NMP2L2700, Co. - Submittal of Proposed Alternative to Utilize Code Case N-879 for Plants
| ML19122A015 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs, Nine Mile Point, Byron, Three Mile Island, Braidwood, Limerick, Clinton, LaSalle  |
| Issue date: | 04/30/2019 |
| From: | Jim Barstow Exelon Generation Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19122A014 | List: |
| References | |
| NMP2L2700, RS-19-055, TMI-19-045 | |
| Download: ML19122A015 (39) | |
Text
PROPRIETARY INFORMATION-WITHHOLD UNDER 10 CFR 2.390 Exelon Generation© 200 Exelon Way Kennett Square, PA 193~
10 Ct-H 50.55a www.exeloncorp.com RS-19-055 NMP2L2700 TMl-19-045 April 30, 2019 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Braidwood Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-72 and NPF-77 NRG Docket Nos. STN 50-456 and STN 50-457 Byron Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-37 and NPF-66 NRG Docket Nos. STN 50-454 and STN 50-455 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRG Docket Nos. 50-317 and 50-318 Clinton Power Station, Unit 1 Facility Operating License No. NPF-62 NRC Docket No. 50-461 LaSalle County Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-11 and NPF-18 NRG Docket Nos. 50-373 and 50-374 Limerick Generating Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-39 and NPF-85 NRC Docket Nos. 50-352 and 50-353 Nine Mile Point Nuclear Station, Unit 2 Renewed Facility Operating License Nos. DPR-63 and NPF-69 NRC Docket Nos. 50-220 and 50-41 O Three Mile Island Nuclear Station, Unit 1 Renewed Facility Operating License No. DPR-50 NRC Docket No. 50-289
Subject:
Proposed Alternative to Utilize Code Case N-879 In accordance with 10 CFR 50.55a(z)(1 ), Exelon Generation Company, LLC (Exelon) is requesting a proposed alternative to the American Society of Mechanical Engineers (ASME)
Boiler and Pressure Vessel Code, Section XI, "Rules for lnservice Inspection of Nuclear Power Plant Components," on the basis that the proposed alternative provides an acceptable level of quality and safety, equivalent to compliance with ASME Section Ill and XI requirements.
Enclosures 1, 2, 3, 4, and 5 transmitted herewith contains Proprietary Information. When separated from attachments, this document is decontrolled.
Proposed Alternative to Utilize Code Case N-879 April 30, 2019 Page 2 Specifically, this proposed alternative concerns the use of Code Case N-879, "Use of Micro-Alloyed Carbon Steel Bar in Patented Mechanical Joints and Fittings, Classes 1, 2, and 3 Section Ill, Division 1." This Code Case permits use of a material that does not comply with the limitations on material specifications and grades mandated by ASME Section Ill, NB/NC/ND-2121 (a).
Enclosures 1, 2, 3, 4, and 5 contain information proprietary to Lokring Technology, LLC (Lokring). Lokring requests that these documents be withheld from public disclosure in accordance with 10 CFR 2.390(b)(4). Affidavits supporting this request are contained in each Enclosure.
There are no regulatory commitments contained in this letter. Exelon requests your review and approval of this fleet request by April 30, 2020.
If you have any questions, please contact Tom Loomis (610) 765-5510.
