Document: NRC Regulatory Guide
Document ID: da269da5-7390-4252-b08f-bdb7aeb8beaf
Document Type: regulatory_guide
Title: Developing Principal Design Criteria for Non-Light Water Reactors + HISTORY - HISTORY 02/2017 – DG-1330 , Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1630/ML16301A307.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.232
CFR Part: 
CFR Title: 

Content:
ed experience and experimental data available for defining accident phenomena and containment responses, and (3) the conservatism of the calculational model and input parameters SFR-DC 50 specifically addresses a containment structure in the opening sentence and SFR-DC 51–57 support the containment structure’s design basis. Therefore, SFR-DC 51–57 are modified by adding the word “structure” to highlight the containment structure- specific criteria. The phrase “loss-of-coolant accident” is LWR specific because this is understood to be the limiting containment structure accident for an LWR design. It is replaced by the phrase “postulated accident” to allow for consideration of the design-specific containment structure limiting accident for non-LWR designs. The example at the end of subpart 1 of the ARDC is LWR specific and therefore deleted 51 Fracture prevention of containment pressure boundary. Same as ARDC The boundary of the reactor containment structure shall be designed with sufficient margin to ensure that, under operating, maintenance, testing, and postulated accident conditions, (1) its materials behave in a nonbrittle manner and (2) the probability of rapidly propagating fracture is minimized. The design shall reflect consideration of service temperatures and other conditions of the containment boundary materials during operation, maintenance, testing, and postulated accident conditions, and the uncertainties in determining (1) material properties, (2) residual, steady-state, and transient stresses, and (3) size of flaws. SFR-DC 51–57 support SFR-DC 50, which specifically applies to non-LWR designs that use a fixed containment structure. Therefore, the word “structure” is added to each of these SFR-DC to clearly convey the understanding that this criterion applies to designs employing containment structures. The term “ferritic” was removed to avoid limiting the scope of the criterion to ferritic materials. With this revision, the