ML022050130
| ML022050130 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 07/16/2002 |
| From: | O'Neil E Carolina Power & Light Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML022050130 (20) | |
Text
SCP&L A Progress Energy Company JUL 16 2002 10 CFR 50.55a(a)(3)(i)
SERIAL: BSEP 02-0119 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-325 AND 50-324/LICENSE NOS. DPR-71 AND DPR-62 REQUEST FOR APPROVAL OF RELIEF REQUEST FOR THE THIRD 10-YEAR INSERVICE INSPECTION PROGRAM - INSPECTION OF PIPING WELD OVERLAYS Ladies and Gentlemen:
In accordance with 10 CFR 50.55a(a)(3)(i), Carolina Power & Light (CP&L) Company is requesting relief from certain requirements of the American Society of Mechanical Engineers (ASME)Section XI, Appendix VIII, Supplement 11 for the Brunswick Steam Electric Plant (BSEP), Unit Nos. 1 and 2. The specific requirements for which relief is requested relate to the qualification requirements for inspecting piping weld overlays using ultrasonic testing (UT). The technical justification for the relief request is provided in.
The Inservice Inspection (ISI) Program for BSEP, Units 1 and 2, was developed to comply with the 1989 Edition of the ASME Code,Section XI, and has been supplemented as required to incorporate the requirements of the ASME Code,Section XI, Appendix VIII.
As prescribed by 10 CFR 50.55a(g)(4)(i), these ISI requirements are subject to the limitations of 10 CFR 50.55a(b). The requirements of the ASME Code,Section XI, Appendix VIII, regarding the qualifications of personnel performing UT, are mandated and supplemented by 10 CFR 50.55a(b)(2)(xiv), (xv) and (xvi). 10 CFR 50.55a(b)(2)(xv) specifies that the requirements of Appendix VIII of the ASME Code,Section XI, 1995 Edition with 1996 Addenda, must be used.
CP&L has been advised by the Electric Power Research Institute (EPRI) staff that, prior to performing UT of Class 1 reactor coolant system (RCS) weld overlays (i.e., for examinations specified by NRC Generic Letter 88-01, "NRC Position on IGSCC in BWR Austenitic Stainless Steel Piping"), relief from the requirements of the ASME Code,Section XI, Appendix VIII, Supplement 11 is necessary. CP&L 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 Brunswick Nuclear Plant P.O Box 10429 Southport, NC 28461
Document Control Desk BSEP 02-0119 / Page 2 requirements. EPRI has worked cooperatively with an NRC staff member, Mr. Don Naujock, to develop a sample request for relief, using Option 2 above, to ensure sufficient information is submitted to support NRC review of each licensee's relief request.
In accordance with 10 CFR 50.55a(a)(3)(i), CP&L is requesting relief from the ASME Code,Section XI requirements and proposes to use, as an alternative, the EPRI PDI Program for implementation of ASME Code,Section XI, Appendix VIII, Supplement 11 requirements. The enclosed request for relief for BSEP, Units 1 and 2, has been prepared using the EPRI model relief request guidance previously discussed. The technical content of the BSEP-specific request for relief is equivalent to the EPRI model. Enclosure 2 provides a comparison of the differences between the ASME Code,Section XI, Appendix VIII, Supplement 11; ASME Code Case N-653; and the PDI Program for weld overlay examinations. This additional information is provided to assist in NRC review of the BSEP-specific relief request.
Please refer any questions regarding this submittal to Mr. Leonard R. Beller, Supervisor Licensing/Regulatory Programs, at (910) 457--2073.
