ML023360393

Request for Relief from ASME Code Section XI, Appendix Viii, Supplement 11, Inservice Inspection Requirements

ML023360393
Person / Time
Site:	Nine Mile Point
Issue date:	11/20/2002
From:	Montgomery B Constellation Energy Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NMP2L 2073, TAC MB5732
Download: ML023360393 (15)

Text

P.O. Box 63 Lycoming, New York 13093 0

Constellation Energy Group Nine Mile Point Nuclear Station November 20, 2002 NMP2L 2073 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

SUBJECT:

Nine Mile Point Unit 2 Docket No. 50-410 License No. NPF-69 TAC No. MB5732 Request for Relief from ASME Code Section XI, Appendix VII, Supplement 11, Inservice Inspection Requirements Gentlemen:

Nine Mile Point Nuclear Station, LLC (NMPNS) is submitting the enclosed inservice inspection relief request ISI-23B for Nine Mile Point Unit 2 (NMP2). Upon NRC approval, this relief request will allow utilization of the performance demonstration initiative (PDI) program as an alternative to the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code), 1995 Edition with 1996 Addenda, Appendix VIII, Supplement 11, requirements. Relief is being requested in accordance with 10CFR50.55a(a)(3)(i) on the basis that the proposed alternative will provide an acceptable level of quality and safety.

According to 10CFR50.55a(g)(6)(ii)(C), as of November 22, 2001, weld overlay examinations must meet the ASME Code Section XI, 1995 Edition, 1996 Addenda, Appendix VIII, Supplement 11 requirements. As the result of discussions with the Electric Power Research Institute (EPRI) staff, NMPNS has determined that prior to performing ultrasonic testing of any ASME Code Class weld overlays at NMP2, relief from the requirements of the ASME Code,Section XI, Appendix VIII, Supplement 11, would be necessary. To accomplish this, a relief request must be submitted proposing either (1) adoption of proposed Code Case N-653, "Qualification Requirements for Full Structural Overlaid Wrought Austenitic Piping Welds,Section XI, Division 1," with some modifications, or (2) use of the EPRI PDI Program in lieu of the ASME Code,Section XI, Appendix VIII, Supplement 11, requirements. EPRI has worked in conjunction with the NRC staff to develop a sample request for using alternative 2 above, to ensure that sufficient information is included in each licensee's relief request to support NRC approval.

AOHJ

Page 2 NMP2L 2073 Relief request ISI-23B applies to a weld overlay that is ASME Code Class 1 and also subject to examination requirements of NRC Generic Letter (GL) 88-01, "NRC Position on IGSCC in BWR Austenitic Stainless Steel Piping." NMPNS plans to utilize the PDI program to satisfy both ASME Code requirements and GL 88-01 requirements. Relief request ISI-23B has been prepared using the EPRI sample and guidance previously discussed. Attachment 1 to the relief request provides a comparison matrix identifying the differences among (a) the ASME Code,Section XI, Appendix VIII, Supplement 11, (b) the proposed ASME Code Case N-653, and (c) the PDI program for weld overlay examinations. This additional information was developed by EPRI and is provided to assist in NRC review of the relief request.

NMPNS requests NRC approval of relief request ISI-23B by October 1, 2003, to support NMP2 weld examinations planned for refueling outage number 9 in Spring 2004.

Very truly yours, Bruce S onantoery Mana 7er Engineering S BSM/IAA/jm

Enclosure:

cc:

Mr. H. J. Miller, NRC Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector Mr. P. S. Tam, Senior Project Manager, NRR (2 copies)

ENCLOSURE (This Enclosure consists of Relief Request ISI-23B and to ISI-23B. )

NINE MILE POINT UNIT 2 SECOND INSERVICE INSPECTION INTERVAL RELIEF REQUEST ISI-23B A.

