Revision as of 11:11, 27 April 2019

Text

Fourth Ten-Year Interval Inservice Inspection (ISI) Program Relief Request 4ISIS-04
	ML16035A405
Person / Time
Site:	Columbia
Issue date:	02/04/2016
From:	Javorik A L; Energy Northwest
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	GO2-16-008
	Download: ML16035A405 (11)
	v • d • e

Alex L Javorik Vice President, Engineering P.O. Box 968, Mail Drop PE20 Richland, WA 99352-0968 Ph. 509-377-8555 F. 509-377-4317 aljavorik@energy-northwest.com GO2-16-008 10 CFR 50.55a U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

Subject:

References:

(1) Letter dated April 19, 2013, Sher Bahadur (NRC) to Dennis Madison (BWRVIP), "Final Safety Evaluations of the Boiling Water Reactor Vessel

Internals Project (BWRVIP-241) Report, 'Probabilis tic Fracture Mechanics Evaluation for the Boilin g Water Reactor Nozzle-To-Vessel Shell Welds and Nozzle Blend Radii"(2) Letter dated December 19, 2007, Matthew A. Mitchell (NRC), to Rick Libra (BWRVIP), "Safety Evaluation of Proprietary EPRI Report, 'BWR Vessel and Internals Project, Technical Basis for th e Reduction of Inspection Requirements for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Inner Radius (BWRVIP-108)"

Dear Sir or Madam:

Pursuant to 10 CFR 50.55a(z)(1) Energy Northwest hereby requests NRC approval of the proposed alternate to American Society of Mechanical Engineers (ASME)Section XI, Sub Article IWB-2500 to allow reduced percentage requirements for nozzle to vessel weld and inner radius examinations while still providing an acceptable level of quality and safety. This alternative is requested for the fourth ten-year interval ISI program at Columbia Generating Station. The details of the 10 CFR 50.55a request are provided as Attachment 1.

Approval of Relief Request 4ISI-04 will a llow reduced exam ination require ments through application of ASME Co de Case N-702. The applicability of Code Case N-702 to Columbia Generating Station has been demonstrated by meeting the criteria in Section 5.0 of NRC Safety Evaluation regarding BWRVIP-241 (Reference 1) as shown in Attachment 1.

INSERVICE INSPECTION (ISi) PROGRAM RELIEF REQUEST 41Sl-04 Page 2 Energy Northwest requests approval by February 9, 2017 to accommodate application of the request during the next refueling outage. There are no new commitments made in this submittal.

If you have any questions or require additional information, please contact Lisa Williams at 509-377-8148.

Executed this j rel' day of f'e j f'&ut'J* 2016. A. L. Javorik Vice President, Engineering

Attachment:

As Stated cc: NRC Region IV Administrator NRC NRR Project Manager NRC Sr. Resident Inspector

-988C CD Sonoda -BPN1399 (email) WA Horin -Winston & Strawn RR Cowley-WDOH (email) EFSECutc.wa.gov--

EFSEC (email)

Page 1 of 9 10 CFR 50.55a Relief Request Number 4ISI-04 Alternative Requirements fo r Nozzle Inner Radius and Nozzle-to-Shell Welds Proposed Alternative In Accordance with 10 CFR 50.55a(z)(1)

--Alternative Provides Acceptable Level of Quality and Safety-- 1.ASME Code Component(s) AffectedCode Class: 1

Reference:

American Society of Mechanical Engineers (ASME)Section XI, Table IWB-2500-1 Examination Category: B-D

Item Number:

B3.90 and B3.100 Component Numbers: Reactor Pressure Ve ssel (RPV) Nozzles: N1, N2, N3, N5, N6, N7, N8, N9, N16, and N18 The components in Table 1 are affected by this request.

