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{{#Wiki_filter:This regulatory guide is being issued in draft form to involve the public in the early stages of the development of a regulator y position in this area. It has not received staff review or approval and does not represent an official NRC staff position.  
{{#Wiki_filter:U.S. NUCLEAR REGULATORY COMMISSION                                                  April 2009 OFFICE OF NUCLEAR REGULATORY RESEARCH                                                  Division 1 DRAFT REGULATORY GUIDE


Public comments are being solicited on this draft guide (including any implementation schedule) and its associated regulatory analysis or value/impact statement. Comments should be accompanied by appropriate supporting data. Written comments may be submitted to the Rulemaking, Directives, and Editing Branch, Office of Administration, U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001; e-mailed to nrcrep.resource@nrc.gov; submitted through the Federal e-rulemaking portal: http://www.regulations.gov or faxed to (301) 415-5144. Copies of comments received may be examined on http://regulation.gov or at the NRC's Public Document Room, 11555 Rockville Pike, Rockville, MD. Comments will be most helpful if received by xxxxxxxxxxxxx.
==Contact:==
Electronic copies of this draft regulatory guide are available on http://www.regulations.gov, the NRC's public Web site under Draft Regulatory Guides in the Regulatory Guides document collection of the NRC's Electronic Reading Room at http://www.nrc.gov/reading-rm/doc-collections/; and the NRC's Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html, under ML080920854.
W.E. Norris (301) 251-7650 DRAFT REGULATORY GUIDE DG-1193 (Proposed Revision 3 of Regulatory Guide 1.193, dated October 2007)
U.S. NUCLEAR REGULATORY COMMISSION              April 2009 OFFICE OF NUCLEAR REGULATORY RESEARCH        Division 1 DRAFT REGULATORY GUIDE Contact: W.E. Norris (301) 251-7650 DRAFT REGULATORY GUIDE DG-1193 (Proposed Revision 3 of Regulatory Guide 1.193, dated October 2007)
ASME CODE CASES NOT APPROVED FOR USE A. INTRODUCTION In Title 10, Part 50, of the Code of Federal Regulations (10 CFR Part 50), ADomestic Licensing of Production and Utilization Facilities@ (Ref. 1), Section 50.55a(c), AReactor Coolant Pressure Boundary,@
ASME CODE CASES NOT APPROVED FOR USE A. INTRODUCTION In Title 10, Part 50, of the Code of Federal Regulations (10 CFR Part 50), ADomestic Licensing of Production and Utilization Facilities
requires, in part, that components of the reactor coolant pressure boundary be designed, fabricated, erected, and tested in accordance with the requirements for Class 1 components of Section III, ARules for Construction of Nuclear Power Plant Components,@ of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (BPV) Code (Ref. 2) or equivalent quality standards. Section 50.55a(f), AInservice Testing Requirements,@ requires, in part, that Class 1, 2, and 3 components and their supports meet the requirements of the ASME Code for Operation and Maintenance of Nuclear Power Plants (OM Code) (Ref. 3) or equivalent quality standards. Finally, 10 CFR 50.55a(g),
@ (Ref. 1), Section 50.55a(c), AReactor Coolant Pressure Boundary,@ requires, in part, that components of the reactor coolant pressure boundary be designed, fabr icated, erected, and tested in accordance with the requirements for Class 1 components of Section III, ARules for Construction of Nuclear Power Plant Components,@ of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (BPV) Code (Ref. 2) or equivalent quality standards. Section 50.55a(f), AInservice Testing Requirements,@ requires, in part, that Class 1, 2, and 3 components and their supports meet the requirements of the ASME Code for Operation and Maintenance of Nuclear Power Plants (OM Code) (Ref. 3) or equivalent quality standards. Finally, 10 CFR 50.55a(g),
AInservice Inspection Requirements,@ requires, in part, that Class 1, 2, 3, MC (metal containment), and CC (concrete containment) components and their supports meet the requirements of Section XI, ARules for Inservice Inspection of Nuclear Power Plant Components,@ of the ASME BPV Code or equivalent quality standards.
AInservice Inspection Requirements,@ requires, in part, that Class 1, 2, 3, MC (metal containment), and CC (concrete containment) components and their supports meet the requirements of Section XI, ARules for Inservice Inspection of Nuclear Power Plant Components,@ of the ASME BPV Code or equivalent quality standards.  
The ASME publishes a new edition of the BPV and OM Codes every 3 years and new addenda every year. The latest editions and addenda of Section III, Section XI, and the OM Code that the U.S.
Nuclear Regulatory Commission (NRC) has approved for use by licensees are referenced in 10 CFR This regulatory guide is being issued in draft form to involve the public in the early stages of the development of a regulatory position in this area. It has not received staff review or approval and does not represent an official NRC staff position.
Public comments are being solicited on this draft guide (including any implementation schedule) and its associated regulatory analysis or value/impact statement. Comments should be accompanied by appropriate supporting data. Written comments may be submitted to the Rulemaking, Directives, and Editing Branch, Office of Administration, U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001; e-mailed to nrcrep.resource@nrc.gov; submitted through the Federal e-rulemaking portal: http://www.regulations.gov or faxed to (301) 415-5144. Copies of comments received may be examined on http://regulation.gov or at the NRCs Public Document Room, 11555 Rockville Pike, Rockville, MD. Comments will be most helpful if received by xxxxxxxxxxxxx.
Electronic copies of this draft regulatory guide are available on http://www.regulations.gov, the NRCs public Web site under Draft Regulatory Guides in the Regulatory Guides document collection of the NRCs Electronic Reading Room at http://www.nrc.gov/reading-rm/doc-collections/; and the NRCs Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html, under ML080920854.


The ASME publishes a new edition of the BPV and OM Codes every 3 years and new addenda every year. The latest editions and addenda of Section III, Section XI, and the OM Code that the U.S. Nuclear Regulatory Commission (NRC) has approved for use by licensees are referenced in 10 CFR DG-1193, Page 2 50.55a(b). The ASME also publishes Code Cases for Section III and Section XI quarterly and Code Cases for the OM Code yearly. Code Cases provide alternatives developed and approved by the ASME.  
50.55a(b). The ASME also publishes Code Cases for Section III and Section XI quarterly and Code Cases for the OM Code yearly. Code Cases provide alternatives developed and approved by the ASME.
The NRC staff has reviewed Section III and Section XI Code Cases listed in Supplements 2B11 to the 2004 Edition, and Supplement 0 to the 2007 Edition of the ASME BPV Code. It should be noted that Supplement 0 to the 2007 Edition also serves as Supplement 12 to the 2004 Edition. Draft Revision 35 of Regulatory Guide 1.84, ADesign, Fabrication, and Materials Code Case Acceptability, ASME Section III@ (Ref. 4), and Draft Revision 16 of Regulatory Guide 1.147, AInservice Inspection Code Case Acceptability, ASME Section XI, Division 1@ (Ref. 5), have been published concurrently with this guide to identify the Code Cases that the NRC has determined to be acceptable alternatives to applicable parts of Section III and Section XI. This regulatory guide does not approve the use of the Code Cases listed herein.
Because this regulatory guide does not approve the use of the Code Cases listed herein, it does not contain new or amended information collection requirements subject to the Paperwork Reduction Act of 1995 (Ref. 6). The NRC may neither conduct nor sponsor, and a person is not required to respond to, an information collection request or requirement unless the requesting document displays a currently valid control number issued by the Office of Management and Budget (OMB).
B. DISCUSSION This regulatory guide lists the Code Cases that the NRC has determined not to be acceptable for use on a generic basis. A brief description of the basis for the determination is provided with each Code Case. Licensees may submit a request to implement one or more of the Code Cases listed below through 10 CFR 50.55a(a)(3), which permits the use of alternatives to the Code requirements referenced in 10 CFR 50.55a, provided that the proposed alternatives result in an acceptable level of quality and safety. Licensees must submit a plant-specific request that addresses the NRC=s concerns about the Code Case at issue.
C. REGULATORY POSITION For this guide, the NRC reviewed the Section III and Section XI Code Cases listed in Supplements 2B11 to the 2004 Edition, and Supplement 0 to the 2007 Edition of the ASME BPV Code. Licensees may not implement Code Cases listed in this guide without prior NRC approval.
: 1.       Unacceptable Section III Code Cases The NRC determined that the following Section III Code Cases are unacceptable for use by licensees in their Section III design and construction programs.
DG-1193, Page 2


The NRC staff has reviewed Section III and Section XI Code Cases listed in Supplements 2 B 11 to the 2004 Edition, and Supplement 0 to the 2007 Edition of the ASME BPV Code. It should be noted that Supplement 0 to the 2007 Edition also serves as Supplement 12 to the 2004 Edition. Draft Revision 35 of Regulatory Guide 1.84, ADesign, Fabrication, and Materials Code Case Acceptability, ASME Section III@ (Ref. 4), and Draft Revision 16 of Regulatory Guide 1.147, AInservice Inspection Code Case Acceptability, ASME Section XI, Division 1
Table 1. Unacceptable Section III Code Cases Code Case                                    Table 1                                    Date or Number                    Unacceptable Section III Code Cases                       Supplement/
@ (Ref. 5), have been published concurrently with this guide to identify the Code Cases that the NRC has determined to be acceptable alternatives to applicable parts of Section III and Section XI. This regulatory guide does not approve the use of the Code Cases listed herein. Because this regulatory guide does not approve the use of the Code Cases listed herein, it does not contain new or amended information collection requirements subject to the Paperwork Reduction Act of 1995 (Ref. 6). The NRC may neither conduct nor sponsor, and a person is not required to respond to, an information collection request or requirement unless the requesting document displays a currently valid control number issued by the Office of Management and Budget (OMB).  
Edition Summary N-284-1    Metal Containment Shell Buckling Design Methods, Section III, Division          5/9/03 1, Class MC (1)  The following errata, misprints, recommendations, and errors have been identified:
Fig. 1511.1, The curve for L should not exceed 0.8 for any value of (R/t).
                  -1512, The statement ASee Fig. 1512-1 then see -1713.1.2 for method of calculating M@ should be rephrased as: ASee
                      -1713.1.2 for method of calculating M, then see Fig. -1512-1.@
                  -1513, Recommend AUse the value of il given for spherical shells in accordance with -1512.@
                  -1521, (i) In (a) Axial Compression, AG = L@ should be changed to AG = L.@ (ii) The source of the equations shown under A(a) Axial Compression@ provided separate instability equations for stringer-stiffened and ring-stiffened cylindrical shells. The Code Case adopted the instability equations pertaining to ring-stiffened shells, which are less conservative than those for stringer instability, for both ring and/or stringer stiffened cylindrical shells. Is this the intent? (Ref. 7).
                  -1712.1.1, The equation ACh = 0.92/(M - 0.636)@ should be changed to ACh = 0.92/(M - 0.636).@
                  -1712.1.1-1, The leftmost curve should be labeled Ch.
                  -1712.2.2, (a) Axial Compression, (i) In the formula for ej, the denominator should be (m/Lj)2 C t. (ii) The expressions for C and C should be separated.
                  -1712.2.3, (i) The factor 1.944 in an older edition has been changed to 2.00. No basis is apparent. (ii) The misprint At 13@
should be corrected to At13.@
                  -1713.1.1, (i) The equation Aa=Cel/FS@ should be changed to Aa=LCel/FS.@ (ii) The title of (c) should be changed to AAxial Compression Plus In-Plane Shear.@
                  -1713.1-1, In (b), the lower value AKs=ra@ on the vertical axis should be changed to AKs=ha.@
                  -1713.2.1, (i) The headings for (b) and (c) should include the words AIn-Plane.@ (ii) In (b) AAxial Compression Plus Shear,@
A@ should be changed to A.@
DG-1193, Page 3


B. DISCUSSION This regulatory guide lists the Code Cases that the NRC has determined not to be acceptable for use on a generic basis. A brief description of the basis for the determination is provided with each Code Case. Licensees may submit a request to implement one or more of the Code Cases listed below through 10 CFR 50.55a(a)(3), which permits the use of alternatives to the Code requirements referenced in 10 CFR 50.55a, provided that the proposed alternatives result in an acceptable level of quality and safety. Licensees must submit a plant-specific request that addresses the NRC
Code Case                                    Table 1                                      Date or Number                      Unacceptable Section III Code Cases                       Supplement/
=s concerns about the Code Case at issue.  
Edition Summary N-284-1    Metal Containment Shell Buckling Design Methods, Section III, Division          5/9/03 (contd)    1, Class MC (2)    Applicants intending to use Code Case N-284-1 shall submit a request to the NRC staff for its review and approval on a plant-specific basis.
(3)    The rules applicable to evaluate the buckling and instability of containment shells for Section III, Division 3, are under development. Currently, use of Code Case N-284-1 by licensees for storage canisters and transportation casks is permissible provided it has been reviewed and approved by the NRC N-483-2    Alternative Rules to the Provisions of NCA-3800, Requirements for               5/7/99 N-483-3    Purchase of Material, Section III, Divisions 1 and 3                            2/25/02 The Code Case lacks sufficient detail to ensure that the supplied material is as represented by the Certified Material Test Report.
N-510      Borated Stainless Steel for Class CS Core Support Structures and Class 1        12/9/93 N-510-1    Component Supports, Section III, Division 1                                    8/14/01 No technical basis was provided for expanding the Code Case to include borated stainless steel Types 304B, 304B1, 304B2, and 304B3. A considerable amount of information was required to support the types presently contained in the Code Case. The revised Code Case would permit borated stainless steel to be used for component supports within the reactor vessel. The technical basis to support the Code Case only addresses the use of these materials as component supports in spent fuel racks and transportation casks.
N-519      Use of 6061-T6 and 6061-T651 Aluminum for Class 1 Nuclear                    Annulled 2/3/03 Components Code Case is applicable to only one DOE aluminum vessel.
N-530      Provisions for Establishing Allowable Axial Compressive Membrane                2/3/03 Stresses in the Cylindrical Walls of 0-15 Psi Storage Tanks, Classes 2 and 3
There are numerous errors in the equations. The errors must be corrected before the Code Case can be approved for use.
DG-1193, Page 4