COMPONENT IDENTIFICATION System:

Feedwater System Class:

ASME Code Class 1 Component

Description:

Dissimilar Metal Weld Between Feedwater Nozzle N4D and 12.0" Safe End Component Identification:

2RPV-KB20-OL, Nozzle-To-Safe End Weld B.

ASME CODE SECTION XI REQUIREMENTS ASME Code Section XI, 1995 Edition with 1996 Addenda, Appendix VIII, Supplement 11, "Qualification Requirements For Full Structural Overlaid Wrought Austenitic Piping Welds" The Code requirements for which relief is being requested are 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 percent but less than 40 percent 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 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)(1) requires that a base grading unit shall include at least 3 inches 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 square inches. The overlay grading unit shall be rectangular, with minimum dimensions of 2 inches. 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.

C.

RELIEF REQUESTED Pursuant to 10 CFR 50.55a(a)(3)(i), Nine Mile Point Nuclear Station, LLC (NMPNS) requests relief to use the Electric Power Research Institute (EPRI) Performance Demonstration Initiative (PDI) Program for implementation of ASME Code,Section XI, Appendix VIII, Supplement 11 requirements.

D.

BASIS FOR RELIEF Paragraph 1.1 (d)(1), requires that all 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. While this may be satisfactory for ferritic materials, it does not produce a usable 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 PDI program revised this paragraph to allow use of alternative flaw mechanisms under controlled conditions.

For example, alternative flaws shall be limited to when implantation of cracks precludes obtaining an effective ultrasonic response, flaws shall be semielliptical with a tip width of less than or equal to 0.002 inch, and at least 70 percent of the flaws in the detection and sizing test shall be cracks and the remainder shall be alternative flaws.

IS123B-1 OF IS123B-3

NINE MILE POINT UNIT 2 SECOND INSERVICE INSPECTION INTERVAL RELIEF REQUEST ISI-23B Sa Mechanical fatigue crack areaý 4*

in Base imatenal 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 (NRC/BWROG/EPRI) agreement have a flaw population density greater than allowed by the current Code requirements. These samples have been used successfully for all 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: the requirement for using 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)(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)(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 inches requirement of Supplement 11; and paragraph 1.1 (e)(2)(b)(2) states that overlay fabrication grading units designed to be unflawed shall be separated by unflawed overlay material and unflawed base metal-to-overlay interface for at least 1 inch 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 flaws are unrealistic.

The requirement in paragraph 3.2(b) for reporting all extensions of cracking into the overlay is omitted from the PD1 Program because it is redundant to the root means square (RMS) calculations performed in paragraph 3.2(c) and its 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.

PD1 submitted these changes as Code Case N-653. ASME approved Code Case N-653 on September 7, 2001, however, 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-653, and the PDI Program (refer to Attachment 1) 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.

IS123B-2 OF IS123B-3

NINE MILE POINT UNIT 2 SECOND INSERVICE INSPECTION INTERVAL RELIEF REQUEST ISI-23B There are, however, some additional changes that were inadvertently omitted from the Code Case. The most significant change is paragraph 1.1 (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. Additionally 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. The overlay thickness tolerance contained in paragraph 1.1 (b) last sentence, was also 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).

Additionally, the NRC staff issued a request for additional information (RAI) that would result in some revisions to the semantics used to describe the PDI program. NMPNS has incorporated the PDI proposed changes to Attachment 1, column three for information purposes. NMPNS recognizes that the proposed wording may change based upon future NRC staff and PDI discussions.

These changes are identified by bold print in the third column of the enclosure.

E.

ALTERNATIVE EXAMINATIONS As an alternate to the requirements of ASME Section XI, 1995 Edition, 1996 Addenda, Appendix VIII, Supplement 11, NMPNS proposes to use the PDI Program. 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).

F.

IMPLEMENTATION SCHEDULE The remainder of the Second Ten-Year Inservice Inspection Interval for Unit 2, (April 5, 1998 through April 4, 2008).

G.