Sincerely, Edward T. O'Neil Manager - Regulatory Affairs Brunswick Steam Electric Plant WRM/wrm
Enclosures:
- 1. Relief Request RR-31
- 2. Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program
Document Control Desk BSEP 02-0119 / Page 3 cc (with enclosures):
U. S. Nuclear Regulatory Commission, Region II ATTN: Mr. Luis A. Reyes, Regional Administrator Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85 Atlanta, GA 30303-8931 U. S. Nuclear Regulatory Commission ATTN: Mr. Theodore A. Easlick, NRC Senior Resident Inspector 8470 River Road Southport, NC 28461-8869 U. S. Nuclear Regulatory Commission (Electronic Copy Only)
ATI'N: Ms. Brenda L. Mozafari (Mail Stop OWFN 8G9) 11555 Rockville Pike Rockville, MD 20852-2738 Ms. Jo A. Sanford Chair - North Carolina Utilities Commission P.O. Box 29510 Raleigh, NC 27626-05 10 Division of Boiler and Pressure Vessel North Carolina Department of Labor ATTN: Mr. Jack Given, Assistant Director of Boiler & Pressure Vessels 4 West Edenton Street Raleigh, NC 27601-1092
BSEP 02-0119 Page 1 of 4 ENCLOSURE 1 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-325 AND 50-324/LICENSE NOS. DPR-71 AND DPR-62 REQUEST FOR APPROVAL OF RELIEF REQUEST FOR THE THIRD 10-YEAR INSERVICE INSPECTION PROGRAM - INSPECTION OF PIPING WELD OVERLAYS Relief Request RR-31 SystemJComponent for Which Relief is Requested:
Class 1, Pressure Retaining Welds in Piping, subject to American Society of Mechanical Engineer (ASME) Code,Section XI, Appendix VIII, Supplement 11 examination (i.e., weld overlay examinations).
ASME Code Requirement:
The requirements for which relief is requested are specified in the ASME Code,Section XI, Appendix VIII, Supplement 11. The specific references are provided as follows:
Paragraph 1.1(b) requires -0.1 to+0.25 inch thickness tolerance for specimen overlays.
Paragraph 1. l(d)(1), requires that all base metal flaws be cracks.
Paragraph 1.1(e)(1) requires that at least 20% but less than 40% of the flaws shall be oriented within +/- 200 of the pipe axial direction.
Paragraph 1.1(e)(1) also requires that the rules of IWA-3300 shall be used to determine whether closely spaced flaws should be treated as single or multiple flaws.
Paragraph 1.1 (e)(2)(a)(l) requires that a base grading unit shall include at least 3 inches of the length of the overlaid weld.
Paragraph 1.1(e)(2)(a)(2) requires the use of cracking in specimen overlay material.
Paragraph 1.1(e)(2)(b)(l) requires that an overlay grading unit shall include the overlay material and the base metal-to-overlay interface of at least 6 square inches.
The overlay grading unit shall be rectangular, with minimum dimensions of 2 inches.
Paragraph 1.1 (e)(2)(b)(2) requires unflawed areas to be surrounded by unflawed interface material around the perimeter.
BSEP 02-0119 Page 2 of 4 Paragraphs 1.1(f)(1), 1.1(f)(3), and 1.1(f)(4) requires the use of actual cracks.
Paragraph 3.2(b) requires that all extensions of base metal cracking into the overlay material by at least 0.1 inch are reported as being intrusions into the overlay material.
Code Requirement for Which Relief is Requested:
In accordance with 10 CFR 50.55a(a)(3)(i), Carolina Power & Light (CP&L) Company is requesting relief from the ASME Code,Section XI requirements and proposes to use, as an alternative, the Electric Power Research Institute (EPRI) Performance Demonstration Initiative (PDI) Program for implementation of ASME Code,Section XI, Appendix VIII, Supplement 11 requirements.
Basis for Relief:
The ASME Code,Section XI, Appendix VIII, Supplement 11, paragraph 1. 1(d)(1) requires that base metal flaws be cracks. As illustrated below, implanting a crack requires excavation of the base material on at least one side of the flaw.