James Barstow Director - Licensing and Regulatory Affairs Exelon Generation Company, LLC
Attachment:
Proposed Alternative to Utilize Code Case N-879
Enclosures:
- 1) Affidavit and "Impact Test Results"
- 2) Affidavit and 'Welding Procedure and Qualification Record"
- 3) Affidavit and "Metallurgical Test Report
- 5) Affidavit and "Elevated Temperature Tensile Testing"
- 6) Exelon PowerPoint Presentation, Request for use of ASME Code Case N-879 for Exelon Nuclear Power Plants, January 23, 2019 cc: Regional Administrator - NRG Region I Regional Administrator - NRG Region Ill NRG Senior Resident Inspector- Braidwood Station NRG Senior Resident Inspector - Byron Station NRG Senior Resident Inspector - Calvert Cliffs Nuclear Power Plant NRG Senior Resident Inspector - Clinton Power Station NRG Senior Resident Inspector - LaSalle County Station NRG Senior Resident Inspector - Limerick Generating Station NRG Senior Resident Inspector - Nine Mile Point Nuclear Station NRG Senior Resident Inspector - Three Mile Island Nuclear Station NRG Project Manager - Braidwood Station NRG Project Manager - Byron Station NRG Project Manager - Calvert Cliffs Nuclear Power Plant NRG Project Manager - Clinton Power Station NRG Project Manager - LaSalle County Station
Proposed Alternative to Utilize Code Case N-879 April 30, 2019 Page 3 cc (continued):
NRC Project Manager - Limerick Generating Station NRC Project Manager - Nine Mile Point Nuclear Station NRC Project Manager - Three Mile Island Nuclear Station Illinois Emergency Management Agency - Department of Nuclear Safety R. R. Janati - Bureau of Radiation Protection, Commonwealth of Pennsylvania D. A. Tancabel - State of Maryland A. L. Peterson - NYSERDA
ATTACHMENT Proposed Alternative to Use Code Case N-879
10 CFR 50.55a RELIEF REQUEST Revision 0 (Page 1of6)
Proposed Alternative to Use Code Case N-879 in Accordance with 10 CFR 50.55a(z)(1)
- 1. ASME Code Component(s) Affected:
All ASME Class 2 and 3 carbon steel piping systems Nominal Pipe Size (NPS) 2 and smaller. Note that Case N-879 is also applicable to Class 1 piping; however, Exelon is not requesting permission to use Case N-879 for Class 1 fittings. This request applies only to Class 2 and 3 fittings.
- 2. Applicable ASME Section XI Edition and Addenda:
PLANT INTERVAL EDITION START END Braidwood Station, Units Fourth 2013 Edition August 29, 2018 July 28, 2028 1and2 November 5, 2018 October 16, 2028 Byron Station, Units Fourth 2007 Edition, through 2008 July 16, 2016 July 15, 2025 Addenda 1and2 Calvert Cliffs Nuclear Fifth 2013 Edition July 1, 2019 June 30, 2029 Power Plant, Units 1 and 2
Clinton Power Station, Third 2004 Edition July 1, 2010 June 30, 2020 Unit 1 Clinton Power Station, Fourth 2013 Edition July 1, 2020 June 30, 2030 Unit 1 LaSalle County Stations, Fourth 2007 Edition, through 2008 October 1, 2017 September 30, 2027 Units 1 and 2 Addenda Limerick Generating Fourth 2007 Edition, through 2008 February 1, 2017 January 31, 2027 Station, Units 1 and 2 Addenda Nine Mile Point Nuclear Fourth 2013 Edition October 6, 2018 August 22, 2028 Station, Unit 2 Three Mile Island Nuclear Fourth 2004 Edition April 20, 2011 April 19, 2022 Station, Unit 1
- 3. Applicable Code Requirements:
ASME Code, Section Ill, NC/ND-2121(a), of the 1971 Edition through the 2017 Edition, provides requirements for materials to be used in Class 2 and 3 piping systems. This requirement is mandated by IWA-4220, of the ASME Section XI Edition and Addenda applicable to each
10 CFR 50.55a RELIEF REQUEST Revision O (Page 2 of 6) nuclear power plant. Exelon has determined that relief is not needed from ASME Code 831.1 and 831.7.
4. Reason for Request
In accordance with 10 CFR 50.55a(z}(1), Exelon Generation Company, LLC (Exelon) is requesting a proposed alternative from the ASME Section Ill, NC/ND-2121 (a) requirements for compliance with the specifications for material given in ASME Section II, Part 0 (previously Section Ill, Division 1, Appendix I, Tables 1-1.1, 1-7.1, and 1-8.1 ), Subpart 1, Table 1A, for ferrous materials, on the basis that Code Case N-879 provides an acceptable level of quality and safety, equivalent to compliance with the requirements of ASME Section Ill, NC/N0-2121 (a) and Section II, Part 0 Subpart 1, Table 1A, for ferrous materials.
Exelon desires to use nonstandard, proprietary, welded, or nonwelded pipe fittings in applications requiring compliance with ASME Section Ill, without having to comply with the limitations on material specifications and grades mandated by Section Ill, NC/N0-2121(a).
Most piping fabrication and installation joints have been traditionally fabricated by welding.
Installation of pipe and piping subassemblies by mechanical means can save significant amounts of time, money, critical path time, and radiation exposure to plant personnel and installation and examination contractors. In systems containing radioactive materials, or in systems near irradiated components, personnel can be subjected to significant amounts of radiation during preparation for welding, during welding, and nondestructive examination (NOE) of the welds. Most of this exposure can be eliminated by use of mechanical connections. The amount of time to which mechanical installation personnel are exposed is a fraction of the time to which a welder or a nondestructive examiner would be exposed.