N1-0 RRC Nozzle to Vessel Weld @ 0 Deg B-D B3.90 N1-0-IR RRC Nozzle Inner Radius @ 0 Deg B-D B3.100 N1-180 RRC Nozzle to Vessel Weld @ 180 Deg B-D B3.90 N1-180-IR RRC Nozzle Inner Radius @ 180 Deg B-D B3.100 N2-30 RRC Nozzle to Vessel Weld @ 30 Deg B-D B3.90 N2-30-IR RRC Nozzle Inner Radius @ 30 Deg B-D B3.100 N2-60 RRC Nozzle to Vessel Weld @ 60 Deg B-D B3.90 N2-60-IR RRC Nozzle Inner Radius @ 60 Deg B-D B3.100 N2-90 RRC Nozzle to Vessel Weld @ 90 Deg B-D B3.90 N2-90-IR RRC Nozzle Inner Radius @ 90 Deg B-D B3.100 N2-120 RRC Nozzle to Vessel Weld @ 120 Deg B-D B3.90 N2-120-IR RRC Nozzle Inner Radius @ 120 Deg B-D B3.100 N2-150 RRC Nozzle to Vessel Weld @ 150 Deg B-D B3.90 N2-150-IR RRC Nozzle Inner Radius @ 150 Deg B-D B3.100 N2-210 RRC Nozzle to Vessel Weld @ 210 Deg B-D B3.90 N2-210-IR RRC Nozzle Inner Radius @ 210 Deg B-D B3.100 N2-240 RRC Nozzle to Vessel Weld @ 240 Deg B-D B3.90 Page 2 of 9

N2-240-IR RRC Nozzle Inner Radius @ 240 Deg B-D B3.100 N2-270 RRC Nozzle to Vessel Weld @ 270 Deg B-D B3.90 N2-270-IR RRC Nozzle Inner Radius @ 270 Deg B-D B3.100 N2-300 RRC Nozzle to Vessel Weld @ 300 Deg B-D B3.90 N2-300-IR RRC Nozzle Inner Radius @ 300 Deg B-D B3.100 N2-330 RRC Nozzle to Vessel Weld @ 330 Deg B-D B3.90 N2-330-IR RRC Nozzle Inner Radius @ 330 Deg B-D B3.100 N3-72 MS Nozzle to Vessel Weld @ 72 Deg B-D B3.90 N3-72-IR MS Nozzle Inner Radius @ 72 Deg B-D B3.100 N3-108 MS Nozzle to Vessel Weld @ 108 Deg B-D B3.90 N3-108-IR MS Nozzle Inner Radius @ 108 Deg B-D B3.100 N3-252 MS Nozzle to Vessel Weld @ 252 Deg B-D B3.90 N3-252-IR MS Nozzle Inner Radius @ 252 Deg B-D B3.100 N3-288 MS Nozzle to Vessel Weld @ 288 Deg B-D B3.90 N3-288-IR MS Nozzle Inner Radius @ 288 Deg B-D B3.100 N5-120 LPCS Nozzle to Vessel Weld @ 120 Deg B-D B3.90 N5-120-IR LPCS Nozzle Inner Radius @120 Deg B-D B3.100 N6-45 LPCI Nozzle to Vessel Weld @ 45 Deg B-D B3.90 N6-45-IR LPCI Nozzle Inner Radius @ 45 Deg B-D B3.100 N6-135 LPCI Nozzle to Vessel Weld @ 135 Deg B-D B3.90 N6-135-IR LPCI Nozzle Inner Radius @135 Deg B-D B3.100 N6-315 LPCI Nozzle to Vessel Weld @ 315 Deg B-D B3.90 N6-315-IR LPCI Nozzle Inner Radius @ 315 Deg B-D B3.100 N9-105 JP Instrumentation Nozzle to Vessel Weld

@ 105 Deg B-D B3.90 N9-105-IR JP Instrumentat ion Nozzle Inner Radius@

105 Deg B-D B3.100 N9-285 JP Instrumentation Nozzle to Vessel Weld

@ 285 Deg B-D B3.90 N9-285-IR JP Instrumentat ion Nozzle Inner Radius@

285 Deg B-D B3.100 N16-240 HPCS Nozzle to Vessel Weld @ 240 Deg B-D B3.90 N16-240-IR HPCS Nozzle Inner Radius @ 240 Deg B-D B3.100 N7 Top Head Spray Nozzle to Top Head Weld B-D B3.90 N7-IR Top Head Spray Nozzle Inner Radius B-D B3.100 Page 3 of 9

