Document: NRC Regulatory Guide
Document ID: a4944d20-ef6e-480b-a45d-14425bedd2e5
Document Type: regulatory_guide
Title: ASME Code Cases Not Approved for Use (Rev. 8)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2219/ML22196A065.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.193
CFR Part: 
CFR Title: 

Content:
he OM Code. (3) The Code Case does not address the assignment of unacceptable snubbers in the failure mode group. (4) The Code Case does not address the treatment of isolated snubber failures. (5) The Code Case does not address how unacceptable snubbers are accounted for during the extended test interval. For example, unacceptable snubbers could be identified during maintenance, service life monitoring, and visual examination activities conducted during the extended test interval. Note: Code Case OMN-15, Revision 2 (2017 Edition), is approved for use in RG 1.192, Revision 3. 2004 Edition Revised 2006 Addenda 2009 Edition 2012 Edition DG-1408, Page 23 4. Annulled/Superseded Unacceptable Section III Code Cases The NRC had previously determined that the Code Cases listed in Table 4 were unacceptable for use by licensees in their Section III design and construction programs. These Code Cases have since been annulled by ASME or superseded by revised Code Cases. CODE CASE NUMBER TABLE 4 ANNULLED OR SUPERSEDED UNACCEPTABLE SECTION III CODE CASE ANNULLMENT / REVISION DATE N-201-6 Class CS Components in Elevated Temperature Service, Section III, Division 1 Code Case applies to high-temperature applications beyond that of light-water reactors (LWRs). 10/18/10 Annulled 11/8/12 N-284-1 Metal Containment Shell Buckling Design Methods, Section III, Division 1, Class MC (1) The following errata, misprints, recommendations, and errors have been identified:  Fig. 1511.1, The curve for αθL should not exceed 0.8 for any value of (R/t).  -1512, The statement, “See Fig. 1512-1 then see -1713.1.2 for method of calculating M,” should be rephrased as: “See -1713.1.2 for method of calculating M, then see Fig. -1512-1.”  -1513, Recommend, “Use the value of αil given for spherical shells in accordance with 1512.”  -1521, (i) In (a), Axial Compression, “αθG = αθL” should be changed to “αφG = αφL.” (ii) The source of the equations shown under “(a)