ML093640043

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Response to 11/03/09 & 12/04/09 Request for Additional Information Re Reactor Vessel & Reactor Coolant Pumps for the Review of License Renewal Application & Amendment No. 5
ML093640043
Person / Time
Site: Palo Verde  Arizona Public Service icon.png
Issue date: 12/18/2009
From: Mims D
Arizona Public Service Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
102-06108-DCM/GAM
Download: ML093640043 (19)
v • d • e


Text

Z-A A subsidiaryof Pinnacle West Capital Corporation Dwight C. Mims Mail Station 7605 Palo Verde Nuclear Vice President Tel. 623-393-5403 P.O. Box 52034 Generating Station Regulatory Affairs and Plant Improvement Fax 623-393-6077 Phoenix, Arizona 85072-2034 102-06108-DCM/GAM December 18, 2009 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Dear Sirs:

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Docket Nos. STN 50-528, 50-529 and 50-530 Response to November 3, and December 4, 2009, Request for Additional Information Regarding Reactor Vessel and Reactor Coolant Pumps for the Review of the PVNGS License Renewal Application, and License Renewal Application Amendment No. 5 By letter dated November 3, 2009, as supplemented by letter dated December 4, 2009, the NRC issued a request for additional information (RAI) related to the PVNGS license renewal application (LRA). Enclosure 1 contains APS's response to the November 3, and December 4, 2009, RAI. Enclosure 2 contains PVNGS LRA updates to reflect changes made as a result of the RAI responses.

APS makes no commitments in this letter. Should you need further information regarding this submittal, please contact Russell A. Stroud, Licensing Section Leader, at (623) 393-5111.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on /Zh f/10 (date)

Sincerely, DOM/RAS/GAM A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

  • Comanche Peak
  • Diablo Canyon
  • Palo Verde
  • San Onofre
  • Wolf Creek

K ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Response to November 3, and December 4, 2009, Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station License Renewal Application Page 2

Enclosures:

1. Response to November 3, and December 4, 2009, Request for Additional Information Regarding Reactor Vessel and Reactor Coolant Pumps for the Review of the PVNGS License Renewal Application
2. Palo Verde Nuclear Generating Station License Renewal Application Amendment No. 5 cc: E. E. Collins Jr. NRC Region IV Regional Administrator J. R. Hall NRC NRR Project Manager R. I. Treadway NRC Senior Resident Inspector for PVNGS L. M. Regner NRC License Renewal Project Manager

ENCLOSURE 1 Response to November 3, and December 4, 2009, Request for Additional Information Regarding Reactor Vessel and Reactor Coolant Pumps for the Review of the PVNGS License Renewal Application

Enclosure 1 Response to November 3, and December 4, 2009, Request for Additional Information for the Review of the PVNGS License Renewal Application Part I. License Renewal Application (LRA) Time-Limited Aging Analyses (TLAAs) 4.2, "Reactor Vessel Neutron Embrittlement Analysis," and 4.7.7, "Absence of a TLAA for a Reactor Coolant Pump Flywheel Fatigue Crack Growth Analysis."

NRC RAI 4.2.1-1 LRA Tables 4.2-3 to 4.2-5 documented the 54 effective full power year (EFPY) upper-shelf energy (USE) values for PVNGS, Units 1, 2, and 3. LRA Tables 4.2-6 to 4.2-8 documented their corresponding 54 EFPY RTPTS values. The staff found mistakes in these tables and requests corrections:

1. In Table 4.2-3 for Unit 1, the 54 EFPY USE values for the intermediate shell plates M-6701-2 and M-6701-3 are incorrect.
2. In Table 4.2-4 for Unit 2, all unirradiated USE values are incorrect.
3. In Table 4.2-6 for Unit 1, the nickel content for the lower shell axial welds is incorrect.

APS Response to RAI 4.2.1-1 The following corrections to Tables 4.2-3, 4.2-4, 4.2-6 are provided in LRA Amendment No. 5 in Enclosure 2 to this letter:

1. In Table 4.2-3 for PVNGS Unit 1, the 54 EFPY USE value for the intermediate shell plate M-6701-2 is being revised from 78.6 ft-lb to 75.4 ft-lb and the 54 EFPY USE value for the intermediate shell plate M-6701-3 is being revised from 75.4 ft-lb to 78.6 ft-lb.
2. In Table 4.2-4 for PVNGS Unit 2, the unirradiated USE values are being revised to reflect the correct Unit 2 values.
3. In Table 4.2-6 for PVNGS Unit 1, the nickel content for the lower shell axial welds is being revised from 0.035 percent to 0.079 percent.