N8 Top Head Vent Nozzle to Top Head Weld B-D B3.90 N8-IR Top Head Vent Nozzle Inner Radius B-D B3.100 N18 Top Head Spare Nozzle to Top Head Weld B-D B3.90 N18-IR Top Head Spare Nozzle Inner Radius B-D B3.100 Reactor Recirculation (RRC)

Jet Pump (JP)

Low Pressure Core Spray (LPCS)

Low Pressure Core Injection (LPCI)

High Pressure Core Spray (HPCS)

Main Steam (MS) 2.Applicable Code Edition and AddendaThe applicable ASME Section XI Code Edit ion and Addenda for Columbia Generating Station's (Columbia) fourth ten-year ISI interval is the 2007 Edition through the 2008 Addenda. Additionally, for ultrasonic examinations,Section XI, Appendix VIII, "Performance Demonstration for Ultrasonic Examination Systems," is implemented as required and as modified by 10 CFR 50.55a. 3.Applicable Code RequirementThe applicable Code requirement is contained in Subsection IWB, Table IWB-2500-1, "Examination Category B-D, Full Penetration Welded Nozzles in Vessels." Class 1 nozzle-to-vessel weld and nozzle inner radii examination requirement s are delineated in Item Number B3.90 "Nozzle-to-Vessel Weld s," and B3.100, "Nozzle Inside Radius Section." The method of examination is volu metric. With respec t to the extent of examination, all nozzles with full penetration welds to the vessel shell (or head) and integrally cast nozzles must be examined each interval. All of the nozzle assemblies identified in Table 1 ar e full penetration welds. 4.Reason for RequestThe Federal Register Notice (FRN) pub lished November 5, 2014, contains the

rulemaking that amends 10 CFR 50.55a to in corporate by reference Regulatory Guide (RG) 1.147, Revision 17, "lns ervice Inspection Code Case Acceptability, ASME Section XI, Division 1." As stated in the FRN, licensees may use the Code Cases listed in RG 1.147 as alternatives to engine ering standards for the construc tion, inservice inspection, and inservice testing of nuclear power plant components. Code Case N-702, "Alternative Requirements for Boiling Wate r Reactor (BWR) Nozzle Inner Radius and Nozzle-to-Shell Welds,Section XI, Divisio n 1," is listed in RG 1.147, Table 2, Page 4 of 9 "Conditionally Acceptable Section XI Code Cases." The required RG 1.147 Condition associated with Code Case N-702 (Reference 4) is as follows: The applicability of Code Case N-702 must be shown by demonstrating that the criteria in Section 5.0 of [Nuclear Regulatory Commission] NRC Safety Evaluation

[SE] regarding [Boiling Water Reacto r (BWR) Vessel and Internals Project] BWRVIP-108 dated December 18, 2007 (ML073600374) or Section 5.0 of NRC Safety Evaluation regarding BWRVIP

-241 dated April 19, 2013 (ML13071A240) are met. The evaluation demonstrating the applicability of the C ode Case shall be reviewed and approved by the NRC prior to the application of the Code Case. In the section of the FRN associated with the NRC responses to comments specific to Code Case N-702 start on page 9 of 40 (79 FR 65783). An excerpt from the FRN is in cluded as follows: Licensees who plan to request relief from the ASME Code,Section XI requirements for RPV nozzle-to-vessel shell welds and nozzle inner radius

sections may reference the BWRVIP-241 r eport as the technical basis for the use of ASME Code Case N-702 as an alternat ive. However, licensees should demonstrate the plant-specific applicability of the BWRVIP-241 report to their units in the relief request by addressing t he conditions and limitat ions specified in Section 5.0 of the NRC Safety Evaluation for BWRVI P-241. The proposed alternative provides an acceptable level of quality and safety based on the technical content of BWRVIP-108 and BWRVIP-241, as endorsed by the NRC SEs. 5.Proposed Alternative and Basis for Use Pursuant to 10 CFR 50.55a(z)(1), relief is requested from performing the required examinations on 100% of the identified nozzle assemblie s in Table 1 above. As an alternative, for all welds and inner radii identified in Tabl e 1, Energy Northwest proposes to examine a minimum of 25% of the nozzle-to-vessel welds and inner radius sections, including at least one nozzle/inner radius section from each system and nominal pipe size, in accordance with Code Case N-702 (Ref erence 4). For the components identified in Table 1, this would mean at least one nozzl e/inner radius section from each of the groups identified in T able 2 will be examined.