C. REGULATORY POSITION For this guide, the NRC reviewed the Section III and Section XI Code Cases listed in Supplements 2 B11 to the 2004 Edition, and Supplement 0 to the 2007 Edition of the ASME BPV Code. Licensees may not implement Code Cases listed in this guide without prior NRC approval.
Code Case                                    Table 1                                     Date or Number                     Unacceptable Section III Code Cases                       Supplement/
: 1. Unacceptable Section III Code Cases The NRC determined that the following Section III Code Cases are unacceptable for use by licensees in their Section III design and construction programs.
Edition Summary N-565      Alternative Methods of Nozzle Attachment for Class 1 Vessels                    12/3/99 The Code Case essentially requires a design using a seal to protect the threads from the contained fluid, and seals are not a Code item. The seal, which plays a very important part in the integrity of the joint, imposes too great a vulnerability in the design. The supporting information for the Code Case does not demonstrate the resulting threaded nozzle configuration is equivalent in integrity to that of a welded connection.
DG-1193, Page 3 Table 1. Unacceptable Section III Code Cases Code Case Number Table 1 Unacceptable Section III Code Cases Date or Supplement/ Edition Summary N-284-1 Metal Containment Shell Buckling Design Methods, Section III, Division 1, Class MC 5/9/03  (1) The following errata, misprints, recommendations, and errors have been identified:  Fig. 1511.1, The curve for L should not exceed 0.8 for any value of (R/t).  -1512, The statement ASee Fig. 1512-1 then see -1713.1.2 for method of calculating M
N-595      Requirements for Spent Fuel Storage Canisters, Section III, Division 1          2/26/99 N-595-1                                                                                     9/24/99 N-595-2                                                                                    12/8/00 N-595-3                                                                                    04/08/02 N-595-4                                                                                      2/04E Regulatory approval for the use of multi-purpose casks is presently addressed by the NRC Spent Fuel Project Office Interim Staff Guidance No. 4 (ISG-4), Rev. 1 (Ref. 8), and Interim Staff Guidance No. 18 (ISG-18), Rev. 1 (Ref. 13). The interim staff guidance provides a framework to ensure that the cask system, as designed, and when fabricated and used in accordance with the conditions specified in its Certificate of Compliance, meets the requirements of 10 CFR Part 72, ALicensing Requirements for the Independent Storage of Spent Nuclear Fuel, High-Level Radioactive Waste, and Reactor-Related Greater than Class C Waste@ (Ref. 9). It should be noted that Code Case N-717 replaces Code Case N-595-X.
@ should be rephrased as:
N-645      Use of Rupture Disk Devices on Nuclear Fuel Storage Canisters, Class 1,         6/14/00 N-645-1     Section III, Division 1                                                         2/3/03 The NRC does not permit the use of rupture disk devices in spent nuclear fuel storage canister designs.
A See -1713.1.2 for method of calculating M, then see Fig. -1512-1.
DG-1193, Page 5
@  -1513, Recommend AUse the value of il given for spherical shells in accordance with -1512.
@  -1521, (i) In (a) Axial Compression, AG = L@ should be changed to A G =  L.@  (ii) The source of the equations shown under A(a) Axial Compression
@ provided separate instability equations for stringer-stiffened and ring-stiffened cylindrical shells. The Code Case adopted the instability equations pertaining to ring-stiffened shells, which are less conservative than those for stringer instability, for both ring and/or stringer stiffened cylindrical shells. Is this the intent?  (Ref. 7).  -1712.1.1, The equation A Ch = 0.92/(M - 0.636)@ should be changed to A Ch = 0.92/(M - 0.636).
@  -1712.1.1-1, The leftmost curve should be labeled Ch.  -1712.2.2, (a) Axial Compression, (i) In the formula for  ej, the denominator should be (m/L j)2  t.  (ii) The expressions for C and C should be separated.  -1712.2.3, (i) The factor 1.944 in an older edition has been changed to 2.00. No basis is apparent. (ii) The misprint A t 1 3@ should be corrected to A t 1 3.@  -1713.1.1, (i) The equation A a=el/FS@ should be changed to A a=Lel/FS.@  (ii) The title of (c) should be changed to AAxial Compression Plus In-Plane Shear.
@  -1713.1-1, In (b), the lower value A K s= ra@ on the vertical axis should be changed to A K s= ha.@  -1713.2.1, (i) The headings for (b) and (c) should include the words A In-Plane.@ (ii) In (b)
AAxial Compression Plus Shear,@ A@ should be changed to A.@
DG-1193, Page 4 Code Case Number Table 1 Unacceptable Section III Code Cases Date or Supplement/ Edition  Summary  N-284-1 (cont'd) Metal Containment Shell Buckling Design Methods, Section III, Division 1, Class MC 5/9/03  (2) Applicants intending to use Code Case N-284-1 shall submit a request to the NRC staff for its review and approval on a plant-specific basis.
(3) The rules applicable to evaluate the buckling and instability of containment shells for Section III, Division 3, are under development. Currently, use of Code Case N-284-1 by licensees for storage canisters and transportation casks is permissible provided it has been reviewed and approved by the NRC N-483-2 N-483-3 Alternative Rules to the Provisions of NCA-3800, Requirements for Purchase of Material, Section III, Divisions 1 and 3 5/7/99 2/25/02  The Code Case lacks sufficient detail to ensure that the supplied material is as represented by the Certified Material Test Report.
N-510 N-510-1 Borated Stainless Steel for Class CS Core Support Structures and Class 1 Component Supports, Section III, Division 1 12/9/93 8/14/01  No technical basis was provided for expanding the Code Case to include borated stainless steel Types 304B, 304B1, 304B2, and 304B3. A considerable amount of information was required to support the types presently contained in the Code Case. The revised Code Case would permit borated stainless steel to be used for component supports within the reactor vessel. The technical basis to support the Code Case only addresses the use of these materials as component supports in spent fuel racks and transportation casks.
N-519 Use of 6061-T6 and 6061-T651 Aluminum for Class 1 Nuclear Components Annulled 2/3/03  Code Case is applicable to only one DOE aluminum vessel. N-530 Provisions for Establishing Allowable Axial Compressive Membrane Stresses in the Cylindrical Walls of 0-15 Psi Storage Tanks, Classes 2 and


3 2/3/03  There are numerous errors in the equations. The errors must be corrected before the Code Case can be approved for use.
Code Case                                   Table 1                                   Date or Number                     Unacceptable Section III Code Cases                     Supplement/
 
Edition Summary N-659       Use of Ultrasonic Examination in Lieu of Radiography for Weld                 9/17/02 N-659-1    Examination, Section III, Division 1                                         11/18/03 The NRC is not going to endorse Code Case N-659 or Code Case N-659-1 at this time given the number of issues raised by NRC staff and the concerns expressed in the public comments. The NRC has determined that a more effective approach for developing a suitable performance demonstration program would be to work with ASME International to resolve the issues.
DG-1193, Page 5 Code Case Number Table 1 Unacceptable Section III Code Cases Date or Supplement/ Edition  Summary  N-565 Alternative Methods of Nozzle Attachment for Class 1 Vessels 12/3/99  The Code Case essentially requires a design using a seal to protect the threads from the contained fluid, and seals are not a Code item. The seal, which plays a very important part in the integrity of the joint, imposes too great a vulnerability in the design. The supporting information for the Code Case does not demonstrate the resulting threaded nozzle configuration is equivalent in integrity to that of a welded connection.
Code Case N-659 was conditionally approved in Draft Regulatory Guide DG-1133 (proposed Revision 34 of Regulatory Guide 1.84), which was published for public comment on October 27, 2006 (71 FR 62947).
N-595 N-595-1 N-595-2 N-595-3 N-595-4 Requirements for Spent Fuel Storage Canisters, Section III, Division 1 2/26/99 9/24/99 12/8/00 04/08/02 2/04E  Regulatory approval for the use of multi-purpose casks is presently addressed by the NRC Spent Fuel Project Office Interim Staff Guidance No. 4 (ISG-4), Rev. 1 (Ref. 8), and Interim Staff Guidance No. 18 (ISG-18), Rev. 1 (Ref. 13). The interim staff guidance provides a framework to ensure that the cask system, as designed, and when fabricated and used in accordance with the conditions specified in its Certificate of Compliance, meets the requirements of 10 CFR Part 72, ALicensing Requirements for the Independent Storage of Spent Nuclear Fuel, High-Level Radioactive Waste, and Reactor-Related Greater than Class C Waste
Additional draft conditions were discussed in the statement of considerations for the proposed rule. Code Case N-659-1 was listed as unapproved in Draft Regulatory Guide DG-1135 (proposed Revision 2 to Regulatory Guide 1.193, AASME Code Cases Not Approved for Use@),
@ (Ref. 9). It should be noted that Code Case N-717 replaces Code Case N-595-X.
which was N-670       Use of Ductile Cast Iron Conforming to ASTM A 874/ A 874M-98 or JIS           6/04E G5504-1992 for Transport Containments, Section III, Division 3 The NRC has not yet endorsed Section III, Division 3, Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste. Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.
N-645 N-645-1 Use of Rupture Disk Devices on Nuclear Fuel Storage Canisters, Class 1, Section III, Division 1 6/14/00 2/3/03  The NRC does not permit the use of rupture disk devices in spent nuclear fuel storage canister designs.
N-673       Boron Containing Power Metallurgy Aluminum Alloy for Storage and               8/7/03 Transportation of Spent Nuclear Fuel, Section III, Division 1 The Code Case does not address the following:
 
(1) Corrosion properties of this material in spent fuel pool chemistry and/or clean water.
DG-1193, Page 6 Code Case Number Table 1 Unacceptable Section III Code Cases Date or Supplement/ Edition Summary N-659 N-659-1 Use of Ultrasonic Examination in Lieu of Radiography for Weld Examination, Section III, Division 1 9/17/02 11/18/03 The NRC is not going to endorse Code Case N-659 or Code Case N-659-1 at this time given the number of issues raised by NRC staff and the concerns expressed in the public comments. The NRC has determined that a more effective approach for developing a suitable performance demonstration program would be to work with ASME International to resolve the issues. Code Case N-659 was conditionally approved in Draft Regulatory Guide DG-1133 (proposed Revision 34 of Regulatory Guide 1.84), which was published for public comment on October 27, 2006 (71 FR 62947).
(2) Impact properties for use as a structural material.
Additional draft conditions were discussed in the statement of considerations for the proposed rule. Code Case N-659-1 was listed as unapproved in Draft Regulatory Guide DG-1135 (proposed Revision 2 to Regulatory Guide 1.193, AASME Code Cases Not Approved for Use
(3) Uniform distribution of boron carbide in the aluminum matrix.
@), which was N-670 Use of Ductile Cast Iron Conforming to ASTM A 874/ A 874M-98 or JIS G5504-1992 for Transport Containments, Section III, Division 3 6/04E  The NRC has not yet endorsed Section III, Division 3, "Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste."  Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.
(4) Mechanical properties for the use of the material in high-temperature conditions.
N-673 Boron Containing Power Metallurgy Aluminum Alloy for Storage and Transportation of Spent Nuclear Fuel, Section III, Division 1 8/7/03  The Code Case does not address the following: (1)   Corrosion properties of this material in spent fuel pool                     chemistry and/or clean water. (2)   Impact properties for use as a structural material.
DG-1193, Page 6
(3)   Uniform distribution of boron carbide in the aluminum matrix.
(4)   Mechanical properties for the use of the material in high-               temperature conditions.
 
DG-1193, Page 7 Code Case Number Table 1 Unacceptable Section III Code Cases Date or Supplement/ Edition  Summary  N-693 Alternative Method to the Requirements of NB-3228.6 for Analyzing Piping Subjected to Reversing Dynamic Load, Section III, Division 1 5/21/03  The Code Case would permit the use of the design, service, and test limits in Paragraph NB-3656(b) for Level D Service Limits. The limits in Paragraph NB-3656(b) are prohibited per 10 CFR 50.55a(b)(1)(iii).
N-707 Use of SA-537, Class 1 Plate Material for Spent-Fuel Containment Internals in Non-pressure Retaining Applications Above 700°F (370°C), Section III, Division 3 3/04E  The NRC has not yet endorsed Section III, Division 3, "Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste."  Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.
N-717 Requirements for Construction of Storage Containments for Spent Nuclear Fuel and High Level Radioactive Waste and Material,        Section III, Division 3 5/04/4  The NRC has not yet endorsed Section III, Division 3, "Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste."  Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.


Code Case                                  Table 1                                    Date or Number                    Unacceptable Section III Code Cases                      Supplement/
Edition Summary N-693      Alternative Method to the Requirements of NB-3228.6 for Analyzing            5/21/03 Piping Subjected to Reversing Dynamic Load, Section III, Division 1 The Code Case would permit the use of the design, service, and test limits in Paragraph NB-3656(b) for Level D Service Limits. The limits in Paragraph NB-3656(b) are prohibited per 10 CFR 50.55a(b)(1)(iii).
N-707      Use of SA-537, Class 1 Plate Material for Spent-Fuel Containment              3/04E Internals in Non-pressure Retaining Applications Above 700°F (370°C),
Section III, Division 3 The NRC has not yet endorsed Section III, Division 3, Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste. Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.
N-717      Requirements for Construction of Storage Containments for Spent              5/04/4 Nuclear Fuel and High Level Radioactive Waste and Material, Section III, Division 3 The NRC has not yet endorsed Section III, Division 3, Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste. Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.
The provisions of the Code Case are copied from the July 1, 2005, addenda to Section III, Division 3. The changes to the ASME Code contained in the addenda are scheduled to be reviewed by the NRC staff in FY 2009. The Code Case is listed in this guide pending the results of the NRC staff review.
The provisions of the Code Case are copied from the July 1, 2005, addenda to Section III, Division 3. The changes to the ASME Code contained in the addenda are scheduled to be reviewed by the NRC staff in FY 2009. The Code Case is listed in this guide pending the results of the NRC staff review.
N-728 Use of ASTM B 932-04 Plate Material for Nonpressure Retaining Spent Fuel Containment Internals to 650°F (343°C), Section III, Division 3 7/04E  The NRC has not yet endorsed Section III, Division 3, "Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste."  Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.  
N-728       Use of ASTM B 932-04 Plate Material for Nonpressure Retaining Spent           7/04E Fuel Containment Internals to 650°F (343°C), Section III, Division 3 The NRC has not yet endorsed Section III, Division 3, Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste. Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.
 