4k-----*
Mechanical fatigue crack While this may be satisfactory for ferritic materials, it does not produce a useable axial flaw in austenitic materials because the sound beam, which normally passes only through base material, must now travel through weld material on at least one side, producing an unrealistic flaw response. To resolve this issue, the EPRI PDI Program revised this paragraph to allow use of alternative flaw mechanisms under controlled conditions. For example, alternative flaws shall be limited to cases where implantation of cracks precludes obtaining an effective ultrasonic response, flaws shall be semi elliptical with a tip width of less than or equal to 0.002 inches, and at least 70 percent of the flaws in the detection and sizing test shall be cracks and the remainder shall be alternative flaws.
Relief is requested to allow closer spacing of flaws provided they do not interfere with detection or discrimination. The existing specimens used, to date, for qualification to the Tri-party (i.e.,
NRC/Boiling Water Reactor Owners' Group/EPRI) agreement have a flaw population density greater than allowed by the current ASME Code requirements. These samples have been used successfully for the previous qualifications under the Tri..party agreement program. To facilitate their use and provide continuity from the Tri-party agreement program to Supplement 11, the PDI Program has merged the Tri-party test specimens into their weld overlay program. For example:
BSEP 02-0119 Page 3 of 4
"* The requirement for using the ASME Code,Section XI, IWA-3300 for proximity flaw evaluation in paragraph 1.1 (e)(1) was excluded, instead indications will be sized based on their individual merits.
"* Paragraph 1.1(d)(1) includes the statement that intentional overlay fabrication flaws shall not interfere with ultrasonic detection or characterization of the base metal flaws.
"* Paragraph 1.1 (e)(2) was modified to add the requirement that installed flaws shall not interfere with detection/characterization of other flaws.
"* Paragraph 1. 1(e)(2)(a)(1) was modified to require that a base metal grading unit include at least 1 inch of the length of the overlaid weld, rather than 3 inches.
"* Paragraph 1.1(e)(2)(a)(2) was reworded zo c:larify the extent of overlay grading units.
Paragraph 1. 1(e)(2)(a)(3) was modified to require sufficient unflawed overlaid weld and base metal to exist on all sides of the grading unit to preclude interfering reflections from adjacent flaws, rather than the 1 inch requirement of Supplement 11.
Paragraph 1.1 (e)(2)(b)(1) was modified to define an overlay fabrication grading unit as including the overlay material and the base metal-to-overlay interface for a length of at least 1 inch, rather than the 6 square inch requirement of Supplement 11.
"* Paragraph 1.1 (e)(2)(b)(2) states that overlay fabrication grading units designed to be unflawed shall be separated by unfiawed overlay material and unflawed base metal-to overlay interface for at least 1 inch at both ends, rather than around its entire perimeter.
"* Paragraphs 1.1(e)(2)(b)(3) and 1.1(f)(1) were modified to clarify procedure qualification requirements.
"* Words were added to paragraph 2.0 to clarify test administration requirements.
"* Paragraph 3.0 was reworded to clarify differences between procedure demonstration versus equipment/personnel qualification.
Additionally, the requirement for axially oriented overlay fabrication flaws in paragraph 1.1(e)(1) was excluded from the PDI Program as an improbable scenario. Weld overlays are typically applied using automated gas tungsten arc welding techniques with the filler metal being applied in a circumferential direction. Because resultant fabrication induced discontinuities would also be expected to have major dimensions oriented in the circumferential direction, axial overlay fabrication flaws are unrealistic.
The requirement in paragraph 3.2(b) for reporting all extensions of cracking into the overlay is omitted from the PDI Program because it is redundant to the Root Mean Square (RMS) calculations performed in paragraph 3.2(c) and it's presence adds confusion and ambiguity to
BSEP 02-0119 Page 4 of 4 depth sizing as required by paragraph 3.2(c). This also makes the weld overlay program consistent with the ASME Code,Section XI, Supplement 2, Qualification Requirements for Wrought Austenitic Piping Welds, depth sizing criteria.