ATTACHMENTS Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program ISI23B-3 OF ISI23B-3

ATTACHMENT 1 Comparison of the ASME Code, Section X1, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program SUPPLEMENT 11 -QUALIFICATION CODE CASE N-653 PDI PROGRAM:

REQUIREMENTS FOR FULL STRUCTURAL The Proposed Alternative to OVERLAID WROUGHT AUSTENITIC PIPING (Provided for Information Only)

Supplement 11 Requirements WELDS 1.0 SPECIMEN REQUIREMENTS Qualification test specimens shall meet the requirements No Change No Change 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 conform to the No Change No Change following requirements.

(a) Specimens shall have sufficient volume to minimize No Change No Change spurious reflections that may interfere with the interpretation process.

(b) The specimen set shall consist of at least three No Change (b) The specimen set shall consist of at least three specimens having different nominal pipe diameters and specimens having different nominal pipe overlay thicknesses. They shall include the minimum and diameters and overlay thicknesses. They shall maximum nominal pipe diameters for which the include the minimum and maximum nominal pipe examination procedure is applicable. Pipe diameters diameters for which the examination procedure is within a range of 0.9 to 1.5 times a nominal diameter applicable. Pipe diameters within a range of 0.9 to shall be considered equivalent. If the procedure is 1.5 times a nominal diameter shall be considered applicable to pipe diameters of 24 in. or larger, the equivalent. If the procedure is applicable to pipe specimen set must include at least one specimen 24 in.

diameters of 24 in. or larger, the specimen set or larger but need not include the maximum diameter.

must include at least one specimen 24 in. or larger The specimen set must include at least one specimen but need not include the maximum diameter. The with overlay thickness within -0.1 in. to +0.25 in. of the specimen set shall Include specimens with maximum nominal overlay thickness for which the overlays not thicker than 0.1 in. more than the procedure is applicable, minimum thickness, nor thinner than 0.25 in. of the maximum nominal overlay thickness for which the examination procedure is applicable.

(c) The surface condition of at least two specimens shall No Change No Change approximate the roughest surface condition for which the examination procedure is applicable.

(d) Flaw Conditions RR-ISI-23B Page 23-1 of 23-9

ATTACHMENT 1 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program SUPPLEMENT 11-QUALIFICATION CODE CASE N-653 PDI PROGRAM:

REQUIREMENTS FOR FULL STRUCTURAL The Proposed Alternative to OVERLAID WROUGHT AUSTENITIC PIPING (Provided for Information Only)

Supplement 11 Requirements WELDS (1) Base metal flaws. All flaws must be cracks in or near (1) Base metal flaws. All flaws must be in or (1) Base metal flaws. All flaws must be in or near the butt weld heat-affected zone, open to the inside near the butt weld heat-affected zone, open to the butt weld heat-affected zone, open to the surface, and extending at least 75% through the base the inside surface, and extending at least 75%

inside surface, and extending at least 75% through metal wall. Flaws may extend 100% through the base through the base metal wall. Intentional overlay the base metal wall. Intentional overlay fabrication metal and into the overlay material; in this case, fabrication flaws shall not interfere with flaws shall not interfere with ultrasonic detection or intentional overlay fabrication flaws shall not interfere ultrasonic detection or characterization of the characterization of the base metal flaws.

with ultrasonic detection or characterization of the cracking. Specimens containing IGSCC shall be Specimens containing IGSCC shall be used when cracking. Specimens containing IGSCC shall be used used when available. At least 70 percent of the available. At least 70 percent of the flaws in the when available.

flaws in the detection and sizing tests shall be detection and sizing tests shall be cracks and the cracks. Alternative flaw mechanisms, if used, remainder shall be alternative flaws. Alternative shall provide crack-like reflective characteristics flaw mechanisms, if used, shall provide crack-like and shall be limited by the following:

reflective characteristics and shall be limited by the following:

(a) Flaws shall be limited to when implantation of cracks precludes obtaining a realistic (a) The use of Alternative flaws shall be limited ultrasonic response.

to when the implantation of cracks produces spurious reflectors that are uncharacteristic of (b) Flaws shall be semielliptical with a tip width actual flaws.

of less than or equal to 0.002 inches.