DG-1193, Page 7
DG-1193, Page 8 2. Unacceptable Section XI Code Cases The NRC determined that the following Section XI Code Cases are unacceptable for use by licensees in their Section XI inservice inspection programs.  
: 2.     Unacceptable Section XI Code Cases The NRC determined that the following Section XI Code Cases are unacceptable for use by licensees in their Section XI inservice inspection programs.
 
Table 2. Unacceptable Section XI Code Cases Code Case                                         Table 2                                 Date or Number                          Unacceptable Section XI Code Cases                     Supplement/
Table 2. Unacceptable Section XI Code Cases Code Case Number Table 2 Unacceptable Section XI Code Cases Date or Supplement/ Edition Summary N-465 N-465-1 Alternative Rules for Pump Testing, Section XI, Division 1 11/30/88 Annulled 2/14/03 The draft standard referenced in the Code Case is outdated. The requirements contained in the OM Code, ACode for Operation and Maintenance of Nuclear Power Plants,@ should be used. Note that Revision 12 of Regulatory Guide 1.147 (Ref. 5) approved N-465 for use.
Edition Summary N-465             Alternative Rules for Pump Testing, Section XI, Division 1                 11/30/88 N-465-1                                                                                      Annulled 2/14/03 The draft standard referenced in the Code Case is outdated.
The requirements contained in the OM Code, ACode for Operation and Maintenance of Nuclear Power Plants,@ should be used. Note that Revision 12 of Regulatory Guide 1.147 (Ref. 5) approved N-465 for use.
The disapproval of N-465 for use applies only to new users.
The disapproval of N-465 for use applies only to new users.
N-473 N-473-1 Alternative Rules for Valve Testing, Section XI, Division 1 3/8/89 Annulled 2/14/03 The draft standard referenced in the Code Case is outdated. The requirements contained in the OM Code, ACode for Operation and Maintenance of Nuclear Power Plants,@ should be used. Note that Revision 12 of Regulatory Guide 1.147 (Ref. 5) approved N-473 for use.
N-473             Alternative Rules for Valve Testing, Section XI, Division 1                 3/8/89 N-473-1                                                                                      Annulled 2/14/03 The draft standard referenced in the Code Case is outdated.
The requirements contained in the OM Code, ACode for Operation and Maintenance of Nuclear Power Plants,@ should be used. Note that Revision 12 of Regulatory Guide 1.147 (Ref. 5) approved N-473 for use.
The disapproval of N-473 for use applies only to new users.
The disapproval of N-473 for use applies only to new users.
N-480 Examination Requirements for Pipe Wall Thinning Due to Single Phase Erosion and Corrosion, Section XI, Division 1 Annulled 9/18/01 Code Case has been superseded by Code Case N-597, ARequirements for Analytical Evaluation of Pipe Wall Thinning,@ implemented in conjunction with NSAC-202L, ARecommendations for an Effective Flow-Accelerated Corrosion Program
N-480             Examination Requirements for Pipe Wall Thinning Due to Single Phase       Annulled Erosion and Corrosion, Section XI, Division 1                               9/18/01 Code Case has been superseded by Code Case N-597, ARequirements for Analytical Evaluation of Pipe Wall Thinning,@ implemented in conjunction with NSAC-202L, ARecommendations for an Effective Flow-Accelerated Corrosion Program@ (Ref. 10).
@ (Ref. 10).
N-498-2           Alternative Requirements for 10-Year System Hydrostatic Testing             6/9/95 N-498-3            for Class 1, 2, and 3 Systems, Section XI, Division 1                       5/20/98 Code Case N-498-4 is conditionally approved in Revision 13 of Regulatory Guide 1.147 (Ref. 5). Those licensees choosing to implement this Code Case are to implement Revision 4, which is listed in Revision 15 of Regulatory Guide 1.147.
N-498-2 N-498-3 Alternative Requirements for 10-Year System Hydrostatic Testing for Class 1, 2, and 3 Systems, Section XI, Division 1 6/9/95 5/20/98 Code Case N-498-4 is conditionally approved in Revision 13 of Regulatory Guide 1.147 (Ref. 5). Those licensees choosing to implement this Code Case are to implement Revision 4, which is listed in Revision 15 of Regulatory Guide 1.147.  
DG-1193, Page 8


DG-1193, Page 9 Code Case Number Table 2 Unacceptable Section XI Code Cases Date or Supplement/ Edition Summary N-532-2 Alternative Requirements to Repair and Replacement Documentation Requirements and Inservice Summary Report Preparation and Submission as Requested by IWA-4000 and IWA-6000, Section XI, Division 1 7/23/02  The following concerns were identified during review of the Code Case:
Code Case                                   Table 2                                     Date or Number                    Unacceptable Section XI Code Cases                       Supplement/
Edition Summary N-532-2   Alternative Requirements to Repair and Replacement Documentation               7/23/02 Requirements and Inservice Summary Report Preparation and Submission as Requested by IWA-4000 and IWA-6000, Section XI, Division 1 The following concerns were identified during review of the Code Case:
(1) The Code Case references new paragraph IWA-6350, which has not yet been incorporated into the ASME Code.
(1) The Code Case references new paragraph IWA-6350, which has not yet been incorporated into the ASME Code.
(2) NRC staff had difficulty reconciling Footnote 1 and Table 4 regarding the applicable edition and addenda. (3) Submission of Form OAR-1 is at the end of each inspection           period, rather than 90 days following the outage.
(2) NRC staff had difficulty reconciling Footnote 1 and Table 4 regarding the applicable edition and addenda.
N-542 Alternative Requirements for Nozzle Inside Radius Section Length Sizing Performance Demonstration, Section XI, Division 1 Annulled 3/28/01 Code Case N-542 was subsumed by Code Case N-552, AAlternative Methods BQualification for Nozzle Inside Radius Section from the Outside Surface,@ which is being implemented by licensees. Thus, there is no need to approve Code Case N-542.
(3) Submission of Form OAR-1 is at the end of each inspection period, rather than 90 days following the outage.
N-547 Alternative Examination Requirements for Pressure Retaining Bolting of Control Rod Drive (CRD) Housings, Section XI, Division 1 Annulled 5/20/01 Code Case N B547 states that the examination of CRD housing bolts, studs, and nuts is not required. However, 10 CFR 50.55a(b)(2)(xxi)(B) requires the examination of CRD bolting material whenever the CRD housing is disassembled and the bolting material is to be reused.
N-542     Alternative Requirements for Nozzle Inside Radius Section Length Sizing       Annulled Performance Demonstration, Section XI, Division 1                             3/28/01 Code Case N-542 was subsumed by Code Case N-552, AAlternative MethodsBQualification for Nozzle Inside Radius Section from the Outside Surface,@ which is being implemented by licensees.
Thus, there is no need to approve Code Case N-542.
N-547     Alternative Examination Requirements for Pressure Retaining Bolting of         Annulled Control Rod Drive (CRD) Housings, Section XI, Division 1                       5/20/01 Code Case NB547 states that the examination of CRD housing bolts, studs, and nuts is not required. However, 10 CFR 50.55a(b)(2)(xxi)(B) requires the examination of CRD bolting material whenever the CRD housing is disassembled and the bolting material is to be reused.
Examination of CRD bolting material is required to verify that service-related degradation has not occurred, or that damage such as bending and galling of threads has not occurred when performing maintenance activities that require the removal and reinstallation of bolting.
Examination of CRD bolting material is required to verify that service-related degradation has not occurred, or that damage such as bending and galling of threads has not occurred when performing maintenance activities that require the removal and reinstallation of bolting.
N-560 N-560-1 N-560-2 Alternative Examination Requirements for Class 1, Category B-J Piping Welds, Section XI, Division 1 8/9/96 2/26/99 2/14/03 (1) The Code Case does not address inspection strategy for existing augmented and other inspection programs such as intergranular stress corrosion cracking (IGSCC), flow-assisted corrosion (FAC),
N-560     Alternative Examination Requirements for Class 1, Category B-J Piping           8/9/96 N-560-1    Welds, Section XI, Division 1                                                 2/26/99 N-560-2                                                                                  2/14/03 (1) The Code Case does not address inspection strategy for existing augmented and other inspection programs such as intergranular stress corrosion cracking (IGSCC), flow-assisted corrosion (FAC),
microbiological corrosion (MIC), and pitting.
microbiological corrosion (MIC), and pitting.
(2) The Code Case does not provide system-level guidelines for change in risk evaluation to ensure that the risk from individual system failures will be kept small and dominant risk contributors will not be  
(2) The Code Case does not provide system-level guidelines for change in risk evaluation to ensure that the risk from individual system failures will be kept small and dominant risk contributors will not be created.
DG-1193, Page 9


created.
Code Case                                     Table 2                                     Date or Number                    Unacceptable Section XI Code Cases                         Supplement/
DG-1193, Page 10 Code Case Number Table 2 Unacceptable Section XI Code Cases Date or Supplement/ Edition Summary N-561 N-561-1 Alternative Requirements for Wall Thickness Restoration of Class 2 and High Energy Class 3 Carbon Steel Piping, Section XI, Division 1 12/31/96 3/28/01 Neither the ASME Code nor the Code Case have criteria for determining the rate or extent of degradation of the repair or the surrounding base metal. Reinspection requirements are not provided to verify structural integrity since the root cause may not be mitigated.
Edition Summary N-561     Alternative Requirements for Wall Thickness Restoration of Class 2 and           12/31/96 N-561-1    High Energy Class 3 Carbon Steel Piping, Section XI, Division 1                   3/28/01 Neither the ASME Code nor the Code Case have criteria for determining the rate or extent of degradation of the repair or the surrounding base metal. Reinspection requirements are not provided to verify structural integrity since the root cause may not be mitigated.
N-562 N-562-1 Alternative Requirements for Wall Thickness Restoration of Class 3 Moderate Energy Carbon Steel Piping, Section XI, Division 1 12/31/96 3/28/01 Neither the ASME Code nor the Code Case have criteria for determining the rate or extent of degradation of the repair or the surrounding base metal. Reinspection requirements are not provided to verify structural integrity since the root cause may not be mitigated.
N-562     Alternative Requirements for Wall Thickness Restoration of Class 3               12/31/96 N-562-1    Moderate Energy Carbon Steel Piping, Section XI, Division 1                 3/28/01 Neither the ASME Code nor the Code Case have criteria for determining the rate or extent of degradation of the repair or the surrounding base metal. Reinspection requirements are not provided to verify structural integrity since the root cause may not be mitigated.
N-574 NDE Personnel Recertification Frequency, Section XI, Division 1 Annulled 7/14/06 Based on data obtained by the NRC staff during its review of Appendix VIII, APerformance Demonstration for Ultrasonic Examination Systems,@ to Section XI, the NRC staff noted that proficiency decreases over time. The data do not support recertification examinations at a frequency of every 5 years.
N-574     NDE Personnel Recertification Frequency, Section XI, Division 1                 Annulled 7/14/06 Based on data obtained by the NRC staff during its review of Appendix VIII, APerformance Demonstration for Ultrasonic Examination Systems,@ to Section XI, the NRC staff noted that proficiency decreases over time. The data do not support recertification examinations at a frequency of every 5 years.
N-575 Alternative Examination Requirements for Full Penetration Nozzle-to-Vessel Welds in Reactor Vessels with Set-On Type Nozzles, Section XI, Division 1 2/14/03  The supporting basis for the Code Case applies to the specific configuration of one plant and is not applicable on a generic basis.
N-575     Alternative Examination Requirements for Full Penetration                         2/14/03 Nozzle-to-Vessel Welds in Reactor Vessels with Set-On Type Nozzles, Section XI, Division 1 The supporting basis for the Code Case applies to the specific configuration of one plant and is not applicable on a generic basis.
In addition, there are insufficient controls on stress and operating conditions to permit a generic reduction in examination volume. Finally, the boundaries of the volume of the weld, cladding, and heat affected zone from Figure 2 are ambiguous.
In addition, there are insufficient controls on stress and operating conditions to permit a generic reduction in examination volume. Finally, the boundaries of the volume of the weld, cladding, and heat affected zone from Figure 2 are ambiguous.
N-577 N-577-1 Risk-Informed Requirements for Class 1, 2, and 3 Piping, Method A, Section XI, Division 1 9/2/97 2/14/03   (1) The Code Case does not address inspection strategy for existing augmented and other inspection programs such as IGSCC, FAC, MIC, and pitting.
N-577     Risk-Informed Requirements for Class 1, 2, and 3 Piping, Method A,                 9/2/97 N-577-1    Section XI, Division 1                                                           2/14/03 (1) The Code Case does not address inspection strategy for existing augmented and other inspection programs such as IGSCC, FAC, MIC, and pitting.
(2) The Code Case does not provide system-level guidelines for change in risk evaluation to ensure that the risk from individual system failures will be kept small and dominant risk contributors will not be  
(2) The Code Case does not provide system-level guidelines for change in risk evaluation to ensure that the risk from individual system failures will be kept small and dominant risk contributors will not be created.
DG-1193, Page 10


created.
Code Case                                     Table 2                                     Date or Number                    Unacceptable Section XI Code Cases                         Supplement/
DG-1193, Page 11 Code Case Number Table 2 Unacceptable Section XI Code Cases Date or Supplement/ Edition Summary N-578 N-578-1 Risk-Informed Requirements for Class 1, 2, and 3 Piping, Method B, Section XI, Division 1 9/2/97 2/14/03   (1) The Code Case does not address inspection strategy for existing augmented and other inspection programs such as IGSCC, FAC, MIC, and pitting.
Edition Summary N-578     Risk-Informed Requirements for Class 1, 2, and 3 Piping, Method B,               9/2/97 N-578-1    Section XI, Division 1                                                         2/14/03 (1) The Code Case does not address inspection strategy for existing augmented and other inspection programs such as IGSCC, FAC, MIC, and pitting.
(2) The Code Case does not provide system-level guidelines for change in risk evaluation to ensure that the risk from individual system failures will be kept small and dominant risk contributors will not be  
(2) The Code Case does not provide system-level guidelines for change in risk evaluation to ensure that the risk from individual system failures will be kept small and dominant risk contributors will not be created.
 