The EPRI PDI has submitted these changes, and obtained approval, as ASME Code Case N-653, "Qualification Requirements for Full Structural Overlaid Wrought Austenitic Piping Welds,Section XI, Division 1." ASMIE Code Case N-653 was approved September 7, 2001. A detailed comparison matrix between Supplement 11, the ASME Code,Section XI Code Case N-653, and the PDI Program is provided in Enclosure 2 as supporting documentation. The first column identifies the current requirements in the 1995.Edition and 1996 Addenda of the ASME Code,Section XI, Supplement 11, while the second (i.e., middle) column identifies the changes made by the Code Case.
There are, however, some additional changes -hat were inavcr.i.y omitte,2 from the Code Case. The most important change is paragraph.A(e)(2)()), where the phrase "and base metal on both sides," was inadvertently included il the descfnPtioi-. of a base metal grading unit. The PDI Program intentionally excludes this requirement because some of the qualification samples include flaws on both sides of the weld. To avoid confusion., several instances of the term "cracks" or "cracking" were changed to the term "flaws" because of the use of alternative flaw mechanisms. Additionally, to avoid confusion, the overlay thickness tolerance contained in the last sentence of paragraph 2. 1(b), was reworded and the phrase "and the remainder shall be alternative flaws" was added to the next to last sentence in paragraph 1.1(d)(1). These changes are identified by bold print in the third column of the enclosure.
Alternate Examination:
In lieu of the requirements of the ASMIE Code,Section XI, 1995 Edition, 1996 Addenda, Appendix VIII, Supplement 11, the EPRI PDI Program shall be used.
Justification for Granting Relief:
In accordance with 10 CFR 50.55a(a)(3)(i), CP&L requests approval to use the EPRI PDI Program, as described above, in lieu of the ASME Code,Section XI, Appendix VIII, Supplement 11 requirements. Compliance with the PDI Program will provide an adequate level of quality and safety for examination of the affected welds (i.e., weld overlay repairs). EPRI and the NRC have worked closely to reach agreement on the criteria related to the subject examination requirements and both parties have agreed that the PDI Program is an acceptable alternative to the ASME Code,Section XI, Appendix VIII, Supplement 11.
Implementation Schedule:
The relief request is applicable to the third 10-Year ISI interval.
ENCLOSURE 2 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-325 AND 50-324/LICENSE NOS. DPR-71 AND DPR-62 REQUEST FOR APPROVAL OF RELIEF REQUEST FOR THE THIRD 10-YEAR INSERVICE INSPECTION PROGRAM - INSPECTION OF PIPING WELD OVERLAYS Comparison of the ASME Code,Section XI, Supplement 1!
to ASME Code Case N-653 and the EPRI PDI Program
BSEP 02-0119 Page 1 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program 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 No Change No Change volume to minimize spurious reflections that may interfere with the interpretation process.
(b) The specimen set shall consist of at No Change (b) The specimen set shall consist of at least least three specimens having different three specimens having different nominal nominal pipe diameters and overlay pipe diameters and overlay thicknesses.
thicknesses. They shall include the They shall include the minimum and minimum and maximum nominal pipe I maximum nominal pipe diameters for which
BSEP 02-0119 Page 2 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program diameters for which the examination the examination procedure is applicable.
procedure is applicable. Pipe diameters Pipe diameters within a range of 0.9 to within a range of 0.9 to 1.5 times a 1.5 times a nominal diameter shall be nominal diameter shall be considered considered equivalent. If the procedure is equivalent. If the procedure is applicable applicable to pipe diameters of 24 inch or to pipe diameters of 24 inch or larger, the larger, the specimen set must include at least specimen set must include at least one one specimen 24 inch or larger but need not specimen 24 inch or larger but need not include the maximum diameter. The include the maximum diameter. The specimen set shall include specimens with specimen set must include at least one overlay thickness within +0.1 inch of the specimen with overlay thickness within minimum nominal overlay thickness and
-0.1 inch to +0.25 inch of the maximum within -0.25 inch of the maximum nominal nominal overlay thickness for which the overlay thickness for which the procedure procedure is applicable.
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.
