Document: NUREG-0800
Document ID: 47be7233-5326-4a7d-a9c5-f3b91d565a72
Document Type: srp
Title: MINIMUM CONTAINMENT PRESSURE ANALYSIS FOR EMERGENCY CORE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070492.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.1.5
CFR Part: 
CFR Title: 

Content:
h the steam while draining from the ice condenser into the lower containment volume. The effect of the steam-water mixing should be considered in the containment pressure calculations. 3. Passive Heat Sinks a. Identification The passive heat sinks that should be included in the containment evaluation model should be established by identifying those structures and components within the containment that could influence the pressure response. The kinds of structures and components that should be included are listed in Table 1. DRAFT Rev. 3 - April 1996 6.2.1.5-8 Data on passive heat sinks have been compiled from previous reviews and have been used as a basis for the simplified model outlined below. This model is acceptable for minimum containment pressure analyses for construction permit applications, and until such time (i.e., at the operating license review) that a complete identification of available heat sinks can be made. This simplified approach has also been followed for operating plants by licensees complying with Section 50.46(a)(2) of 10 CFR Part 50. For such cases, and for construction permit reviews, wWhere a detailed listing of heat sinks within the containment often cannot be provided, the following procedure may be used to model the passive heat sinks within the containment: 27 (1) Use the surface area and thickness of the primary containment steel shell or steel liner and associated anchors and concrete, as appropriate. (2) Estimate the exposed surface area of other steel heat sinks in accordance with Figure 12 and assume an average thickness of 28 9.53 mm (3/8 inch) . 29 (3) Model the internal concrete structures as a slab with a thickness of 30.5 cm (one foot) and exposed surface of 15,000 m (160,000 30 2 ft ) . 2 31 The heat sink thermophysical properties that would be acceptable are shown in Table 2. Applicants should provide a detailed list of passive heat sinks, with appropriate dimensions and properties. b. Heat Transfer Coefficients The