Without installation welds, there is no associated installation NOE.
- 5. Proposed Alternative and Basis for Use: 1 Exelon proposes to implement the requirements of Code Case N-879 for procurement of nonstandard, proprietary, welded and nonwelded pipe fittings, NPS 2 or smaller.
ASME Section XI requires fittings to be designed and manufactured in accordance with the original Construction Code, which, for these specific applications, is ASME Section Ill. The only ASME Code requirement for which Exelon is seeking an alternative is that of ASME Section Ill, NC/N0-2121 (a), which requires compliance with the specifications for material given in ASME Section II, Part 0 (previously Section Ill, Division 1, Appendix I, Tables 1-1.1, 1-7.1, and 1-8.1 ), Subpart 1, Table 1A, for ferrous materials.
The requested alternative is provided in Code Case N-879, "Use of Micro-Alloyed Carbon Steel Bar in Patented Mechanical Joints and Fittings, Classes 1, 2, and 3 Section Ill, Division 1,"
which permits use of a micro-alloyed steel composition similar to that of ASME SA-675 and ASTM A 576 Grade 1524, with additions of carbon, manganese, vanadium, and nitrogen, to increase the yield strength to 80 ksi, to ensure a high-strength, leak-tight, mechanical joint.
The material meets all other requirements of ASME Section II, Part A, SA-675. It has chemical composition similar to ASME SA-737, Grade C, which is approved for use in 1 Responds to NRG Question 4 (Reference 1).
10 CFR 50.SSa RELIEF REQUEST Revision O (Page 3 of 6)
ASME Section Ill applications. The additional material strength ensures that the deformation produced during installation of the fittings occurs in the pipe material, rather than in the fitting material. It is this deformation that produces the stresses necessary for the joint structural and leak-tight integrity.
This Code Case will expand Exelon's ability to use these proprietary fittings in safety-related piping, by including coverage for ASME Section Ill, Class 2 and 3 systems NPS 2 or smaller.
The material described in Code Case N-879 is already permitted to be used in safety-related pipe fittings manufactured in accordance with ASME B31.1, paragraph 123.1.2.
This material is also already permitted to be used in compression-type fittings in ASME Section Ill, Class 1, 2, and 3 instrument lines, up to NPS 1, in accordance with NB/NC/ND-2121, in the 1971 Edition through the 2017 Edition. However, for piping systems in nuclear power plants for which Section Ill was used for construction, the applicable material requirements in NB/NC/ND-2121 do not address, or specifically permit, use of this material in fittings other than instrument lines up to NPS 1.
Section Ill does not require fracture toughness testing for this material, because tubular products of the desired size are too small and too thin to make fracture toughness test specimens. Nonetheless, this material has been impact tested in bar form. The fracture toughness values are attached in Enclosure 1. The results demonstrate that fracture toughness testing is not necessary, and that the increase in hardness in the HAZ is minimal. Lokring imposes a maximum tensile strength of 130 ksi. 2 P-Numbers for welding procedure and performance qualification are normally provided by ASME Section IX. Because this material is not a standard product and is used only in limited applications, the Section IX committee has not been requested to provide a P-Number. Section IX, QW-420 identifies that P-Numbers are provided for the purpose of reducing the number of welding qualifications required, but are not necessary. Materials not having a P-Number are required to be qualified separately. Separate qualifications have been performed for this material welded to P-No. 1 piping materials, such as SA-106 Grade B. 3 The filler material is that most applicable to welding of SA-106 Grade B pipe, such as ER70. 4 Any welds will be preheated to 70°F and will not be post-weld heat treated.
Post-weld heat treatment (PWHT) is undesirable, as it decreases the yield strength to the point that the fittings would not be able to resist the compression forces necessary to produce a leak-tight joint. 5 A typical welding procedure and results of welding qualifications are shown in Enclosure 2. There is minimal heat-affected-zone hardening and no evidence of martensite formation in the HAZ. A metallurgical test report, with photomicrographs, is shown in Enclosure 3. HAZ hardness testing results are shown in Enclosure 4. Bend tests have been demonstrated to meet ASME Section IX requirements as shown in Enclosure 2.
The Section Ill Code Editions and Addenda used in constructing the Class 2 and 3 piping systems at Braidwood, Byron, Calvert Cliffs, Clinton, LaSalle, Limerick, Nine Mile Point Nuclear Station, Unit 2, and Three Mile Island, Unit 1 include primarily the Winter 1972 Addenda, the 2 Responds to NRC Question 5 (Reference 1).
