SVP-02-001, Request for Code Relief, Examination of Pressure Retaining Welds in Piping Subject to Appendix Viii, Supplement 11, Examination
| ML020440545 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 01/04/2002 |
| From: | Tulon T Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| CR-37, SVP-02-001 | |
| Download: ML020440545 (16) | |
Text
Exel nm Fxelon Generation Company. LLC www.exeloncorp.com Nuclear Ouad Cities Nuclear Power Station 22710 206' Avenue North Cordova, IL 61242-9740 January 4, 2002 SVP-02-001 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington. DC 20555 Quad Cities Nuclear Power Station, Units 1 and 2 Facility Operating License Nos. DPR-29 and DPR-30 NRC Docket Nos. 50-254 and 50-265 Subject Relief Request CR-37, Inservice Inspection Program Relief Regarding Examination of Pressure Retaining Welds in Piping Subject to Appendix VIII, Supplement 11, Examination Quad Cities Nuclear Power Station (QCNPS) is submitting Relief Request CR-37 to utilize the Performance Demonstration Initiative (PDI) for implementation of American Society of Mechanical Engineers (ASME) Section Xl 1995 Edition, 1996 Addenda, Appendix VIII, Supplement 11 requirements.
Relief is being requested in accordance with 10 CFR 50.55a(a)(3)(i) on the basis that the proposed alternative will provide an acceptable level of quality and safety. The proposed relief request is provided as an attachment to this letter.
On November 22, 2001, 10 CFR 50.55a required weld overlay examinations to meet ASME Section XI 1995 Edition, 1996 Addenda, Appendix VIII, Supplement 11 requirements. At a November 26-30, 2001, EPRI Steering Committee Meeting & PDI Steering Committee Meeting, utilities were notified that the PDI alternatives to the Appendix VIII examination requirements had not received NRC approval as an acceptable alternative. It was recognized, at this time, that QCNPS has to inspect nine weld overlays during Q2R16, an expedited relief was required. As a result, discussions were held with PDI and the NRC to establish generic relief information. The attached Relief Request CR-37, represents the efforts for generic relief permitting PDI techniques as an alternative to Appendix VIII, Supplement 11 requirements.
Expedited approval of the attached relief is requested. The relief request is needed for Q2R16, which is currently scheduled to commence on February 12, 2002.
Should you have any questions concerning his letter, please contact Wally Beck at (309) 227-2800.
Respectfully, Ti thy J. Tulon Site Vice President Quad Cities Nuclear Power Station cc: Regional Administrator - NRC Region III NRC Senior Resident Inspector - Quad Cities Nuclear Power Station
RELIEF REQUEST NUMBER: CR-37 REVISION 0 (Page 1 of 4)
COMPONENT IDENTIFICATION Code Class: 1
Reference:
ASME Section XI, 1995 Edition with 1996 Addenda, Appendix VIII, Supplement I1,"Qualification Requirements For Full Structural Overlaid Wrought Austenitic Piping Welds" Examination Category: B-J Item Numrne:. B9.11'
==
Description:==
Pressure Retaining Welds in Piping, subject to Appendix VIII, Supplement 11, ,"Qualification Requirements For Full Structural Overlaid Wrought Austenitic Piping Welds" NOTE: Also Identified in NRC Generic Letter 88-01 as Category E Component Numbers: Weld Overlay Components subject to Ultrasonic Examination CODE REQUIREMENT The Code requirements for which relief is requested are all contained within Appendix VIII, Supplement 11. For example, paragraph 1.1 (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 +20 degrees of the pipe axial direction. Paragraph 1.1(e)(1) also requires that the rules of or IWA-3300 shall be used to determine whether closely spaced flaws should be treated as single multiple flaws. Paragraph 1.1 (e)(2)(a)(1) requires that a base grading unit shall include at least 3 in. of the length of the overlaid weld. Paragraph 1.1 (e)(2)(b)(1) requires that a overlay grading unit shall include the overlay material and the base metal-to-overlay interface of at least 6 sq. in.
The overlay grading unit shall be rectangular, with minimum dimensions of 2 in. Paragraph 3.2(b) requires that all extensions of base metal cracking into the overlay material by at least 0.1 in. are reported as being intrusions into the overlay material.