N-587     Alternative NDE Requirements for Repair/Replacement Activities,                 Annulled Section XI, Division 1                                                         2/14/03 The NRC believes this Code Case is in conflict with the review process for approval of alternatives under 10 CFR 50.55a(a)(3). The Code Case would permit a licensee and the Authorized Nuclear Inspector to choose unspecified alternatives to regulatory requirements.
created. N-587 Alternative NDE Requirements for Repair/Replacement Activities, Section XI, Division 1 Annulled 2/14/03 The NRC believes this Code Case is in conflict with the review process for approval of alternatives under 10 CFR 50.55a(a)(3). The Code Case would permit a licensee and the Authorized Nuclear Inspector to choose unspecified alternatives to regulatory requirements.
N-589     Class 3 Nonmetallic Cured-in-Place Piping, Section XI,                         4/19/02 N-589-1    Division 1                                                                      7/23/02 (1) The installation process provides insufficient controls on wall thickness measurement.
N-589 N-589-1 Class 3 Nonmetallic Cured-in-Place Piping, Section XI, Division 1 4/19/02 7/23/02   (1) The installation process provides insufficient controls on wall thickness measurement.
(2) There are no qualification requirements for installers and installation procedures such as those for welders and welding procedures.
(2) There are no qualification requirements for installers and installation procedures such as those for welders and welding procedures.
(3) Fracture toughness properties of the fiberglass are such that the cured-in-place piping (CIPP) could crack during a seismic event.
(3) Fracture toughness properties of the fiberglass are such that the cured-in-place piping (CIPP) could crack during a seismic event.
(4) Equations 4 and 5 in the Code Case contain an Ai@ term [a stress intensification factor] that is derived from fatigue considerations.
(4) Equations 4 and 5 in the Code Case contain an A i@ term [a stress intensification factor] that is derived from fatigue considerations.
Stress intensification factors, however, have not been developed for fiberglass materials.
Stress intensification factors, however, have not been developed for fiberglass materials.
N-590 Alternative to the Requirements of Subsection IWE, Requirements for Class MC and Metallic Liners of Class CC Components of Light-Water Cooled Plants, Section XI, Division 1 Annulled 4/8/02 The provisions of the Code Case were incorporated into the 1998 Edition, which has been approved by the NRC. Thus, the Code Case is no longer needed and was annulled by the ASME.  
N-590     Alternative to the Requirements of Subsection IWE, Requirements             Annulled 4/8/02 for Class MC and Metallic Liners of Class CC Components of Light-Water Cooled Plants, Section XI, Division 1 The provisions of the Code Case were incorporated into the 1998 Edition, which has been approved by the NRC. Thus, the Code Case is no longer needed and was annulled by the ASME.
DG-1193, Page 11


DG-1193, Page 12 Code Case Number Table 2 Unacceptable Section XI Code Cases Date or Supplement/ Edition Summary N-591 Alternative to the Requirements of Subsection IWL, Requirements for Class CC Concrete Components of Light-Water Cooled Plants, Section XI, Division 1 Annulled 4/8/02 The provisions of the Code Case were incorporated into the 1998 Edition which has been approved by the NRC. Thus, the Code Case is no longer needed and was annulled by the ASME.
Code Case                                   Table 2                                   Date or Number                    Unacceptable Section XI Code Cases                       Supplement/
N-593-1 Examination Requirements for Steam Generator Nozzle-to-Vessel Welds, Section XI, Division 1 3/04E  The Code Case eliminates the requirement to examine the steam generator nozzle inner radius. Specifically, the examination volume for the nozzle inner radius was removed from Section XI, Figures IWB-2500-7(a) through IWB-2500-7(d). The action is applicable from the 1974 Edition through the 2004 Edition with 2005 Addenda. A similar action was taken regarding Code Case N-619. The NRC did not take exception to Code Case N-619 because 10 CFR 50.55a(b)(2)(xxi)(A) requires licensees to perform the examination in accordance with the 1998 Edition, which includes figures containing the examination volume. However, Code Case N-593-1 applies to editions prior to the 1998 Edition which do not have the appropriate figures.
Edition Summary N-591     Alternative to the Requirements of Subsection IWL, Requirements for       Annulled 4/8/02 Class CC Concrete Components of Light-Water Cooled Plants, Section XI, Division 1 The provisions of the Code Case were incorporated into the 1998 Edition which has been approved by the NRC. Thus, the Code Case is no longer needed and was annulled by the ASME.
N-613 Ultrasonic Examination of Full Penetration Nozzles in Vessels, Examination Category B-D, Item No
N-593-1   Examination Requirements for Steam Generator Nozzle-to-Vessel Welds,         3/04E Section XI, Division 1 The Code Case eliminates the requirement to examine the steam generator nozzle inner radius. Specifically, the examination volume for the nozzle inner radius was removed from Section XI, Figures IWB-2500-7(a) through IWB-2500-7(d). The action is applicable from the 1974 Edition through the 2004 Edition with 2005 Addenda. A similar action was taken regarding Code Case N-619. The NRC did not take exception to Code Case N-619 because 10 CFR 50.55a(b)(2)(xxi)(A) requires licensees to perform the examination in accordance with the 1998 Edition, which includes figures containing the examination volume. However, Code Case N-593-1 applies to editions prior to the 1998 Edition which do not have the appropriate figures.
=s. B3.10 and B3.90, Reactor Vessel-To-Nozzle Welds, Fig. IWB-2500-7(a), (b), and (c), Section XI, Division 1 7/30/98  The Code Case conflicts with and unacceptably reduces the requirements of 10 CFR 50.55a(b)(2)(xv)(K)(2)(i). A revision to the Code Case has been developed to address the concerns.
N-613     Ultrasonic Examination of Full Penetration Nozzles in Vessels,               7/30/98 Examination Category B-D, Item No=s. B3.10 and B3.90, Reactor Vessel-To-Nozzle Welds, Fig. IWB-2500-7(a), (b), and (c), Section XI, Division 1 The Code Case conflicts with and unacceptably reduces the requirements of 10 CFR 50.55a(b)(2)(xv)(K)(2)(i). A revision to the Code Case has been developed to address the concerns.
N-615 Ultrasonic Examination as a Surface Examination Method for Category B-F and B-J Piping Welds, Section XI, Division 1 7/28/01  The Code Case requires that the ultrasonic technique used be demonstrated capable of detecting certain size flaws on the outside diameter of the weld, but it does not specify any demonstration requirements. To be acceptable, Section XI, Appendix VIII, type rules for performance demonstration need to be developed and applied.  
N-615     Ultrasonic Examination as a Surface Examination Method for Category         7/28/01 B-F and B-J Piping Welds, Section XI, Division 1 The Code Case requires that the ultrasonic technique used be demonstrated capable of detecting certain size flaws on the outside diameter of the weld, but it does not specify any demonstration requirements. To be acceptable, Section XI, Appendix VIII, type rules for performance demonstration need to be developed and applied.
DG-1193, Page 12


DG-1193, Page 13 Code Case Number Table 2 Unacceptable Section XI Code Cases Date or Supplement/ Edition Summary N-618 Use of a Reactor Pressure Vessel as a Transportation Containment System, Section XI, Division 1 6/17/03  The Code Case was developed as a potential option for shipping and disposal of a reactor pressure vessel (RPV). The NRC staff determined, however, that the Code Case was not applicable to the review and approval process for transportation packages. The use of RPVs as a transportation package has been addressed under 10 CFR Part 71, APackaging and Transportation of Radioactive Material
Code Case                                   Table 2                                   Date or Number                  Unacceptable Section XI Code Cases                       Supplement/
@ (Ref. 11).
Edition Summary N-618     Use of a Reactor Pressure Vessel as a Transportation Containment             6/17/03 System, Section XI, Division 1 The Code Case was developed as a potential option for shipping and disposal of a reactor pressure vessel (RPV). The NRC staff determined, however, that the Code Case was not applicable to the review and approval process for transportation packages. The use of RPVs as a transportation package has been addressed under 10 CFR Part 71, APackaging and Transportation of Radioactive Material@ (Ref. 11).
N-622 Ultrasonic Examination of RPV and Piping, Bolts, and Studs, Section XI, Division 1 Annulled on 1/12/05 The Code Case was published in May 1999. Industry Performance Demonstration Initiative efforts since that time have made this Code Case obsolete. Issues associated with supplements to Appendix VIII are being addressed individually in separate Code Cases.
N-622     Ultrasonic Examination of RPV and Piping, Bolts, and Studs,               Annulled on Section XI, Division 1                                                       1/12/05 The Code Case was published in May 1999. Industry Performance Demonstration Initiative efforts since that time have made this Code Case obsolete. Issues associated with supplements to Appendix VIII are being addressed individually in separate Code Cases.
N-653 Qualification Requirements for Full Structural Overlaid Wrought Austenitic Piping Welds, Section XI, Division 1 9/7/01  (1) Section XI, Appendix VIII, Supplement 11, requires a personnel performance qualification as part of the procedure qualification. The detection acceptance criteria in the Code Case do not require personnel performance qualification as part of the procedure qualification. Personnel qualification is necessary to validate the effectiveness of the procedure qualification.
N-653     Qualification Requirements for Full Structural Overlaid Wrought               9/7/01 Austenitic Piping Welds, Section XI, Division 1 (1) Section XI, Appendix VIII, Supplement 11, requires a personnel performance qualification as part of the procedure qualification. The detection acceptance criteria in the Code Case do not require personnel performance qualification as part of the procedure qualification. Personnel qualification is necessary to validate the effectiveness of the procedure qualification.
(2) The minimum grading unit is 1.0 inch in the circumferential direction. The acceptance tolerance, however, is 0.75 inch root mean square error. Thus, the length sizing acceptance criteria do not adequately prevent the use of testmanship rather than skill to pass length sizing tests.
(2) The minimum grading unit is 1.0 inch in the circumferential direction. The acceptance tolerance, however, is 0.75 inch root mean square error. Thus, the length sizing acceptance criteria do not adequately prevent the use of testmanship rather than skill to pass length sizing tests.
N-654 Acceptance Criteria for Flaws in Ferritic Steel Components 4 in. and Greater in Thickness, Section XI, Division 1 4/17/02  Licensees intending to apply the rules of this Code Case must obtain NRC approval of the specific application in accordance with 10 CFR  
N-654     Acceptance Criteria for Flaws in Ferritic Steel Components 4 in. and         4/17/02 Greater in Thickness, Section XI, Division 1 Licensees intending to apply the rules of this Code Case must obtain NRC approval of the specific application in accordance with 10 CFR 50.55a(a)(3).
DG-1193, Page 13


50.55a(a)(3).  
Code Case                                    Table 2                                    Date or Number                    Unacceptable Section XI Code Cases                        Supplement/
Edition Summary N-691      Application of Risk-Informed Insights to Increase the Inspection Interval      11/18/03 for Pressurized Water Reactor Vessels, Section XI, Division 1 A response to the NRC staff=s request for additional information has not yet been received and therefore, insufficient information has been provided for the staff to make a determination relative to the acceptability of this Code Case.
N-702      Alternative Requirements for Boiling Water Reactor (BWR) Nozzle Inner          2/20/04 Radius and Nozzle-to-Shell Welds, Section XI, Division 1 The Electric Power Research Institute (EPRI) proprietary report, BWR Vessel and Internals Project, Technical Basis for the Reduction of Inspection Requirements for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Inner Radius (BWRVIP-108), is the technical-basis document for Code Case N-702. EPRI is revising the report based on NRC staff review of the report and supplementary information provided by the BWRVIP (See letter dated December 19, 2007, ML073600374; Ref. 12). The NRC will reconsider the status of Code Case N-702 after receipt of the revised report.
N-711      Alternative Examination Coverage Requirements for Examination                    8/04E Category B-F, B-J, C-F-1, C-F-2, and R-A Piping Welds, Section XI, Division 1 The Code Case would permit each licensee to independently determine when achievement of a coverage requirement is impractical, and when Code-required coverage is satisfied. As a result, application of the Code Case for similar configurations at different plants could result in potentially significant quantitative variations. Furthermore, application of the Code Case is inconsistent with NRCs responsibility for determining whether examinations are impractical, and eliminates the NRCs ability to take exception to a licensees proposed action and impose additional measures where warranted in accordance with 10 CFR 50.55a(g)(6)(i).
DG-1193, Page 14


DG-1193, Page 14 Code Case Number Table 2 Unacceptable Section XI Code Cases Date or Supplement/ Edition Summary N-691 Application of Risk-Informed Insights to Increase the Inspection Interval for Pressurized Water Reactor Vessels, Section XI, Division 1 11/18/03  A response to the NRC staff
Code Case                                   Table 2                                   Date or Number                    Unacceptable Section XI Code Cases                       Supplement/
=s request for additional information has not yet been received and therefore, insufficient information has been provided for the staff to make a determination relative to the acceptability of this Code Case.
Edition Summary N-716      Alternative Piping Classification and Examination Requirements,               9/04E Section XI, Division 1 The NRC has approved risk-informed inservice inspection programs based, in part, on methods described in Code Case N-716. The NRC has approved programs for Grand Gulf Nuclear Station 1 (September 21, 2007; ML072430005) , Donald C. Cook Nuclear Plant (September 28, 2007; ML072620553), and Waterford Steam Electric Station (April 28, 2008; ML080980120). The approvals were specific to these units and relied on several changes to the methodology described in Code Case N-716. It is anticipated that changes will be made to the Code Case. The staff will consider the revised Code Case for generic approval when it is published by the ASME.
N-702 Alternative Requirements for Boiling Water Reactor (BWR) Nozzle Inner Radius and Nozzle-to-Shell Welds, Section XI, Division 1 2/20/04  The Electric Power Research Institute (EPRI) proprietary report, "BWR Vessel and Internals Project, Technical Basis for the Reduction of Inspection Requirements for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Inner Radius (BWRVIP-108)," is the technical-basis document for Code Case N-702. EPRI is revising the report based on NRC staff review of the report and supplementary information provided by the BWRVIP (See letter dated December 19, 2007, ML073600374; Ref. 12). The NRC will reconsider the status of Code Case N-702 after receipt of the revised report.
N-729      Alternative Examination Requirements for PWR Reactor Vessel Upper            7/04E Heads With Nozzles Having Pressure-Retaining Partial-Penetration Nozzles, Section XI, Division 1 Code Case N-729 has been superseded by Revision 1 to the Code Case.
N-711 Alternative Examination Coverage Requirements for Examination Category B-F, B-J, C-F-1, C-F-2, and R-A Piping Welds, Section XI, Division 1 8/04E  The Code Case would permit each licensee to independently determine when achievement of a coverage requirement is impractical, and when Code-required coverage is satisfied. As a result, application of the Code Case for similar configurations at different plants could result in potentially significant quantitative variations. Furthermore, application of the Code Case is inconsistent with NRC's responsibility for determining whether examinations are impractical, and eliminates the NRC's ability to take exception to a licensee's proposed action and impose additional measures where warranted in accordance with 10 CFR 50.55a(g)(6)(i).  
N-729-1 is conditionally approved directly in 10 CFR 50.55a and not through Regulatory Guide 1.147.
N-740      Dissimilar Metal Weld Overlay for Repair of Class 1, 2, and 3 Items,         11/04E Section XI, Division 1 Revision 2 to the Code Case is currently under development by Section XI. Revision 1 has been published, but the NRC staff has many issues with Revisions 0 and 1. The issues have been communicated to the cognizant Section XI committees, and the staff continues to work with the committees to resolve the issues. Due to the total number of issues and the nature of some (e.g., lack of certain fundamental design details), the staff believes that it would be inappropriate to attempt to conditionally approve either version 0 or 1 in Regulatory Guide 1.147. The staff will consider Revision 2 for approval when it is published by the ASME.
DG-1193, Page 15