In addition to the corrections described above, LRA Amendment No. 5 in Enclosure 2 contains the following corrections to Tables 4.2-4, 4.2-7, and 4.2-8:

4. In Tables 4.2-4 and 4.2-7, the heat numbers in the last lines are being corrected from 3P7869 to 4P7869.
5. In Table 4.2-4, the % Drop in USE @ EOL for Unit 2 lower shell axial welds 101-142A, B, C is being corrected from 21.44 to 23.94.

1

Enclosure 1 Response to November 3, and December 4, 2009, Request for Additional Information for the Review of the PVNGS License Renewal Application

6. In Table 4.2-8, the 54 EFPY RTPTS values for the first three lines were transposed with the next three. From the top down, they are being corrected to read 28.1, 68.1, 8.1, 38.1, 54.7, and 48.1 degrees Fahrenheit, instead of 38.1, 54.7, 48.1, 28.1, 68.1, and 8.1.

These errors have been entered into the PVNGS corrective action program as Palo Verde Action Request (PVAR) 3412350.

NRC RAI 4.2.1-2 LRA Section 4.2.1, "Neutron Fluence, Upper Shelf Energy and Adjusted Reference Temperature (Fluence, USE, and ART)," Tables 4.2-3 to 4.2-5 listed 54 EPPY USE values for the beltline materials of PVNGS, Units 1, 2, and 3. They are all derived in accordance with Regulatory Guide (RG) 1.99, Revision (Rev.) 2, "Radiation Embrittlement of Reactor Vessel Materials," without using surveillance data. The applicant also stated, "[t]he most recent coupon examination results also show that the decline in USE and increase in RTNDT[reference temperature] in plate and weld materials are less than originally predicted by RG 1.99, Revision 2." One can conservatively estimate the ART and USE values for the beltline materials without using credible multiple surveillance data only when the estimates based on all measured surveillance data in accordance with RG 1.99, Rev. 2 are lower. Please provide your basis for not considering all surveillance data. Add references (i.e., surveillance reports) to support your clarification.

APS Response to RAI 4.2.1-2

1. The following statement is from LRA Section 4.2.1 on page 4.2-6:

The most recent coupon examination results also show that the decline in USE and increase in RTNDT [reference temperature]in plate and weld materials are less than originallypredicted by Regulatory Guide 1.99, Revision 2, with only one exception. The exception is the Unit 3 weld coupon set....

This statement is a paraphrase from the executive summaries of the most-recent coupon examination reports for each of the three Palo Verde units (Enclosures in References 1, 2, and 3, Executive Summary of each). This statement pertains to LRA Table 4.2-2, which summarizes these surveillance results. It is not in support of the embrittlement parameter projections of Tables 4.2-3 and following, but applies only to the results of these most-recent, 2300 capsule examination results, The statement means only that (with one exception) the most-recently-withdrawn coupons (and, therefore, those with the highest exposure) exhibit less-severe reductions in toughness parameters than would be predicted using chemistry data and Regulatory Guide 1.99, Revision 2 methods, at the actual fluence measured by the internal coupon dosimetry.

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Enclosure 1 Response to November 3, and December 4, 2009, Request for Additional Information for the Review of the PVNGS License Renewal Application The results of the earlier coupon examinations are consistent with the most-recent results, and are summarized in the credibility evaluation of these three most-recent examination reports (Enclosures in References 1, 2, and 3, Appendix D of each).

2. The predictions of 54 EFPY values without surveillance data for the summary tables of this section are necessary in order to provide a common basis for comparison of predicted values at the end of the period of extended operation. These predictions demonstrate that the surveillance program should be able to continue to demonstrate adequate margins of embrittlement parameters to analytic and regulatory limits for the period of extended operation. However the disposition of these TLAAs does not depend on a 10 CFR 54.21 (c)(1)(i) validation of these predictions "without surveillance data" alone. Validation of the existing lifetime embrittlement projections also depends on the fact that with low-leakage cores the present predictions of a 54 EFPY lifetime neutron fluence are less than the design basis fluence used for these embrittlement projections. The disposition also depends on 10 CFR 54.21(c)(1)(iii) aging management (the surveillance program).

See "Disposition...," LRA pages 4.2-6 and -7.

