ML091390642
| ML091390642 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 05/18/2009 |
| From: | West R Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML091390642 (23) | |
Text
Tennessee Valley Authority, Post Office Box 2000, Decatur, Alabama 35609-2000 May 18, 2009 10 CFR 50.55a(a)(3)(i)
U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Stop: OWFN P1-35 Washington, D.C. 20555-0001 In the Matter of
)
Docket No. 50-260 Tennessee Valley Authority
)
BROWNS FERRY NUCLEAR PLANT (BFN) - UNIT 2 - AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) SECTION XI, INSERVICE INSPECTION (ISI)
PROGRAM - REQUEST FOR RELIEF 2-ISI-21, REVISION 1 - EXAMINATION OF PIPING WELD OVERLAYS In accordance with 10 CFR 50.55a(a)(3)(i), TVA is requesting relief from certain inservice inspection (ISI) requirements in Section XI of the ASME Section XI, Appendix VIII, Supplement 11 for BFN Unit 2. The specific requirements for which relief is requested relate to the qualification requirements for inspecting piping weld overlays using ultrasonic testing (UT). The enclosure to this letter contains BFN Unit 2 request for relief 2-ISI-21, Revision 1 for NRC review and approval. This request is the same request previously submitted by TVA and approved by NRC with the addition of one weld (RFW-2-018-001) to the scope.
ASME Section XI, Appendix VIII requirements are mandated and supplemented by 10 CFR 50.55a(b)(2)(xiv), (xv), and (xvi). Appendix VIII of ASME Section XI, 1995 Edition with 1996 Addenda is specified in the CFR. The BFN Unit 2 Inservice Inspection (ISI)
Program for nondestructive examination complies with the 1995 Edition, 1996 Addenda of ASME Section XI, and supplemented as required to incorporate ASME Section XI, Appendix VIII. TVA recently has been advised by the Electric Power Institute (EPRI), staff that prior to performing ultrasonic examination of Class 1 Reactor Coolant System (RCS) weld overlays (reference NRC GL 88-01, and Boiling Water Reactor Vessel and Internals Project (BWRVIP)-75), relief from ASME Section XI, Appendix VIII, Supplement 11 requirements is necessary. TVA was also informed that two options exist: (1) adopt ASME Code Case N-653, "Qualification Requirements for Full Structural Overlaid Wrought Austenitic Piping Welds,Section XI, Division 1," with some modifications, or, (2) use the EPRI Performance Demonstration Initiative (PDI) Program in lieu of the ASME Code Section XI, Appendix VIII, Supplement 11 requirements. EPRI has worked with the NRC staff to develop a sample request for relief, using option 2 above, to ensure sufficient information is submitted for NRC review.
U.S. Nuclear Regulatory Commission Page 2 May 18, 2009 The enclosure to this letter contains BFN Unit 2 request for relief 2-ISI-21, Revision 1 for NRC review and approval. The technical content of this request for relief is consistent with the EPRI sponsored PDI model including updates resulting from requests for additional information issued to other utilities (i.e., Southern Nuclear Operating Company (SNC), for Plant Hatch and Carolina Power and Light, for Brunswick Steam Electric Plant). Further, this request is consistent with BFN Unit 2 request for relief 2-ISI-21, Revision 0 submitted by TVA to NRC by letter dated June 30, 2003. NRC approved the request for relief by letter dated December 19, 2003 TVA requests approval of this request for relief by May 28, 2009, in order to support transition to Mode 2 (i.e., startup) for Cycle 16 operation.