(d) Flaw Conditions (1) Base metalflaws. All flaws must be (1) Base metal flaws. All flaws must be in or (1) Base metal flaws All flaws must be in or cracks in or near the butt weld heat-near the butt weld heat-affected zone, open near the butt weld heat-affected zone, open affected zone, open to the inside surface, to the inside surface, and extending at least to the inside surface, and extending at least
BSEP 02-0119 Page 3 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program and extending at least 75% through the 75% through the base metal wall.
75% through the base metal wall.
base metal wall. Flaws may extend 100%
Intentional overlay fabrication flaws shall Intentional overlay fabrication flaws shall through the base metal and into the not interfere with ultrasonic detection or not interfere with ultrasonic detection or overlay material; in this case, intentional characterization of the cracking. Specimens characterization of the base metal flaws.
overlay fabrication flaws shall not containing IGSCC shall be used when Specimens containing IGSCC shall be used interfere with ultrasonic detection or available. At least 70% of the flaws in the when available. At least 70% of the flaws in characterization of the cracking.
detection and sizing tests shall be cracks.
the detection and sizing tests shall be cracks Specimens containing IGSCC shall be Alternative flaw mechanisms, if used, shall and the remainder shall be alternative used when available, provide crack-like reflective characteristics flaws. Alternative flaw mechanisms, if used, and shall be limited by the following:
shall provide crack-like reflective (a) Flaws shall be limited to when characteristics and shall be limited by the implantation of cracks precludes obtaining a following:
realistic ultrasonic response.
(a) Flaws shall be limited to when (b) Flaws shall be semielliptical with a tip implantation of cracks precludes obtaining width of less than or equal to 0.002 inches.
an effective ultrasonic response.
(b) Flaws shall be semielliptical with a tip width of less than or equal to 0.002 inches.
(2) Overlay fabrication flaws. At least No Change No Change 40% 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.
I
BSEP 02-0119 Page 4 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration "Supplement 11 ASME Code Case N-653 Initiative Program At least 20% of the flaws shall be cracks.
The balance of the flaws shall be of either type.
(e) Detection Specimens (1) At least 20% but less than 40% of the (1) At least 20% but less than 40% of the (1) At least 20% but less than 40% of the flaws shall be oriented within +20 degrees base metal flaws shall be oriented within base metal flaws shall be oriented within of the pipe axial direction. The remainder
+20 degrees of the pipe axial direction. The
+20 degrees of the pipe axial direction. The shall be oriented circumferentially. Flaws remainder shall be oriented remainder shall be oriented shall not be open to any surface to which circumferentially. Flaws shall not be open to circumferentially. Flaws shall not be open to the candidate has physical or visual any surface to which the candidate has any surface to which the candidate has access. The rules of IWA-3300 shall be physical or visual access.
physical or visual access.
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 metal and overlay fabrication grading units.
metal and overlay fabrication grading units.
specimen shall contain one or both types Each specimen shall contain one or both Each specimen shall contain one or both of grading 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 characterization of other flaws.
characterization of other flaws.
(a)(1) A base grading unit shall include at (a)(1) A base metal grading unit shall (a)(1) A base metal grading unit shall least 3 inch of the length of the overlaid include at least 1 inch of the length of the include at least 1 inch of the length of the
BSEP 02-0119 Page 5 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program weld. The base grading unit includes the overlaid weld. The base metal grading unit overlaid weld. The base metal grading unit outer 25% of the overlaid weld and base includes the outer 25% of the overlaid weld includes the outer 25% of the overlaid weld.
metal on both sides. The base grading unit and base metal on both sides. The base The base metal grading unit shall not include shall not include the inner 75% of the metal grading unit shall not include the inner the inner 75% of the overlaid weld and base overlaid weld and base metal overlay 75% of the overlaid weld and base metal metal overlay material, or base metal-to material, or base metal-to-overlay overlay material, or base metal-to-overlay overlay interface.
interface, interface.