References for RAI 4.2.1-2:

1. Letter no. 102-05242 from APS to the NRC, "PaloVerde Nuclear Generating Station Unit 1 Reactor Vessel Material Surveillance Capsule at 2300, April 5, 2005 (transmittal of WCAP-16374-NP, "Analysis of Capsule 2300 from Arizona Public Service Company Palo Verde Unit 1 Reactor Vessel Radiation Surveillance Program," February 2005) (ADAMS Accession No. not publicly available).
2. Letter no. 102-05457 from APS to the NRC, "Palo Verde Nuclear Generating Station Unit 2 Reactor Vessel Material Surveillance Capsule at 2300," April 4, 2006 (transmittal of WCAP-16524-NP, "Analysis of Capsule 2300 from Arizona Public Service Company Palo Verde Unit 2 Reactor Vessel Radiation Surveillance Program," February 2006) (ADAMS Accession No. ML061040586).
3. Letter no. 102-05348 from APS to the NRC, "Palo Verde Nuclear Generating Station Unit 3 Analysis of Reactor Vessel Material Surveillance Capsule at 2300,"

September 26, 2005 (transmittal of WCAP-16449-NP, "Analysis of Capsule 2300 from Arizona Public Service Company Palo Verde Unit 3 Reactor Vessel Radiation Surveillance Program," August 2005) (ADAMS Accession No.

ML053390139).

3

Enclosure 1 Response to November 3, and December 4, 2009, Request for Additional Information for the Review of the PVNGS License Renewal Application NRC RAI 4.2.1-3 The staff found that the WCAP-1 5589 report (ML003764418), "Analysis of Capsule 380 from the Arizona Public Service Company Palo Verde Unit 1 Reactor Vessel Radiation Surveillance Program," labeled two surveillance data from Capsule 38' as intermediate shell plate M-6701-2 and used them in the chemistry factor calculation for this limiting plate. However, the WCAP-16374 report (ML051020500), "Analysis of Capsule 2300 from the Arizona Public Service Company Palo Verde Unit 1 Reactor Vessel Radiation Surveillance Program," dropped the two Capsule 380 surveillance data from the chemistry factor calculation for intermediate shell plate M-6701-2. A statement on page D-3 of the WCAP-16374 report indicates a possible misidentification of specimens:

"[t]he lower shell plate M431 1-1 also has surveillance data but only one set up to this point (from Capsule 380), thus it will not be evaluated." Please confirm that you misidentified surveillance specimens for PVNGS, Unit 1 in the WCAP-1 5589 report and explain how it happened. Or, explain the basis of discarding surveillance data from Capsule 380 in the WCAP-1 6374 report in calculating the chemistry factor for intermediate shell plate M-6701-2. Please confirm that Units 2 and 3, did not experience similar misidentifications as Unit 1.

APS Response to RAI 4.2.1-3 Two PVNGS Unit 1 Capsule 380 data points were inadvertently labeled as intermediate shell plate M-6701-2 in Revision 0 of WCAP-1 5589, October 2000, which was submitted to the NRC in APS letter no. 102-04500, October 20, 2000.

This labeling error was corrected in Revision 1 to WCAP-1 5589, March 2003. All PVNGS Unit 1 base metal data from Capsule 380 are correctly labeled as lower shell plate M-431.1-1 in Revision 1 to WCAP-15589. APS submitted Revision 1 to WCAP-1 5589 to the NRC in letter no. 102-06094, dated November 13, 2009 (Agencywide Document Access and Management System [ADAMS] Accession No.

ML093290263).

WCAP-1 6374-NP, Revision 0, "Analysis of Capsule 2300 from Arizona Public Service Company Palo Verde Unit 1 Reactor Vessel Radiation Surveillance Program," excluded the Capsule 380 data from the chemistry factor calculation for intermediate shell plate M-6701-2 because those data were from lower shell plate M-4311-1. Data from plate M-4311-1 were not evaluated in WCAP-16374 because results were available from only a single surveillance capsule, and thus were insufficient to evaluate the chemistry factor.

A possible contributor to the initial mislabeling of Unit 1 Capsule 380 data points in WCAP-15589 as intermediate shell plate M-6701-2 is that three of the Unit 1 capsules are lower shell plate M-431 1-1 base metal material, and the other three are intermediate shell plate M-6701-2 base metal material (UFSAR Table 5.3-13).

The 380 capsule report inadvertently labeled the capsule with the material in one of the other Unit 1 capsules.