There are no new regulatory commitments in this letter. If you have any questions, please contact F. R. Godwin at (256) 729-2636.
ince rely, R. G. West Site Vice President Enclosure cc (Enclosure):
(Via NRC Electronic Distribution)
Mr. Eugene F Guthrie, Branch Chief U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85 Atlanta, Georgia 30303-8931 NRC Resident Inspector Browns Ferry Nuclear Plant 10833 Shaw Road Athens, Alabama 35611-6970 Ms. Eva A. Brown, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North (MS 08G9) 11555 Rockville Pike Rockville, Maryland 20852-2739
ENCLOSURE TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT (BFN)
UNIT 2 AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) SECTION XI, INSERVICE INSPECTION (ISI) PROGRAM (THIRD TEN-YEAR INSPECTION INTERVAL)
REQUEST FOR RELIEF 2-ISI-21, REVISION 1 (SEE ATTACHED)
TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT (BFN)
UNIT 2 AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) SECTION XI, INSERVICE INSPECTION (ISI) PROGRAM (THIRD TEN-YEAR INSPECTION INTERVAL)
REQUEST FOR RELIEF 2-ISI-21, REVISION 1 Executive Summary:
In accordance with 10 CFR 50.55a(a)(3)(i), TVA is requesting relief from inservice inspection requirements of the 1995 Edition through 1996 Addenda of ASME Section XI, Appendix VIII, Supplement 11, "Qualification Requirements For Full Structural Overlaid Wrought Austenitic Piping Welds," of the ASME Boiler and Pressure Vessel-Code. The Performance Demonstration Initiative (PDI) Program for implementing the Supplement 11 qualification program for overlay welds is not in strict compliance with the requirements of Supplement 11 of the 1995 Edition through the 1996 Addenda. TVA proposes to use the PDI Program for implementation of Appendix VIII, Supplement 11 as amended in the attachment to this request for relief. The amendments to Supplement 11 as shown in Attachment A were coordinated with PDI, NRC, and Pacific Northwest National Laboratory (PNNL).
This request is the same request previously submitted by TVA (BFN Unit 2 request for relief 2-ISI-21, Revision 0) by letter dated June 30, 2003, with the addition of one weld (RFW-2-018-001) to the scope. This request was approved :by. NRC letter. dated December 19, 2003.
Unit: Two (2)
System(s): ASME Code Class 1 Systems with piping welds with structural weld overlays.
Refer to Listing Provided in Attachment B.
Components: Piping Welds with Structural Weld Overlay (See Attachment B for list)
ASME Code Class: ASME Code Class 1 ASME Section Xl Edition: 1995 Edition, 1996 Addenda Code Table: Westinghouse Owners Group (WOG) topical Report WCAP-14572, Revision 1-NP-A, Table 4.1-1 Examination Cateciory: R-A, Risk-Informed Piping Examinations Examination Item Number: R1.16, Elements Subject To Intergranular Stress Corrosion Cracking (IGSCC)
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Code Requirement: The 1995 Edition of ASME Section Xl, with addenda through 1996, WCAP-14572, Revision 1-NP-A, Table 4.1-1, Examination Category R-A, Item No. R1.16, requires a volumetric (UT) examination of the pipe weld including the overlay. The UT examination must be performed using personnel, procedures, and equipment qualified in accordance with Appendix VIII, Supplement 11.
Code Requirements From Which Relief Is Requested: Relief is requested from the requirement to qualify personnel, procedures, and equipment in accordance with Appendix VIII, Supplement 11 as stated in the 1995 Edition through the 1996 Addenda of the ASME Section XI Code.
List Of Items Associated With The Relief Request: ASME Code Class 1 Systems with piping welds with structural weld overlays. Refer to listing provided in Attachment B. This listing will be updated as weld overlays are installed.
Basis For Relief Request: The requirements of ASME Section XI, Appendix VIII, Supplement 11, as stated in the 1995 Edition through the 1996 Addenda are not practical to implement. The requirements were amended to improve the implementation process. The amended requirements are contained in the attachment to this relief request. The EPRI sponsored PDI amendments to Supplement 11, as shown in the attachment, were coordinated with PDI, NRC, and PNNL.
The proposed amended requirements of Supplement 11 for the qualification of personnel, procedures, and equipment will provide an alternative with an acceptable level of quality and safety.
Alternate Requirement: TVA proposes to utilize personnel, procedures, and equipment qualified in accordance with ASME section XI, Appendix VIII, Supplement 11, as amended by Attachment A of this enclosure, which is the EPRI administered PDI Program.
