Document: NUREG-0800
Document ID: 9c59dff8-9325-43e2-8e81-843a0f6b4b2f
Document Type: srp
Title: and Regulatory Guide 1.189.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0327/ML032740044.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1
CFR Part: 
CFR Title: 

Content:
, including major assumptions, the role of expert judgment, and the identification and evaluation of sources of data uncertainties. A discussion of each case where the plant-specific data used is less conservative than the data base used in the approved fire vulnerability methodologies. • A discussion of the effects of fire growth and propagation, the transport and effects of hot gases and smoke, and the analysis of detection and suppression systems and their associated assumptions, including the treatment of suppression-induced damage to equipment. • A discussion of fire damage modeling, including the definition of fire-induced failures related to fire barriers and control systems and fire-induced damage to cabinets. A discussion of how human intervention is treated and how fire-induced and non-fire-induced failures are combined. Identify recovery actions and types of fire mitigating actions taken credit for in these sequences. • Discuss the treatment of detection and suppression, including fire fighting procedures, fire brigade training and adequacy of existing fire brigade equipment, and treatment of access routes versus existing barriers. • All functional/systemic event trees associated with fire initiated sequences. • A description of dominant functional/systemic sequences leading to core damage along with their frequencies and percentage contribution to overall fire core damage frequencies. Sequence selection criteria are provided in GL 88-20 and NUREG-1335. The description of the sequences should include a discussion of specific assumptions and human recovery action. • The estimated core damage frequency, the timing of the associated core damage, a list of analytical assumptions including their bases, and the sources of uncertainties. • Any fire induced containment failures. Licensees may use PRA and/or risk insights gained from other methods in support of proposed changes to the plant licensing basis, such as license amendment requests per 10