4

Enclosure 1 Response to November 3, and December 4, 2009, Request for Additional Information for the Review of the PVNGS License Renewal Application PVNGS Units 2 and 3 each use a single surveillance plate (lower shell) base metal material in each surveillance program as shown in UFSAR Tables 5.3-14 and 5.3-15. The current reactor vessel surveillance program reports and the current UFSAR, Revision 15, correctly identify the surveillance program plate for Units 2 and 3. Therefore, it is confirmed that PVNGS Units 2 and 3 did not experience similar misidentifications as did PVNGS Unit 1 with respect to the surveillance plate material.

NRC RAI 4.7.7-1 The title of LRA Section 4.7.7 is "Absence of a TLAA for a Reactor Coolant Pump Flywheel Fatigue Crack Growth Analysis." To demonstrate that this is true, please confirm that the underlying stress and fracture mechanics analysis for the flywheels is not a part of the current licensing basis for PVNGS, Units 1, 2, and 3, or the underlying stress and fracture mechanics analysis does not contain fatigue and fatigue crack evaluations.

APS Response to RAI 4.7.7-1 The underlying stress and fracture mechanics analysis for the reactor coolant pump (RCP) flywheels does not contain fatigue and fatigue crack evaluations.

Technical Specification 5.5.7, Reactor Coolant Pump Flywheel Inspection Program, and Updated Final Safety Analysis Report 5.4.1.1, Pump Flywheel Integrity, provide the current licensing basis for the Palo Verde flywheel materials and their inspections. The RCP flywheel integrity description in UFSAR 5.4.1.1 was taken from Combustion Engineering Standard Safety Analysis Report (CESSAR) Section 5.4.1.1, which was based on the NRC regulatory position in Regulatory Guide 1.14, Revision 0 (Safety Guide 14). The NRC review of the RCP flywheel integrity descriptions in CESSAR 5.4.1.1 was documented in the Safety Evaluation Report for CESSAR System 80, (NUREG-0852) and Safety Evaluation Report Related to the Operation of PVNGS Units 1,2, and 3 (NUREG-0857).

Regulatory Guide 1.14, Revision 0, (Safety Guide 14) Section B, Discussion, includes the following:

Reactorcoolant pump flywheels are of a simple geometric shape, and normally are made of a ductile material. Their quality can be closely controlled, and their service conditions are not severe; therefore, the use of suitable material, and adequate design and inservice inspection can provide a sufficiently small probabilityof a flywheel failure that the consequences of failure need not be protected against.

5

Enclosure I Response to November 3, and December 4, 2009, Request for Additional Information for the Review of the PVNGS License Renewal Application The stress and fracture mechanics analysis in the RCP flywheel design report does not contain any fatigue or time-dependent fatigue crack evaluations. The design report includes an evaluation of cracks that will permit either a ductile or brittle burst at overspeed. This evaluation uses a comparison of applied stress intensity factor K, to the expected material toughness stress intensity factor K1c to demonstrate that the crack sizes required for brittle fracture at design overspeed are much larger than those detectable by anticipated inspection methods. However, it includes neither a crack growth nor a fatigue analysis; nor any other indication of a time-dependent analysis supporting the safety determination. Therefore, the underlying stress and fracture mechanics analysis does not contain any fatigue or time-dependent fatigue crack evaluations.

Regulatory Guide 1.14, Revision 0, (Safety Guide 14) provided no guidance or recommendation for a crack evaluation similar to that included in the RCP flywheel design report, nor for a crack growth or fatigue analysis, nor for any other analysis that might be a TLAA.

The UFSAR 5.4.1.1 description of the Palo Verde RCP flywheel design criteria includes a minimum dynamic stress intensity factor Kic, consistent with the Regulatory Guide 1.14, Revision 0, (Safety Guide 14) Regulatory Position C.1 .c recommendation for a minimum K1c of 100 ksi-in1A (at operating temperature). The RCP flywheel design report addresses this recommendation for a minimum K1c of 100 ksi-in1A. The RCP flywheel design report closely follows the alternative method suggested by Regulatory Guide 1.14, Revision 0, (Safety Guide 14) Regulatory Position C.1.c.3. That is, it demonstrates compliance with the recommendation for a minimum K1c of 100 ksi-in' at operating temperature by (1) identifying a lower-bound Kic curve for the same type of material, and (2) translating the curve along the temperature axis until a minimum Kic of 45 ksi-in'* occurs at the nil-ductility transition temperature (NDT) of the material.

The flywheels are also not subject to neutron radiation embrittlement or thermal embrittlement, and, therefore, no change in Kic is expected in a design lifetime (including license extension). Therefore the use of a minimum K1c material acceptance criterion does not imply a TLAA.

