NOC-AE-10002578, Request for Relief from ASME Section XI Code Requirements for Weld Examinations (Relief Request RR-ENG-2-55)
| ML102240169 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 07/29/2010 |
| From: | Ruvalcaba M Southern Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| G25, NOC-AE-10002578, RR-ENG-2-55, STI: 32705073 | |
| Download: ML102240169 (10) | |
Text
Nuclear Operating Company South Texas Project Electric GeneratinSStation PO.Box 289 Wadsworth. Texas 77483 -
July 29, 2010 NOC-AE-10002578 File No.: G25 10 CFR 50.55a U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2746 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 Request for Relief from ASME Section XI Code Requirements for Weld Examinations (Relief Request RR-ENG-2-55)
Pursuant to 10 CFR 50.55a(g)(5)(iii), STP Nuclear Operating Company (STPNOC) requests relief from ASME Section Xl requirements for weld examination on the basis of impracticality.
ASME Section Xl Tables IWB-2500-1 and IWC-2500-1 require inservice inspection of Class 1 and Class 2 component welds by nondestructive examination. 100% examination coverage of these welds during the second ten-year inspection interval was impractical because of component configuration and geometry, and because of the limitations of the examination equipment and techniques used to perform these examinations.
The attached discussion includes a list of the affected welds for which relief is requested, the amount of coverage obtained, and the basis and justification for their acceptability. STPNOC requests NRC review and approval of this request by January 31, 2011.
There are no commitments included with this request.
If there are any questions, please contact either Mr. P. L. Walker at (361) 972-8392 or me at (361) 972-7904.
Marco Ruv Icaba Manager, Testing and Programs Engineering PLW
Attachment:
Request for Relief from ASME Section Xl Code Requirements for Weld Examinations (Relief Request RR-ENG-2-55)
STI: 32705073 i5 LZt-4j"
NOC-AE-1 0002578 Page 2 of 2 cc:
(paper copy) (electronic copy)
Regional Administrator, Region IV John Ragan U. S. Nuclear Regulatory Commission Catherine Callaway 612 East Lamar Blvd., Suite 400 Jim von Suskil Arlington, Texas 76011-8064 NRG South Texas LP Mohan C. Thadani A. H. Gutterman, Esquire Senior Project Manager Morgan, Lewis & Bockius LLP U.S. Nuclear Regulatory Commission One White Flint North (MS 8 B1A) 11555 Rockville Pike Mohan C. Thadani Rockville, MD 20852 U. S. Nuclear Regulatory Commission Senior Resident Inspector Kevin Polio U. S. Nuclear Regulatory Commission Richard Pena P.O. Box 289, Mail Code: MN116 E. Alarcon Wadsworth, TX 77483 City Public Service C. M. Canady C. Mele City of Austin City of Austin Electric Utility Department 721 Barton Springs Road Jon C. Wood Austin, TX 78704 Cox Smith Matthews Richard A. Ratliff Texas Department of State Health Services Alice Rogers Texas Department of State Health Services
Attachment NOC-AE-1 0002578 Page 1 of 8 SOUTH TEXAS PROJECT UNITS I AND 2 REQUEST FOR RELIEF FROM ASME SECTION XI CODE REQUIREMENTS FOR WELD EXAMINATIONS (RELIEF REQUEST RR-ENG-2-55)
Reference Code: ASME Boiler and Pressure Vessel Code, Section Xl 1989 Edition No Addenda A. Components for Which Exemption is Requested (a) Name and Identification Number: Component welds as listed in the attached tables.
(b) Function: Various (Refer to applicable sections of the South Texas Project Updated Final Safety Analysis Report for specifics)
(c) Class: ASME Code Class 1 or Class 2 as specified in the attached tables B. Code Requirement from Which Relief is Requested ASME Section XI Code Table IWB-2500-1 and Table IWC-2500-1 specify the examination method and extent of coverage for nondestructive examination of welds.
Relief from full volumetric or surface examination coverage requirements of the Section Xl Code is to be requested when the obtained coverage is 90% or less. The welds for which relief is requested are listed in the attached tables.
