ML032731400
| ML032731400 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 09/18/2003 |
| From: | Domonique Malone Nuclear Management Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML032731400 (19) | |
Text
i Conmnedbfucteuoxce~p Palisades Nuclear Plant Operated by Nuclear Management Company, LLC September 18, 2003 10 CFR 50.55a(a)(3)(i)
U S Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 PALISADES NUCLEAR PLANT DOCKET 50-255 LICENSE No. DPR-20 REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX VilI, SUPPLEMENT 11 CODE REQUIREMENTS Nuclear Management Company, LLC (NMC) requests approval for relief from the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section Xl, 1995 Edition with the 1996 Addenda, Appendix VIII, Supplement 11,
'Qualification Requirements for Full Structural Overlaid Wrought Austenitic Piping Welds," examination requirements for the Palisades Nuclear Plant. The basis for the relief request is attached describing that the proposed alternative provides an acceptable level of quality and safety, pursuant to 10 CFR 50.55a(a)(3)(i).
The technical content of the request for relief is consistent with the Electrical Power Research Institute sponsored Performance Demonstration Initiative model, which was updated to reflect changes as a result of Nuclear Regulatory Commission requests for additional information made to other licensees.
NMC requests approval of the proposed relief request by July 1, 2004, to support Palisades upcoming refueling outage.
This letter contains no new commitments and no revisions to existing commitments.
Daniel J. Malone Site Vice-President, Palisades Nuclear Plant CC Regional Administrator, USNRC, Region IlIl Project Manager, Palisades Nuclear Plant, USNRC, NRR NRC Resident Inspector - Palisades Nuclear Plant Enclosure with Attachment 27780 Blue Star Memorial Highway
- Covert, Michigan 49043-9530 Telephone: 269.764.2000
ENCLOSURE I NUCLEAR MANAGEMENT COMPANY, LLC PALISADES NUCLEAR PLANT DOCKET 50-255 SEPTEMBER 18, 2003 REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX Vill, SUPPLEMENT 11 CODE REQUIREMENTS 17 Pages Follow
ENCLOSURE 1 PALISADES NUCLEAR PLANT REQUEST FOR RELIEF FROM ASME SECTION XI, APPENDIX VIII, SUPPLEMENT 11 CODE REQUIREMENTS COMPONENT IDENTIFICATION The affected components are Palisades Nuclear Plant pressure retaining welds in piping, subject to American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (BPV) Code, Section Xl, 1995 Edition with the 1996 Addenda, Appendix Vil, Supplement 11, Qualification Requirements for Full Structural Overlaid Wrought Austenitic Piping Welds," examination.
CODE REQUIREMENTS The following paragraphs are examples of the code requirements for which relief is requested, all of which are contained within Appendix Vil, Supplement 11.
Paragraph 1.1 (d)(1), requires that all base metal flaws be cracks.
Paragraph 1.1(eXl) requires that at least 20 percent (%) but less than 40% of the flaws shall be oriented within +20 degrees of the pipe axial direction.
Paragraph 1.1 (eXI) 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)(aXl) requires that a base grading unit shall include at least three inches of the length of the overlaid weld.
Paragraph 1.1 (e)(2)(b)(1) requires that an overlay grading unit shall include the overlay material and the base metal-to-overlay interface of at least six square inches. The overlay grading unit shall be rectangular, with minimum dimensions of two inches.
Paragraph 3.2(b) requires that all extensions of base metal cracking into the overlay material by at least 0.1 inches be reported as being Intrusions into the overlay material.
BASIS FOR RELIEF Nuclear Management Company, LLC (NMC) is requesting relief from Appendix Vill, Supplement 11, pursuant to 10 CFR 50.55a(aX3)(i). NMC proposes an alternative to use the Performance Demonstration Initiative (PDI)
Program for implementation of Appendix Vil, Supplement 11 requirements.
1
ENCLOSURE 1 PALISADES NUCLEAR PLANT REQUEST FOR RELIEF FROM ASME SECTION Xl, APPENDIX Vil, SUPPLI-tMENT i1 CODE REQUIREMENTS 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 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 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 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.