(b) Flaws shall be semielliptical with a tip width of less than or equal to 0.002 inches.

(2) Overlay fabrication flaws. At least 40% of the flaws No Change No Change 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 RR-ISI-23B Page 23-2 of 23-9

SUPPLEMENT 11-QUALIFICATION CODE CASE N-653 PDI PROGRAM:

REQUIREMENTS FOR FULL STRUCTURAL The Proposed Alternative to OVERLAID WROUGHT AUSTENITIC PIPING (Provided for Information Only)

Supplement 11 Requirements WELDS (1) At least 20% but less than 40% of the flaws shall be (1) At least 20% but less than 40% of the base (1) At least 20% but less than 40% of the base oriented within +20 deg. of the pipe axial direction. The metal flaws shall be oriented within +20 deg. of metal flaws shall be oriented within +20 deg. of the remainder shall be oriented circumferentially. Flaws shall the pipe axial direction. The remainder shall be pipe axial direction. The remainder shall be not be open to any surface to which the candidate has oriented circumferentially. Flaws shall not be oriented circumferentially. Flaws shall not be open physical or visual access. The rules of IWA-3300 shall open to any surface to which the candidate has to any surface to which the candidate has physical be used to determine whether closely spaced flaws physical or visual access.

or visual access.

should be treated as single or multiple flaws.

(2) Specimens shall be divided into base and over-lay (2) Specimens shall be divided into base metal (2) Specimens shall be divided into base metal grading units. Each specimen shall contain one or both and overlay fabrication grading units. Each and overlay fabrication grading units. Each types of grading units.

specimen shall contain one or both types of specimen shall contain one or both types of grading units. Flaws shall not interfere with grading units. Flaws shall not interfere with ultrasonic detection or characterization of other ultrasonic detection or characterization of other flaws.

flaws.

(a)(1) A base grading unit shall include at least 3 in. of (a)(1) A base metal grading unit shall include at (a)(1) A base metal grading unit includes the the length of the overlaid weld. The base grading unit least 1 in. of the length of the overlaid weld. The overlay material and the outer 25% of the includes the outer 25% of the overlaid weld and base base metal grading unit includes the outer 25%

original overlaid weld. The base metal grading metal on both sides. The base grading unit shall not of the overlaid weld and base metal on both unit shall extend circumferentially for at least include the inner 75% of the overlaid weld and base sides. The base metal grading unit shall not 1 In. and shall start at the weld centerline and metal overlay material, or base metal-to-overlay include the inner 75% of the overlaid weld and be wide enough in the axial direction to interface.

base metal overlay material, or base metal-to-encompass one half of the original weld crown overlay interface, and a minimum of 0.50" of the adjacent base material.

(a)(2) When base metal cracking penetrates into the (a)(2) When base metal cracking penetrates into (a)(2) When base metal flaws penetrate into the overlay material, the base grading unit shall include the the overlay material, the base metal grading unit overlay material, the base metal grading unit shall overlay metal within 1 in. of the crack location. This shall not be used as part of any overlay not be used as part of any overlay fabrication portion of the overlay material shall not be used as part fabrication grading unit.

grading unit.

of any overlay gradinq unit.