Welds with volumetric or surface examination coverage reduced less than 10% are considered to have essentially 100% coverage in accordance with ASME Section Xl Code Case N-460.
C. Basis for Relief from Code Requirements Obtaining required examination coverage of welds listed in the attached tables was found to be impractical due to various factors, including:
- Component configuration,
- Geometry, and
" Examination equipment and techniques utilized for the examinations.
STPNOC requests relief from full examination coverage requirements for the welds listed based on the impracticality of achieving required coverage.
D. Alternate Examination No alternate examinations are proposed for the welds for which relief is requested.
Attachment NOC-AE-1 0002578 Page 2 of 8 E. Justification for Granting Relief 100% examination coverage 6f these Welds is impractical because of component configuration and geometry, and because of the limitations of the examination equipment and techniques used to perform these examinations. However, volumetric and surface examinations of accessible locations will continue as required.
F. Implementation Schedule STPNOC requests that the Nuclear Regulatory Commission grant relief from the referenced nondestructive examination requirements pursuant to 10 CFR 50.55a(g)(6)(i). Approval of this application is requested by January 31, 2011.
Attachment NOC-AE-1 0002578 Page 3 of 8 WELD EXAMINATION COVERAGE - UNIT I ASME ASME ASME System Component Weld ID Component Coverage Limitation Exam Category Item No. Class Description Description Schedule B-A(D) B1.21 1 RC RPV- RPV1-102-151 BOTTOM HEAD 68%VOL BMI PENETRATION LOCATION 1RE15 CIRCUMFERENTIAL TORUS TO VESSEL WELDS BOTTOM HEAD DOME BEZ CIRC 2 MS PIPING - 1 EXTRUSION TO 75%VOL PIPING CONFIGURATION - PDI 1RE15 6-MS-1001-GA2(E) FLANGE BEZ CIRC 2 MS PIPING - 1 EXTRUSION TO 75%VOL PIPING CONFIGURATION - PDI 1RE15 6-MS-1002-GA2(E) FLANGE B-H B8.20 1 RC PRESSURIZER - PRZ-1-1A,1B SUPPORT 70%SUR PROXIMITY OF SUPPORT FRAME 1RE11 INTEGRAL BRACKET ATTACHMENTS B-H B8.20 1 RC PRESSURIZER - PRZ-1-2 SEISMIC LUG 75%SUR LUG CONFIGURATION 1RE14 INTEGRAL ATTACHMENTS B-H B8.20 1 RC PRESSURIZER - PRZ-1-3 SEISMIC LUG 75%SUR LUG CONFIGURATION 1RE14 INTEGRAL ATTACHMENTS B-H B8.20 1 RC PRESSURIZER - PRZ-1-4 SEISMIC LUG 75%SUR LUG CONFIGURATION 1RE14 INTEGRAL