Document: NUREG-0800
Document ID: 91fee075-c567-438d-bf9f-47be3177b457
Document Type: srp
Title: ENGINEERED SAFETY FEATURES MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070453.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.1.1
CFR Part: 
CFR Title: 

Content:
ned in the event of a LOCA. 6. GDC 41 requires that systems be provided to control the concentration of hydrogen in the containment atmosphere following postulated accidents to assure that containment integrity is maintained. If hydrogen gas were to accumulate in explosive concentrations inside the reactor containment, ignition or detonation of the gas could threaten or breach this fission product barrier. Containment atmosphere cleanup is an ESF function. Appropriate selection of ESF materials and fluids enhances the ability to reliably perform containment atmosphere cleanup functions, including hydrogen control. ESF materials and fluids, as well as other materials used in containment, are also selected to limit the quantity of hydrogen gas generated following postulated accidents. Application of GDC 41 thus assures that following postulated accidents, concentrations of hydrogen gas will not accumulate which could threaten or breach the containment fission product barrier. 7. Appendix B of 10 CFR Part 50 requires, in Criterion IX, that measures be established to assure that special processes, including welding, heat treating, and nondestructive testing, are controlled and accomplished by qualified personnel using qualified procedures in accordance with applicable codes, standards, specifications, criteria, and other special requirements. ESF functions include emergency core cooling, reactivity control, fission product containment, and heat removal to an ultimate heat sink. These functions are provided to establish, maintain, and/or protect barriers against the release of fission products. Application of special process control requirements provides assurance that implementation of special processes will not introduce conditions adverse to quality in ESF systems including, but not limited to, damage or deterioration of ESF and/or RCPB materials and pressure boundaries, alteration of critical material properties, acceleration of effects associated with aging, flow