Document: NUREG-0800
Document ID: a28650b3-fa03-428d-a2bd-4a27f583710b
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070484.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6
CFR Part: 
CFR Title: 

Content:
ovides specific criteria for the design of containment instrumentation which have been found acceptable by the NRC as fulfilling the requirements of GDC 64. Meeting GDC 64 and the specific guidance of 6.2.1.1.C-9 DRAFT Rev. 7 - April 1996 Regulatory Guide 1.97 will assist operators in ensuring that containment meets its safety function of preventing the release of radioactivity to the environment. 7. 10 CFR 50.34(f)(3)(v)(A)(1) requires that the containment be designed to withstand either hydrogen burning or initiation of the post-accident inerting system, if installed, during an accident that releases hydrogen from a 100% fuel clad metal-water reaction. During the accident at TMI-2, metal-water reactions generated hydrogen in excess of the amounts originally anticipated. As a result of this finding, the Commission issued requirements on hydrogen control in 10 CFR 50.34(f). Other criteria require the containment to be designed to withstand postulated accidents. If such a postulated accident releases or generates hydrogen, an added containment pressurization effect beyond the initial accident may be experienced due to burning of hydrogen or initiation of the post-accident inerting system, if installed. In accordance with this regulation, the containment must be designed to withstand this additional pressure to ensure that its integrity is maintained, thus precluding the release of radioactivity to the environment. 8. 10 CFR 50.34(f)(3)(v)(B)(1) requires that the containment be designed to withstand inadvertent actuation of the post-accident inerting system, if installed. 10 CFR 50.34(f) promulgates hydrogen control requirements which include the option of a post-accident inerting system. A post-accident inerting system floods containment with an inert gas, such as carbon dioxide, during a hydrogen releasing accident. If inadvertently actuated during normal operation, containment could potentially be pressurized by the inerting system. In accordance with this