Justification For The Grantincq Of Relief: The proposed amended criteria (as shown in the Attachment A) to the requirements of the ASME Section XI, 1995 Edition with addenda through 1996, Appendix VIII, Supplement 11, which were coordinated through PDI, NRC, and PNNL, provides an alternative with an acceptable level of quality and safety.
NOTE: This request is consistent with BFN Unit 2 request for relief 2-ISI-21, Revision 0 submitted by TVA letter to NRC dated June 30, 2003. NRC approved the request for relief by letter dated December 19, 2003 (TAC No. MB9759).
Implementation Schedule: This request for relief is applicable to the BFN Unit 2, ASME Section XI Third Ten-Year ISI inspection interval (May 25, 2001 to May 24, 2011).
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Attachments:
Attachment A Table - Comparison of ASME Section XI, Appendix VIII, Supplement 11, Code Case N-653, and PDI Alternative Attachment B List of Components covered by this request for relief E-4
ATTACHMENT A 2-ISI-21, Revision 1 Comparison of ASME Section Xl,.*.
Appendix VIII, Supplement 11, Code Case N-653, and PDI Alternative E-5
SUPPLEMENT 11-QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 1.0 SPECIMEN REQUIREMENTS Qualification test specimens shall meet No Change No Change the requirements listed herein, unless a set of specimens is designed to accommodate specific limitations stated in the scope of the examination procedure (e.g., pipe size, weld joint configuration, access limitations). The same specimens may be used to demonstrate both detection and sizing qualification.
1.1 General. The specimen set shall No Change No Change conform to the following requirements.
(a) Specimens shall have sufficient No Change No Change volume to minimize spurious reflections that may interfere with the interpretation process..
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHTAUSTENITIC PIPING WELDS (b) The specimen set shall consist of at No Change (b) The specimen set shall consist of at least three specimens having different least three specimens having different nominal pipe diameters and overlay nominal pipe diameters and overlay thicknesses. They shall include the thicknesses. They shall include the minimum and maximum nominal pipe minimum and maximum nominal pipe diameters for which the examination diameters for which the examination procedure is applicable. Pipe diameters procedure is applicable. Pipe diameters within a range of 0.9 to 1.5 times a within a range of 0.9 to 1.5 times a nominal diameter shall be considered nominal diameter shall be considered equivalent. If the procedure is applicable equivalent. If the procedure is applicable to pipe diameters of 24 inches or larger, to pipe diameters of 24 inches or larger, the specimen set must include at least one the specimen set must include at least one specimen 24 inches or larger but need not specimen 24 inches or larger but need not include the maximum diameter. The include the maximum diameter.
specimen set must include at least one The specimen set shall include specimens specimen with overlay thickness within -
with overlays not thicker than 0.1 inches 0.1 inches to +0.25 inches of the more than the minimum thickness, nor maximum nominal overlay thickness for thinner than 0.25 inches of the maximum which the procedure is applicable.
nominal overlay thickness for which the examination procedure is applicable.
(c) The surface condition of at least two
.,No Change No Change specimens shall approximate the roughest surface condition for which the examination procedure is applicable.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS (d) Flaw Conditions (1) Base metal flaws. All flaws must be (1) Base metal flaws. All flaws must be in (1) Base metal flaws. All flaws must be in cracks in or near the butt weld heat-or near the butt weld heat-affected zone, or near the butt weld heat-affected zone, affected zone, open to the inside surface, open to the inside surface, and extending open to the inside surface, and extending and extending at least 75 percent through at least 75 percent through the base metal at least 75 percent through the base metal the base metal wall. Flaws may extend wall. Intentional overlay fabrication flaws wall. Intentional overlay fabrication flaws 100 percent through the base metal and shall not interfere with ultrasonic detection shall not interfere with ultrasonic detection into the overlay material; in this case, or characterization of the cracking.
or characterization of the base metal intentional overlay fabrication flaws shall Specimens containing IGSCC shall be flaws. Specimens containing IGSCC shall not interfere with ultrasonic detection or used when available, be used when available. At least 70 characterization of the cracking.
(a) At least 70 percent of the flaws in the percent of the flaws in the detection and Specimens containing IGSCC shall be detection and sizing tests shall be cracks.
sizing tests shall be cracks and the used when available.
