ML083400030
| ML083400030 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 11/25/2008 |
| From: | Brandon M Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 1-ISI-21 | |
| Download: ML083400030 (20) | |
Text
Tennessee Valley Authority, Post Office Box 2000, Decatur, Alabama 35609-2000 November 25, 2008 10 CFR 50.55a 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. 50-259 Tennessee Valley Authority
)
BROWNS FERRY NUCLEAR PLANT (BFN) - UNIT I - AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) SECTION XI, INSERVICE INSPECTION PROGRAM FOR THE SECOND TEN-YEAR INSPECTION INTERVAL - REQUEST FOR RELIEF 1-ISI-21 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 1. 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 1, request for relief I-ISI-21, for NRC review and approval.
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 Xl, 2001 Edition with 2003 Addenda is specified in the CFR. The BFN Unit I Inservice Inspection (ISI)
Program for nondestructive examination complies with the 2001 Edition, 2003 Addenda of ASME Section XI, and supplemented as required to incorporate ASME Section XI, Appendix VIII.
Aw 17
U.S. Nuclear Regulatory Commission Page 2 November 25, 2008 TVA proposes to use the EPRI Performance Demonstration Initiative (PDI) Program in lieu of the ASME Code Section XI, Appendix VIII, Supplement 11 requirements. This request for relief is consistent with the one approved for BFN Unit 3 by NRC letter dated August 22, 2006.
TVA requests approval of this request for relief by 0900 CST on November 27, 2008, in order to support transition to Mode 2 (i.e. startup) for Cycle 8 operation.
There are no new regulatory commitments in this letter. If you have any questions, please contact me at (256) 729-2636.
Sincerely, CYA\\
Michael K. Brandon Interim Manager of Licensing and Industry Affairs Enclosure cc: See Page 3
U.S. Nuclear Regulatory Commission Page 3 November 25, 2008 cc (Enclosure):
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
TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT (BFN)
UNIT 1 AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) SECTION XI, INSERVICE INSPECTION (ISI) PROGRAM (SECOND TEN YEAR INSPECTION INTERVAL)
REQUEST FOR RELIEF 1-ISI-21 Executive Summary: In accordance with 10 CFR 50.55a(a)(3)(i), TVA is requesting relief from inservice inspection requirements of the 2001 Edition through 2003 Addenda of 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 implementation of the Supplement 11 qualification program for overlay welds is NOT in strict compliance with the requirements of Supplement 11 of the 2001 Edition through the 2003 Addenda. TVA proposes to use the PDI Program for implementation of Appendix VIII, Supplement 11 as amended in attachment to this request for relief. The amendments to Supplement 11 as shown in attachment were coordinated with PDI, NRC, and Pacific Northwest National Laboratory (PNNL).
Unit: One (1)
System(s): Reactor Feedwater (FW)
Components: Piping Welds with Structural Weld Overlay ASME Code Class: ASME Code Class 1 Section XI Edition: 2001 Edition, 2003 Addenda, as amended by 10 CFR 50.55a(b)(2)(xxiv)
Code Table: N/A Examination Category: N/A Examination Item Number: N/A Code Requirement: The 2001 Edition of ASME Section Xl, as amended by 10 CFR 50.55a(b)(2)(xxiv). 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 2001 Edition of ASME Section Xl, as amended by 10 CFR 50.55a(b)(2)(xxiv).
List Of Items Associated With The Relief Request: Weld Overlays that currently require examination in the Unit 1 ISI Program as required by Code Case N-504-3 and Appendix Q.
WELD #
SYSTEM PIPE SIZE CATEGORY N-11B-1 OL FW 2 inches N/A Note 1: Safe End: 0.206 inches min wall thickness as specified on drawing 122868E. Overlay: 0.13 minimum design thickness as specified for structural integrity in DCN 69535.
Basis For Relief: The requirements of ASME Section Xl, Appendix VIII, Supplement 11, as stated in the 2001 Edition, as amended by 10 CFR 50.55a(b)(2)(xxiv), 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 the Attachment, which is the EPRI administered PDI Program.
Justification For The Granting Of Relief: The proposed amended criteria (as shown in the attachment) to the requirements of the ASME Section Xl, 2001 Edition as amended by 10 CFR 50.55a(b)(2)(xxiv), 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 for relief (RFR) is consistent with one submitted by Brunswick Steam Electric Plant to the NRC by letters dated July 16, 2002 and February 11, 2003. The NRC approved the request for relief by letter dated March 26, 2003. 3-ISI-17 request for relief for the BFN Unit 3 Third Interval was approved by letter dated August 22, 2006. 2-ISI-21 request for relief for BFN Unit 2 Third Interval was approved by letter dated December 19, 2003.
