Document: NUREG-0800
Document ID: 846ded8e-04ea-4031-8f64-62690ca967b6
Document Type: srp
Title: ANTICIPATED TRANSIENTS WITHOUT SCRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070570008.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.8
CFR Part: 
CFR Title: 

Content:
Service Level C limits, are approximately 10.3 MPa (1500 psig) for BWRs and approximately 22MPa (3200 psig) for PWRs. iii. Maintain containment Integrity. Following a failure to scram, the containment pressure and temperature must be maintained at acceptably low levels based on GDC 16 and 38. The containment pressure and temperature limits are design dependent; but to satisfy GDC 50, those limits must ensure that containment design leakage rates are not exceeded when subjected to the calculated pressure and temperature conditions resulting from any ATWS event. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. 10 CFR 50.62 (the ATWS rule), as it relates to the acceptable reduction of risk from ATWS events via (a) inclusion of prescribed design features and (b) demonstration of their adequacy Meeting the ATWS rule (10 CFR 50.62) requires that light-water-cooled plants be equipped with systems and equipment that are designed to reduce risks attributable to ATWS events to an acceptable level. The rule also requires a demonstration of the adequacy of the features as specified in the staff requirements and the discussion contained in the statement of considerations of the final rule. 2. 10 CFR 50.46, as it relates to maximum allowable peak cladding temperatures, maximum cladding oxidation, and coolable geometry. The applicant’s design must satisfy limits derived from regulations at 10 CFR 50.46, which define specific core-coolability criteria, such as peak clad temperature, Maximum cladding oxidation and hydrogen generation, such as not to exceed certain limits as specified in specific acceptance criteria (Section II). 3. GDC 12 as it relates to ensuring that oscillations are either not possible or can be reliably and readily detected and suppressed. 4. GDC 13, as it relates to instrumentation used for ATWS mitigation systems. 5. GDC