Technical Specification 5.5.7 requires an RCP flywheel inspection program to provide for the inspection of each RCP flywheel per the recommendations of regulatory position c.4.b of Regulatory Guide 1.14, Revision 0, October 1971.

NRC RAI 4.7.7-2 Discuss the evaluation of past examination results. Discussion should include results from the surface examination of all exposed surfaces and the complete ultrasonic volumetric examinations which were conducted approximately every 10 years. Please confirm that no flaws were indicated from the examinations.

6

Enclosure 1 Response to November 3, and December 4, 2009, Request for Additional Information for the Review of the PVNGS License Renewal Application APS Response to RAI 4.7.7-2 APS has performed ultrasonic test examinations approximately every three years and eddy current test examinations every 10 years in accordance with the Inservice Inspection (ISI) program on the flywheel of each of the RCPs at PVNGS Units 1, 2, and 3. No indications of degradation have been found in any of the RCP flywheels, and, therefore, no flaw evaluations have been performed.

Part II. Aging Management Program (AMP) B2.1.15, "Reactor Vessel Surveillance" NRC RAI B2.1.15-1 LRA Section B2.1.15 states under Program

Description:

PVNGS, Units 1,2, and 3, determined neutron embrittlement effects, consistent with RG 1.99, Rev. 2, by option 1[b], "Neutron Embrittlement Using Surveillance Data." This is misleading. The staff found from its review of LRA Section 4.2 that, after having considered option 1b of Generic Aging Lessons Learned Report (GALL) Aging Management Program (AMP)

XI.M31, you actually used the more conservative option la, "Neutron Embrittlement Using Chemistry Tables" to evaluate USE and pressure-temperature limits for 60 years.

Both options are consistent with RG 1.99, Rev. 2. Please make the necessary clarification.

APS Response to RAI B2.1.15-1 See also the response to RAI 4.2.1-2.

This apparent inconsistency between LRA Sections 4.2 and B2.1.15 is due to their different purposes. Section 4.2 includes tables and descriptions of projections of embrittlement parameters through the period of extended operation, particularly Tables 4.2-3 through 4.2-8. For simplicity and uniformity, these tables were constructed using chemistry data and tables, which, if applied to the reactor vessel surveillance program, would correspond to GALL XI.M31,option 1.a. Section 4.2 also briefly describes the surveillance program which is more fully described in Section B2.1.15; but Section 4.2 Tables 4.2-3 through 4.2-8 only present projections of embrittlement effects before results of surveillance data are applied. They do not reflect results of the reactor vessel surveillance program.

Section B2.1.15 contains the description of the reactor vessel surveillance program (the neutron fluence monitoring and vessel material coupon surveillance program) as it presently exists and as it will be implemented through the period of extended operation.

This program will evaluate embrittlement parameters based on surveillance data, that is, using GALL XI.M31 option 1.b, as described.

7

Enclosure 1 Response to November 3, and December 4, 2009, Request for Additional Informationfor the Review of the PVNGS License Renewal Application The use of the past tense of the verb in Section B2.1.15 was therefore incorrect. The sentence is being revised to read "PVNGS determines neutron embrittlement effects, consistent with Regulatory Guide 1.99, Rev. 2, by option 1[b]." (See LRA Amendment 5 in Enclosure 2). That is, the surveillanceprogram determines effects by option 1.b.

NRC RAI B2.1.15-2 LRA Section B2.1.15 stated under Operating Experience what the recent examination results of the reactor vessel surveillance data revealed regarding neutron fluence, USE, and RTNDT. Evaluation of operating experience of this PVNGS AMP should not be limited to "the recent examination results." Please expand your discussion to include all tested reactor vessel surveillance data.

APS Response to RAI B2.1.15-2 Under "Operating Experience," LRA Section B2.1.15 states that "The recent [reactor vessel coupon] examination results ... show that decreases in USE and increases in RTNDT are less than projected..." (with a minor exception, as described). The most recently examined coupons were exposed for the entire operating lives of the vessels up to the point of their withdrawal, and are, therefore, the best available indicators of lifetime embrittlement effects, superseding the results of examinations of earlier coupon sets withdrawn at lower neutron fluences.

Please see also LRA Section 4.2.1, and the APS response to RAI 4.2.1-2, which includes the citations of the docketed, most recent coupon examination reports for Palo Verde Units 1, 2, and 3. The results of the earlier coupon examinations are consistent with the most recent results, and are summarized in the Appendix D credibility evaluation of these three most-recent examination reports.