I n Mechanical fiatigue crack Relief Is requested to allow closer spacing of flaws provided the flaws do not interfere with detection or discrimination. The existing specimens used to date for qualification to the tri-party (Nuclear Regulatory Commission (NRC)/Boiling Water Reactor Owners Group (BWROG)IElectrical Power Research Institute (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(eX)) was excluded. Instead, Indications will be sized based on their individual merits.
Paragraph 1.1 (dXl) includes the statement that intentional overlay fabrication flaws shall not interfere with ultrasonic detection or characterization of the base metal flaws.
Paragraph 1.1(eX2)(aX1) was modified to require that a base metal grading unit include at least one-inch of the length of the overlaid weld, rather than three inches.
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ATTACHMENT TO ENCLOSURE 1 PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX Vil, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 1.0 SPECIMEN REQUIREMENTS Qualification test specimens shall meet the No Change No Change requirements listed herein, unless a set of specimens is designed to accommodate specific limitations stated in the scope of the examination procedure (e.g., pipe size, weld joint configuration, access limitations). The same specimens may be used to demonstrate both detection and sizing qualification.
1.1 General. The specimen set shall No Change No Change conform to the following requirements.
(a) Specimens shall have sufficient volume No Change No Change to minimize spurious reflections that may interfere with the interpretation process.
(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 inches or larger, the diameters of 24 inches or larger, the 1 of 13
ATTACHMENT TO ENCLOSURE I PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX Vil, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS specimen set must include at least one specimen set must include at least one specimen 24 inches or larger but need not specimen 24 inches or larger but need not include the maximum diameter. The include the maximum diameter.
specimen set must include at least one The specimen set shall include specimens specimen with overlay thickness within with overlays not thicker than 0.1 inches
-0.1 inches. to +0.25 inches of the more than the minimum thickness, nor maximum nominal overlay thickness for thinner than 0.25 inches of the maximum which the procedure is applicable. nominal overlay thickness for which the examination procedure is applicable.
(c) The surface condition of at least two No Change No Change specimens shall approximate the roughest surface condition for which the examination procedure is applicable.
(d) Flaw Conditions (1) Base metalflaws. All flaws must be (1) Base metal flaws. All flaws must be in (1) Base metal flaws. All flaws must be in cracks in or near the butt weld heat- or near the butt weld heat-affected zone, or near the butt weld heat-affected zone, affected zone, open to the inside surface, open to the inside surface, and extending 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. when available. At least 70 percent of the the cracking. Specimens containing IGSCC (a) At least 70 percent of the flaws in the flaws in the detection and sizing tests shall shall be used when available. detection and sizing tests shall be cracks. be cracks and the remainder shall be Alternative flaw mechanisms, if used, shall alternative flaws. Alternative flaw 2 of 13
ATTACHMENT TO ENCLOSURE 1 PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX V1I1, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS provide crack-like reflective characteristics mechanisms, if used, shall provide crack-and shall be limited by the following: like reflective characteristics and shall be limited by the following:
(1) Flaws shall be limited to when implantation of cracks precludes obtaining (a) The use of Alternative flaws shall be a realistic ultrasonic response. limited to when the implantation of cracks produces spurious reflectors that are (2) Flaws shall be semielliptical with a tip uncharacteristic of actual flaws.
width 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) Overlayfabricationflaws.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 (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 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 3 of 13
ATTACHMENT TO ENCLOSURE I PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX VilI, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS The rules of IWA-3300 shall be used to physical or visual access. physical or visual access.
detenmine 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.
(a)(l) A base grading unit shall include at (a)(l) A base metal grading unit shall (a)(J)A base metal grading unit includes least three inches of the length of the include at least one-inch of the length of the overlay material and the outer 25%
overlaid weld. The base grading unit the overlaid weld. The base metal grading of the original overlaid weld. The base includes the outer 25% of the overlaid weld unit includes the outer 25% of the overlaid metal grading unit shall extend and base metal on both sides. The base weld and base metal on both sides. The circumferentially for at least one-inch grading unit shall not include the inner base metal grading unit shall not include and shall start at the weld centerline and 75% of the overlaid weld and base metal the inner 75% of the overlaid weld and be wide enough in the axial direction to overlay material, or base metal-to-overlay base metal overlay material, or base metal- encompass one half of the original weld interface. to-overlay interface. crown and a minimum of 0.50 inches of the adjacent base materiaL (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 overlay fabrication grading unit. overlay fabrication grading unit.