DG-1193, Page 15 Code Case Number Table 2 Unacceptable Section XI Code Cases Date or Supplement/ Edition  Summary  N-716 Alternative Piping Classification and Examination Requirements,    Section XI, Division 1 9/04E The NRC has approved risk-informed inservice inspection programs based, in part, on methods described in Code Case N-716. The NRC has approved programs for Grand Gulf Nuclear Station 1 (September 21, 2007; ML072430005) , Donald C. Cook Nuclear Plant (September 28, 2007; ML072620553), and Waterford Steam Electric Station (April 28, 2008; ML080980120). The approvals were specific to these units and relied on several changes to the methodology described in Code Case N-716. It is anticipated that changes will be made to the Code Case. The staff will consider the revised Code Case for generic approval when it is published by the ASME. N-729 Alternative Examination Requirements for PWR Reactor Vessel Upper Heads With Nozzles Having Pressure-Retaining Partial-Penetration Nozzles, Section XI, Division 1 7/04E  Code Case N-729 has been superseded by Revision 1 to the Code Case. N-729-1 is conditionally approved directly in 10 CFR 50.55a and not through Regulatory Guide 1.
Code Case                                   Table 2                                     Date or Number                   Unacceptable Section XI Code Cases                         Supplement/
147. N-740 Dissimilar Metal Weld Overlay for Repair of Class 1, 2, and 3 Items, Section XI, Division 1 11/04E Revision 2 to the Code Case is currently under development by Section XI. Revision 1 has been published, but the NRC staff has many issues with Revisions 0 and 1. The issues have been communicated to the cognizant Section XI committees, and the staff continues to work with the committees to resolve the issues. Due to the total number of issues and the nature of some (e.g., lack of certain fundamental design details), the staff believes that it would be inappropriate to attempt to conditionally approve either version 0 or 1 in Regulatory Guide 1.147. The staff will consider Revision 2 for approval when it is published by the ASME.
Edition Summary N-747     Reactor Vessel Head-to-Flange Weld Examinations, Section XI,                   9/04E Division 1 Alternatives to current ISI requirements that use a probabilistic risk assessment (PRA) as a basis must initially be submitted as a risk-informed ISI program relief request in accordance with 10 CFR 50.55a(a)(3)(i), i.e.,
DG-1193, Page 16 Code Case Number Table 2 Unacceptable Section XI Code Cases Date or Supplement/ Edition Summary N-747 Reactor Vessel Head-to-Flange Weld Examinations, Section XI,   Division 1 9/04E Alternatives to current ISI requirements that use a probabilistic risk assessment (PRA) as a basis must initially be submitted as a risk-informed ISI program relief request in accordance with 10 CFR 50.55a(a)(3)(i), i.e., on a plant-specific basis and not on a generic basis.
on a plant-specific basis and not on a generic basis.
As a general comment, the NRC staff finds that the technical basis is too qualitative. Three specific issues are provided to highlight additional concerns. First, no supporting fluence assessment or documentation to establish a conservative neutron fluence estimate for these welds and a conservative RT ndt value for the welds is provided. Thus, there is no data to support a conclusion that the fracture toughness is low. Second, the methods in Appendix G to Section XI apply only to pressure-temperature limit methods and not to ISI inspection requirements. Third, the technical basis appears to credit K-1 C twice - once to support the fracture toughness analysis and again in the Section XI Appendix A flaw growth analysis.  
As a general comment, the NRC staff finds that the technical basis is too qualitative. Three specific issues are provided to highlight additional concerns. First, no supporting fluence assessment or documentation to establish a conservative neutron fluence estimate for these welds and a conservative RTndt value for the welds is provided. Thus, there is no data to support a conclusion that the fracture toughness is low. Second, the methods in Appendix G to Section XI apply only to pressure-temperature limit methods and not to ISI inspection requirements. Third, the technical basis appears to credit K-1C twice - once to support the fracture toughness analysis and again in the Section XI Appendix A flaw growth analysis.
DG-1193, Page 16
: 3.      Unacceptable OM Code Cases The following OM Code Cases were determined to be unacceptable for use by licensees in their inservice testing programs. The ASME issues OM Code Cases annually with publication of a new edition or addenda. No new OM Code Cases were added in this revision. To assist users of the OM Code, Column 3 of Table 3 lists the edition or addenda to which each Code Case was attached (E: edition; A: addenda), and whether the Code Case is new or reaffirmed.
Table 3. Unacceptable OM Code Cases Code Case                                          Table 3                                    Edition/
Number                              Unacceptable OM Code Cases                                Addenda Summary of Basis for Exclusion OMN-10, Rev. 0        Requirements for Safety Significance Categorization of Snubbers Using    July 1, 2000A Risk Insights and Testing Strategies for Inservice Testing of LWR Power Plants The method used for categorizing snubbers could result in certain snubbers being inappropriately categorized as having low safety significance. These snubbers would not be adequately tested or inspected to provide assurance of their operational readiness. In addition, unexpected extensive degradation in feedwater piping has occurred which would necessitate a more rigorous approach to snubber categorization than presently contained in this Code Case.
D. IMPLEMENTATION The purpose of this section is to provide information to applicants and licensees regarding the NRC staff=s plans for using this regulatory guide. This regulatory guide does not approve the use of the Code Cases listed herein. Licensees may submit a plant-specific request to implement one or more of the Code Cases listed in this regulatory guide. The request must address the NRC=s concerns about the Code Case at issue.
DG-1193, Page 17


DG-1193, Page 17 3. Unacceptable OM Code Cases The following OM Code Cases were determined to be unacceptable for use by licensees in their inservice testing programs. The ASME issues OM Code Cases annually with publication of a new edition or addenda. No new OM Code Cases were added in this revision. To assist users of the OM Code, Column 3 of Table 3 lists the edition or addenda to which each Code Case was attached (E: edition; A: addenda), and whether the Code Case is new or reaffirmed.
REFERENCES
Table 3. Unacceptable OM Code Cases Code Case Number  Table 3 Unacceptable OM Code Cases Edition/ Addenda  Summary of Basis for Exclusion OMN-10, Rev. 0 Requirements for Safety Significance Categorization of Snubbers Using Risk Insights and Testing Strategies for Inservice Testing of LWR Power Plants  July 1, 2000A
: 1. Code of Federal Regulations, Title 10, Energy, Part 50, ADomestic Licensing of Production and Utilization Facilities@ (10 CFR Part 50), U.S. Nuclear Regulatory Commission, Washington, DC.1
 
: 2. ASME Boiler and Pressure Vessel Code, Section III, ARules for Construction of Nuclear Power Plant Components,@ Division I; and Section XI, ARules for Inservice Inspection of Nuclear Power Plant Components,@ American Society of Mechanical Engineers, New York, NY.2
The method used for categorizing snubbers could result in certain snubbers being inappropriately categorized as having low safety significance. These snubbers would not be adequately tested or inspected to provide assurance of their operational readiness. In addition, unexpected extensive degradation in feedwater piping has occurred which would necessitate a more rigorous approach to snubber categorization than presently contained in this Code Case.
: 3. ASME Code for Operation and Maintenance of Nuclear Power Plants, American Society of Mechanical Engineers, New York, NY.2
D. IMPLEMENTATION The purpose of this section is to provide information to applicants and licensees regarding the NRC staff
: 4. Regulatory Guide 1.84, ADesign, Fabrication, and Materials Code Case Acceptability, ASME Section III,@ U.S. Nuclear Regulatory Commission, Washington, DC.3
=s plans for using this regulatory guide. This regulatory guide does not approve the use of the Code Cases listed herein. Licensees may submit a plant-specific request to implement one or more of the Code Cases listed in this regulatory guide. The request must address the NRC
: 5. Regulatory Guide 1.147, AInservice Inspection Code Case Acceptability, ASME Section XI, Division 1,@ U.S. Nuclear Regulatory Commission, Washington, DC.3
=s concerns about the Code Case at issue.
: 6. Paperwork Reduction Act of 1995 (Public Law 104-13), United States Code, Title 44, APublic Printing and Documents,@ Chapter 35, ACoordination of Federal Information Policy@ (44 U.S.C. 3501 et seq.),
 
104th Congress of the United States of America, Washington, DC.4
DG-1193, Page 18 REFERENCES
: 7. Miller, C.D., ASummary of Buckling Tests on Fabricated Steel Cylindrical Shells in USA,@ in Offshore Structures Engineering III: Buckling of Shells in Offshore Structures, J.E. Harding, P.J. Dowling, and N. Agelidis, eds., Gulf Publishing Company, Houston, TX, pp. 429B447, 1982.
: 1. Code of Federal Regulations, Title 10, Energy, Part 50, ADomestic Licensing of Production and Utilization Facilities
1 All NRC regulations listed herein are available electronically through the Public Electronic Reading Room on the NRC=s public Web site, at http://www.nrc.gov/reading-rm/doc-collections/cfr/. Copies are also available for inspection or copying for a fee from the NRC=s Public Document Room at 11555 Rockville Pike, Rockville, MD; the PDR=s mailing address is USNRC PDR, Washington, DC 20555; telephone (301) 415-4737 or (800) 397-4209; fax (301) 415-3548; email PDR@nrc.gov.
@ (10 CFR Part 50), U.S. Nuclear Regulatory Commission, Washington, DC.
2 Copies may be purchased from the American Society of Mechanical Engineers, Three Park Avenue, NewYork, NY 10016-5990; phone (212) 591-8500; fax (212) 591-8501; www.asme.org.
1
3 All regulatory guides listed herein are available electronically through the Electronic Reading Room on the NRC=s public Web site at http://www.nrc.gov/reading-rm/doc-collections/reg-guides/. Active guides may be purchased from the National Technical Information Service (NTIS). Details may be obtained by contacting NTIS at 5285 Port Royal Road, Springfield, Virginia 22161, online at http://www.ntis.gov, by telephone at (800) 553-NTIS (6847) or (703) 605-6000, or by fax to (703) 605-6900. Copies are also available for inspection or copying for a fee from the NRC=s Public Document Room (PDR), which is located at 11555 Rockville Pike, Rockville, Maryland; the PDR=s mailing address is USNRC PDR, Washington, DC 20555-0001. The PDR can also be reached by telephone at (301) 415-4737 or (800) 397-4209, by fax at (301) 415-3548, and by email to PDR@nrc.gov.
: 2. ASME Boiler and Pressure Vessel Code, Section III, ARules for Construction of Nuclear Power Plant Components,@ Division I; and Section XI, ARules for Inservice Inspection of Nuclear Power Plant Components,@ American Society of Mechanical Engineers, New York, NY.
4 The Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.) is available electronically through the Federal Register Web site administered by the U.S. National Archives and Records Administration, at http://www.archives.gov/ federa-register/laws/paperwork-reduction/
2
DG-1193, Page 18
: 3. ASME Code for Operation and Maintenance of Nuclear Power Plants, American Society of Mechanical Engineers, New York, NY.
: 8. NRC Spent Fuel Project Office Interim Staff Guidance No. 4 (ISG-4), Rev. 1, ACask Closure Weld Inspections,@ U.S. Nuclear Regulatory Commission, Washington, DC.5
2
: 9. Code of Federal Regulations, Title 10, Energy, Part 72, ALicensing Requirements for the Independent Storage of Spent Nuclear Fuel, High-Level Radioactive Waste, and Reactor-Related Greater than Class C Waste@ (10 CFR Part 72), U.S. Nuclear Regulatory Commission, Washington, DC.
: 4. Regulatory Guide 1.84, ADesign, Fabrication, and Materials Code Case Acceptability, ASME Section III,@ U.S. Nuclear Regulatory Commission, Washington, DC.
: 10. ARecommendations for an Effective Flow-Accelerated Corrosion Program@ (NSAC-202L-R3),
3
Electric Power Research Institute, Palo Alto, CA.6
: 5. Regulatory Guide 1.147, AInservice Inspection Code Case Acceptability, ASME Section XI, Division 1,@ U.S. Nuclear Regulatory Commission, Washington, DC.
: 11. Code of Federal Regulations, Title 10, Energy, Part 71, APackaging and Transportation of Radioactive Material@ (10 CFR Part 71), U.S. Nuclear Regulatory Commission, Washington, DC.
3
: 6. Paperwork Reduction Act of 1995 (Public Law 104-13), United States Code, Title 44, APublic Printing and Documents,@ Chapter 35, ACoordination of Federal Information Policy
@ (44 U.S.C. 3501 et seq.), 104 th Congress of the United States of America, Washington, DC.
4
: 7. Miller, C.D., ASummary of Buckling Tests on Fabricated Steel Cylindrical Shells in USA,@ in Offshore Structures Engineering III: Buckling of Shells in Offshore Structures, J.E. Harding, P.J. Dowling, and N. Agelidis, eds., Gulf Publishing Company, Houston, TX, pp. 429 B 447, 1982.  
 