CODE REQUIREMENT FROM WHICH RELIEF IS REQUESTED Specific Code relief requirements for which relief is requested are identified in the right hand column of Attachment A entitled, "PDI Program, The Proposed Alternative to Supplement 11 Requirements".
RELIEF REQUEST NUMBER: CR-37 REVISION 0 (Page 2 of 4)
BASIS FOR RELIEF Initiative Pursuant to 10 CFR 50.55a(a)(3)(i) relief is requested to use the Performance Demonstration that on the basis (PDI) Program for implementation of Appendix VIII, Supplement 11 requirements safety.
the proposed alternative will provide an acceptable level of quality and illustrated below, implanting Paragraph 1.1 (d)(1), requires that all base metal flaws be cracks. As.
flaw. While this may be a crack requires excavation of the base material on at least one side of the flaw in austenitic materials satisfactory for ferritic materials, it does not produce a useable axial must now travel because the sound beam, which normally passes only through base material, flaw response. To resolve this through weld material on at least one side, producing an unrealistic flaw mechanisms under issue, the PDI program revised this paragraph to allow use of alternative to when implantation of controlled conditions. For example, alternative flaws shall be limited semielliptical with a tip cracks precludes obtaining an effective ultrasonic response, flaws shall be flaws in the detection and width of less than or equal to 0.002 inches, and at least 70 percent of the sizing test shall be cracks and the remainder shall be alternative flaws.
Mechanical fatigue crack in Base material interfere with detection or Relief is requested to allow closer spacing of flaws provided they didn't Tri-party discrimination. The existing specimens used to date for qualification to the than allowed by the (NRC/BWROG/EPRI) agreement have a flaw population density greater for all previous current Code requirements. These samples have been used successfully their use and provide qualifications under the Tri-party agreement program. To facilitate Program has merged continuity from the Tri-party agreement program to Supplement 11, the PDI the requirement for the Tri-party test specimens into their weld overlay program. For example:
excluded, instead using IWA-3300 for proximity flaw evaluation in paragraph 1.1 (e)(1) was (d)(1) includes the indications will be sized based on their individual merits; paragraph 1.1 with ultrasonic detection or statement that intentional overlay fabrication flaws shall not interfere was modified to require that a characterization of the base metal flaws; paragraph 1.1(e)(2)(a)(1) weld, rather than 3 base metal grading unit include at least 1 in. of the length of the overlaid overlaid weld and inches; paragraph 1. (e)(2)(a)(3) was modified to require sufficient unflawed reflections from adjacent base metal to exist on all sides of the grading unit to preclude interfering 1.1 (e)(2)(b)(1) was flaws, rather than the 1 inch requirement of Supplement 11; paragraph overlay material and the modified to define an overlay fabrication grading unit as including the the 6 sq. in. requirement of base metal-to-overlay interface for a length of at least 1 in, rather than grading units Supplement 11; and paragraph 1.1 (e)(2)(b)(2) states that overlay fabrication
RELIEF REQUEST NUMBER: CR-37 REVISION 0 (Page 3 of 4)
BASIS FOR RELIEF (CONT'D) designed to be unflawed shall be separated by unflawed overlay material and unflawed base metal to-overlay interface for at least 1 in. at both ends, rather than around its entire perimeter.
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 11wsav unrealistic.
The PDI Program revised paragraph 2.0 to permit the overlay fabrication flaw test and the base metal flaw tests be performed separately.
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 RMS calculations performed in paragraph 3.2(c) and it's presence adds confusion and ambiguity to depth sizing as required by paragraph 3.2(c). This also makes the weld overlay program consistent with the Supplement 2 depth sizing criteria.
There are however some additional changes that were inadvertently omitted from the Code Case.
The most important change is paragraph 1. 1(e)(2)(a)(1) where the phrase "and base metal on both sides", was inadvertently included in the description 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 paragraph 1.1 (b) last sentence, 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 Attachment A.
PDI has submitted these changes as a Code Case and they have been approved, but the Code Case will not be published until later in 2002. A detailed comparison matrix between Supplement 11, the proposed ASME Section XI Code Case N-654, and the PDI Program (refer to Attachment A) provides supporting documentation. The first column identifies the current requirements in the 95 Edition and 96 Addenda of Supplement 11, while the second (middle) column identifies the changes made by the Code Case.