3 Responds to NRC Question 8 (Reference 1).
4 Responds to NRC Question 7 (Reference 1).
5 Responds to NRC Question 6 (Reference 1).
10 CFR 50.55a RELIEF REQUEST Revision O (Page 4 of 6) 1974 Edition, including the Summer 1974 and Summer 1975 Addenda, and the 1977 Edition with the Summer 1978 and Summer 1979 Addenda. At Calvert Cliffs Nuclear Power Plant, Units 1 and 2, several new post-TMI modifications were designed to add systems constructed using the 1977 Edition of Section Ill, including the Summer 1978 Addenda. 6 Exelon desires to be able to install fittings made using the material permitted by Code Case N-879 for any application in which plain carbon steel materials, such as SA-106 Grade B are used, subject to the NPS 2 size limitation of Code Case N-879. However, the typical applications in which the subject proprietary fittings will be used are generally limited to instrumentation, sampling, and cooling water piping lines. They exclude Class 1 systems and any systems containing boric acid. Design temperatures may be up to 650°F, but will generally be less than 200°F. Design pressures could be as high as 1000 psi, but will generally be less than 200 psi. The environmental conditions are anything in the nuclear power plant environment, including air, water, or steam systems, and possibly lube oil or fuel systems. They could be inside or outside containment. Prior operating experience for these fittings in these environments have shown successful performance, with no leaks or structural failures, as long as they are installed in accordance with the manufacturer's instructions. They have been successfully used in pipe schedules from 1O to 160, subject to the manufacturer's recommendations and limitations.7 The material addressed in Code Case N-879 is somewhat unique in that it will be used in fittings designed and qualified by testing, rather than by calculating stresses. Due to the complex shape of the fittings, calculating stresses is not practical. For this reason, 831.1 and Section Ill contain provisions for proving the capability of such fittings by testing.
These requirements do not include design margins or load combinations based on allowable stresses. 8 Rather, the margins are based on the ratio between burst pressure and the design pressure of the coupled piping. The rated pressure is downrated from the burst pressure, based on elevated-temperature tensile testing. The results of these tests are shown in Enclosure 5.
The proprietary fittings that Exelon desires to use are typically designed in accordance with ASME Section Ill, NB-3671.7, "Sleeve Coupled and Other Patented Joints," using the option of prototype testing. Alternatively, NC/ND-3671.7 may be used for Class 2 or 3 fittings, as applicable. The fittings will also comply with similar requirements in ASME 831.1, paragraph 123.1.2.9 The fittings Exelon desires to use have been extensively tested by Exelon and Lokring to demonstrate that the fittings will not fail before the pipe on which they are installed. The fittings have been tested by tensile (pull-out) testing, pressurization to burst, fatigue testing, and torsion testing. Fatigue analysis is not required for the requested applications, but is performed for the purpose of establishing a stress intensification factor (SIF), for use by the piping system designer. 10 6 Responds to NRC Question 1 (Reference 1).
7 Responds to NRC Questions 2 and 4 (Reference 1).
8 Responds to NRC Question 10 (Reference 1).
9 Responds to NRC Question 9 (Reference 1).
10 Responds to NRC Question 10 (Reference 1).
10 CFR 50.55a RELIEF REQUEST Revision O (Page 5 of 6)
Reconciliation and use of editions and addenda of ASME Section Ill will be in accordance with ASME Section XI, IWA-4220, and only editions and addenda of ASME Section Ill that have been accepted by 10 CFR 50.55a may be used. The Code of Record for the specific 10-year ISi interval at each nuclear unit as identified under Section 2 above, will be used when applying the requirements of Section XI, unless specific regulatory relief to use other editions or addenda is approved.
All other ASME Section XI requirements for which relief was not specifically requested and authorized by the NRG Staff will remain applicable, including third party review by the Authorized Nuclear lnservice Inspector. All other Section Ill requirements, other than NC/ND-2121, will also remain applicable.
Based on the above, use of Code Case N-879 provides an acceptable level of quality and safety when compliance with the ASME Section Ill requirements for material given in ASME Section II, Part D (previously Section Ill, Division 1, Appendix I, Tables 1-1.1, 1-7.1, and 1-8.1 ),
Subpart 1, Table 1A, for ferrous materials are mandatory.