Alternative flaw mechanisms, if used, shall remainder shall be alternative flaws.
provide crack-like reflective characteristics Alternative flaw mechanisms, if used, shall and shall be limited by the following:
provide crack-like reflective characteristics and shall be limited by the following:
(1) Flaws shall be limited to when implantation of cracks precludes obtaining (a) The use of Alternative flaws shall be a realistic ultrasonic response.
limited to when the implantation of cracks produces spurious reflectors that are (2) Flaws shall be semi-elliptical with a tip, uncharacteristic of actual flaws.
width of less' than or equal to 0.002 inches.
(b) Flaws shall be semi-elliptical with a tip width of less than or equal to 0.002 inches.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS (2) Oveday fabrication flaws. At least 40 No Change No Change percent of the flaws shall be non-crack fabrication flaws (e.g., sidewall lack of fusion or laminar lack of bond) in the overlay or the pipe-to-overlay interface. At least 20 percent of the flaws shall be cracks. The balance of the flaws shall be of either type.
(e) Detection Specimens (1) At least 20 percent but less than 40 (1) At least 20 percent but less than 40 (1) At least 20 percent but less than 40 percent of the flaws shall be oriented percent of the base metal flaws shall be percent of the base metal flaws shall be within +20 degrees of the pipe axial oriented within +20 degrees of the pipe oriented within +20 degrees of the pipe direction. The remainder shall be oriented axial direction. The remainder shall be axial direction. The remainder shall be circumferentially. Flaws shall not be open oriented circumferentially. Flaws shall not oriented circumferentially. Flaws shall not to any surface to which the candidate has be open to any surface to which the be open to any surface to which the physical or visual access. The rules of candidate has physical or visual access.
candidate has physical or visual access.
IWA-3300 shall be used to determine whether closely spaced flaws should be.
treated as single or multiple flaws.
(2) Specimens shall be divided into base (2) Specimens shall be divided into base (2) Specimens shall be divided into base and over-layrgrading units. Each metal and overlay fabrication grading metal and overlay fabrication grading
!specimen shall contain one or both types units. Each specimen shall contain one or units. Each specimen shall contain one or of grading units.
both types of grading units. Flaws Shall both types of grading units. Flaws shall not interfere with ultrasonic detection or not interfere with ultrasonic detection or characterization of other flaws.
characterization of other flaws.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS (a)(1) A base grading unit shall include at (a)(1) A base metal grading unit shall (a)(1)A base metal grading unit includes least 3 inches of the length of the overlaid include at least 1 inch of the length of the the overlay material and the outer 25 weld. The base grading unit includes the overlaid weld. The base metal grading percent of the original overlaid weld. The outer 25 percent of the overlaid weld and unit includes the outer 25 percent of the base metal grading unit shall extend base metal on both sides. The base overlaid weld and base metal on both circumferentially for at least 1 inch and grading unit shall not include the inner 75 sides. The base metal grading unit shall shall start at the weld centerline and be percent of the overlaid weld and base not include the inner 75 percent of the wide enough in the axial direction to metal overlay material, or base metal-to-overlaid weld and base metal overlay encompass one half of the original weld overlay interface, material, or base metal-to-overlay crown and a minimum of 0.50 inches of interface, the adjacent base material.
(a)(2) When base metal cracking (a)(2) When base metal cracking (a)(2) When base metal flaws penetrate penetrates into the overlay material, the penetrates into the overlay material, the into the overlay material, the base metal base grading unit shall include the overlay base metal grading unit shall not be used grading unit shall not be used as part of metal within 1 inch of the crack location, as.part of any overlay fabrication grading any overlay fabrication grading unit.