RELIEF REQUEST NUMBER: CR-37 REVISION 0 (Page 4 of 4)
PROPOSED ALTERNATE EXAMINATIONS Appendix VIII, In lieu of the requirements of ASME Section XI, 1995 Edition, 1996 Addenda, Supplement 11, the PDI Program shall be used.
APPLICABLE TIME PERIOD Program for Quad Cities Relief is requested for the third ten-year interval of the Inservice Inspection 17, 2003 and March 9, 2003 Station Unit I and Unit 2, which is scheduled to conclude on February respectively.
SUPPLEMENT 11 - QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.orglPDF/bcO0- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only) 1.0 SPECIMEN REQUIREMENTS CC N-654 PDI Program 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 sizin 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.
(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 nominal within a range of 0.9 to 1.5 times a nominal diameter shall be considered equivalent. If diameter shall be considered equivalent. If the procedure is applicable to pipe the procedure is applicable to pipe diameters of 24 in. or larger, the specimen diameters of 24 in. or larger, the specimen set must include at least one specimen 24 set must include at least one specimen 24 in. or larger but need not include the in. or larger but need not include the maximum diameter. The specimen set must L maximum diameter. The specimen set CR-37, Rev.0 Attachment A (Page 1 of 10)
SUPPLEMENT 11 - QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.org/PDF/bc00- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only) include at least one specimen with overlay shall include specimens with overlay thickness within -0.1 in. to +0.25 in. of the thickness within +0.1 in. of the minimum maximum nominal overlay thickness for nominal overlay thickness and within which the procedure is applicable. 0.25 in. of the maximum nominal overlay thickness for which the 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.
(d) Flaw Conditions PDI Program (1) Base metal flaws. All flaws must be (1) Base metal flaws. All flaws must be in (I) 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 at open to the inside surface, and extending at and extending at least 75% through the least 75% through the base metal wall. least 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 overlay not interfere with ultrasonic detection or not interfere with ultrasonic detection or material; in this case, intentional overlay characterization of the cracking. Specimens characterization of the base metal flaws.
fabrication flaws shall not interfere with containing IGSCC shall be used when Specimens containing IGSCC shall be used ultrasonic detection or characterization of available. At least 70 percent of the flaws when available. At least 70 percent of the the cracking. Specimens containing IGSCC in the detection-and sizing tests shall be flaws in the detection and sizing tests shall shall be used when available. cracks. Alternative flaw mechanisms, if be cracks and the remainder shall be used, shall provide crack-like reflective alternative flaws. Alternative flaw characteristics and shall be limited by the mechanisms, if used, shall provide crack following: like reflective characteristics and shall be limited by the following:
(a) Flaws shall be limited to when implantation of cracks precludes obtaining (a) Flaws shall be limited to when a realistic ultrasonic response. implantation of cracks precludes obtaining CR-37, Rev.0 Attachment A (Page 2 of 10)
SUPPLEMENT 11 - QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.orgtPDF/bcOO- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only)
(b) Flaws shall be semielliptical wilh a fip width of less than or equal to 0.0)2 inches. (h) Haws shall be semielliptical with a tip
/ width of less than or equal to 0.002 inches.
(2) Overlay fabrication flaws. At least 40% No Change No Change 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% of the flaws shall be cracks. The balance of the flaws shall be of either type.
(e) Detection Specimens PDI Program (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 deg. of base metal flaws shall be oriented within base metal flaws shall be oriented within the pipe axial direction. The remainder +20 deg. of the pipe axial direction. The +20 deg. 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 circumferentially. Flaws shall not be open the candidate has physical or visual access. to any surface to which the candidate has to any surface to which the candidate has The rules of IWA-3300 shall be used to physical or visual access. physical or visual access.
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 characterization of other flaws. characterization of other flaws.