Implementation Schedule: This request for relief is applicable to the Unit 1 Second Ten-Year ISI inspection interval which expires on June 1, 2017. Preservice and Inservice inspection of weld overlay N-i 1 B-1 (OL) will be conducted in accordance with Code Case N-504-3 and Nonmandatory Appendix Q.
Attachment:
Table - Comparison of ASME Section XI, Appendix VIII, Supplement 11, Code Case N-653, and PDI Alternative.
1-ISI-21, Attachment Comparison of ASME Section X1, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL (Provided for Information Only)
The Proposed Alternative to Supplement STRUCTURAL OVERLAID WROUGHT 11 Requirements AUSTENETIC PIPING WELDS 1.0 SPECIMEN REQUIREMENTS Qualification test specimens shall meet the No Change No Change 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 volume No Change No Change to minimize spurious reflections that may interfere with the interpretation process.
1-ISI-21, Attachment Comparison of ASME Section Xl, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative (b) The specimen set shall consist of at least three specimens having different nominal pipe diameters and overlay thicknesses. They shall include the minimum and maximum nominal pipe diameters for which the examination procedure is applicable. Pipe diameters within a range of 0.9 to 1.5 times a nominal diameter shall be considered equivalent. If the procedure is applicable to pipe diameters of 24 inches or larger, the specimen set must include at least one specimen 24 inches or larger but need NOT include the maximum diameter. The specimen set must include at least one specimen with overlay thickness within
-0.1 inches to +0.25 inches of the maximum nominal overlay thickness for which the procedure is applicable.
No Change (b) The specimen set shall consist of at least three specimens having different nominal pipe diameters and overlay thicknesses. They shall include the minimum and maximum nominal pipe diameters for which the examination procedure is applicable. Pipe diameters within a range of 0.9 to 1.5 times a nominal diameter shall be considered equivalent. If the procedure is applicable to pipe diameters of 24 inches or larger, the specimen set must include at least one specimen 24 inches or larger but need NOT include the maximum diameter.
The specimen set shall include specimens with overlays NOT thicker than 0.1 inches more than the minimum thickness, nor thinner than 0.25 inches of the maximum 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.
1-ISI-21, Attachment Comparison of ASME Section Xl, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative (d) Flaw Conditions 1-(1) Base metal flaws. All flaws must be cracks in or near the butt weld heat-affected zone, open to the inside surface, and extending at least 75 percent through the base metal wall. Flaws may extend 100 percent through the base metal and into the overlay material; in this case, intentional overlay fabrication flaws shall NOT interfere with ultrasonic detection or characterization of the cracking.
Specimens containing IGSCC shall be used when available.
(1) Base metal flaws. All flaws must be in or near the butt weld heat-affected zone, open to the inside surface, and extending at least 75 percent through the base metal wall. Intentional overlay fabrication flaws shall NOT interfere with ultrasonic detection or characterization of the cracking.
Specimens containing IGSCC shall be used when available. At least 70 percent of the flaws in the detection and sizing tests shall be cracks. Alternative flaw mechanisms, if used, shall 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 realistic ultrasonic response.
(2) Flaws shall be semi-elliptical with a tip width of less than or equal to 0.002 inches.
(1) Base metal flaws. All flaws must be in or near the butt weld heat-affected zone, open to the inside surface, and extending at least 75 percent through the base metal wall. Intentional overlay fabrication flaws shall NOT interfere with ultrasonic detection or characterization of the base metal flaws.
Specimens containing IGSCC shall be used when available. At least 70 percent of the flaws in the detection and sizing tests shall be cracks and the remainder shall be alternative flaws. Alternative flaw mechanisms, if used, shall provide crack-like reflective characteristics and shall be limited by the following:
(a) The use of Alternative flaws shall be limited to when the implantation of cracks produces spurious reflectors that are uncharacteristic of actual flaws.
(b) Flaws shall be semi-elliptical with a tip width of less than or equal to 0.002 inches.
1-ISI-21, Attachment Comparison of ASME Section XI, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative (2) Overlay fabrication flaws. At least No Change No Change 40 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 (1) At least 20 percent but less than (1) At least 20 percent but less than 40 percent of the flaws shall be oriented 40 percent of the base metal flaws shall be 40 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-lay grading units. Each specimen metal and overlay fabrication grading units.
metal and overlay fabrication grading units.
shall contain one or both types of grading Each specimen shall contain one or both Each specimen shall contain one or both units.
types of grading units. Flaws shall NOT types of grading units. Flaws shall NOT interfere with ultrasonic detection or interfere with ultrasonic detection or charac-trization of other flaws.,
.-- terizat-ion of other flaws.