ATTACHMENTS C-A C1.10 2 RH HEATEXCHANGER- RHAHRS-1A-S2 SHELL TO 85%VOL FLANGE WELD CONFIGURATION 1RE11 CIRCUMFERENTIAL FLANGE WELDS C-B C2.21 2 RH HEAT EXCHANGER - RHAHRS-1A-NA NOZZLE TO 64%VOL NOZZLE WELD CONFIGURATION 1RE11 NOZZLE TO SHELL SHELL WELDS C-C C3.20 2 FW PIPING - 1PL1-LPL8 PIPE LUGS 60%SUR LUG CONFIGURATION 1RE11 18-FW-1 029-AA2 C-C C3.20 2 FW PIPING - 1PL1-LPL8 PIPE LUGS 60%SUR LUG CONFIGURATION IRE11 18-FW-1032-AA2
Attachment NOC-AE-1 0002578 C-C C3.20 2 MS PIPING - 27PL1-27PL8 PIPE LUGS 55%SUR LUG CONFIGURATION 1RE13 30-MS-1001-GA2 C-C C3.20 2 MS PIPING - 25PL1-25PL8 PIPE LUGS 55%SUR LUG CONFIGURATION IRE13 30-MS-1002-GA2 C-C C3.20 2 FW PIPING - 1PL1-IPL8 PIPE LUGS 50%SUR LUG CONFIGURATION 1RE15 18-FW-1031-AA2 C-C C3.20 2 MS PIPING - 26PL1-26PL8 PIPE LUGS 50%SUR LUG CONFIGURATION 1RE15 30-MS-1003-GA2 C-C C3.20 2 MS PIPING - 26PL1-26PL8 PIPE LUGS 50%SUR LUG CONFIGURATION 1RE15 30-MS-1004-GA2 C-C C3.30 2 RH PUMP 1A RHARHS-1A- INTEGRALLY 75%SUR PROXIMITY OF PUMP SUPPORT STANCHION. 1RE12 IWAl WELDED ATTACHMENT C-C C3.30 2 RH PUMP 1A RHARHS-1A- INTEGRALLY 75%SUR PROXIMITY OF PUMP SUPPORT STANCHION. 1RE12 IWA2 WELDED ATTACHMENT C-C C3.30 2 RH PUMP lA RHARHS-1A- INTEGRALLY 72%SUR WELDED ATTACHMENT CONFIGURATION 1RE14 IWA3 WELDED ATTACHMENT C-G C6.10 2 SI PUMP lA SIAPLH-1A- FLANGE TO 56%SUR FLOOR OBSTRUCTIONS. 1RE12 PCWl UPPER CASE N-722 B15.80 1 RC BOTTOM MOUNTED No. 41 BMI 48%VOL PROXIMITY OF BMI PENETRATION 48 1RE15 INSTRUMENTATION PENETRATION (BMI)
R-A-1 iRi.i1.i 1 RC PIPING - 1 VALVE TO PIPE 50%VOL VALVE CONFIGURATION- PDI EXAM 1RE13 8-RC-1214-BB1 R-A-1 lR1.11.2 1 RC PIPING - 11 PIPE TO 86%VOL FLANGE CONFIGURATION-PDI 1REll 6-RC-1012-NSS FLANGE
R-A-1 1R1.11.3 1 RC PIPING - 1 VALVE TO PIPE 79%VOL COVERAGE LIMITATION DUE TO SINGLE-SIDED 1RE15 12-RC-1322-BB1 EXAM - PDI R-A-1 IR1.15 1 RC PIPING - RSG-1A-IN-SE SAFE END TO 75% VOL DUE TO NOZZLE CONFIGURATION (TAPER) CIRC 1RE14 29-RC-1101-NSS - RSG INLET SCAN LIMITATION-PDI LOOP 1 NOZZLE R-A-1 1R1.15 1 RC PIPING - RSG-1D-IN-SE SAFE END TO 50%VOL DUE TO NOZZLE CONFIGURATION - PDI EXAM 1RE14 29-RC-1401-NSS - RSG INLET LOOP 4 NOZZLE R-A-1 1R2.11.3 1 RC PIPING - 2 PIPE TO 50%VOL VALVE-TO-PIPE CONFIGURATION - PDI EXAM 1RE14 2-RC-1003-BB1 REDUCER R-A-1 1R2.11.5 1 SI PIPING - 10 PIPE TO VALVE 50%VOL VALVE CONFIGURATION - PDI EXAM 1RE13 12-SI-1315-BB1 