CR-37, Rev.0 Attachment A (Page 3 of 10)
SUPPLEMENT 11 - QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.org/PDF/bcOO- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only)
(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 in. of the length of the overlaid include at least 1 in. of the length of the include at least 1 in. of the length of the weld. The base grading unit includes the overlaid weld. The base metal grading unit overlaid weld. The base metal grading outer 25% of the overlaid weld and base includes the outer 25% of the overlaid weld unit includes the outer 25% of the metal on both sides. The base grading unit and base metal on both sides. The base overlaid weld. The base metal grading unit shall not include the inner 75% of the metal grading unit shall not include the shall not include the inner 75% of the overlaid weld and base metal overlay inner 75% of the overlaid weld and base overlaid weld and base metal overlay material, or base metal-to-overlay interface, metal overlay material, or base metal-to- material, or base metal-to-overlay interface.
overlay interface.
(a)(2) When base metal cracking penetrates (a)(2) When base metal cracking penetrates (a)(2) When base metal flaws penetrate into the overlay material, the base grading into the overlay material, the base metal into the overlay material, the base metal unit shall include the overlay metal within grading unit shall not be used as part of any grading unit shall not be used as part of any 1 in. of the crack location. This portion of overlay fabrication grading unit. overlay fabrication grading unit.
the overlay material shall not be used as part of any overlay grading unit.
(a)(3) When a base grading unit is designed (a)(3) Sufficient unflawed overlaid weld (a)(3) Sufficient unflawed overlaid weld to be unflawed, at least 1 in. of unflawed and base metal shall exist on all sides of the and base metal shall exist on all sides of the overlaid weld and base metal shall exist on grading unit to preclude interfering grading unit to preclude interfering either side of the base grading unit. The reflections from adjacent flaws, reflections from adjacent flaws.
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 specimen.
(b)(1) 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 metal-to- shall include the overlay material and the shall include the overlay material and the overlay interface of at least 6 sq. in. The base metal-to-overlay interface for a length hase metal-to-overlay interface for a length overlay grading unit shall be rectangular, of at least 1 in. of at least 1 in.
with minimum dimensions of 2 in.
CR-37, Rev.0 Attachment A (Page 4 of 10)
SUPPLEMENT 11 - QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.org/PDF/bcOO- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only)
(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 dcsigned to be unflawed shall be separated unflawed overlay material and unflawed by unflawed overlay material and unflawed hy unflawed overlay material and unflawed base metal-to-overlay interface for at least base metal-to-overlay interface for at least Ihase metal-to-overlay interface for at least 1 in. around its entire perimeter. The 1 in. at both ends. Sufficient unflawed I in. 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 both sides of the overlay fabrication grading unit. Overlay grading units need grading unit to preclude interfering grading unit to preclude interfering not be spaced uniformly about the reflections from adjacent flaws. The reflections from adjacent flaws. The specimen. specific area used in one overlay specific area used in one overlay fabrication grading unit shall not be used in fabrication grading unit shall not be used in another overlay fabrication grading unit. 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.
(b)(3) Detection sets shall be selected from (b)(3) Detection sets shall be selected from (b)(3) Detection sets shall be selected from Table VIII-S2-1. The minimum detection Table VIII-S2-1. The minimum detection Table VIII-S2-1. The minimum detection sample set is five flawed base grading sample set is five flawed base metal sample set is five flawed base metal units, ten unflawed base grading units, five grading units, ten unflawed base metal grading units, ten unflawed base metal flawed overlay grading units, and ten grading units, five flawed overlay grading units, five flawed overlay unflawed overlay grading units. For each fabrication grading units, and ten unflawed fabrication grading units, and ten unflawed type of grading unit, the set shall contain at overlay fabrication grading units. For each overlay fabrication grading units. For each least twice as many unflawed as flawed type of grading unit, the set shall contain at type of grading unit, the set shall contain at grading units. least twice as many unflawed as flawed 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 personnel of essential variables, at least one personnel CR-37, Rev.0 Attachment A (Page 5 of 10)
SUPPLEMENT 11 - QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.org/PDF/bcOO- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only) qualification set is required. qualification set is required.
(f) Sizing Specimen PDI Program (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% 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. For initial procedure qualification, surface. For initial procedure qualification, sizing sets shall include the equivalent of sizing sets shall include the equivalent of three personnel qualification sets. To three personnel qualification sets. To qualify new values of essential variables, at qualify new values of essential variables, at least one personnel qualification set is least one personnel qualification set is required. required.