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1 -ISI-21, Attachment Comparison of ASME Section Xl, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative (a)(1) A base grading unit shall include at least 3 inches of the length of the overlaid weld. The base grading unit includes the outer 25 percent of the overlaid weld and base metal on both sides. The base grading unit shall NOT include the inner 75 percent of the overlaid weld and base metal overlay material, or base metal-to-overlay interface.
(a)(1) A base metal grading unit shall include at least 1 inch of the length of the overlaid weld. The base metal grading unit includes the outer 25 percent of the overlaid weld and base metal on both sides. The base metal grading unit shall NOT include the inner 75 percent of the overlaid weld and base metal overlay material, or base metal-to-overlay interface.
(a)(1) The base metal grading unit includes the overlay material and the outer 25 percent of the original overlaid weld.
The base metal grading unit shall extend circumferentially for at least 1 inch and shall start at the weld centerline and be wide enough in the axial direction to encompass one half of the original weld crown and a minimum of 0.50" of 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 and (a)(3) Sufficient unflawed overlaid weld and designed to be unflawed, at least 1 inch of base metal shall exist on all sides of the base metal shall exist on all sides of the unflawed overlaid weld and base metal grading unit to preclude interfering 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 uniformly spaced around the S,,ei.imen.
1-ISI-21, Attachment Comparison of ASME Section Xl, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative (b)(I) An overlay grading unit shall include (b)(1) An overlay fabrication grading unit (b)(1) An overlay fabrication grading unit the overlay material and the base shall include the overlay material and the shall include the overlay material and the metal-to-overlay interface of at least 6 base metal-to-overlay interface for a length base metal-to-overlay interface for a length square inches. The overlay grading unit of at least 1 inch.
of at least 1 inch.
shall be 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 separated designed to be unflawed shall be separated unflawed overlay material and unflawed by unflawed overlay material and unflawed by unflawed overlay material and unflawed base metal-to-overlay interface for at least base metal-to-overlay interface for at least base metal-to-overlay interface for at least 1 inch around its entire perimeter. The 1 inch at both ends. Sufficient unflawed 1 inch at both ends. Sufficient unflawed specific area used in one overlay grading overlaid weld and base metal shall exist on overlaid weld and base metal shall exist on unit shall NOT be used in another overlay both sides of the overlay fabrication grading both sides of the overlay fabrication grading grading unit. Overlay grading units need unit to preclude interfering reflections from unit to preclude interfering reflections from NOT be spaced uniformly about the adjacent flaws. The specific area used in adjacent flaws. The specific area used in specimen.
one overlay fabrication grading unit shall one overlay fabrication grading unit shall NOT be used in another overlay fabrication NOT be used in another overlay fabrication grading unit. Overlay fabrication grading grading unit. Overlay fabrication grading units need NOT be spaced uniformly about units need NOT be spaced uniformly about the specimen.
the specimen.
1-ISI-21, Attachment Comparison of ASME Section XI, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative (b)(3) Detection sets shall be selected from Table VIII-$2-1. The minimum detection sample set is five flawed base grading units, ten unflawed base grading units, five flawed overlay grading units, and ten unflawed overlay grading units. For each type of grading unit, the set shall contain at least twice as many unflawed as flawed grading units.
(b)(3) Detection sets shall be selected from Table VIII-S2-1. The minimum detection sample set is five flawed base metal grading units, ten unflawed base metal grading units, five flawed overlay fabrication grading units, and ten unflawed overlay fabrication grading units. For each type of grading unit, the set shall contain at least twice as many unflawed as flawed grading units. For initial procedure qualification, detection sets shall include the equivalent of three personnel qualification sets. To qualify new values of essential variables, at least one personnel qualification set is required.
(b)(3) Detection sets shall be selected from Table VIII-S2-1. The minimum detection sample set is five flawed base metal grading units, ten unflawed base metal grading units, five flawed overlay fabrication grading units, and ten unflawed overlay fabrication grading units. For each type of grading unit, the set shall contain at least twice as many unflawed as flawed grading units. For initial procedure qualification, detection sets shall include the equivalent of three personnel qualification sets. To qualify new values of essential variables, at least one personnel qualification set is required.
I 4.
(f) Sizing Specimen (1) The minimum number of flaws shall be ten. At least 30 percent of the flaws shall be overlay fabrication flaws. At least 40 percent of the flaws shall be cracks open to the inside surface.