(a)(2) When base metal cracking (a)(2) When base metal cracking penetrates (a)(2) When base metal flaws penetrate into penetrates into the overlay material, the into the overlay material, the base metal the overlay material, the base metal grading base grading unit shall include the overlay grading unit shall not be used as part of any unit shall not be used as part of any overlay metal within 1 inch of the crack location, overlay fabrication grading unit.
fabrication grading unit.
This portion of the overlay material shall not be used as part of any overlay grading unit.
(a)(3) When a base grading unit is designed to be unflawed, at least 1 inch of unflawed overlaid weld and base metal shall exist on either side of the base 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 (a)(3) Sufficient unflawed overlaid weld and base metal shall exist on all sides of the grading unit to preclude interfering reflections from adjacent flaws.
(a)(3) Sufficient unflawed overlaid weld and base metal shall exist on all sides of the grading unit to preclude interfering reflections from adjacent flaws.
BSEP 02-0119 Page 6 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program spaced around the specimen.
(b)(1) An overlay grading unit shall (b)(1) An overlay fabrication grading unit (b)(1) An overlay fabrication grading unit include 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 base metal-to-overlay interface for a length base metal-to-overlay interface for a length 6 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 one adjacent flaws. The specific area used in one specimen.
overlay fabrication grading unit shall not be overlay fabrication grading unit shall not be used in another overlay fabrication grading used in another overlay fabrication grading unit. Overlay fabrication grading units need unit. Overlay fabrication grading units need not be spaced uniformly about the specimen.
not be spaced uniformly about the specimen.
(b)(3) Detection sets shall be selected (b)(3) Detection sets shall be selected from (b)(3) Detection sets shall be selected from from Table VIII-S2-1. The minimum Table VIII-S2-1. The minimum detection Table VIII-S2-1. The minimum detection
BSEP 02-0119 Page 7 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program detection sample set is five flawed base sample set is five flawed base metal grading sample set is five flawed base metal grading grading units, ten unflawed base grading units, ten unflawed base metal grading units, units, ten unflawed base metal grading units, units, five flawed overlay grading units, five flawed overlay fabrication grading units, five flawed overlay fabrication grading units, and ten unflawed overlay grading units.
and ten unflawed overlay fabrication grading and ten unflawed overlay fabrication grading For each type of grading unit, the set shall units. For each type of grading unit, the set units. For each type of grading unit, the set contain at least twice as many unflawed as shall contain at least twice as many unflawed shall contain at least twice as many unflawed flawed grading units, as flawed grading units. For initial as flawed grading units. For initial procedure qualification, detection sets shall procedure qualification, detection sets shall include the equivalent of three personnel include the equivalent of three personnel qualification sets. To qualify new values of qualification sets. To qualify new values of essential variables, at least one personnel essential variables, at least one personnel qualification set is required.
qualification set is required.
(f) Sizing Specimen (1) The minimum number of flaws shall (1) The minimum number of flaws shall be (1) The minimum number of flaws shall be be ten. At least 30% of the flaws shall be ten. At least 30% of the flaws shall be ten. At least 30% of the flaws shall be overlay fabrication flaws. At least 40% of overlay fabrication flaws. At least 40% of overlay fabrication flaws. At least 40% of the flaws shall be cracks open to the inside the flaws shall be cracks open to the inside the flaws shall be open to the inside surface.
surface.
surface. For initial procedure qualification, For initial procedure qualification, sizing sets sizing sets shall include the equivalent of shall include the equivalent of three three personnel qualification sets. To qualify personnel qualification sets. To qualify new new values of essential variables, at least one values of essential variables, at least one personnel qualification set is required.
personnel qualification set is required.
BSEP 02-0119 Page 8 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program (2) At least 20% but less than 40% of the No Change No Change 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 include at least two distinct locations at least two distinct locations where flaws in where cracking in the base metal extends the base metal extend into the overlay into the overlay material by at least material by at least 0.1 inch in the through 0.1 inch in the through-wall direction.
wall direction.