R-A-1 1R2.20 1 RC PIPING - 9 ELBOW TO 40%VOL CAST SS WELD CONFIGURATION AND SEARCH IREll 31-RC-1102-NSS - REACTOR UNIT SIZE LOOP 1 COOLANT PUMP 1A R-A-1 1R2.20 1 RC PIPING - 9 ELBOW TO 52%VOL LUG CONFIGURATION 1RE12 31-RC-1202-NSS - REACTOR LOOP 2 COOLANT PUMP 1B R-A-1 1R2.20 1 RC PIPING - 9 ELBOW TO 82%VOL WELD CONFIGURATION 1RE12 31-RC-1302-NSS - REACTOR LOOP 3 COOLANT PUMP iC
Attachment NOC-AE-1 0002578 Page 6 of 8 WELD EXAMINATION COVERAGE - UNIT 2 ASME ASME ASME System Component Weld ID Component Coverage Limitation Exam Category Item No. Class Description Description Schedule B-A B1.11 1 RC RPV- RPV2-101-141 LOWER SHELL TO 74%VOL CORE SUPPORT LUGS 2RE14 CIRCUMFERENTIAL BOTTOM HEAD VESSEL WELDS TORUS B-A B1.21 1 RC RPV- RPV2-102-151 BOTTOM HEAD 71%VOL BMI PENETRATIONS 2RE14 CIRCUMFERENTIAL TORUS TO VESSEL WELDS BOTTOM HEAD DOME B-B B2.40 1 RC RSG - HEAD WELDS RSG-2A-T1 CHANNEL HEAD 88%VOL STRUCTURAL STEEL 2RE13 TO TUBEPLATE B-D B3.110 1 RC PRESSURIZER - PRZ-2-N3 SAFETY NOZZLE 75%VOL NOZZLE WELD CONFIGURATION 2RE09 NOZZLE TO SHELL TO SHELL AND SHELL TO NOZZLE WELDS B-D B3.110 1 RC PRESSURIZER - PRZ-2-N4A RELIEF NOZZLE 78%VOL NOZZLE WELD CONFIGURATION 2RE09 NOZZLE TO SHELL TO SHELL AND SHELL TO NOZZLE WELDS B-D B3.110 1 RC PRESSURIZER - PRZ-2-N4B SAFETY NOZZLE 64%VOL NOZZLE WELD CONFIGURATION 2RE10 NOZZLE TO SHELL TO SHELL AND SHELL TO NOZZLE WELDS B-D B3.110 1 RC PRESSURIZER - PRZ-2-N4C SAFETY NOZZLE 61%VOL NOZZLE WELD CONFIGURATION 2RE10 NOZZLE TO SHELL TO SHELL AND SHELL TO NOZZLE WELDS B-H B8.20 1 RC PRESSURIZER - PRZ-2-1A,1B SUPPORT 70%SUR PROXIMITY OF SUPPORT FRAME. 2RE09 INTEGRAL BRACKET ATTACHMENTS B-H B8.20 1 RC PRESSURIZER - PZR-2-4A,4B SUPPORT 70%SUR PROXIMITY OF SUPPORT FRAME. 2RE09 INTEGRAL BRACKET ATTACHMENTS B-H B8.20 1 RC PRESSURIZER - PZR-2-2A,2B SUPPORT 70%SUR (2A) PROXIMITY OF SUPPORT FRAME 2RE10 INTEGRAL BRACKET 63%SUR(2B)
ATTACHMENTS
Attachment NOC-AE-1 0002578 B-H B8.20 1 RC PRESSURIZER - PRZ-2-3A,3B SUPPORT 70%SUR PROXIMITY OF SUPPORT FRAME 2RE10 INTEGRAL BRACKET ATTACHMENTS C-A C1.10 2 RH HEAT EXCHANGER - RHAHRS-2A-S2 SHELLTO 88%VOL FLANGE WELD CONFIGURATION. 2RE09 CIRCUMFERENTIAL FLANGE WELDS C-B C2.21 2 RH HEAT EXCHANGER - RHAHRS-2A-NA NOZZLE TO 66%VOL NOZZLE WELD CONFIGURATION 2RE09 NOZZLE TO SHELL SHELL WELDS C-B C2.21 2 RH HEAT EXCHANGER - RHAHRS-2A-NB NOZZLE TO 69%VOL NOZZLE WELD CONFIGURATION 2RE09 NOZZLE TO SHELL SHELL WELDS C-C C3.10 2 SG RSG- RSG-2A-TR-LS-A LOWER SHELL 50%SUR SUPPORT STRUCTURE. 