This portion of the overlay material shall unit.
not be used as part :of any overlay: grading unit. *_-_
(a)(3) When a base grading unit is (a)(3) Sufficient unflawed overlaid weld (a)(3) Sufficient unflawed overlaid weld designed to be unflawed, at least 1 inch of and base metal shall exist on all sides of and base metal shall exist on all sides of unflawed overlaid weld and base metal the grading unit to preclude interfering the grading unit to preclude interfering-,
shall exist on either side of the base reflections from~adjacent flaws.
reflections from adjacent flaws.
grading unit. The segment of weld length used in one base grading unit shall not be used in another base grading unit. Base grading units need not be uniformlyV spaced around the specimen.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS (b)(1) An overlay grading unit shall include (b)(1) An overlay fabrication grading unit (b)(l) An overlay fabrication grading unit the overlay material and the base metal-shall include the overlay material and the shall include the overlay material and the to-overlay interface of at least 6 square base metal-to-overlay interface for a base metal-to-overlay interface for a inches. The overlay grading unit shall be length of at least 1 inch length of at least 1 inch.
rectangular, with minimum dimensions of 2 inches.
(b)(2) An overlay grading unit designed to (b)(2) Overlay fabrication grading units (b)(2) Overlay fabrication grading units be unflawed shall be surrounded by designed to be unflawed shall be designed to be unflawed shall be unflawed overlay material and unflawed separated by unflawed overlay material separated by unflawed overlay material base metal-to-overlay interface for at least and unflawed base metal-to-overlay and unflawed base metal-to-overlay 1 inch around its entire perimeter. The interface for at least 1 inch at both ends.
interface for at least 1 inch at both ends.
specific area used in one overlay grading Sufficient unflawed overlaid weld and Sufficient unflawed overlaid weld and unit shall not be used in another overlay base metal shall exist on both sides of the base metal shall exist on both sides of the grading unit. Overlay grading units need overlay fabrication grading unit to preclude overlay fabrication grading unit to preclude not be spaced uniformly about the interfering reflections from adjacent flaws.
interfering reflections from adjacent flaws.
specimen.
The specific area used in one overlay The specific area used in one overlay fabrication grading unit shall not be used fabrication grading unit shall not be used in another overlay fabrication grading unit.,
in another overlay fabrication grading unit.
Overlay fabrication grading units need not,' Overlay fabrication grading units need not be spaced uniformly about the specimen.
be spaced uniformly about the specimen.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS (b)(3) Detection sets shall be selected (b)(3) Detection sets shall be selected (b)(3) Detection sets shall be selected from Table VIII-S2-1. The minimum from Table VIII-S2-1. The minimum from Table VIII-S2-1. The minimum detection sample set is five flawed base detection sample set is five flawed base detection sample set is five flawed base grading units, ten unflawed base grading metal grading units, ten' unflawed base metal grading units, ten unflawed base units, five flawed overlay grading units, metal grading units, five flawed overlay metal grading units, five flawed overlay and ten unflawed overlay-grading units, fabrication grading units, and ten unflawed fabrication grading units, and ten unflawed For each type of grading unit, the set shall overlay fabrication grading units. For each overlay fabrication grading units. For each contain at least twice as many unflawed type of grading unit, the set shall contain type of grading unit, the set shall contain as flawed grading units.
at least twice as many unflawed as flawed at least twice as many unflawed as flawed grading units. For initial procedure grading units. For initial procedure qualification, detection sets shall include qualification, detection sets shall include the equivalent of three personnel the equivalent of three personnel qualification sets. To qualify new values qualification sets. To qualify new values of essential variables, at least one of essential variables, at least one personnel qualification set is required.
personnel qualification set is required.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS (0 Sizing Specimen (1) The minimum number of flaws shall be (1) The minimum number of flaws shall be (1) The minimum number of flaws shall be ten. At least 30 percent of the flaws shall ten. At least 30 percent of the flaws shall ten. At least 30 percent of the flaws shall be overlay fabrication flaws. At least be overlay fabrication flaws. At least be overlay fabrication flaws. At least 40 percent of the flaws shall be cracks 40 percent of the flaws shall be cracks 40 percent of the flaws shall be open to open to the inside surface, open to the inside surface. For initial the inside surface. Sizing sets shall procedure qualification, sizing sets shall contain a distribution of flaw dimensions to include the equivalent of three personnel assess sizing capabilities. For initial qualification sets. To qualify new values procedure qualification, sizing sets shall of essential variables, at least one include the equivalent of three personnel personnel qualification set is required.
qualification sets. To qualify new values of essential variables, at least one personnel qualification set is required.