one-inch of the crack location. This portion 4 of 13
ATTACHMENT TO ENCLOSURE I PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX Vill, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS of 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 one-inch of and base metal shall exist on all sides of the and base metal shall exist on all sides of the unflawed overlaid weld and base metal grading unit to preclude interfering grading unit to preclude interfering shall exist on either side of the base reflections from adjacent flaws. reflections from adjacent flaws.
grading unit. The segment of weld length used in one base grading unit shall not be used in another base grading unit. Base grading units need not be uniformly spaced around the 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 six-square- base metal-to-overlay interface for a length base metal-to-overlay interface for a length inches. The overlay grading unit shall be of at least one-inch. of at least one-inch.
rectangular, with minimum dimensions of two 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 one-inch around its entire perimeter. The one-inch at both ends. Sufficient unflawed one-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 both sides of the overlay fabrication grading unit. Overlay grading units need grading unit to preclude interfering grading unit to preclude interfering 5 of 13
ATTACHMENT TO ENCLOSURE 1 PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX Vill, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 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 baswmetal 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 qualification set is required. qualification set is required.
6f)
Sizing Specimen (1) The minimum number of flaws shall be (1) The minimum number of flaws shall be (1) The minimum number of flaws shall be ten. At least 30% 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 6of13
ENCLOSURE I PALISADES NUCLEAR PLANT REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX Vil, SUPPLEMENT 11 CODE REQUIREMENTS Paragraph 1.1(e)(2Xa)(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 one-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 one-inch, rather than the six-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 unflawed overlay material and unflawed base metal-to-overlay interface for at least one-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 PDI Program because it is redundant to the root-mean-squared (RMS) calculations performed in paragraph 3.2(c) and the presence of RMS 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.
These changes are contained in code case N-653. A comparison between the 1995 Edition and 1996 Addenda of Supplement 11, code case N-653, and the PDI Program is attached as supporting documentation. The first column identifies the code requirements, while the second (middle) column identifies the changes made by the code case.
There are, however, some additional changes that were inadvertently omitted from code case N-653. In paragraph 1.1(a)(1) the phrase "andbase metalon both sides"was inadvertently included in the description of a base metal grading unit. The PDI program intentionally excludes this requirement because some of 3
ENCLOSURE 1 PALISADES NUCLEAR PLANT REQUEST FOR RELIEF FROM ASME SECTION XI, APPENDIX VIII, SUPPLEMENT 11 CODE REQUIREMENTS 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 shag be alternative flaws" was added to the next to the last sentence in paragraph 1.1(d)(1). Additional editorial changes were made to the PDI program to address earlier requests for additional information from the NRC to other licensees (Southern Nuclear Company for the Edwin Hatch Nuclear Plant and Progress Energy Carolinas, Inc. for the Brunswick Steam Electric Plant).
The changes described above are identified by bold print in the third column of the enclosure.
PROPOSED ALTERNATIVE EXAMINATION NMC proposes that in lieu of the requirements of the ASME Section XI, BPV Code, 1995 Edition with the 1996 Addenda, Appendix VilI, Supplement 11, the PDI Program be used for examination requirements, as described in the attachment to this enclosure. This alternative provides an acceptable level of quality and safety.
CONCLUSION In summary, NMC is requesting relief from the requirements of Appendix Vil, Supplement 11, in order to utilize the PDI Program. Based on the information presented, and pursuant to 10 CFR 50.55a(aX3)(1), NMC requests approval for the proposed alternative on the basis that the alternative provides an acceptable level of quality and safety.
PERIOD FOR WHICH RELIEF IS REQUESTED NMC requests approval of the proposed alternative for the remainder of the third ten-year interval of the Inservice Inspection Program for Palisades, which is expected to conclude on December 12, 2006.
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A1TACHMENT TO ENCLOSURE I PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION XI, APPENDIX Vil, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 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. Sizing sets shall contain a sizing sets shall include the equivalent of distribution of flaw dimensions to assess three personnel qualification sets. To sizing capabilities. For initial procedure qualify new values of essential variables, at qualification, sizing sets shall include the least one personnel qualification set is equivalent of three personnel qualification required. sets. 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 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 a base metal flaw extends into the overlay overlay material by at least 0.1 inches in material by at least 0.1 inches in the the through-wall direction. through-wall direction.