1 All NRC regulations listed herein are available electronically through the Public Electronic Reading Room on the NRC
=s public Web site, at http://www.nrc.gov/r eading-rm/doc-collections/cfr/. Copies are also available for inspection or copying for a fee from the NRC
=s Public Document Room at 11555 Rockville Pike, Rockville, MD; the PDR
=s mailing address is USNRC PDR, Washington, DC 20555; telephone (301) 415-4737 or (800) 397-4209; fax (301) 415-3548; email PDR@nrc.gov. 2 Copies may be purchased from the American Society of Mechanical Engineers, Three Park Avenue, NewYork, NY 10016-5990; phone (212) 591-8500; fax (212) 591-8501; www.asme.org. 3 All regulatory guides listed herein are available electronically through the Electronic Reading Room on the NRC=s public Web site at http://www.nrc.gov/r eading-rm/doc-collections/reg-guides/. Active guides may be purchased from the National Technical Information Service (NTIS). Details may be obtained by contacting NTIS at 5285 Port Royal Road, Springfield, Virginia 22161, online at http://www.ntis.gov, by telephone at (800) 553-NTIS (6847) or (703) 605-6000, or by fax to (703) 605-6900. Copies are also available for inspection or copying for a fee from the NRC
=s Public Document Room (PDR), which is located at 11555 Rockville Pike, Rockville, Maryland; the PDR
=s mailing address is USNRC PDR, Washington, DC 20555-0001. The PDR can also be reached by telephone at (301) 415-4737 or (800) 397-4209, by fax at (301) 415-3548, and by email to PDR@nrc.gov. 4 The Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.) is available electronically through the Federal Register Web site administered by the U.S. National Archives and Records Administration, at http://www.archives.gov/ federa-register/laws/paperwork-reduction/
 
DG-1193, Page 19
: 8. NRC Spent Fuel Project Office Interim Staff Guidance No. 4 (ISG-4), Rev. 1, ACask Closure Weld Inspections,@ U.S. Nuclear Regulatory Commission, Washington, DC.
5
: 9. Code of Federal Regulations, Title 10, Energy, Part 72, ALicensing Requirements for the Independent Storage of Spent Nuclear Fuel, High-Level Radioactive Waste, and Reactor-Related Greater than Class C Waste
@ (10 CFR Part 72), U.S. Nuclear Regulatory Commission, Washington, DC.
: 10. ARecommendations for an Effective Flow-Accelerated Corrosion Program
@ (NSAC-202L-R3), Electric Power Research Institute, Palo Alto, CA.
6
: 11. Code of Federal Regulations, Title 10, Energy, Part 71, APackaging and Transportation of Radioactive Material
@ (10 CFR Part 71), U.S. Nuclear Regulatory Commission, Washington, DC.
: 12. Mitchell, M.. letter to Libra, R., December 19, 2007, Safety Evaluation of Proprietary EPRI Report, "BWR Vessel and Internals Project, Technical Basis for the Reduction of Inspection Requirements for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Inner Radius (BWRVIP-108)," ADAMS Accession Number ML073600374.
: 12. Mitchell, M.. letter to Libra, R., December 19, 2007, Safety Evaluation of Proprietary EPRI Report, "BWR Vessel and Internals Project, Technical Basis for the Reduction of Inspection Requirements for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Inner Radius (BWRVIP-108)," ADAMS Accession Number ML073600374.
: 13. NRC Spent Fuel Storage and Transportation Division Interim Staff Guidance No. 18 (ISG-18) Rev. 1, "The Design and Testing of Lid Welds on Austenitic Stainless Steel Canisters as Containment Boundary for Spent Fuel Storage," U.S. Nuclear Regulatory Commission, Washington, D.C.  
: 13. NRC Spent Fuel Storage and Transportation Division Interim Staff Guidance No. 18 (ISG-18)
 
Rev. 1, The Design and Testing of Lid Welds on Austenitic Stainless Steel Canisters as Containment Boundary for Spent Fuel Storage, U.S. Nuclear Regulatory Commission, Washington, D.C.
5 This interim staff guidance is available electronically through the NRC
5 This interim staff guidance is available electronically through the NRC=s Agencywide Documents Access and Management System (ADAMS), http://www.nrc.gov/reading-rm/adams.html, under Accession Number ML051520313.
=s Agencywide Documents Access and Management System (ADAMS), http://www.nrc.gov/r eading-rm/adams.html, under Accession Number ML051520313.
6 Copies may be purchased from the Electric Power Research Institute (EPRI), 3420 Hillview Ave., Palo Alto, California 94304; telephone (800) 313-3774; fax (925) 609-1310.
6 Copies may be purchased from the Electric Power Research Institute (EPRI), 3420 Hillview Ave., Palo Alto, California 94304; telephone (800) 313-3774; fax (925) 609-1310.}}
DG-1193, Page 19}}

Latest revision as of 08:35, 7 December 2019

Draft Regulatory Guide DG-1193, ASME Code Cases Not Approved for Use.
ML080920854
Person / Time
Issue date: 04/30/2009
From:
Office of Nuclear Regulatory Research
To:
Norris W E, RES/DE, 301415-6796
Shared Package
ML080670547 List:
References
DG-1193 RG-1.193, Rev 3
Download: ML080920854 (19)
v • d • e


Text

U.S. NUCLEAR REGULATORY COMMISSION April 2009 OFFICE OF NUCLEAR REGULATORY RESEARCH Division 1 DRAFT REGULATORY GUIDE

Contact:

W.E. Norris (301) 251-7650 DRAFT REGULATORY GUIDE DG-1193 (Proposed Revision 3 of Regulatory Guide 1.193, dated October 2007)

ASME CODE CASES NOT APPROVED FOR USE A. INTRODUCTION In Title 10, Part 50, of the Code of Federal Regulations (10 CFR Part 50), ADomestic Licensing of Production and Utilization Facilities@ (Ref. 1), Section 50.55a(c), AReactor Coolant Pressure Boundary,@

requires, in part, that components of the reactor coolant pressure boundary be designed, fabricated, erected, and tested in accordance with the requirements for Class 1 components of Section III, ARules for Construction of Nuclear Power Plant Components,@ of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (BPV) Code (Ref. 2) or equivalent quality standards. Section 50.55a(f), AInservice Testing Requirements,@ requires, in part, that Class 1, 2, and 3 components and their supports meet the requirements of the ASME Code for Operation and Maintenance of Nuclear Power Plants (OM Code) (Ref. 3) or equivalent quality standards. Finally, 10 CFR 50.55a(g),

AInservice Inspection Requirements,@ requires, in part, that Class 1, 2, 3, MC (metal containment), and CC (concrete containment) components and their supports meet the requirements of Section XI, ARules for Inservice Inspection of Nuclear Power Plant Components,@ of the ASME BPV Code or equivalent quality standards.

The ASME publishes a new edition of the BPV and OM Codes every 3 years and new addenda every year. The latest editions and addenda of Section III,Section XI, and the OM Code that the U.S.

Nuclear Regulatory Commission (NRC) has approved for use by licensees are referenced in 10 CFR This regulatory guide is being issued in draft form to involve the public in the early stages of the development of a regulatory position in this area. It has not received staff review or approval and does not represent an official NRC staff position.

Public comments are being solicited on this draft guide (including any implementation schedule) and its associated regulatory analysis or value/impact statement. Comments should be accompanied by appropriate supporting data. Written comments may be submitted to the Rulemaking, Directives, and Editing Branch, Office of Administration, U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001; e-mailed to nrcrep.resource@nrc.gov; submitted through the Federal e-rulemaking portal: http://www.regulations.gov or faxed to (301) 415-5144. Copies of comments received may be examined on http://regulation.gov or at the NRCs Public Document Room, 11555 Rockville Pike, Rockville, MD. Comments will be most helpful if received by xxxxxxxxxxxxx.

Electronic copies of this draft regulatory guide are available on http://www.regulations.gov, the NRCs public Web site under Draft Regulatory Guides in the Regulatory Guides document collection of the NRCs Electronic Reading Room at http://www.nrc.gov/reading-rm/doc-collections/; and the NRCs Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html, under ML080920854.

50.55a(b). The ASME also publishes Code Cases for Section III and Section XI quarterly and Code Cases for the OM Code yearly. Code Cases provide alternatives developed and approved by the ASME.

The NRC staff has reviewed Section III and Section XI Code Cases listed in Supplements 2B11 to the 2004 Edition, and Supplement 0 to the 2007 Edition of the ASME BPV Code. It should be noted that Supplement 0 to the 2007 Edition also serves as Supplement 12 to the 2004 Edition. Draft Revision 35 of Regulatory Guide 1.84, ADesign, Fabrication, and Materials Code Case Acceptability, ASME Section III@ (Ref. 4), and Draft Revision 16 of Regulatory Guide 1.147, AInservice Inspection Code Case Acceptability, ASME Section XI, Division 1@ (Ref. 5), have been published concurrently with this guide to identify the Code Cases that the NRC has determined to be acceptable alternatives to applicable parts of Section III and Section XI. This regulatory guide does not approve the use of the Code Cases listed herein.

Because this regulatory guide does not approve the use of the Code Cases listed herein, it does not contain new or amended information collection requirements subject to the Paperwork Reduction Act of 1995 (Ref. 6). The NRC may neither conduct nor sponsor, and a person is not required to respond to, an information collection request or requirement unless the requesting document displays a currently valid control number issued by the Office of Management and Budget (OMB).

B. DISCUSSION This regulatory guide lists the Code Cases that the NRC has determined not to be acceptable for use on a generic basis. A brief description of the basis for the determination is provided with each Code Case. Licensees may submit a request to implement one or more of the Code Cases listed below through 10 CFR 50.55a(a)(3), which permits the use of alternatives to the Code requirements referenced in 10 CFR 50.55a, provided that the proposed alternatives result in an acceptable level of quality and safety. Licensees must submit a plant-specific request that addresses the NRC=s concerns about the Code Case at issue.

C. REGULATORY POSITION For this guide, the NRC reviewed the Section III and Section XI Code Cases listed in Supplements 2B11 to the 2004 Edition, and Supplement 0 to the 2007 Edition of the ASME BPV Code. Licensees may not implement Code Cases listed in this guide without prior NRC approval.

1. Unacceptable Section III Code Cases The NRC determined that the following Section III Code Cases are unacceptable for use by licensees in their Section III design and construction programs.

DG-1193, Page 2

Table 1. Unacceptable Section III Code Cases Code Case Table 1 Date or Number Unacceptable Section III Code Cases Supplement/

Edition Summary N-284-1 Metal Containment Shell Buckling Design Methods,Section III, Division 5/9/03 1, Class MC (1) The following errata, misprints, recommendations, and errors have been identified:

Fig. 1511.1, The curve for L should not exceed 0.8 for any value of (R/t).

-1512, The statement ASee Fig. 1512-1 then see -1713.1.2 for method of calculating M@ should be rephrased as: ASee

-1713.1.2 for method of calculating M, then see Fig. -1512-1.@

-1513, Recommend AUse the value of il given for spherical shells in accordance with -1512.@

-1521, (i) In (a) Axial Compression, AG = L@ should be changed to AG = L.@ (ii) The source of the equations shown under A(a) Axial Compression@ provided separate instability equations for stringer-stiffened and ring-stiffened cylindrical shells. The Code Case adopted the instability equations pertaining to ring-stiffened shells, which are less conservative than those for stringer instability, for both ring and/or stringer stiffened cylindrical shells. Is this the intent? (Ref. 7).

-1712.1.1, The equation ACh = 0.92/(M - 0.636)@ should be changed to ACh = 0.92/(M - 0.636).@

-1712.1.1-1, The leftmost curve should be labeled Ch.

-1712.2.2, (a) Axial Compression, (i) In the formula for ej, the denominator should be (m/Lj)2 C t. (ii) The expressions for C and C should be separated.

-1712.2.3, (i) The factor 1.944 in an older edition has been changed to 2.00. No basis is apparent. (ii) The misprint At 13@

should be corrected to At13.@

-1713.1.1, (i) The equation Aa=Cel/FS@ should be changed to Aa=LCel/FS.@ (ii) The title of (c) should be changed to AAxial Compression Plus In-Plane Shear.@

-1713.1-1, In (b), the lower value AKs=ra@ on the vertical axis should be changed to AKs=ha.@

-1713.2.1, (i) The headings for (b) and (c) should include the words AIn-Plane.@ (ii) In (b) AAxial Compression Plus Shear,@

A@ should be changed to A.@

DG-1193, Page 3

Code Case Table 1 Date or Number Unacceptable Section III Code Cases Supplement/

Edition Summary N-284-1 Metal Containment Shell Buckling Design Methods,Section III, Division 5/9/03 (contd) 1, Class MC (2) Applicants intending to use Code Case N-284-1 shall submit a request to the NRC staff for its review and approval on a plant-specific basis.

(3) The rules applicable to evaluate the buckling and instability of containment shells for Section III, Division 3, are under development. Currently, use of Code Case N-284-1 by licensees for storage canisters and transportation casks is permissible provided it has been reviewed and approved by the NRC N-483-2 Alternative Rules to the Provisions of NCA-3800, Requirements for 5/7/99 N-483-3 Purchase of Material,Section III, Divisions 1 and 3 2/25/02 The Code Case lacks sufficient detail to ensure that the supplied material is as represented by the Certified Material Test Report.

N-510 Borated Stainless Steel for Class CS Core Support Structures and Class 1 12/9/93 N-510-1 Component Supports,Section III, Division 1 8/14/01 No technical basis was provided for expanding the Code Case to include borated stainless steel Types 304B, 304B1, 304B2, and 304B3. A considerable amount of information was required to support the types presently contained in the Code Case. The revised Code Case would permit borated stainless steel to be used for component supports within the reactor vessel. The technical basis to support the Code Case only addresses the use of these materials as component supports in spent fuel racks and transportation casks.

N-519 Use of 6061-T6 and 6061-T651 Aluminum for Class 1 Nuclear Annulled 2/3/03 Components Code Case is applicable to only one DOE aluminum vessel.

N-530 Provisions for Establishing Allowable Axial Compressive Membrane 2/3/03 Stresses in the Cylindrical Walls of 0-15 Psi Storage Tanks, Classes 2 and 3

There are numerous errors in the equations. The errors must be corrected before the Code Case can be approved for use.