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ENCLOSURE 2 Palo Verde Nuclear Generating Station License Renewal Application Amendment No. 5

Palo Verde Nuclear Generating Station License Renewal Application Amendment No. 5 Source: RAI 4.2.1-1 LRA Tables 4.2-3, 4.2-4, 4.2-6, 4.2-7, and 4.2-8 (LRA pages 4.2-13, 4.2-14, 4.2-16, 4.2-17, and 4.2-18) are revised as shown on the following pages.

-Section 4 TIME-LIMITED AGING ANALYSES Table 4.2 PVNGS Unit 1 Vessel Material USE Projectedat 60 Years (54 EFPY) (Note 1)

Material Description _..._ ..

'L 14 T. Drop in 5EFPY

`5Unirraiaid EOL USE Reactor... Vessel

  • Reactor Vessel Heat'.>

e.t ..e : - * .Cu

.- Belthine H. US' USE "I, Fluence 19 S. Projected Acceptance Type wt%.... "..USE Criterion f

Region Location Number ft-lbf -. (E>1 MeV. . , , ftI Lower Shell Plate 62467-1 A 533B 0.040 134 1.681 21.44 105.3 -50 M-431 1-1Plate Lower Shell Plate 62817-1 A 533B 0.030 127 1.681 21.44 99.8 a50 M-4311-2 Lower Shell Plate 62722-1 A 533B 0.030 142 1.681 21.44 111.6 a50 M-4311-3 Intermediate Shell Plate C4142-1 A533B 0.070 83 1.681 21.44 5 50 M-6701-1 C4142-1 A_533B 000 81612.__->

Intermediate Shell Plate C4188-2 A533B 0.060 96 1.681 21.44 75.478 a50 M-6701-2 C48-__5__.6 9_.8_2.4-5 Intermediate Shell Plate C4188-1 A 533B 0.060 100 1.681 21.44 78.67&§4 -50 Intermediate Shell Axial Welds 4P6052 Linde 0091 0.047(3) 200 1.681 21.44 57-50 101-124A, B, CI Lower Shell Axial Welds 90071 Linde 0091 0.035(3) 140 1.681 21.44 110.0 a50 101-142A, B, C Cirumerntil7el 4137869 Linde 124 0.031 (3) 90 1.681 21.44 70.7 ->50 1 The information in this table is extracted from the RVID and generated assuming a clad-metal EOL fluence of 3.29 x 1019 high-2 2 energy neutrons/cm .

3  % Drop in USE at EOL is determined using RG 1.99 Rev. 2, Position 1.2.

The weld information is the best-estimate value from CE-NPSD-1039, instead of the material's measured value.

Palo Verde Nuclear Generating Station Page 4.2-13 License Renewal Application

Section 4 TIME-LIMITED AGING ANALYSES Table 4.2 PVNGS Unit 2 Vessel Material USE Projectedat 60 Years (54 EFPY) (Note 1)

Material Description EOL 1/4 T 54 EFPY -EOL USE ,

Unirradiated Fluence".2  % Drop in Cu 1-.019 nlcm , ,Projected Acceptance Reactor Vessel Beltline Heat - ,Type USE USE 2?.

USE 'Criterion RegionrvLocation ,Number" ft-lbf EOL2r,_

4- - -- - 4 4 - ~ 4 -i-ft-lbf ft-Ibf Lower Shell Plate 64071-1 A 533B '4-34 105 21.44 82.5 :50 F-773-1 0.030 Lower Shell Plate 99.8 t50 21.44 F- -640651 F-77-2 _______ A533B

________ 0.040

__ 12

.__-__

Lower Shell Plate 101.3 Ž50 F-773-3 63987-1 A 533B 0.050 S44-2 129 21.44 Intermediate Fnemeit Shell Plate >50 F-765-4 63427-1 A533B 0.030 83 114 21.44 89.6 Intermediate Shell Plate 63464-1 A 533B 0.030 96 121 95.1 a50 F-765-5 21.44 Intermediate Shell Plate 63716-1 A 533B 0.040 4-00 126 21.44 99.0 Ž50 F-765-6 Intermediate Shell Axial Welds 89833 Linde 124 0.046131 200 100 101-124A, B, C 21.44 78.6 Ž50 Lower Shell Axial Welds 3P7317 Linde 124 0.07413 1 440 100 101-142A, B, C 2-.4-423.94 76.1 Ž50

_______

Circumferential Welds 34P7869' Linde 124 0.03T) 90 95.