2.0 CONDUCT OF PERFORMANCE DEMONSTRATION 7 of 13
ATTACHMENT TO ENCLOSURE 1 PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION XI. APPENDIX VIII, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS The specimen inside surface and The specimen inside surface and The specimen inside surface and identification shall be concealed from the identification shall be concealed from the identification shall be concealed from the candidate. All examinations shall be candidate. All examinations shall be candidate. All examinations shall be completed prior to grading the results and completed prior to grading the results and completed prior to grading the results and presenting the results to the candidate. presenting the results to the candidate. presenting the results to the candidate.
Divulgence of particular specimen results Divulgence of particular specimen results Divulgence of particular specimen results or candidate viewing of unmasked or candidate viewing of unmasked or candidate viewing of unmasked specimens after the performance specimens after the performance specimens after the performance demonstration is prohibited. demonstration is prohibited. The overlay demonstration is prohibited. The overlay fabrication flaw test and the base metal fabrication flaw test and the base metal flaw test may be performed separately. flaw test may be performed separately.
2.1 Detection Test.
Flawed and unflawed grading units shall 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 (a) The length sizing test may be conducted No Change 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 8 of 13
ATTACHMENT TO ENCLOSURE 1 PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX VIII, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENIC PIPING WELDS 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 For the depth sizing test, 80% of the flaws The candidate shall determine the depth of (a) The depth sizing test may be shall be sized at a specific location on the the flaw in each region. conducted separately or in conjunction surface of the specimen identified to the with the detection test.
candidate. For the remaining flaws, the regions of each specimen containing a flaw to be sized shall be identified to the candidate. The candidate shall determine the maximum depth of the flaw in each region.
9 of 13
ATTACHMENT TO ENCLOSURE I PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX VIII, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENMTIC PIPING WELDS (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.
4 +
(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.
10 of 13
ATTACHMENT TO ENCLOSURE I PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX Vil, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS l 3.0 ACCEPTANCE CRITERIA 3.1 Detection Acceptance Criteria.
Examination procedures, equipment, and Examination procedures are qualified for (a) Examination procedures are personnel are qualified for detection when detection when all flaws within the scope qualified for detection when; the results of the performance of the procedure are detected and the demonstration satisfy the acceptance results of the performance demonstration criteria of Table VIII-S2-l for both satisfy the acceptance criteria of Table detection and false calls. The criteria shall VIII-S2-1 for false calls. Examination be satisfied separately by the demonstration equipment and personnel are qualified for results for base grading units and for detection when the results of the overlay grading units. performance demonstration satisfy the acceptance criteria of Table VIII-S2-l for both detection and false calls. The criteria shall be satisfied separately by the demonstration results for base metal grading units and for overlay fabrication grading
_ units.
(1) All flaws within the scope of the procedure are detected and the results of the performance demonstration satisfy the acceptance criteria of Table VIII-S2-1 for false calls.
C2) At least one successful personnel demonstration has been performed 11 of 13
ATTACHMENT TO ENCLOSURE I PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi, APPENDIX Vil, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11 - QUALIFICATION CODE CASE N-653 PD1 PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 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 VII-S2-1 for both detection and false calls.
(c) The criteria In (a), (b) shall be satisfied separately by the demonstration results for base metal grading units and ..
for overlay fabrication grading units.
3.2 Sizing Acceptance Criteria.
Examination procedures, equipment, and No Change No Change personnel are qualified for sizing when the results ofthe 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.
(b) All extensions of base metal cracking This requirement is omitted. This requirement is omitted.
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ATTACHMENT TO ENCLOSURE 1 PALISADES NUCLEAR PLANT - REQUEST FOR RELIEF FROM ASME SECTION Xi APPENDIX VIII, SUPPLEMENT 11 CODE REQUIREMENT SUPPLEMENT 11- QUALIFICATION CODE CASE N-653 PDI PROGRAM:
REQUIREMENTS FOR FULL The Proposed Alternative to STRUCTURAL OVERLAID (Provided for Information Only) Supplement 11 Requirements WROUGHT AUSTENITIC PIPING WELDS 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.
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