Code Case N-879 was approved by the ASME Board on Nuclear Codes and Standards on May 10, 2017, and was published in ASME Nuclear Code Cases, 2017 Edition, Supplement 1. It has not yet been incorporated into NRG Regulatory Guide 1.84, "Design, Fabrication, and Materials Code Case Acceptability, ASME Section Ill," and thus is not available for application at nuclear power plants without specific NRG approval. Therefore, Exelon requests use of the alternative material requirements described in this Code Case via this relief request.
In addition to the above-referenced documents, attached is the PowerPoint Presentation from the NRG-Exelon meeting on January 23, 2019 (Enclosure 6). 11
- 6. Duration of Proposed Alternative:
The proposed alternative is for use of the Code Case for the remainder of each plant's 10-year lnservice Inspection interval as specified in Section 2 and for the remainder of the plant's life.
- 7. Precedent:
None
- 8.
Enclosures:
- 1) Affidavit and "Impact Test Results"
- 2) Affidavit and 'Welding Procedure and Qualification Record"
- 3) Affidavit and "Metallurgical Test Reporf'
- 5) Affidavit and "Elevated Temperature Tensile Testing"
- 6) Exelon PowerPoint Presentation, "Request for Use of ASME Code Case N-879 for Exelon Nuclear Power Plants," January 23, 2019 (ML19022A200) 11 Responds to NRG Question 3 (Reference 1).
10 CFR 50.55a RELIEF REQUEST Revision O (Page 6 of 6)
- 9.
References:
- 1) Letter from 8. Purnell (U.S. Nuclear Regulatory Commission) to B. Hansen (Exelon Generation Company, LLC), Supplemental Information Needed for Acceptance of Requests to Use ASME Code Cases N-878, N-879, and N-880 (EPIDS L-2018-LLR-0076 and L-2018-LLR-0077), dated July 1O, 2018
ENCLOSURE 6 Exelon PowerPoint Presentation, Request for Use of ASME Code Case N-879 for Exelon Nuclear Power Plants," January 23, 2019(ML19022A200)
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Relief Request Scope/Subject Matter
- Requesting use of ASME Case N-879 for alternative material for use in Lokring Pipe Fittings for Class 2 and 3 Applications
- This request is for the material only - not for design, fabrication, or testing
- Case N-879 has been approved and published by ASME
- Published in ASME Nuclear Cases, 2017 Edition, Supplement 1
- Not yet generically endorsed in Reg. Guide 1.84
- Case N-879 material has micro-alloying elements (C, Mn, V, N) to enhance yield strength.
- Although containing extra alloying elements (Mn, V, N}, meets all other requirements in ASME Section Ill-approved material specification SA-675.
- N-879 material has a composition very similar to Pressure Vessel Plate Specification SA-737 Grade C (also approved for ASME Section Ill).
- Yield strength of 80 ksi is required, to confine installation deformation to pipe, rather than fitting.
- Specified properties ensure no leakage or separation of joint during service 2 *--* - - ---- -* -- ~ Exelon Generation ..
Existing AS ME Code Requirements
- ASME Section XI, IWA-4220 requires compliance with Construction Code requirements (or later Codes) for materials used in repair/replacement activities.
- For older plants, 831.1 is required
- Case N-879 material is permitted by 831.1 for these applications.
- 831.1 Case 164 or 831.1, 123.1.2, Unlisted Materials
- For newer plants, Section Ill is required
- NC/ND-2121 (a) requires materials selected from Section Ill, Appendix I or Section II, Part D.
- NC/ND-2121(d) permits use of other materials, such as Case N-879 material, for fittings up to NPS 1.
3 Exelon Generation .
Appl ications Currently Permitted
- Lokring fittings made from stainless steel materials are already permitted without restrictions.
- Lokring fittings made from micro-alloyed carbon steel material permitted by Case N-879 are already permitted by ASME 831.1.
- Therefore permitted to be used in safety-related service with no restrictions at
- Calvert Cliffs, Dresden, Fitzpatrick, Ginna, Nine Mile Point 1, Peach Bottom, Quad Cities, and TMI
- Lokring fittings made with Case N-879 material are already permitted in piping up to NPS 1, for all design conditions.
4 Exelon Generation ~
Relief Being Requested
- NRC acceptance of Case N-879 will permit use of micro-alloyed carbon steel material in Class 2 ahd 3 piping larger than NPS 1 and up to NPS 2 at
- Braidwood, Byron, Clinton, LaSalle, Limerick, Nine Mile Point 2 5 Exelon Generation ~
Hardship Reasons for Relief Request
- Safety hazards
- Welding and NOE in high-radiation environments Lokring mechanical installation - without welding or associated weld NOE - reduces radiation exposure and outage time.
