Document: 10 CFR Part 50
Document ID: e5e51d71-6583-44f4-85e4-1d59c4ed1c3c
Document Type: cfr
Title: Combustible gas control for nuclear power reactors.
Source: 10 CFR Part 50
Source URL: https://www.ecfr.gov/current/title-10/part-50/section-50.44
Revision Date: 
Chapter: 
Section ID: 50.44
CFR Part: 50
CFR Title: 10

Content:
ion of hydrogen control measures as appropriate; ( ii ) Includes the period of recovery from the degraded condition; ( iii ) Uses accident scenarios that are accepted by the NRC staff. These scenarios must be accompanied by sufficient supporting justification to show that they describe the behavior of the reactor system during and following an accident resulting in a degraded core. ( iv ) Supports the design of the hydrogen control system selected to meet the requirements of this section; and, ( v ) Demonstrates, for those reactors that do not rely upon an inerted atmosphere to comply with paragraph (b)(2)(ii) of this section, that: ( A ) Containment structural integrity is maintained. Containment structural integrity must be demonstrated by use of an analytical technique that is accepted by the NRC staff in accordance with § 50.90 . This demonstration must include sufficient supporting justification to show that the technique describes the containment response to the structural loads involved. This method could include the use of actual material properties with suitable margins to account for uncertainties in modeling, in material properties, in construction tolerances, and so on; and ( B ) Systems and components necessary to establish and maintain safe shutdown and to maintain containment integrity will be capable of performing their functions during and after exposure to the environmental conditions created by the burning of hydrogen, including local detonations, unless such detonations can be shown unlikely to occur. ( c ) Requirements for future water-cooled reactor applicants and licensees. [ 2 ] The requirements in this paragraph apply to all water-cooled reactor construction permits or operating licenses under this part, and to all water-cooled reactor design approvals, design certifications, combined licenses or manufacturing licenses under part 52 of this chapter , any of which are issued after October 16, 2003. ( 1 ) Mixed atmosphere. All containments