101-171 1 * . I 21.44 74.6 Ž50

_34 -_ _

1 The information in this table is extracted from the RVID and generated assuming a clad-metal EOL fluence of 3.29 x 1019 high-2 2 energy neutrons/cm .

3  % Drop in USE at EOL is determined using RG 1.99 Rev. 2, Position 1.2.

3 The weld information is the best-estimate value from CE-NPSD-1039, instead of the material's measured value.

Palo Verde Nudear Generating Station Page 4.2-14 License Renewal Application

Section 4 TIME-LIMITED AGING ANALYSES Table 4.2 PVNGS Unit I Reactor Vessel Limiting RTpTs at 60 Years (54 EFPY) (Note 1)

Material Description Chemical - Neutron Composition, Chemistry InitialFluence 54 EFPY 54 EFPY 54 EFPY Screening I . Margin, Reactor Vessel Heatf , Factors RTNDT @,EOL Fluence ARTPTS ( RTPTS  : Criteria'.

"BeltlineRegionp. Type Ni wt% F*2 ) O.

F 1019 n/cm 2 ' Factor TF F 0 F °F Lowerie Shel Pat Location Number ~~~~~~(E>1 MeV) ____ ___ ___ ____

Lower Shell Plate 62467-1 A 533B 0.040 0.650 26 -10 3.29 1.312 34.1 34.0 58.1 <270 M-431 1-1 Lower Shell Piate 62817-1 A 533B 0.030 0.620 20 -40 3.29 1.312 26.2 26.2 12.5 <270 M-4311-2 I Lower Shell Plate 62722-1 A 533B 0.030 0.640 20 -20 3.29 1.312 26.2 26.2 32.5 <270 M-4311-3 Intermediate Shell 04142- A533B 0.070 0.660 44 30 3.29 1.312 57.7 34.0 121.7 <270 Plate M-6701-1 1 IntermediateShell 4188- A 533B 0.060 0.610 37 40 3.29 1.312 48.5 34.0 122.5 5270 Plate M-6701-2 2 1 Intermediate Pla te Shell C4188-Shell 1 A 533B 0.060 0.610 37 40 3.29 1.312 48.5 34.0 122.5 5270 Plate M-6701-3 1 Intermediate Shell Linde Axial Welds 101- 4P6052 0091 0.047 0.049 30.74 -50 3.29 1.312 40.3 40.3 30.6 <300 124A, B,C 09 Lower Shell Axial Linde 0 0 2.8 2388.0 Welds 90071 0091 0.035 0.079 29.32 -80 3.29 1.312 38.5 38.5 -3.0 300 101-142A, B, C 0091 _

Circumferential 4P7869 Linde 0.031 0.096 28.73 -70 3.29 1.312 37.7 37.7 5.4 <300 Weld 101-171 124 1 The information in this table is extracted from the RVID and generated assuming a clad-metal EOL fluence of 3.29 x 1019 high-2 energy neutrons/cm2.

The Chemistry Factors are determined using RG 1.99 Rev. 2, Position 1.1, Palo Verde Nuclear Generating Station Page 4.2-16 License Renewal Application

Section 4 TIME-LIMITED AGING ANALYSES Table 4.2 PVNGS Unit 2 Reactor Vessel Limiting RTpTs at 60 Years (54 EFPY) (Note 1)

Material Descrption Chemical Neutron Composition. Chemistry Initial, Fluence, 54 EFPY 54 EFPY Margin-2 54 EFPY Screening Reactor Vessel Heat Cu Factors, <RTNT@ EOL Fluence S () RTPTS 2

0 'yeOF

() :7OF 9 2O 0 Beitrine Region' erwt%Tumer Num . N*...wt h/ .. 1 ,101 n/rcm Factor OF,' F. ..