- None of the carbon or low-alloy steel materials listed for Section Ill applications are suitable for both the service conditions and the Lokring installation conditions.
- The materials listed for Section Ill application do not have both of the following characteristics in combination.
- Similar chemistry to the pipe materials on which the fittings will be applied.
- Adequate yield strength to limit deformation to less than that of the pipe materials on which the fittings will be applied.
6 Exelon Generation ~
Responses to NRC Questions/Concerns
- Construction Code Editions and Addenda used:
- 831.1: 1965 through 1968
- Section Ill: 1971, 1974, S74, S75
- Some later Editions and Addenda for new or modified systems, such as TMI modifications at Calvert Cliffs
- Typically, instrumentation, sampling, cooling water piping
- Excludes borated systems (RCS, charging, chemical and volume control, etc.)
- Design temperature: ambient to 650°F
- Design pressure: -100 to -1000 psi
- Environment: air, water, or steam, inside or outside containment 7 Exelon Generation:
Responses to NRC Questions/Concerns Lokring Technology is a manufacturer of pipe and tube fittings developed and qualified for use in ASME 831 pressure piping systems
- Pipe Schedules 10, 40, 80, 160
Responses to NRC Questions/Concern s
- Description and drawing SEALING LANDS Diagram of In stalled and Sectioned Lokrin g Fitting/Pipe 9 Exelon Generation ~
Responses to NRC Questions/Concerns
- Description and drawing Fitting Body
- Plastically swaged onto pipe OD in order to Main Seal Anti-Torsion Seal(s) Inboard Seal *Middle sealing ring(s) create permanent (where equipped)
- First sealing ring
- Acldilional ~ealing and 360" seal
- Prevents pipe from
- Creates permanent, leak prevention rotaling helium leak light seal on Lhe pipe Outboard Seal
- Outermost sealing ring
- Additional sealing and leak prevention Tool Flange
/
- Installation tool grabs onto this to install the fitting Pipe Driver
.. C_reates an Elastic Strain Preload or spring load on the body 10 Exelon Generation ~
Responses to NRC Questions/Concerns
- Dimensions NOMINAL INSIDE DIAMETER OF f.tA TCHIMG PIPE
~
Tool Flange+
Drive Ring Tool Flange Tool Groove Tool Groove Outside +Drive Ring Outside Section Wall Tool Groove Fitting Size Diameter Length Diameter Thickness Length D2 X2 D1 t1 t1 NPS(DN) in (mm) in (mm) in (mm) in (mm) in (mm) 1/4 (8) 1.050 (26.7) 0.909 (23.1) 0.764 (19.4) 0.100 (2.5) 0.203 (5.2) 3/8 (10) 1.240 (31 .5) 1.012 (25.7) 0.830 (21.1) 0.068 (1.7) 0.203 (5.2) 1/2 (15) 1.460 (37.1) 1.080 (27.4) 1.004 (25.5) 0.068 (1.7) 0.203 (5.2) 3/4 (20) 1.600 (40.6) 1.212 (30.8) 1.235 (31.4) 0.079 (2.0) 0.278 (7 .1) 1 (25) 1.954 (49.6) 1.500 (38.1) 1.524 (38.7) 0.091 (2.3) 0.263 (6.7) 1-1/4 (32) 2.285 (58.0) 1.633 (41 .5) 1.813 (46.1) 0.062 (1.6) 0.273 (6.9) 1-1/2 (40) 2.610 (66.3) 1.795 (45.6) 2.064 (52.4) 0.068 (1.7) 0.283 (7.2) 2 (50) 3.250 (82.6) 2.203 (56.0) 2.574 (65.4) 0.075 (1.9) 0.303 (7.7) 11 Exelon Generation ~
Partial Application List - Exelon Installations - 2016 - 2018 Site Services in which Lokring Fittings are Installed #of Lokring Fittings Installed Braidwood
... Circulating water system small bore piping (1-inch) 4-inch vent line in diesel oil storage tank system
.. Service Building Chiller rerouting water lines above the chiller heads Aux Boiler modification for diesel line 202 Byron . Line replacement on WE in RH pump room Diesel Oil Storage Tank loop seal modification. Used to prevent the need for welding on diesel piping 20 LaSalle