Page 5 of 9

RRC Outlet (N1) 2 1 RRC Inlet (N2) 10 3 Main Steam (N3) 4 1 Core Spray (N5, N16) 2 1 Reactor Low Pressure Injection (LPCI) (N6) 3 1 Top Head Nozzles (N7, N8, N18) 3 1 Jet Pump (N9) 2 1 Code Case N-702 stipulates that VT-1 examination may be used in lieu of the volumetric examination for the inner radii (Item No. B3.100). Energy Northwest will utilize Code Case N-648-1 with associated required RG 1.147 Conditions if VT-1 examinations are performed in lieu of volumetric examinations.

The Basis for Use is as follows:

Electrical Power Research Institute (EPR I)Topical report BWRVIP-241, "BWR Vessel and Internals Project Probabilistic Fracture Mechanics Evaluation for the Nozzle-to-Vessel Shell Welds and Nozzle Blend Radii" (hereafter referred to as BWRVIP-241) (Reference 2), documents supplemental analyses for BWR RPV recirculation inlet and

outlet nozzle-to-shell welds and nozzle inner radii. BWRVIP-241 was submitted to address the limitations and conditions specif ied in the December 19, 2007, safety evaluation (SE) (Reference 5) for the BWRVIP-108NP report, "BWR Vessel and Internals Project, Technical Basis for the Reduction of Inspection Requirements for the Nozzle-to-Vessel Shell Welds and Nozzle I nner Radii". The BWRVIP-108NP (Reference 1) report contains the technical basis supporting Amer ican Society of Mechanical Engineers (ASME Code) Case N-702, "Alternative Requirements for Boiling Water Reactor (BWR) Nozzle Inner Radius and Nozzle-to-Shell Welds," for reducing the inspection of RPV nozzle-to-vessel shell welds and nozzle inner radius areas from 100 percent to 25 percent of the nozzles for each nozzle type during each 10-year interval. Based on the tw o evaluations (BWRVIP-241 and BWRVIP-108NP), the failure probabilities due to a low tem perature over pressure (LTOP) event at the nozzle blend radius region and the nozzl e-to-vessel shell weld for Columbia recirculation nozzles are very low and meet the NRC safety goal.

Based on the results of this evaluation, the report concluded that the inspection of 25% of each nozzle type is technically justified as per Code Case N-702.

EPRI Report BWRVIP-241 received a final NRC SE on April 19, 2013 (ML13071A240) (Reference 6). In the SE, Section 5.0 "Conditions and Limitations" indicates that each licensee who plans to request relief from th e ASME Code,Section XI requirements for Page 6 of 9 RPV nozzle-to-vessel shell welds and nozzle inner radius sections may reference BWRVIP-241 report as the technical basis fo r the use of ASME Code Case N-702 as an alternative. However, each licensee should dem onstrate the plant-specif ic applicability of the BWRVIP-241 report to their units in the relief request by demonstrating all of the following: (1) The maximum Reactor Pressure Vessel (RPV) heatup/cooldown rate is limited to less than 115°F per hour.

The Columbia Technical Specification limit s the heatup/cooldown rate to less than or equal to 100 °F in any one hour period.

For the Recirculation Inlet Nozzles (N2) the following criter ia must be met:

(2) (pr/t)/C RPV1.15. (3) [p(r o 2 +r i 2)/(r o 2-r i 2)]/C NOZZLE1.47. For the Recirculation Outlet Nozzles (N1) the following criteria must be met:

(4) (pr/t)/C RPV1.15. (5) [p (r o 2+r i 2)/(r o 2-r i 2 )]/CNOZZLE1.59. The terms to be used in the NRC SE Section 5 applicability evaluations criteria 2-4 are:

C RPV = recirculation inlet nozzles N2 (from BWRVIP-241 model) = 19332 CNOZZLE = recirculation inlet nozzles N2 (from BWRVIP-241 model) = 1637 C RPV = recirculation outlet nozzles N1 (from BWRVIP-241 model) = 16171 CNOZZLE = recirculation outlet nozzles N1 (from BWRVIP-241 model) = 1977 p = RPV normal operating pressure (psi) r = RPV inner radius (inch) t = RPV wall thickness (inch)

r i = Nozzle inner radius (inch) r o = Nozzle outer radius (inch)

Page 7 of 9 Table 3 below summarizes these results.