2RE11 INTEGRAL TRUNNION A ATTACHMENTS C-C C3.20 2 MS PIPING - 29PL1-29PL8 PIPE LUGS 55%SUR LUG CONFIGURATION 2RE10 30-MS-2001-GA2 C-C C3.20 2 MS PIPING - 30PL1-30PL8 PIPE LUGS 55%SUR LUG CONFIGURATION 2RE10 30-MS-2002-GA2 C-C C3.20 2 MS PIPING - 29PL1-29PL8 PIPE LUGS 55%SUR LUG CONFIGURATION 2RE10 30-MS-2003-GA2 C-C C3.20 2 MS PIPING - 28PL1-28PL8 PIPE LUGS 55%SUR LUG CONFIGURATION 2RE1O 30-MS-2004-GA2 C-C C3.20 2 FW PIPING - 1PL1-IPL8 PIPE LUGS 51%SUR LUG CONFIGURATION 2RE11 18-FW-2030-AA2 C-C C3.20 2 FW PIPING - 1PLI-IPL8 PIPE LUGS 50%SUR LUG CONFIGURATION 2RE13 18-FW-2031-AA2 C-C C3.20 2 FW PIPING - 1PL1-IPL8 PIPE LUGS 50%SUR LUG CONFIGURATION 2RE13 18-FW-2032-AA2
Attachment NOC-AE-1 0002578 Paqe 8 of 8 WELD EXAMINATION COVERAGE - UNIT 2 ASME ASME ASME System Component Component coverage Limitation Exam Category Item No. Class Description Weld ID Description Schedule C-C C3.20 2 FW PIPING - 1PL1-1PL8 PIPE LUGS 51%SUR LUG CONFIGURATION 2RE14 18-FW-2029-AA2 C-C C3.30 2 RH PUMP 2A RHARHS-2A- INTEGRALLY 90%SUR PUMP SUPPORT LEG 2RE11 IWA2 WELDED ATTACHMENT C-G C6.10 2 CS PUMP 2A CIAPCS-2A- FLANGE TO 74%SUR FLOOR PENETRATIONS 2RE10 PCWl UPPER CASE C-G C6.10 2 SI PUMP 2A SIAPLH-2A- FLANGE TO 74%SUR FLOOR PENETRATIONS 2RE10 PCW1 UPPER CASE R-A-1 1R1.11.2 1 RC PIPING - 11 ELBOW TO 75%VOL FLANGE GEOMETRY -PDI 2RE11 6-RC-2012-NSS FLANGE R-A-1 1R1.15 1 RC PIPING - RSG-2A-IN-SE SAFE END TO RSG 50%VOL COVERAGE FROM THE SAFE-END ONLY DUE TO 2RE12 29-RC-2101-NSS - INLET NOZZLE THE NOZZLE CONFIGURATION LOOP 1 R-A-1 1R1.15 1 RC PIPING - RSG-2D-IN-SE SAFE END TO RSG 50%VOL COVERAGE FROM THE SAFE-END DUE TO 2RE12 29-RC-2401-NSS - INLET NOZZLE NOZZLE CONFIGURATION - PDI EXAM LOOP 4 R-A-1 1R2.11.5 1 SI PIPING - 9 PIPE TO VALVE 50%VOL CONFIGURATION - PDI EXAM 2RE10 12-SI-2315-BB1 R-A-1 1R2.20 1 RC PIPING - 9 ELBOW TO 42%VOL WELD CONFIGURATION AND SIZE OF SEARCH 2RE09 31-RC-2102-NSS - REACTOR UNIT REQUIRED FOR CAST SS MATERIAL.
LOOP 1 COOLANT PUMP R-A-1 1R2.20 1 RC PIPING - 9 ELBOW TO 45%VOL PIPING CONFIGURATION 2RE10 31-RC-2202-NSS - REACTOR LOOP 2 COOLANT PUMP R-A-1 1R2.20 1 RC PIPING - 9 ELBOW TO 50%VOL PIPING CONFIGURATION 2RE10 31-RC-2302-NSS - REACTOR LOOP 3 COOLANT PUMP