..* 3-inch repair to exciter cooler service water piping SPE modification I line replacement 187 Quad Cities .. Generic EC for up to 2-inch non-safety pipe Upgrade drain line and vent lines for waste collector filter dome piping
.. Replace fuel poof filter demin dome drain valve Replace sight glass on line for HPCI draing going to RBEDT
. Replace piping associated with turbine bearing lift pump discharge bearing 5 RV & 7 RV 117
.. Reroute vent lines so travelling screen could be removed (TMod)
Reroute U-1 and U-2 reactor building sink outlets
. Offgas piping
. Gland water supply to circ pump Dresden EHC modification to install vertical pumps "A" Concentrator replacement 3A RFP casing replacement 347
. 3A IAC Replacement Feedwater Heater Drain Valves Clinton Nine Mile Point .* Scheduled to use on 2FP52A Fuel Line Replacement Feedwater and condensate system; used in three different applications 187 377
- EHC system isolation valves installed at turbine valves (1600 psi)
Oyster Creek
- Reactor Water clean up and Boiler system ~ 27
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Exelon Generation .,
Partial Application List - Non-Nuclear Applications lndustrv Year Work Descriotion Product (Pioe and Fittina Material and Size) Pressure Temoerature Steel Manufacturing 2005 6 Temper Mill Hydraulics CS, NPS 1/2 - NPS 3, Sch. 40 250-1000 psi Ambient Steel Manufacturing 1999 Hydraulics CS, Sch. 40/80 1500 psi Ambient Steel Manufacturing 2009 3000 - 5000 psi Hydraulics; high vibration NPS 2, Sch. 160 3000-5000 psi Steel Manufacturing 2009 Hydraulics CS & SS, NPS 1/2 through 2 1000 psi Refining 1999 Condensate Lines NPS 1, NPS 1-1/2, Sch. 80 2250 psi Ambient Petrochem 1999 Propylene NPS 1-1/2, Sch. 80 2068 kPa 100°c Offshore/Onshore 2007 Class 900 and Class 1500 RTJ flanges and couplings 1435 psi Pulp & Paper 1991 Hydraulic Fluid NPS 1-1/4, NPS 1-1/2, Sch. 40 1000 psi 200°F Chemical 1993 Lube Oil NPS 1-1/2, Sch. 80 1200-3500 psi Ambient Chemical 1991 Hydraulics NPS 3/4, Sch.40 1500 psi Ambient Chemical 2009 Natural Gas CS, NPS 1/2 3800 psi Ambient Petrochem 1997 - Paraxylene Unit and Ethylene Unit; 1/2" fittings installed in high NPS 1/2 - NPS 3 1450 psi 2009 vibration service in Ethylene Unit Product Compressors.
Automotive 1998 Sealer CS, NPS 2, Sch .160 3500 psi 125°F Railroad 2004 Hydraulic Lines on Equipment CS, A53 Seamless. NPS 1/2, NPS 1, Sch. 80 3000 psi Ambient Steel Manufacturing 1999 Hydraulics CS. NPS 'h - NPS 2, Sch. 40 3000 psi Ambient Petrochem 1998 Gas Dehydration NPS 1, NPS 1-1/2, NPS 2, Sch. 80 1500 psi 250°F Petrochem 1993 Hydrogen NPS 1-1/2 2400 psi Petrochem 1993 Hydrogen NPS 'h 2400 psi Ambient Petrochem 1992 Helium NPS 1/2, Sch. 40 2400 psi Ambient Pulp & Paper 1993 Hydraulic Oil NPS 1, Sch. 40 2500 psi 120°F Chemical 1999 Treated Boiler Feedwater NPS 1-1/2, Sch 80 1270 psi 400°F Chemical 1989 Hydraulics NPS 1-1/2, NPS 2 1200 psi Ambient CS =Carbon Steel SS = Stainless Steel 13 Exelon Generation.
Tensile Strength and Fracture Toughness
- Minimum tensile strength: 110 ksi
- Maximum tensile strength: 130 ksi
- Fracture toughness is difficult to determine, because material is too thin to obtain impact test specimens.
- Maximum thickness of Lokring fittings for use with NPS 2 Schedule 80 pipe is - 3/8 in.
- Impact testing is not required by 831.1.
- Impact testing is exempted by Section Ill, NC/ND-2311, based on section thickness< 5/8 in., and based on diameter< NPS 6.