I I

RR-ISI-23B Page 23-3 of 23-9 ATrACHMENT 1 ComDarison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PD1 Program

ATTACHMENT 1 Comparison of the ASME Code, Section X1, Supplement 11 to ASME Code Case N-653 and the EPRI PD1 Program SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:

REQUIREMENTS FOR FULL STRUCTURAL The Proposed Alternative to OVERLAID WROUGHT AUSTENITIC PIPING (Provided for Information Only)

Supplement 11 Requirements WELDS (a)(3) When a base grading unit is designed to be (a)(3) Sufficient unflawed overlaid weld and (a)(3) Sufficient unflawed overlaid weld and base unflawed, at least 1 in. of unflawed overlaid weld and base metal shall exist on all sides of the grading metal shall exist on all sides of the grading unit to base metal shall exist on either side of the base grading unit to preclude interfering reflections from preclude interfering reflections from adjacent unit. The segment of weld length used in one base adjacent flaws.

flaws.

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 the overlay (b)(1) An overlay fabrication grading unit shall (b)(1) An overlay fabrication grading unit shall material and the base metal-to-overlay interface of at include the overlay material and the base metal-include the overlay material and the base metal-to least 6 sq. in. The overlay grading unit shall be to-overlay interface for a length of at least 1 in.

overlay interface for a length of at least 1 in.

rectangqular, with minimum dimensions of 2 in.

(b)(2) An overlay grading unit designed to be unflawed (b)(2) Overlay fabrication grading units designed (b)(2) Overlay fabrication grading units designed shall be surrounded by unflawed overlay material and to be unflawed shall be separated by unflawed to be unflawed shall be separated by unflawed unflawed base metal-to-overlay interface for at least 1 in.

overlay material and unflawed base metal-to-overlay material and unflawed base metal-to around its entire perimeter. The specific area used in overlay interface for at least 1 in. at both ends.

overlay interface for at least 1 in. at both ends.

one overlay grading unit shall not be used in another Sufficient unflawed overlaid weld and base Sufficient unflawed overlaid weld and base metal overlay grading unit. Overlay grading units need not be metal shall exist on both sides of the overlay shall exist on both sides of the overlay fabrication spaced uniformly about the specimen.

fabrication grading unit to preclude interfering grading unit to preclude interfering reflections from reflections from adjacent flaws. The specific adjacent flaws. The specific area used in one area used in one overlay fabrication grading unit overlay fabrication grading unit shall not be used shall not be used in another overlay fabrication in another overlay fabrication grading unit. Overlay grading unit. Overlay fabrication grading units fabrication grading units need not be spaced need not be spaced uniformly about the uniformly about the specimen.

specimen.

RR-ISI-23B Page 23-4 of 23-9

ATTACHMENT 1 Comnarison of the ASME Code. Section Xl. Sunolement 11 to ASME Code Case N-653 and the EPRI PD1 Prociram SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:

REQUIREMENTS FOR FULL STRUCTURAL The Proposed Alternative to OVERLAID WROUGHT AUSTENITIC PIPING (Provided for Information Only)

Supplement 11 Requirements WELDS (b)(3) Detection sets shall be selected from Table VIII-(b)(3) Detection sets shall be selected from (b)(3) Detection sets shall be selected from Table S2-1. The minimum detection sample set is five flawed Table VIII-S2-1. The minimum detection sample VIII-S2-1. The minimum detection sample set is base grading units, ten unflawed base grading units, five set is five flawed base metal grading units, ten five flawed base metal grading units, ten unflawed flawed overlay grading units, and ten unflawed overlay unflawed base metal grading units, five flawed base metal grading units, five flawed overlay grading units. For each type of grading unit, the set shall overlay fabrication grading units, and ten fabrication grading units, and ten unflawed overlay contain at least twice as many unflawed as flawed unflawed overlay fabrication grading units. For fabrication grading units. For each type of grading grading units.

each type of grading unit, the set shall contain at unit, the set shall contain at least twice as many least twice as many unflawed as flawed grading unflawed as flawed grading units.

For initial units.

For initial procedure qualification, procedure qualification, detection sets shall detection sets shall include the equivalent of include the equivalent of three personnel three personnel qualification sets. To qualify qualification sets.

To qualify new values of new values of essential variables, at least one essential variables, at least one personnel personnel qualification set is required, qualification set is required.