DG-1193, Page 4

Code Case Table 1 Date or Number Unacceptable Section III Code Cases Supplement/

Edition Summary N-565 Alternative Methods of Nozzle Attachment for Class 1 Vessels 12/3/99 The Code Case essentially requires a design using a seal to protect the threads from the contained fluid, and seals are not a Code item. The seal, which plays a very important part in the integrity of the joint, imposes too great a vulnerability in the design. The supporting information for the Code Case does not demonstrate the resulting threaded nozzle configuration is equivalent in integrity to that of a welded connection.

N-595 Requirements for Spent Fuel Storage Canisters,Section III, Division 1 2/26/99 N-595-1 9/24/99 N-595-2 12/8/00 N-595-3 04/08/02 N-595-4 2/04E Regulatory approval for the use of multi-purpose casks is presently addressed by the NRC Spent Fuel Project Office Interim Staff Guidance No. 4 (ISG-4), Rev. 1 (Ref. 8), and Interim Staff Guidance No. 18 (ISG-18), Rev. 1 (Ref. 13). The interim staff guidance provides a framework to ensure that the cask system, as designed, and when fabricated and used in accordance with the conditions specified in its Certificate of Compliance, meets the requirements of 10 CFR Part 72, ALicensing Requirements for the Independent Storage of Spent Nuclear Fuel, High-Level Radioactive Waste, and Reactor-Related Greater than Class C Waste@ (Ref. 9). It should be noted that Code Case N-717 replaces Code Case N-595-X.

N-645 Use of Rupture Disk Devices on Nuclear Fuel Storage Canisters, Class 1, 6/14/00 N-645-1 Section III, Division 1 2/3/03 The NRC does not permit the use of rupture disk devices in spent nuclear fuel storage canister designs.

DG-1193, Page 5

Code Case Table 1 Date or Number Unacceptable Section III Code Cases Supplement/

Edition Summary N-659 Use of Ultrasonic Examination in Lieu of Radiography for Weld 9/17/02 N-659-1 Examination,Section III, Division 1 11/18/03 The NRC is not going to endorse Code Case N-659 or Code Case N-659-1 at this time given the number of issues raised by NRC staff and the concerns expressed in the public comments. The NRC has determined that a more effective approach for developing a suitable performance demonstration program would be to work with ASME International to resolve the issues.

Code Case N-659 was conditionally approved in Draft Regulatory Guide DG-1133 (proposed Revision 34 of Regulatory Guide 1.84), which was published for public comment on October 27, 2006 (71 FR 62947).

Additional draft conditions were discussed in the statement of considerations for the proposed rule. Code Case N-659-1 was listed as unapproved in Draft Regulatory Guide DG-1135 (proposed Revision 2 to Regulatory Guide 1.193, AASME Code Cases Not Approved for Use@),

which was N-670 Use of Ductile Cast Iron Conforming to ASTM A 874/ A 874M-98 or JIS 6/04E G5504-1992 for Transport Containments,Section III, Division 3 The NRC has not yet endorsed Section III, Division 3, Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste. Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.

N-673 Boron Containing Power Metallurgy Aluminum Alloy for Storage and 8/7/03 Transportation of Spent Nuclear Fuel,Section III, Division 1 The Code Case does not address the following:

(1) Corrosion properties of this material in spent fuel pool chemistry and/or clean water.

(2) Impact properties for use as a structural material.

(3) Uniform distribution of boron carbide in the aluminum matrix.

(4) Mechanical properties for the use of the material in high-temperature conditions.

DG-1193, Page 6

Code Case Table 1 Date or Number Unacceptable Section III Code Cases Supplement/

Edition Summary N-693 Alternative Method to the Requirements of NB-3228.6 for Analyzing 5/21/03 Piping Subjected to Reversing Dynamic Load,Section III, Division 1 The Code Case would permit the use of the design, service, and test limits in Paragraph NB-3656(b) for Level D Service Limits. The limits in Paragraph NB-3656(b) are prohibited per 10 CFR 50.55a(b)(1)(iii).

N-707 Use of SA-537, Class 1 Plate Material for Spent-Fuel Containment 3/04E Internals in Non-pressure Retaining Applications Above 700°F (370°C),

Section III, Division 3 The NRC has not yet endorsed Section III, Division 3, Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste. Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.

N-717 Requirements for Construction of Storage Containments for Spent 5/04/4 Nuclear Fuel and High Level Radioactive Waste and Material,Section III, Division 3 The NRC has not yet endorsed Section III, Division 3, Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste. Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.

The provisions of the Code Case are copied from the July 1, 2005, addenda to Section III, Division 3. The changes to the ASME Code contained in the addenda are scheduled to be reviewed by the NRC staff in FY 2009. The Code Case is listed in this guide pending the results of the NRC staff review.

N-728 Use of ASTM B 932-04 Plate Material for Nonpressure Retaining Spent 7/04E Fuel Containment Internals to 650°F (343°C),Section III, Division 3 The NRC has not yet endorsed Section III, Division 3, Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste. Thus, it would not be appropriate to approve a Code Case that is an alternative to the Section III, Division 3, provisions.

DG-1193, Page 7

2. Unacceptable Section XI Code Cases The NRC determined that the following Section XI Code Cases are unacceptable for use by licensees in their Section XI inservice inspection programs.

Table 2. Unacceptable Section XI Code Cases Code Case Table 2 Date or Number Unacceptable Section XI Code Cases Supplement/

Edition Summary N-465 Alternative Rules for Pump Testing,Section XI, Division 1 11/30/88 N-465-1 Annulled 2/14/03 The draft standard referenced in the Code Case is outdated.

The requirements contained in the OM Code, ACode for Operation and Maintenance of Nuclear Power Plants,@ should be used. Note that Revision 12 of Regulatory Guide 1.147 (Ref. 5) approved N-465 for use.

The disapproval of N-465 for use applies only to new users.

N-473 Alternative Rules for Valve Testing,Section XI, Division 1 3/8/89 N-473-1 Annulled 2/14/03 The draft standard referenced in the Code Case is outdated.

The requirements contained in the OM Code, ACode for Operation and Maintenance of Nuclear Power Plants,@ should be used. Note that Revision 12 of Regulatory Guide 1.147 (Ref. 5) approved N-473 for use.

The disapproval of N-473 for use applies only to new users.

N-480 Examination Requirements for Pipe Wall Thinning Due to Single Phase Annulled Erosion and Corrosion,Section XI, Division 1 9/18/01 Code Case has been superseded by Code Case N-597, ARequirements for Analytical Evaluation of Pipe Wall Thinning,@ implemented in conjunction with NSAC-202L, ARecommendations for an Effective Flow-Accelerated Corrosion Program@ (Ref. 10).

N-498-2 Alternative Requirements for 10-Year System Hydrostatic Testing 6/9/95 N-498-3 for Class 1, 2, and 3 Systems,Section XI, Division 1 5/20/98 Code Case N-498-4 is conditionally approved in Revision 13 of Regulatory Guide 1.147 (Ref. 5). Those licensees choosing to implement this Code Case are to implement Revision 4, which is listed in Revision 15 of Regulatory Guide 1.147.

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Code Case Table 2 Date or Number Unacceptable Section XI Code Cases Supplement/

Edition Summary N-532-2 Alternative Requirements to Repair and Replacement Documentation 7/23/02 Requirements and Inservice Summary Report Preparation and Submission as Requested by IWA-4000 and IWA-6000,Section XI, Division 1 The following concerns were identified during review of the Code Case:

(1) The Code Case references new paragraph IWA-6350, which has not yet been incorporated into the ASME Code.

(2) NRC staff had difficulty reconciling Footnote 1 and Table 4 regarding the applicable edition and addenda.

(3) Submission of Form OAR-1 is at the end of each inspection period, rather than 90 days following the outage.

N-542 Alternative Requirements for Nozzle Inside Radius Section Length Sizing Annulled Performance Demonstration,Section XI, Division 1 3/28/01 Code Case N-542 was subsumed by Code Case N-552, AAlternative MethodsBQualification for Nozzle Inside Radius Section from the Outside Surface,@ which is being implemented by licensees.

Thus, there is no need to approve Code Case N-542.

N-547 Alternative Examination Requirements for Pressure Retaining Bolting of Annulled Control Rod Drive (CRD) Housings,Section XI, Division 1 5/20/01 Code Case NB547 states that the examination of CRD housing bolts, studs, and nuts is not required. However, 10 CFR 50.55a(b)(2)(xxi)(B) requires the examination of CRD bolting material whenever the CRD housing is disassembled and the bolting material is to be reused.

Examination of CRD bolting material is required to verify that service-related degradation has not occurred, or that damage such as bending and galling of threads has not occurred when performing maintenance activities that require the removal and reinstallation of bolting.

N-560 Alternative Examination Requirements for Class 1, Category B-J Piping 8/9/96 N-560-1 Welds,Section XI, Division 1 2/26/99 N-560-2 2/14/03 (1) The Code Case does not address inspection strategy for existing augmented and other inspection programs such as intergranular stress corrosion cracking (IGSCC), flow-assisted corrosion (FAC),

microbiological corrosion (MIC), and pitting.

(2) The Code Case does not provide system-level guidelines for change in risk evaluation to ensure that the risk from individual system failures will be kept small and dominant risk contributors will not be created.

DG-1193, Page 9

Code Case Table 2 Date or Number Unacceptable Section XI Code Cases Supplement/

Edition Summary N-561 Alternative Requirements for Wall Thickness Restoration of Class 2 and 12/31/96 N-561-1 High Energy Class 3 Carbon Steel Piping,Section XI, Division 1 3/28/01 Neither the ASME Code nor the Code Case have criteria for determining the rate or extent of degradation of the repair or the surrounding base metal. Reinspection requirements are not provided to verify structural integrity since the root cause may not be mitigated.

N-562 Alternative Requirements for Wall Thickness Restoration of Class 3 12/31/96 N-562-1 Moderate Energy Carbon Steel Piping,Section XI, Division 1 3/28/01 Neither the ASME Code nor the Code Case have criteria for determining the rate or extent of degradation of the repair or the surrounding base metal. Reinspection requirements are not provided to verify structural integrity since the root cause may not be mitigated.

N-574 NDE Personnel Recertification Frequency,Section XI, Division 1 Annulled 7/14/06 Based on data obtained by the NRC staff during its review of Appendix VIII, APerformance Demonstration for Ultrasonic Examination Systems,@ to Section XI, the NRC staff noted that proficiency decreases over time. The data do not support recertification examinations at a frequency of every 5 years.

N-575 Alternative Examination Requirements for Full Penetration 2/14/03 Nozzle-to-Vessel Welds in Reactor Vessels with Set-On Type Nozzles,Section XI, Division 1 The supporting basis for the Code Case applies to the specific configuration of one plant and is not applicable on a generic basis.

In addition, there are insufficient controls on stress and operating conditions to permit a generic reduction in examination volume. Finally, the boundaries of the volume of the weld, cladding, and heat affected zone from Figure 2 are ambiguous.

N-577 Risk-Informed Requirements for Class 1, 2, and 3 Piping, Method A, 9/2/97 N-577-1 Section XI, Division 1 2/14/03 (1) The Code Case does not address inspection strategy for existing augmented and other inspection programs such as IGSCC, FAC, MIC, and pitting.

(2) The Code Case does not provide system-level guidelines for change in risk evaluation to ensure that the risk from individual system failures will be kept small and dominant risk contributors will not be created.

DG-1193, Page 10

Code Case Table 2 Date or Number Unacceptable Section XI Code Cases Supplement/

Edition Summary N-578 Risk-Informed Requirements for Class 1, 2, and 3 Piping, Method B, 9/2/97 N-578-1 Section XI, Division 1 2/14/03 (1) The Code Case does not address inspection strategy for existing augmented and other inspection programs such as IGSCC, FAC, MIC, and pitting.

(2) The Code Case does not provide system-level guidelines for change in risk evaluation to ensure that the risk from individual system failures will be kept small and dominant risk contributors will not be created.

N-587 Alternative NDE Requirements for Repair/Replacement Activities, Annulled Section XI, Division 1 2/14/03 The NRC believes this Code Case is in conflict with the review process for approval of alternatives under 10 CFR 50.55a(a)(3). The Code Case would permit a licensee and the Authorized Nuclear Inspector to choose unspecified alternatives to regulatory requirements.

N-589 Class 3 Nonmetallic Cured-in-Place Piping,Section XI, 4/19/02 N-589-1 Division 1 7/23/02 (1) The installation process provides insufficient controls on wall thickness measurement.

(2) There are no qualification requirements for installers and installation procedures such as those for welders and welding procedures.

(3) Fracture toughness properties of the fiberglass are such that the cured-in-place piping (CIPP) could crack during a seismic event.

(4) Equations 4 and 5 in the Code Case contain an Ai@ term [a stress intensification factor] that is derived from fatigue considerations.

Stress intensification factors, however, have not been developed for fiberglass materials.

N-590 Alternative to the Requirements of Subsection IWE, Requirements Annulled 4/8/02 for Class MC and Metallic Liners of Class CC Components of Light-Water Cooled Plants,Section XI, Division 1 The provisions of the Code Case were incorporated into the 1998 Edition, which has been approved by the NRC. Thus, the Code Case is no longer needed and was annulled by the ASME.

DG-1193, Page 11

Code Case Table 2 Date or Number Unacceptable Section XI Code Cases Supplement/

Edition Summary N-591 Alternative to the Requirements of Subsection IWL, Requirements for Annulled 4/8/02 Class CC Concrete Components of Light-Water Cooled Plants,Section XI, Division 1 The provisions of the Code Case were incorporated into the 1998 Edition which has been approved by the NRC. Thus, the Code Case is no longer needed and was annulled by the ASME.

N-593-1 Examination Requirements for Steam Generator Nozzle-to-Vessel Welds, 3/04E Section XI, Division 1 The Code Case eliminates the requirement to examine the steam generator nozzle inner radius. Specifically, the examination volume for the nozzle inner radius was removed from Section XI, Figures IWB-2500-7(a) through IWB-2500-7(d). The action is applicable from the 1974 Edition through the 2004 Edition with 2005 Addenda. A similar action was taken regarding Code Case N-619. The NRC did not take exception to Code Case N-619 because 10 CFR 50.55a(b)(2)(xxi)(A) requires licensees to perform the examination in accordance with the 1998 Edition, which includes figures containing the examination volume. However, Code Case N-593-1 applies to editions prior to the 1998 Edition which do not have the appropriate figures.