(2) At least,20 percent but less than No Change No Change 40 percent of the flaws shall be oriented axially. The remainder shall be oriented circumferentially. Flaws shall not be open to any surface to which the candidate has physical or visual access.
(3) Base metal cracking used for length No Change (3) Base metal flaws used for length sizing sizing demonstrations shall be oriented demonstrations shall be oriented circumferentially.
circumferentially.
(4) Depth -sizing specimen sets shall No Change (4) Depth sizing specimen sets shall include at least two distinct locations include at least two distinct locations where cracking in the base metalextends where a base metal flaw extends into the into the overlay material by at least 0*1 overlay material by at least 0.1 inch in the inch in the through-wall direction.
through-wall direction.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 2.0 CONDUCT OF PERFORMANCE DEMONSTRATION The specimen inside surface and The specimen inside surface and The specimen inside surface and identification shall be concealed from the identification shall be concealed from the identification shall be concealed from the candidate. All examinations shall be candidate. All examinations shall be candidate. All examinations shall be completed prior to grading the results and completed prior to grading the results and completed prior to grading the results and presenting the results to the candidate.
presenting the results to the candidate.
presenting the results to the candidate.
Divulgence of particular specimen results Divulgence of particular specimen results Divulgence of particular specimen results or candidate viewing of unmasked or candidate viewing of unmasked or candidate viewing of unmasked specimens after the performance specimens after the performance specimens after the performance demonstration is prohibited.
demonstration is prohibited. The overlay demonstration is prohibited. The overlay fabrication flaw test and the base metal fabrication flaw test and the base metal flaw test may be performed separately.
flaw test may be performed separately.
2.1 Detection Test.
Flawed and unflawed grading units shall Flawed and unflawed grading units shall Flawed and unflawed grading units shall be randomly mixed. Although the be randomly mixed. Although the be randomly mixed. Although the boundaries of specific grading units shall boundaries of specific grading units shall boundaries of specific grading units shall not be revealed to the candidate, the not be revealed to the candidate, :the not be revealed to the candidate, the candidate shall be made aware of the type candidate shall be made aware'.of the type candidate shall be made aware of the type or types of grading units (base or overlay) or types of grading units (base metal or or types of grading units (base metal or that are present for each specimen.
overlay fabrication) that are present for overlay fabrication) that are present for each specimen.
each specimen.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 2.2 Length Sizing Test (a) The length sizing test may be No Change No Change conducted separately or in conjunction with the detection test.
(b) When the length sizing test is No Change No Change conducted in conjunction with the detection test and the detected flaws do not satisfy the requirements of 1. 1(0, additional specimens shall'be provided to the candidate. The regions containing a flaw to be sized shall be identified to the candidate. The candidate shall determine the length of the flaw in each region.
(c) For.a separate length sizing test, the No Change No Change regions of each specimen containing a flaw to be sized shall be identified to the candidate. The candidate shall determine the length of the flaw in each region.
.(d) For flaws inbase grading units, the (d) For flaws in base metal grading units, (d) For flaws in base metal grading units, candidate shall estimate the length of that the candidate shall estimate the length. of the candidate shall estimate the length of part of the flaw that is in the outer that partof the flaw that is in the outer that part of the flaw that is in the outer 25 percent of the base wall thickness.
25 percent of the base metal wall 25 percent of the base metal wall thickness.
thickness.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 2.3 Depth Sizing Test For the depth sizing test, 80 percent of the The candidate shall determine the depth (a) The depth sizing test may be flaws shall be sized at a specific location of the flaw in each region.
conducted separately or in conjunction on the surface of the specimen identified with the detection test.
to the candidate. For the remaining flaws, the regions of each specimen containing a flaw to be sized shall be identified to the candidate. The candidate shall determine the maximum depth of the flaw in each region.
(b) When the depth sizing test is conducted in conjunction with the detection test and the detected flaws do not satisfy the requirements of 1. 1(f),
additional specimens shall be provided to the candidate. The regions containing a flaw to be sized shall be identified to the candidate. The candidate shall determine the maximum depth of the flaw in each region.