(f) Sizing Specimen (1) The minimum number of flaws shall be ten. At least (1) The minimum number of flaws shall be ten.

(1) The minimum number of flaws shall be ten. At 30% of the flaws shall be overlay fabrication flaws. At At least 30% of the flaws shall be overlay least 30% of the flaws shall be overlay fabrication least 40% of the flaws shall be cracks open to the inside fabrication flaws. At least 40% of the flaws shall flaws. At least 40% of the flaws shall be open to surface.

be cracks open to the inside surface. For initial the inside surface. Sizing sets shall contain a procedure qualification, sizing sets shall include distribution of flaw dimensions to assess the equivalent of three personnel qualification sizing capabilities.

For initial procedure sets.

To qualify new values of essential qualification, sizing sets shall include the variables, at least one personnel qualification equivalent of three personnel qualification sets.

set is required.

To qualify new values of essential variables, at

,__least one personnel qualification set is required.

(2) At least 20% but less than 40% of the flaws shall be No Change No Change 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 sizing No Change (3) Base metal flaws used for length sizing demonstrations shall be oriented circumferentially.

demonstrations shall be oriented circumferentially.

RR-ISI-23B Page 23-5 of 23-9

ATTACHMENT 1 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program SUPPLEMENT 11 -QUALIFICATION CODE CASE N-653 PDI PROGRAM:

REQUIREMENTS FOR FULL STRUCTURAL The Proposed Alternative to OVERLAID WROUGHT AUSTENITIC PIPING (Provided for Information Only)

Supplement 11 Requirements WELDS (4) Depth sizing specimen sets shall include at least two No Change (4) Depth sizing specimen sets shall include at distinct locations where cracking in the base metal least two distinct locations where a base metal extends into the overlay material by at least 0.1 in. in the flaw extends into the overlay material by at least through-wall direction.

0.1 in. in the through-wall direction.

2.0 CONDUCT OF PERFORMANCE DEMONSTRATION The specimen inside surface and identification shall be The specimen inside surface and identification The specimen inside surface and identification concealed from the candidate. All examinations shall be shall be concealed from the candidate. All shall be concealed from the candidate. All completed prior to grading the results and presenting the examinations shall be completed prior to grading examinations shall be completed prior to grading results to the candidate. Divulgence of particular the results and presenting the results to the the results and presenting the results to the specimen results or candidate viewing of unmasked candidate. Divulgence of particular specimen candidate. Divulgence of particular specimen specimens after the performance demonstration is results or candidate viewing of unmasked results or candidate viewing of unmasked prohibited.

specimens after the performance demonstration specimens after the performance demonstration is is prohibited. The overlay fabrication flaw test prohibited. The overlay fabrication flaw test and and the base metal flaw test may be performed the base metal flaw test may be performed separately.

separately.

2.1 Detection Test.

Flawed and unflawed grading units shall be randomly Flawed and unflawed grading units shall be Flawed and unflawed grading units shall be mixed. Although the boundaries of specific grading units randomly mixed. Although the boundaries of randomly mixed. Although the boundaries of shall not be revealed to the candidate, the candidate specific grading units shall not be revealed to specific grading units shall not be revealed to the shall be made aware of the type or types of grading units the candidate, the candidate shall be made candidate, the candidate shall be made aware of (base or overlay) that are present for each specimen.

aware of the type or types of grading units (base the type or types of grading units (base metal or metal or overlay fabrication) that are present for overlay fabrication) that are present for each each specimen.

specimen.

2.2 Length Sizing Test (a) The length sizing test may be conducted separately No Change No Change or in coniunction with the detection test.

I RR-ISI-23B Page 23-6 of 23-9

ATTACHMENT 1 Comparison of the ASME Code,Section XI, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PDI PROGRAM:

REQUIREMENTS FOR FULL STRUCTURAL The Proposed Alternative to OVERLAID WROUGHT AUSTENITIC PIPING (Provided for Information Only)

Supplement 11 Requirements WELDS (b) When the length sizing test is conducted in No Change No Change 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.

