS procedures utilized include:

1) Condition Reporting Process

2) Repair/ Replacements-ASME Section XI

10. Operating Experience The PVNGS pressurizer surge line welds and sentinel pressurizer surge line elbow base metal were examined ultrasonically during each Units most recent refueling outage (Unit 1-Spring 2022, Unit 3-Fall 2022, Unit 2-Spring 2023). No reportable flaws were identified in any of the examinations. The programmatic operating experience activities described in relevant station procedures ensure adequate evaluation of operating experience on an ongoing basis to address age-related degradation and aging management of the pressurizer surge lines.

There have been no incidents of thermal fatigue cracking in the pressurizer surge line piping of U.S. Pressurized Water Reactor (PWR) plants. However, the effects of high thermal cycles and environmental fatigue are recognized as potential contributors to plant aging (Reference 9). There are numerous industry programs in place to identify, monitor and mitigate the effects of thermal cycling and thermal fatigue cracking in PWRs (e.g., see References 10 and 11), and these lessons and guidelines have been applied to the PVNGS pressurizer surge lines as demonstrated by the combination of fatigue monitoring and inspections of the pressurizer surge lines in order to manage the effects of fatigue for extended plant operation.

The proposed inspections to examine the pressurizer surge line components at the specified interval as shown in Table 3, provides reasonable assurance that potential environmental effects of fatigue will be managed such that the pressurizer surge lines will continue to perform their intended function for the extended PEO in PVNGS Units 1, 2, and 3.

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ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE Corrective actions, confirmation process and administrative controls for license renewal are in accordance with the PVNGS Quality Assurance Program pursuant to 10 CFR Part 50, Appendix B, which governs structures, systems, and components subject to an aging management review.

4.0 IMPLEMENTATION PLAN Upon NRC approval (within 120 days) of the PVNGS pressurizer surge line EAF management approach, the appropriate inspection procedure(s) will be updated accordingly.

5.0 PRECEDENT The proposed method to manage aging due to EAF for the pressurizer surge line is similar to the following applications that have been approved by the NRC:

• Turkey Point, Units 3 and 4, License Renewal Commitment, Submittal of Pressurizer Surge Line Welds Inspection Program (ADAMS Accession Numbers ML12152A156 and ML13141A595).

• St. Lucie, Units 1 and 2 - License Renewal Commitment, Submittal of Pressurizer Surge Line Welds Inspection Program (ADAMS Accession Numbers ML15314A160 and ML16235A138).

• Arkansas Nuclear One, Unit 2, License Renewal Pressurizer Surge Line and Safety Injection Nozzle Inspection (ADAMS Accession Number ML18144A970 and ML19074A028).

6.0 REFERENCES

1. Palo Verde License Renewal Application dated December 11, 2008 and updated through Amendment 31

2. NRC Safety Evaluation Report Related to the License Renewal of Palo Verde Nuclear Generating Station, Units 1, 2, and 3 published as NUREG-1961, dated April 2011 (ADAMS Accession Number ML11095A011)

3. Structural Integrity Report FP-PV-321, Palo Verde 2022 Unit 1 FP4 Update Through 04/30/22-RFO 23, dated August, 2022

4. Structural Integrity Report FP-PV-320, Palo Verde Unit 2 FP4 Update Through 10/30/21-RFO 23, dated April, 2022

5. Structural Integrity Report FP-PV-319, Palo Verde 2021 Unit 3 FP4 Update Through 04/30/21-RFO 22, dated November, 2021

6. Palo Verde Nuclear Generating Station (PVNGS) Units 1, 2, and 3 Updated Final Safety Analysis Report (UFSAR) Revision 22, dated June 2023.

7. NUREG-1800, Revision 2, Standard Review Plan for Review of License Renewal Applications for Nuclear Power Plants, dated December 2010 Page 10

ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE

8. Structural Integrity Report 2000645.402 R0, Flaw Tolerance Evaluation of the Palo Verde Units 1, 2, and 3 Surge Line Piping using ASME Code Section XI, Appendix L, dated March 2, 2023 [Provided as Attachment 1 of this enclosure].

9. Third International Conference on Fatigue of Reactor Components, EPRI/USNRC/CSNI, Seville, Spain, 3-6 October, 2004.

10. Materials Reliability Program: Lessons Learned From PWR Thermal Fatigue Management Training (MRP-83), EPRI, Palo Alto, CA: 2002. 1003666.

11. Materials Reliability Program: Fatigue Management Handbook (MRP-235, Revision 2), EPRI, Palo Alto, CA. 2015. 3002005510.

Page 11

ENCLOSURE PROPOSED METHOD TO MANAGE ENVIRONMENTALLY ASSISTED FATIGUE FOR THE PRESSURIZER SURGE LINE Attachment 1 Structural Integrity Associates Report No. 2000645.402, Flaw Tolerance Evaluation of the Palo Verde Units 1, 2, and 3 Surge Line Piping using ASME Code, Section XI, Appendix L, Revision 0, dated March 2, 2023

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