Location ShellPla Lower Shell Plate 64071-1 A 533B 0.030 0.670 20 10 3.29 1.312 26.2 26.2 62.5 !5270 F-773-1 I Lower Shell Plate 64065-1 A 533B 0.040 0.640 26 0 3.29 1.312 34.1 34.0 68.1 !5270 F-773-2 I Lower Shell Plate 63987-1 A 533B 0.050 0.660 31 -60 3.29 1.312 40.7 34.0 14.7 <-270 F-773-3 Intermediate Shell Plate 63427-1 A 533B 0.030 0.670 20 -20 3.29 1.312 26.2 26.2 32.5 <-270 F-765-4 Intermediate Shell Plate 63464-1 A 533B 0.030 0.650 20 10 3.29 1.312 26.2 26.2 62.5 <-270 F-765-5 Intermediate Shell Plate 63716-1 A 533B 0.040 0.670 26 10 3.29 1.312 34.1 34.0 78.1 <-270 F-765-6 Intermediate Shell Linde Axial Welds 89833 124 0.046 0.059 31.51 -60 3.29 1.312 41.3 41.3 22.6 5300 101-124A, B, C Lower Shell Axial Linde Welds 3P7317 0.074 0.067 41.17 -80 3.29 1.312 54.0 54.0 28.0 <-300 101-142A, B,C 124 Circumferential r1 Linde Weld 34P7869 124 0.031 0.096 28.73 -30 3.29 1.312 37.7 37.7 45.4 -300 101-171 __ _ I I I I I I I The information in this table is extracted from the RVID and generated assuming a clad-metal EOL fluence of 3.29 x 1019 high-energy neutrons/cm 2 .

2 The Chemistry Factors are determined using RG 1.99 Rev. 2, Position 1.1.

Palo Verde Nuclear Generating Station Page 4.2-17 License Renewal Application

Section 4 TIME-LIMITED AGING ANALYSES Table 4.2 PVNGS Unit 3 Reactor Vessel Limiting RTpTs at 60 Years (54 EFPY) (Note 1)

Material Description Chemi..al Neutron Composition C___.__ Chemistry. Initiall Fluence 54' E.A5EFPY54 EFPY Screening a

......- Cup Ftrs.s

') ,

ReactorVessel RTNDT @ EOLRp 1Heat

@ 19 Fluen F

s(2 Criteriao'.

Beltline Region type

  • Ni %t */ OF 10 n/... Factor OF

'Locationi K ~umber, 7'~,

.

Wt x ____F___ ZEJieyy I___

Lower 79545-1 A 533B 0.040 0.640 26 -40.0 3.29 1.312 34.1 34.0 44 28.1 <270 F-641 1-1 Lower Shell Plate Lower Shell Plate 79745-1 A 533B 0.040 0.660 26 0.0 3.29 1.312 34.1 34.0 54- 68.1 _270 F-6411-2 I Plate 659-1 A 533B 0.040 0.650 26 -60.0 3.29 1.312 34.1 34.0 48.4 8.1 -_270 Intermeit F-6411-3 Shell Pae*

Intermediate Shell Plate 65202-1 A 533B 0.040 0.620 26 -30.0 3.29 1.312 34.1 34.0 2.4 38.1 *270 F-6407-4 _

Intermediate Shell Plate 65219-1 A533B 0.050 0.610 31 -20.0 3.29 1.312 40.7 34.0 8" 54.7 :5270 F-6407-5 _

Intermediate Shell Lid Plate F-6407-6 79011-1 A 533B 0.040 0.610 26 -20.0 3.29 1.312 34.1 34.0 24 270 Intermediate Shell Linde Axial Welds 4P7869 124 0.031 0.096 28.73 -50 3.29 1.312 37.7 37.7 25.4 <300 101-124A, B,C SAW Lower Shell Axial Linde Welds 4P7869 124 0.031 0.096 28.73 -50 3.29 1.312 37.7 37.7 25.4 5300 101-142A, B, C SAW CircumferentialLid Wed1111 4P7869 124 0.031 0.096 28.73 -70 3.29 1.312 37.7 37.7 5.4 <5300 SAW The information in this table is extracted from the RVID and generated assuming a clad-metal EOL fluence of 3.29 x 1019 high-energy neutrons/cm 2.

2 The Chemistry Factors are determined using RG 1.99 Rev. 2, Position 1.1.

Palo Verde Nuclear Generating Station Page 4.2-18 License Renewal Application

Palo Verde Nuclear Generating Station License Renewal Application Amendment No. 5 Source RAI B2.1.15-1 The second paragraph in Section B2.1.15 on Page B-54 is being revised as follows:

17 2 Since peak neutron fluence at the end of the design life may exceed 10 n/cm (E>1 MeV) and since vessel material coupons were installed, PVNGS determines deteFn4ed neutron embrittlement effects, consistent with Regulatory Guidel.99, Rev.2, by optioni [b], "Neutron Embrittlement Using Surveillance Data." Actual reactor vessel coupons are used. Limiting heat-affected-zone (HAZ) materials were selected from limiting plate materials.

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