(c) For a separate length sizing test, the regions of each No Change No Change 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 candidate shall (d) For flaws in base metal grading units, the (d) For flaws in base metal grading units, the estimate the length of that part of the flaw that is in the candidate shall estimate the length of that part candidate shall estimate the length of that part of outer 25% of the base wall thickness.

of the flaw that is in the outer 25% of the base the flaw that is in the outer 25% of the base metal wall thickness.

metal wall thickness.

2.3 Depth Sizing Test.

For the depth sizing test, 80% of the flaws shall be sized The candidate shall determine the depth of the (a) The depth sizing test may be conducted at a specific location on the surface of the specimen flaw in each region.

separately or in conjunction with the detection identified to the candidate. For the remaining flaws, the test.

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 regiion.

__b)

Whenthedepthsizingtestisconductedin (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.

RR-ISI-23B Page 23-7 of 23-9

RR-ISI-23B Page 23-8 of 23-9

'I ATTACHMENT 1 Comparison of the ASME Code, Section Xl, Supplement 11 to ASME Code Case N-653 and the EPRI PDI Program SUPPLEMENT 11-QUALIFICATION CODE CASE N-653 PDI PROGRAM:

REQUIREMENTS FOR FULL STRUCTURAL The Proposed Alternative to OVERLAID WROUGHT AUSTENITIC PIPING (Provided for Information Only)

Supplement 11 Requirements WELDS (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.

3.0 ACCEPTANCE CRITERIA 3.1 Detection Acceptance Criteria Examination procedures, equipment, and personnel Examination procedures are qualified for (a) Examination procedures are qualified for are qualified for detection when the results of the detection when all flaws within the scope of the detection when:

performance demonstration satisfy the acceptance procedure are detected and the results of the criteria of Table VIII-S2-1 for both detection and false performance demonstration satisfy the calls. The criteria shall be satisfied separately by the acceptance criteria of Table VIII-S2-1 for false demonstration results for base grading units and for calls. Examination equipment and personnel are overlay grading units.

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.

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-$2-1 for false calls.

(a)

At least one successful personnel demonstration has been performed meeting the acceptance criteria defined in (b).

(b) Examination equipment and personnel are qualified for detection when the results of the performance demonstration satisfy the acceptance criteria of Table VIII-$2-1 for both detection and false calls.

a.

SUPPLEMENT 11 -QUALIFICATION CODE CASE N-653 PDI PROGRAM:

REQUIREMENTS FOR FULL STRUCTURAL The Proposed Alternative to OVERLAID WROUGHT AUSTENITIC PIPING (Provided for Information Only)

Supplement 11 Requirements WELDS (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 personnel No Change No Change are qualified for sizing when the results of the performance demonstration satisfy the following criteria.

(a) The RMS error of the flaw length measurements, No Change (a) The RMS error of the flaw length measurements, as compared to the true flaw lengths, is less than or as compared to the true flaw lengths, is less than or equal to 0.75 inch. The length of base metal cracking equal to 0.75 inch. The length of base metal flaws is is measured at the 75% throuqh-base-metal position.

measured at the 75% throuqh-base-metal position.

(b) All extensions of base metal cracking into the This requirement is omitted.

This requirement is omitted.

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 measurements, (b) The RMS error of the flaw depth (b) The RMS error of the flaw depth measurements, as compared to the true flaw depths, is less than or measurements, as compared to the true flaw as compared to the true flaw depths, is less than or equal to 0.125 in.

depths, is less than or equal to 0.125 in.

equal to 0.125 in.

RR-ISI-23B Page 23-9 of 23-9 ATTACHMENT 1 ComDarison of the ASME Code, Section X1, Supplement 11 to ASME Code Case N-653 and the EPRI PD1 Program