~- --- --
14 Exelon Generation ~
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Welding Variables
- P-Number of Micro-alloyed, 80ksi Steel
- This material has no P-Number assigned by ASME.
- Separate Welding Procedure Qualification was performed using the micro-alloyed, 80ksi steel.
- Filler Material
- ER70, plain carbon steel, corresponding to the properties of the A 106 Grade B (or equivalent) pipe, tee, or elbow to which the Lokring fitting is attached.
- Preheat and Postweld Heat Treatment
- Preheat temperature is 70°F minimum.
- No PWHT is permitted, as it would degrade the required mechanical strength.
15 Exelon Generation _
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Welding Qualification Test Results
- PQR Test Results
- Tensile Strength 81 ksi
- Tensile specimen fracture was ductile and in the weld metal
- Procedure qualification base metal tensile strength is 114 ksi. Base metal hardness corresponds to 114 ksi. HAZ hardness with no preheat or PWHT corresponds to 124 ksi.
- Bend tests were acceptable.
17 Exelon Generation ~
Structural Integrity and Qualification Methods
- Lokring fittings, with Case N-879 material, have extensive testing and service expenence.
- Proven by testing in accordance with Section Ill, NC/ND-3671.7 and NC/ND-3649.
- Stress analysis is impractical, due to fitting configuration .
- Testing performed:
- Burst
- Fatigue
- Tensile (pull out)
- Torsion
- Vibration
- Extensive use in similar, but non-safety-related, service in multiple applications.
18 Exelon GenerationQ
Structural Integrity and Qualification Methods
- Burst Testing
- Lokring performs proof tests in accordance with ASME 816.9, MSS SP-97, or Section VIII, Division 1, UG-101, and Section 1
- Test per ASME 831 H Standard Method to Establish Maximum Allowable Pressure for Metallic Piping Components ASME 831 H-2015 (8-Sep-15 DRAFT) 19 Exelon Gen eration ~
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Structural Integrity and Qualification Methods Burst test specimen- MAS 3000 CAP P16 installed on ASTM A 106 B, A53 B, API 5L B schedule 80 21 Exelon Generation .
Structural Integrity and Qualification Methods
- Fatigue Testing
- Lokring performs proof tests in accordance with ASME 831.1 Section 119. 7.3 method to determine Flexibility and Stress Intensification Factors for components of piping systems
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Flexibility Factors Ck-Factors), and Their Determination for Metallic Piping Components M, -.,(1 l_)(..._'t._ ASME Cade for Pressure Piping, 831
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Structural Integrity and Qualification Methods A bending moment is created from the Hydraulic Cylinder and Bending Arm, which creates a moment in a plane passing through the neutral axis of the Pipe and Coupling specimen assembly. In one complete flexural cycle, the Pipe and Coupling specimen assembly bends an equal distance to either side of the neutral axis .
23 Exelon Generation .
Structural Integrity and Qualification Methods
- Vibration Testing
- Lokring performs proof tests in accordance with ASME BPVC, Section Ill Article NB-3200
- Experimental Stress Analysis Testing for the effects of Vibration (High Cycle, Low Amplitude) fatigue 24 Exelon Generation ~
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- Design Margins and Load Combinations are not relevant, because Lokring fittings are qualified by testing and have been demonstrated in accordance with Section Ill, NC/ND-3671.7 and NC/ND-3649 to be as good as 2: 1 socket welded joints.
- Cumulative Usage Factors are not applicable, because Lokring fittings made from Case N-879 material are used only in applications where fatigue analysis is not required.
- However, Lokring has conducted an extensive testing program to determine appropriate stress indices for its fittings, for use in the piping system design.
26 Exelon Generation J
Overall Summary
- Requesting use of ASME Case N-879 for alternative material for use in Lokring Pipe Fittings larger than NPS 1 and up to NPS 2.
- Extra alloying elements in CC N-879 Micro-Alloyed Carbon Steel Mat~rial, refine the grain size and significantly increase the tensile and yield strengths of the material while still maintaining acceptable ductility, toughness and corrosion resistance.
- Case N-879 has been approved and published by ASME.
- Case N-879 material is permitted by 831.1. NRC acceptance is not required for these applications.
- Case N-879 material is permitted by NC/ND-2121 (d) for fittings up to NPS
- 1. NRC has already accepted the Section Ill provisions that permit use of this material for this application.
- Lokring mechanical installation reduces radiation exposure and outage 21 ti-me. -- --- *.. ~ Exelon Generation _
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