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 or Divulgence of particular specimen results or
BSEP 02-0119 Page 9 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program or candidate viewing of unmasked candidate viewing of unmasked specimens candidate viewing of unmasked specimens specimens after the performance after the performance demonstration is after the performance demonstration is demonstration is prohibited.
prohibited. The overlay fabrication flaw test prohibited. The overlay fabrication flaw test and the base metal flaw test may be and the base metal flaw test may be performed separately.
performed separately.
2.1 Detection Test Flawed and unflawed grading units shall Flawed and unflawed grading units shall be Flawed and unflawed grading units shall be be randomly mixed. Although the randomly mixed. Although the boundaries randomly mixed. Although the boundaries boundaries of specific grading units shall of specific grading units shall not be revealed of specific grading units shall not be revealed not be revealed to the candidate, the to the candidate, the candidate shall be made to the candidate, the candidate shall be made candidate shall be made aware of the type aware of the type or types of grading units aware of the type or types of grading units or types of grading units (base or overlay)
(base metal or overlay fabrication) that are (base metal or overlay fabrication) that are that are present for each specimen.
present for each specimen.
present for each specimen.
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),
BSEP 02-0119 Page 10 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program 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 in base grading units, the (d) For flaws in base metal grading units, the (d) For flaws in base metal grading units, the candidate shall estimate the length of that candidate shall estimate the length of that candidate shall estimate the length of that part of the flaw that is in the outer 25% of part of the flaw that is in the outer 25% of part of the flaw that is in the outer 25% of the base wall thickness.
the base metal wall thickness.
the base metal wall thickness.
2.3 Depth Sizing Test For the depth sizing test, 80% of the flaws The candidate shall determine the depth of The candidate shall determine the depth of shall be sized at a specific location on the the flaw in each region.
the flaw in each region.
surface of the specimen identified 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
BSEP 02-0119 Page 11 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program the maximum depth of the flaw in each region.
3.0 ACCEPTANCE CRITERIA 3.1 Detection Acceptance Criteria Examination procedures, equipment, and Examination procedures are qualified for Examination procedures are qualified for personnel are qualified for detection when detection when all flaws within the scope of detection when all flaws within the scope of the results of the performance the procedure are detected and the results of the procedure are detected and the results of demonstration satisfy the acceptance the performance demonstration satisfy the the performance demonstration satisfy the criteria of Table VIII-S2-1 for both acceptance criteria of Table VIII-S2-1 for acceptance criteria of Table VIII-S2-1 for detection and false calls. The criteria shall false calls. Examination equipment and false calls. Examination equipment and be satisfied separately by the personnel are qualified for detection when personnel are qualified for detection when demonstration results for base grading the results of the performance demonstration the results of the performance demonstration units and for overlay grading units.
satisfy the acceptance criteria of satisfy the acceptance criteria of Table VIII-S2-1 for both detection and false Table VIII-S2-1 for both detection and false calls. The criteria shall be satisfied calls. The criteria shall be satisfied separately by the demonstration results for separately by the demonstration results for base metal grading units and for overlay base metal grading units and for overlay fabrication grading units, fabrication grading units.
3.2 Sizing Acceptance Criteria Examination procedures, equipment, and No Change No Change personnel are qualified for sizing when the
BSEP 02-0119 Page 12 of 12 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program American Society of Mechanical Engineers (ASME) Code,Section XI, Performance Demonstration Supplement 11 ASME Code Case N-653 Initiative Program 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 flaw lengths, is less than or equal to lengths, is less than or equal to 0.75 inch.
0.75 inch. The length of base metal The length of base metal flaws is measured cracking is measured at the 75% through-at the 75% through-base-metal position.
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 inch are reported as being intrusions into the overlay material.
(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 flaw measurements, as compared to the true flaw flaw depths, is less than or equal to depths, is less than or equal to 0.125 inch.
depths, is less than or equal to 0.125 inch.
0.125 inch.