(c) For a separate depth sizing test, the regions of each specimen containing a flaw to be sized shall be identified to the candidate. The candidate shall determine the maximum depth of the flaw in each region.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 3.0 ACCEPTANCE CRITERIA 3.1 Detection Acceptance Criteria.
Examination procedures, equipment, and Examination procedures are qualified for (a) Examination procedures are qualified personnel are qualified for detection when detection when all flaws within the scope for detection when:
the results of the performance of the procedure are detected and the demonstration satisfy the acceptance results of the performance demonstration criteria of Table VIII-S2-1 for both satisfy the acceptance criteria of Table detection and false calls. The criteria shall VIII-S2-1 for false calls. Examination be satisfied separately by the equipment and personnel are qualified for demonstration results for base grading detection when the results of the units and for overlay grading units.
performance demonstration satisfy the acceptance criteria of Table VIII-S2-1 for both detection and false calls. The criteria shall be satisfied separately by the demonstration results for base metal grading units and for overlay fabrication grading units.
(1) All flaws within the scope of the procedure are detected and the results of the performance demonstration satisfy the acceptance criteria of Table VIII-S2-1 for false calls.
(2) At least one successful personnel demonstration has been performed meeting the acceptance criteria defined in (b).
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS (b) Examination equipment and personnel are qualified for detection when the results of the performance demonstration satisfy the acceptance criteria of Table VIII-S2-1 for both detection and false calls.
(c) The criteria in (a), (b) shall be satisfied separately by the demonstration results for base metal grading units and for overlay fabrication grading units.
3.2 Sizing Acceptance Criteria Examination procedures, equipment, and No Change No Change personnel are qualified for sizing when the results of the performance demonstration satisfy the following criteria.
(a)-The RMS error of the flaw length No Change (a) The RMS error of the flaw length measurements, as compared to the true measurements, as compared to the true flaw.lengths, is less than or equal to 0.75 flaw lengths; is less than or equal to 0.75 inches. The length of base metal cracking inches. The length of basemetal flaws is is m*asured at the 75 percent:through-measured at the 75 percent through-base-base -metal position.
metal position.
(b)All extensions of base metal cracking This requirement is omitted.
This requirement is omitted.
into the overlay material by at: least 0.1 inches are reported as being intrusions into the overlay material.
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SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only)
Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS (c) The RMS error of the flaw depth (b) The RMS error of the flaw depth (b) The RMS error of the flaw depth measurements, as compared to the true measurements, as compared to the true measurements, as compared to the true flaw depths, is less than or equal to 0.125 flaw depths, is less than or equal to 0.125 flaw depths, is less than or equal to 0.125 inches.
inches.
inch.
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ATTACHMENT B 2-ISI-21, Revision I List of Components Associated With This Request For Relief E-20
Attachment B 2-1SI-21, Revision 1 List of Components Associated With This Request For Relief BFN Unit 2 Weld Overlays in the Risk-Informed ISI Program that require examination:
WELD No.
SYSTEM' PIPE SIZE (inches)
CATEGORY GR-2-15*
Recirculation 12.0 E
DSRWC-2-03*
- RWCU, 6.0 E
DSRWC-2-04*
RWCU 6.0 E
DSRWC-2-05*
RWCU 6.0 E
Weld Overlays in the BFN Unit 2 Risk-Informed ISI Program that currently do not require examination:
WELD No.
SYSTEM PIPE SIZE (inches)
CATEGORY TCS-2-421*
Core Spray 12.0 E
GR-2-45*
Recirculation 12.0 E
GR-2-59*
Recirculation
- 28:0.0.:.,!
" E GR-2-61*
Recirculation 28.0 E
GR-2-64*
Recirculation 28.0 E
RFW-2-018-001**
Feedwater 2.0 N/A (N12A Nozzle)
- Welds previously approved in BFN Request for Relief 2-ISI-21 Revision 0, submitted by TVA letter dated June 30, 2003. This request for relief (RevisionO0) was approved byNRC SER dated December 19, 2003.
"*This Weld is submitted with this request for relief (2-ISI-21, Revision 1), for NRC approval E-21