(1) The minimum number of flaws shall be ten. At least 30 percent of the flaws shall be overlay fabrication flaws. At least 40 percent of the flaws shall be cracks open to the inside surface. For initial procedure qualification, sizing sets shall include the equivalent of three personnel qualification sets. To qualify new values of essential variables, at least one personnel qualification set is re',quird^.
(1) The minimum number of flaws shall be ten. At least 30 percent of the flaws shall be overlay fabrication flaws. At least 40 percent of the flaws shall be open to the inside surface. Sizing sets shall contain a distribution of flaw dimensions to assess sizing capabilities. For initial procedure qualification, sizing sets shall include the equivalent of three personnel qualification sets. To qualify new values of essential variables, at least one personnel qualification set is required.
1 -ISI-21, Attachment Comparison of ASME Section XI, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative (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 where include at least two distinct locations where cracking in the base metal extends into the a base metal flaw extends into the overlay overlay material by at least 0.1 inches in material by at least 0.1 inches in the the through-wall direction.
through-wall direction.
1-ISI-21, Attachment Comparison of ASME Section Xl, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative 1~
2.0 CONDUCT OF PERFORMANCE DEMONSTRATION 1~
The specimen inside surface and identification shall be concealed from the candidate. All examinations shall be completed prior to grading the results and presenting the results to the candidate.
Divulgence of particular specimen results or candidate viewing of unmasked specimens after the performance demonstration is prohibited.
The specimen inside surface and identification shall be concealed from the candidate. All examinations shall be completed prior to grading the results and presenting the results to the candidate.
Divulgence of particular specimen results or candidate viewing of unmasked specimens after the performance demonstration is prohibited. The overlay fabrication flaw test and the base metal flaw test may be performed separately.
The specimen inside surface and identification shall be concealed from the candidate. All examinations shall be completed prior to grading the results and presenting the results to the candidate.
Divulgence of particular specimen results or candidate viewing of unmasked specimens after the performance demonstration is prohibited. The overlay fabrication flaw test and the base metal flaw test may be performed separately.
1~
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2.1 Detection Test.
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Flawed and unflawed grading units shall be randomly mixed. Although the boundaries of specific grading units shall NOT be revealed to the candidate, the candidate shall be made aware of the type or types of grading units (base or overlay) that are present for each specimen.
Flawed and unflawed grading units shall be randomly mixed. Although the boundaries of specific grading units shall NOT be revealed to the candidate, the candidate shall be made aware of the type or types of grading units (base metal or overlay fabrication) that are present for each specimen.
Flawed and unflawed grading units shall be randomly mixed. Although the boundaries of specific grading units shall NOT be revealed to the candidate, the candidate shall be made aware of the type or types of grading units (base metal or overlay fabrication) that are present for each specimen.
A.
1 -ISI-21, Attachment Comparison of ASME Section Xl, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative I
- 1*
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(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 length of the flaw in each region.
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 in base 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 part of 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.
1 -ISI-21, Attachment Comparison of ASME Section XI, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative 2.3 Depth Sizing Test.
1 For the depth sizing test, 80 percent of the The candidate shall determine the depth of (a) The depth sizing test may be conducted flaws shall be sized at a specific location on the flaw in each region.
separately or in conjunction with the the surface of the specimen identified to the detection test.
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.
1-ISI-21, Attachment Comparison of ASME Section Xl, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative 3.0 ACCEPTANCE CRITERIA
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3.1 Detection Acceptance Criteria.
I 4.
Examination procedures, 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. The criteria shall be satisfied separately by the demonstration results for base grading units and for overlay grading units.
Examination procedures are qualified for detection when all flaws within the scope of the procedure are detected and the results of the performance demonstration satisfy the acceptance criteria of Table VIllI-S2-1 for false calls. 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. The criteria shall be satisfied separately by the demonstration results for base metal grading units and for overlay fabrication grading units.
(a) Examination procedures are qualified for detection when:
1*
- 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.
4 1
(2) At least one successful personnel demonstration has been performed meeting the acceptance criteria defined in (b).
1-ISI-21, Attachment Comparison of ASME Section Xl, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative (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 flaw lengths, is less than or equal to 0.75 inches. The length of base metal 0.75 inches. The length of base metal cracking is measured at the 75 percent flaws is measured at the 75 percent through-base-metal position.
through-base-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.
1-ISI-21, Attachment Comparison of ASME Section Xl, Appendix VIII, Supplement 11, Code Case N 653, and PDI Alternative (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 flaw depths, is less than or equal to flaw depths, is less than or equal to 0.125 inches.
0.125 inches.
0.125 inches.
,1