(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 at least two distinct locations where include at least two distinct locations where cracking in the base metal extends into the flaws in the base metal extend into the overlay material by at least 0.1 in. in the overlay material by at least 0.1 in. in the through-wall direction. through-wall direction.
CR-37, Rev.0 Attachment A (Page 6 of 10)
SUPPLEMENT 11 - QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.org/PDF/bc00- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only) 2.0 CONDUCT OF CC N-654 PDI Program PERFORMANCE DEMONSTRATION The specimen inside surface and The specimen inside surlacc and The specimen inside surface and identification shall be concealed from the identification shall be concealed froin 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 comnpleted 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. PDI Program Flawed and unflawed grading units shall be Flawed and unflawed grading units shall be Flawed and unflawed grading units shall be randomly mixed. Although the boundaries randomly mixed. Although the boundaries randomly mixed. Although the boundaries of specific grading units shall not be of specific grading units shall not be of specific grading units shall not be revealed to the candidate, the candidate revealed to the candidate, the candidate revealed to the candidate, the candidate shall be made aware of the type or types of shall be made aware of the type or types of shall be made aware of the type or types of grading units (base or overlay) that are grading units (base metal or overlay grading units (base metal or overlay present for each specimen. fabrication) that are present for each fabrication) that are present for each specimen. specimen.
2.2 Length Sizing Test PDI Program (a) The length sizing test may be conducted No Change 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 CR-37, Rev.0 Attachment A (Page 7 of 10)
SUPPLEMENT 11- QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.org/PDF/bcOO- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only) 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.
(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, (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 25% of that part of the flaw that is in the outer 25% that part of the flaw that is in the outer 25%
the base wall thickness. of the base metal wall thickness. of the base metal wall thickness.
2.3 Depth Sizing Test. PDI Program 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 the maximum depth of the flaw in each region.
CR-37, Rev.0 Attachment A (Page 8 of 10)
SUPPLEMENT 11- QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.org/PDF/bcOO- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only) 3.0 ACCEPTANCE CRIT IA 3.1 Detection Acceptance Criteria. CC N-654 PDI Program Examination procedures, equipment, and Examination procedures are qualified for I;xainination procedures are qualified for personnel are qualified for detection when detection when all flaws within the scope dltection when all flaws within the scope the results of the performance of the procedure are detected and the of the procedure are detected and the demonstration satisfy the acceptance results of the performance demonstration results of the performance demonstration criteria of Table VIII-S2-1 for both satisfy the acceptance criteria of Table satisfy the acceptance criteria of Table detection and false calls. The criteria shall VIII-S2-1 for false calls. Examination VIII-S2-1 for false calls. Examination be satisfied separately by the demonstration equipment and personnel are qualified for equipment and personnel are qualified for results for base grading units and for detection when the results of the detection when the results of the overlay grading units. performance demonstration satisfy the performance demonstration satisfy the acceptance criteria of Table VIII-S2-1 for acceptance criteria of Table VIU-S2-1 for both detection and false calls. The criteria both detection and false calls. The criteria shall be satisfied separately by the shall be satisfied separately by the demonstration results for base metal demonstration results for base metal grading units and for overlay fabrication grading units and for overlay fabrication grading units. grading units.
3.2 Sizing Acceptance Criteria. PDI Program 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 inch. The length of base metal cracking is inch. The length of base metal flaws is measured at the 75% through-base-metal measured at the 75% through-base-metal position. position.
CR-37, Rev.0 Attachment A (Page 9 of 10)
SUPPLEMENT 11 - QUALIFICATION PROPOSED CODE CASE N-654 PDI PROGRAM:
REQUIREMENTS FOR FULL Extracted from: The Proposed Alternative to STRUCTURAL OVERLAID http://www.boilercode.org/PDF/bcOO- Supplement 11 Requirements WROUGHT AUSTENITIC PIPING 756R.pdf WELDS (Provided for Information Only)
(b) All extensions of base metal cracking This requirement is omitted. This requirement is omitted.
into the overlay material by at least 0.1 in.
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 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 in. in. in.
CR-37, Rev.0 Attachment A (Page 10 of 10)