Outlet Nozzles (N1)

C nozzle C RPV p

r t (min) r i r o Criteria (4) 1.15 Criteria (5) 1.59 1977 16171 1035 127 9.5 10.8 15.4 0.86 1.54 Inlet Nozzles (N2)

C nozzle C RPV p

r t (min) r i r o Criteria (2) 1.15 Criteria (3) 1.47 1637 19332 1035 127 9.5 5.8 10.0 0.72 1.27

The results in Table 3 show that Colu mbia meets the condi tional requirements established in Section 5.0 of the NRC SE. (Reference 6) Additionally, Columbia evaluated operational experience (OE) from Elec trical Power Research Institute (EPRI) to the BWRVIP Committee Members dated A ugust 31, 2012 (Reference 9) regarding fluence assumptions in BWRVIP-108NP (Ref erence 1) and determined it was applicable to Columbia's N6 nozzle. In response Columbia had a plant specific analysis performed (Reference 10) to verify that neither t he thermal cycles nor the fluence level would adversely impact the outcome of the probabilistic fracture mechanics analysis that formed the basis of BWRVIP-108NP. The plant specific analysis shows that the CGS Plant N1 nozzles meet the acceptable failure probability even when considering fluence levels predicted in the beltl ine region to 60 years of oper ation, this bounding analysis qualifies all RPV nozzles with full penetration welds (except feedwater and control rod

drive return nozzles) for reduced inspection using ASME Code Case N-702 to the end of the period of ex tended operation.

A review of the most recent examination results for the components listed in Table 1 show no recordable indications or indications exceeding ASME limits have been detected. Greater than 90% examination coverage has been achieved on all of the examinations with the exception of N3-72, N3-252, N3-288, N5-120, N6-45, N6-135 and N18 which had limited coverage relief granted by the NRC. (See References 13 and 14 respectively.)

Based upon the above information, the RRC inlet and outlet nozzles meet the NRC SE criteria as set forth in Reference 6 and therefore Code Case N-702 is applicable. The RPV is low alloy steel plate specification SA-533 grade B class I, the nozzles are low alloy steel forging specification SA-508 class 2 and the weld metal used in the welds

specified in Table 1 is carbon/

low alloy steel which are the ty pical materials identified in BWRVIP-108NP therefore, the BWRVIP-108NP evaluation is applicable and appropriate. A bounding plant specific analysis shows that the nozzles meet the acceptable failure probability even when considering fluence levels predicted in the beltline region to 60 years of operation. (Reference 10) A review of the inspection history shows no unacceptable indications report ed to date. Theref ore, use of Code Case N-702 provides Page 8 of 9 an acceptable level of quality and safety pursuant to 10 CFR 50.55a(z)(1) for all Inlet and Outlet nozzle-to-vessel shell welds and nozzle i nner radii sections identified in Table 1. 6.Duration of Proposed Alternative The duration of this request is for the fourth ten-year inservice inspection interval ending December 12, 2025. 7.PrecedentsThere are two precedents for this request in the NRC SEs approving Co lumbia's third 10-year ISI interval relief requests 3ISI-09 and 3ISI-14 transmitted by References 7 and 8, respectively. This relief request for the f ourth interval combines the two approved relief requests from the third interval.

