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:
ility of construction flaws. Additional performance demonstrations are needed to address acceptance criteria for procedures, personnel, and the UT equipment to be used for new fabrication/construction activities. 10/12/17 N-673 Boron Containing Power Metallurgy Aluminum Alloy for Storage and Transportation of Spent Nuclear Fuel, Section III, Division 1 Code Case N-673 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 8/7/03 Table 1. Unacceptable Section III Code Cases DG-1408, Page 7 CODE CASE NUMBER TABLE 1 UNACCEPTABLE SECTION III CODE CASES SUMMARY DATE OR SUPPLEMENT/ EDITION (3) uniform distribution of boron carbide in the aluminum matrix (4) mechanical properties for the use of the material in high-temperature conditions N-707-2 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 The NRC has not endorsed Section III, Division 3. Thus, it would not be appropriate to approve a Code Case that is an alternative to the provisions in Section III, Division 3. 0/21E N-761 Fatigue Design Curves for Light Water Reactor (LWR) Environments, Section III, Division 1 Research has shown that the effect of the environment on reactor components exposed to reactor water is not bounded by the current air fatigue curves. Bounding curves and a series of other curves for known strain rates have been developed to account for the reduction of fatigue life. • The proposed curves in Code Case N-761 for carbon and low-alloy steels (as shown in Figure 2 and Table 1 of the Code Case) and the curves for austenitic stainless steels (as shown in Figure 3 and Table 2 of the Code Case) are not acceptable because sufficient technical basis has not been provided. • These curves are developed based on a factor of 10 on cycles and a factor of 2 on stress, which