N-613 Ultrasonic Examination of Full Penetration Nozzles in Vessels, 7/30/98 Examination Category B-D, Item No=s. B3.10 and B3.90, Reactor Vessel-To-Nozzle Welds, Fig. IWB-2500-7(a), (b), and (c),Section XI, Division 1 The Code Case conflicts with and unacceptably reduces the requirements of 10 CFR 50.55a(b)(2)(xv)(K)(2)(i). A revision to the Code Case has been developed to address the concerns.

N-615 Ultrasonic Examination as a Surface Examination Method for Category 7/28/01 B-F and B-J Piping Welds,Section XI, Division 1 The Code Case requires that the ultrasonic technique used be demonstrated capable of detecting certain size flaws on the outside diameter of the weld, but it does not specify any demonstration requirements. To be acceptable,Section XI, Appendix VIII, type rules for performance demonstration need to be developed and applied.

DG-1193, Page 12

Code Case Table 2 Date or Number Unacceptable Section XI Code Cases Supplement/

Edition Summary N-618 Use of a Reactor Pressure Vessel as a Transportation Containment 6/17/03 System,Section XI, Division 1 The Code Case was developed as a potential option for shipping and disposal of a reactor pressure vessel (RPV). The NRC staff determined, however, that the Code Case was not applicable to the review and approval process for transportation packages. The use of RPVs as a transportation package has been addressed under 10 CFR Part 71, APackaging and Transportation of Radioactive Material@ (Ref. 11).

N-622 Ultrasonic Examination of RPV and Piping, Bolts, and Studs, Annulled on Section XI, Division 1 1/12/05 The Code Case was published in May 1999. Industry Performance Demonstration Initiative efforts since that time have made this Code Case obsolete. Issues associated with supplements to Appendix VIII are being addressed individually in separate Code Cases.

N-653 Qualification Requirements for Full Structural Overlaid Wrought 9/7/01 Austenitic Piping Welds,Section XI, Division 1 (1)Section XI, Appendix VIII, Supplement 11, requires a personnel performance qualification as part of the procedure qualification. The detection acceptance criteria in the Code Case do not require personnel performance qualification as part of the procedure qualification. Personnel qualification is necessary to validate the effectiveness of the procedure qualification.

(2) The minimum grading unit is 1.0 inch in the circumferential direction. The acceptance tolerance, however, is 0.75 inch root mean square error. Thus, the length sizing acceptance criteria do not adequately prevent the use of testmanship rather than skill to pass length sizing tests.

N-654 Acceptance Criteria for Flaws in Ferritic Steel Components 4 in. and 4/17/02 Greater in Thickness,Section XI, Division 1 Licensees intending to apply the rules of this Code Case must obtain NRC approval of the specific application in accordance with 10 CFR 50.55a(a)(3).

DG-1193, Page 13

Code Case Table 2 Date or Number Unacceptable Section XI Code Cases Supplement/

Edition Summary N-691 Application of Risk-Informed Insights to Increase the Inspection Interval 11/18/03 for Pressurized Water Reactor Vessels,Section XI, Division 1 A response to the NRC staff=s request for additional information has not yet been received and therefore, insufficient information has been provided for the staff to make a determination relative to the acceptability of this Code Case.

N-702 Alternative Requirements for Boiling Water Reactor (BWR) Nozzle Inner 2/20/04 Radius and Nozzle-to-Shell Welds,Section XI, Division 1 The Electric Power Research Institute (EPRI) proprietary report, BWR Vessel and Internals Project, Technical Basis for the Reduction of Inspection Requirements for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Inner Radius (BWRVIP-108), is the technical-basis document for Code Case N-702. EPRI is revising the report based on NRC staff review of the report and supplementary information provided by the BWRVIP (See letter dated December 19, 2007, ML073600374; Ref. 12). The NRC will reconsider the status of Code Case N-702 after receipt of the revised report.

N-711 Alternative Examination Coverage Requirements for Examination 8/04E Category B-F, B-J, C-F-1, C-F-2, and R-A Piping Welds,Section XI, Division 1 The Code Case would permit each licensee to independently determine when achievement of a coverage requirement is impractical, and when Code-required coverage is satisfied. As a result, application of the Code Case for similar configurations at different plants could result in potentially significant quantitative variations. Furthermore, application of the Code Case is inconsistent with NRCs responsibility for determining whether examinations are impractical, and eliminates the NRCs ability to take exception to a licensees proposed action and impose additional measures where warranted in accordance with 10 CFR 50.55a(g)(6)(i).

DG-1193, Page 14

Code Case Table 2 Date or Number Unacceptable Section XI Code Cases Supplement/

Edition Summary N-716 Alternative Piping Classification and Examination Requirements, 9/04E Section XI, Division 1 The NRC has approved risk-informed inservice inspection programs based, in part, on methods described in Code Case N-716. The NRC has approved programs for Grand Gulf Nuclear Station 1 (September 21, 2007; ML072430005) , Donald C. Cook Nuclear Plant (September 28, 2007; ML072620553), and Waterford Steam Electric Station (April 28, 2008; ML080980120). The approvals were specific to these units and relied on several changes to the methodology described in Code Case N-716. It is anticipated that changes will be made to the Code Case. The staff will consider the revised Code Case for generic approval when it is published by the ASME.

N-729 Alternative Examination Requirements for PWR Reactor Vessel Upper 7/04E Heads With Nozzles Having Pressure-Retaining Partial-Penetration Nozzles,Section XI, Division 1 Code Case N-729 has been superseded by Revision 1 to the Code Case.

N-729-1 is conditionally approved directly in 10 CFR 50.55a and not through Regulatory Guide 1.147.

N-740 Dissimilar Metal Weld Overlay for Repair of Class 1, 2, and 3 Items, 11/04E Section XI, Division 1 Revision 2 to the Code Case is currently under development by Section XI. Revision 1 has been published, but the NRC staff has many issues with Revisions 0 and 1. The issues have been communicated to the cognizant Section XI committees, and the staff continues to work with the committees to resolve the issues. Due to the total number of issues and the nature of some (e.g., lack of certain fundamental design details), the staff believes that it would be inappropriate to attempt to conditionally approve either version 0 or 1 in Regulatory Guide 1.147. The staff will consider Revision 2 for approval when it is published by the ASME.

DG-1193, Page 15

Code Case Table 2 Date or Number Unacceptable Section XI Code Cases Supplement/

Edition Summary N-747 Reactor Vessel Head-to-Flange Weld Examinations,Section XI, 9/04E Division 1 Alternatives to current ISI requirements that use a probabilistic risk assessment (PRA) as a basis must initially be submitted as a risk-informed ISI program relief request in accordance with 10 CFR 50.55a(a)(3)(i), i.e.,

on a plant-specific basis and not on a generic basis.

As a general comment, the NRC staff finds that the technical basis is too qualitative. Three specific issues are provided to highlight additional concerns. First, no supporting fluence assessment or documentation to establish a conservative neutron fluence estimate for these welds and a conservative RTndt value for the welds is provided. Thus, there is no data to support a conclusion that the fracture toughness is low. Second, the methods in Appendix G to Section XI apply only to pressure-temperature limit methods and not to ISI inspection requirements. Third, the technical basis appears to credit K-1C twice - once to support the fracture toughness analysis and again in the Section XI Appendix A flaw growth analysis.

DG-1193, Page 16

3. Unacceptable OM Code Cases The following OM Code Cases were determined to be unacceptable for use by licensees in their inservice testing programs. The ASME issues OM Code Cases annually with publication of a new edition or addenda. No new OM Code Cases were added in this revision. To assist users of the OM Code, Column 3 of Table 3 lists the edition or addenda to which each Code Case was attached (E: edition; A: addenda), and whether the Code Case is new or reaffirmed.

Table 3. Unacceptable OM Code Cases Code Case Table 3 Edition/

Number Unacceptable OM Code Cases Addenda Summary of Basis for Exclusion OMN-10, Rev. 0 Requirements for Safety Significance Categorization of Snubbers Using July 1, 2000A Risk Insights and Testing Strategies for Inservice Testing of LWR Power Plants The method used for categorizing snubbers could result in certain snubbers being inappropriately categorized as having low safety significance. These snubbers would not be adequately tested or inspected to provide assurance of their operational readiness. In addition, unexpected extensive degradation in feedwater piping has occurred which would necessitate a more rigorous approach to snubber categorization than presently contained in this Code Case.

D. IMPLEMENTATION The purpose of this section is to provide information to applicants and licensees regarding the NRC staff=s plans for using this regulatory guide. This regulatory guide does not approve the use of the Code Cases listed herein. Licensees may submit a plant-specific request to implement one or more of the Code Cases listed in this regulatory guide. The request must address the NRC=s concerns about the Code Case at issue.

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REFERENCES

1. Code of Federal Regulations, Title 10, Energy, Part 50, ADomestic Licensing of Production and Utilization Facilities@ (10 CFR Part 50), U.S. Nuclear Regulatory Commission, Washington, DC.1
2. ASME Boiler and Pressure Vessel Code,Section III, ARules for Construction of Nuclear Power Plant Components,@ Division I; and Section XI, ARules for Inservice Inspection of Nuclear Power Plant Components,@ American Society of Mechanical Engineers, New York, NY.2
3. ASME Code for Operation and Maintenance of Nuclear Power Plants, American Society of Mechanical Engineers, New York, NY.2
4. Regulatory Guide 1.84, ADesign, Fabrication, and Materials Code Case Acceptability, ASME Section III,@ U.S. Nuclear Regulatory Commission, Washington, DC.3
5. Regulatory Guide 1.147, AInservice Inspection Code Case Acceptability, ASME Section XI, Division 1,@ U.S. Nuclear Regulatory Commission, Washington, DC.3
6. Paperwork Reduction Act of 1995 (Public Law 104-13), United States Code, Title 44, APublic Printing and Documents,@ Chapter 35, ACoordination of Federal Information Policy@ (44 U.S.C. 3501 et seq.),

104th Congress of the United States of America, Washington, DC.4

7. Miller, C.D., ASummary of Buckling Tests on Fabricated Steel Cylindrical Shells in USA,@ in Offshore Structures Engineering III: Buckling of Shells in Offshore Structures, J.E. Harding, P.J. Dowling, and N. Agelidis, eds., Gulf Publishing Company, Houston, TX, pp. 429B447, 1982.

1 All NRC regulations listed herein are available electronically through the Public Electronic Reading Room on the NRC=s public Web site, at http://www.nrc.gov/reading-rm/doc-collections/cfr/. Copies are also available for inspection or copying for a fee from the NRC=s Public Document Room at 11555 Rockville Pike, Rockville, MD; the PDR=s mailing address is USNRC PDR, Washington, DC 20555; telephone (301) 415-4737 or (800) 397-4209; fax (301) 415-3548; email PDR@nrc.gov.

2 Copies may be purchased from the American Society of Mechanical Engineers, Three Park Avenue, NewYork, NY 10016-5990; phone (212) 591-8500; fax (212) 591-8501; www.asme.org.

3 All regulatory guides listed herein are available electronically through the Electronic Reading Room on the NRC=s public Web site at http://www.nrc.gov/reading-rm/doc-collections/reg-guides/. Active guides may be purchased from the National Technical Information Service (NTIS). Details may be obtained by contacting NTIS at 5285 Port Royal Road, Springfield, Virginia 22161, online at http://www.ntis.gov, by telephone at (800) 553-NTIS (6847) or (703) 605-6000, or by fax to (703) 605-6900. Copies are also available for inspection or copying for a fee from the NRC=s Public Document Room (PDR), which is located at 11555 Rockville Pike, Rockville, Maryland; the PDR=s mailing address is USNRC PDR, Washington, DC 20555-0001. The PDR can also be reached by telephone at (301) 415-4737 or (800) 397-4209, by fax at (301) 415-3548, and by email to PDR@nrc.gov.

4 The Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.) is available electronically through the Federal Register Web site administered by the U.S. National Archives and Records Administration, at http://www.archives.gov/ federa-register/laws/paperwork-reduction/

DG-1193, Page 18

8. NRC Spent Fuel Project Office Interim Staff Guidance No. 4 (ISG-4), Rev. 1, ACask Closure Weld Inspections,@ U.S. Nuclear Regulatory Commission, Washington, DC.5
9. Code of Federal Regulations, Title 10, Energy, Part 72, ALicensing Requirements for the Independent Storage of Spent Nuclear Fuel, High-Level Radioactive Waste, and Reactor-Related Greater than Class C Waste@ (10 CFR Part 72), U.S. Nuclear Regulatory Commission, Washington, DC.
10. ARecommendations for an Effective Flow-Accelerated Corrosion Program@ (NSAC-202L-R3),

Electric Power Research Institute, Palo Alto, CA.6

11. Code of Federal Regulations, Title 10, Energy, Part 71, APackaging and Transportation of Radioactive Material@ (10 CFR Part 71), U.S. Nuclear Regulatory Commission, Washington, DC.
12. Mitchell, M.. letter to Libra, R., December 19, 2007, Safety Evaluation of Proprietary EPRI Report, "BWR Vessel and Internals Project, Technical Basis for the Reduction of Inspection Requirements for the Boiling Water Reactor Nozzle-to-Vessel Shell Welds and Nozzle Inner Radius (BWRVIP-108)," ADAMS Accession Number ML073600374.
13. NRC Spent Fuel Storage and Transportation Division Interim Staff Guidance No. 18 (ISG-18)

Rev. 1, The Design and Testing of Lid Welds on Austenitic Stainless Steel Canisters as Containment Boundary for Spent Fuel Storage, U.S. Nuclear Regulatory Commission, Washington, D.C.

5 This interim staff guidance is available electronically through the NRC=s Agencywide Documents Access and Management System (ADAMS), http://www.nrc.gov/reading-rm/adams.html, under Accession Number ML051520313.

6 Copies may be purchased from the Electric Power Research Institute (EPRI), 3420 Hillview Ave., Palo Alto, California 94304; telephone (800) 313-3774; fax (925) 609-1310.

DG-1193, Page 19

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