Similar relief requests were granted to LaSalle County Station (RR I3R14) Units 1 and 2 and Cooper Nuclear Station (RI-08) (R eferences 11 and 12, respectively). 8.References1.EPRI, Palo Alto, CA, "BWRVIP-108NP: BWR Vessel a nd Internals Project, Technical Basis for the Reduction of In spection Requirement s for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Blend Radii," 1016123, November 2007.2.EPRI, Palo Alto, CA, "BWRVIP-2 41: BWR Vessel and Internals Project, Probabilistic Fracture Mechanics Evaluation for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Blend Radii," 1021005, October 2010.3.ASME Boiler and Pressure Vessel Code, Section Xl, "Rules for Inservice Inspection of Nuclear Power Plant s," 2007 Edition through 2008 Addenda.4.ASME Boiler and Pressure Vessel C ode, Code Case N-702, "AlternativeRequirements for Boiling Water Reactor (BWR) Nozzle Inner Radius and Nozzle-to-Shell Welds, Section Xl, Division 1," February 20, 2004.5.Matthew A. Mitchell, Office of Nucl ear Reactor Regulation, to Rick Libra, BWRVIP Chairman, "Safety Evaluation of Proprietary EPRI Report, 'BWR Vessel and Internals Project, Technical Basis for the Reduction of Inspection

Requirements for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Inner Radius (BWRVIP-108)'," December 19, 2007.6.Sher Bahadur, Office of Nuclear R eactor Regulation, to Dennis Madison, BWRVIP Chairman, "Final Safety Evaluations of the Boiling Water Reactor Vessel Internals Project (BWRVIP)-

241 Report, 'Probabilistic Fracture Mechanics Evaluation for the Boiling Water Reactor Nozzle-To-Vessel Shell

Welds and Nozzle Blend Radii (TAC NO. ME6328)" April 19, 2013.

Page 9 of 9 7.Michael T. Markley, Office of Nuclear R eactor Regulation, to J. V. Parrish, Chief Executive Officer, Energy Northwest, "C olumbia Generating Station - Request for Relief No. 3ISI-09 for the Third 10-Year Inservice Inspection ProgramInterval (TAC NO. MD9850)," dated April 8, 2009."8.Eric R. Oesterle, Office of Nuclear Reactor Regulation, to Mark E. Reddemann,Chief Executive Officer, Energy Nort hwest, "Columbia Generating Station -

Request for Alternative 3ISI-14 to the Requirements of t he ASME Code (TAC NO. MF 3435)," dated February 13, 2015.9.Chuck Wirtz, FirstEnergy, BWRVIP Integration Chairman and Randy Stark, EPRI, BWRVIP Program Manager, to All BWRVIP Committee Members,"BWRVIP Support of ASME Code Case N-702 Inservice Inspection Relief,"

August 31, 2012.10.Structural Integrity Associates, Inc.

Calculation, "Code Case N-702 Evaluation of the Columbia Generating Station," October 30, 2014 (Columbia CVI/CAL 1012-00,18). 11.Travis L Tate, Office of Nuclear Reacto r Regulation, to Bryan C. Hanson, SeniorVice President, Exelon Generation Company, LLC, President and Chief Nuclear Office (CNO), Exelon Nuclear, "LaSalle County Station, Units 1 and 2, Relieffrom the Requirements of the ASME Code Re: RR I3R 14, Proposed Alternativeto the Examination Requirements for Nozzle-to-Vessel Welds and Inner Radii Sections in Accordance with 10 CF R 50.55a(z)(1) (TAC Nos. MF5654 and

MF5655)," October 30, 2015.12.Michael T Markley, Office of Nuclear Reactor Regulation, to Oscar A Limpias, Vice President-Nuclear and CNO, Nebr aska Public Power District, "Cooper Nuclear Station - Relief Request No. RI-08, Revision 0 Applicable to Fourth 10-

Year Inservice Inspection Interval (TAC No. MF4429)," May 20, 2015.13.Thomas G. Holtz, Office of Nuclear Reactor Regulation, to J. V. Parrish, Chief Executive Officer, Energy Northwest, "C olumbia Generating Station - Request for Relief No. 2ISI-32 for the Second 10-Year Inservice Inspection Program Interval (TAC No. MD3905)

," December 18, 2007.14.William H Bateman, Office of Nuclear Reactor Regulation, to J. V. Parrish, Vice President Nuclear Operations, Washi ngton Public Power Supply System,"Evaluation of the Second Ten-Year Interval Inservice Inspection Program Plan and Associated Relief Requests for t he Washington Public Power Supply System (WPPSS) Nuclear Project No. 2 (WNP-2) (TAC No. M91352),"

December 12, 1995.