Document: NRC Regulatory Guide
Document ID: 1fd6c427-a283-44d1-b442-31901b507b4a
Document Type: regulatory_guide
Title: Acceptability of ASME Code Section III, Division 5, 'High Temperature Reactors' (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2202/ML22026A517.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.87
CFR Part: 
CFR Title: 

Content:
the NRC’s “Regulatory Guide” series. This series was developed to describe methods that are acceptable to the NRC staff for implementing specific parts of the agency’s regulations, to explain techniques that the staff uses in evaluating specific issues or postulated events, and to describe information that the staff needs in its review of applications for permits and licenses. The proposed Revision 2 to RG 1.87, entitled “Acceptability of ASME Code Section III, Division 5, ‘High Temperature Reactors,’” is temporarily identified by its task number, DG-1380 (ADAMS Accession No. ML21091A276). Its regulatory analysis may be found in ADAMS under Accession No. ML21091A277. On August 20, 2021, the NRC published DG-1380 for public comment (86 FR 46888). DG-1380 endorsed, with conditions, the ASME Code Section III, Division 5, and Code Cases N-861 and N-862. Since then, the NRC staff has reviewed Code Cases N-872 and N-898 for potential endorsement. This supplemental notice for DG-1380 informs the public that the NRC staff is considering the endorsement of these two additional Code Cases in the final RG 1.87 (Revision 2) and provides supplemental information addressing the proposed endorsement and revisions. The technical basis for the NRC’s proposed endorsement of Code Cases N-872 and N-898 is contained in Technical Letter Report TLR- RES/DE/REB-2022-01, “Review of Code Cases Permitting Use of Nickel-Based Alloy 617 in Conjunction with ASME Section III, Division 5” (ML22031A137). 5 III. Request for Comment The NRC staff welcomes comments on the following proposed endorsement and revisions to DG-1380. In Section C of DG-1380, the staff is proposing to (1) add a new Table 1, “Acceptable ASME Code, Section III, Division 5 Code Cases,” to list Code Case N-872, which the staff proposes to endorse without conditions; (2) renumber what was previously designated as Table 1 in DG-1380 to Table 2, “Conditionally Acceptable ASME Code, Section III, Division