Document: NUREG-0800
Document ID: 808cea66-69b8-4f91-9fb2-62b3b99bc87a
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340579.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3
CFR Part: 
CFR Title: 

Content:
significant components of the ice-condenser reviewed are the vent doors, ice baskets, brackets, couplings and lattice framings, lower and upper supports, and insulating and cooling panels. The general arrangement and principal features of these major components are reviewed with emphasis on the structural framing, supports, and expected behavior when subjected to design loads. 3.8.3-3 Rev. 1 - July 1981 c. For BWR Containment Internal Structures Since it is expected that future BWR applications will utilize the Mark III containment concept, this SRP Section is oriented towards and based on this type of containment. For other types of BWR containments, the review will be made on a case-by-case basis. Among the major Mark III containment internal structures that are reviewed, together with the primary structural function of each structure, and the extent of descriptive information required for each structure, are the following: i. Drywell In the BWR Mark III containment system, which utilizes the pressure-suppression concept, the drywell surrounds the reactor coolant system. The lower portion of the drywell is surrounded by the suppression pool which is bounded by the containment shell on the outside and by a weir wall located just inside the drywell wall; A series of vent holes connect the drywell to the suppression pool. In the event of a loss-of-coolant acci- dent, the drywell will contain the steam released from the reactor coolant system and, temporarily acting as a pressure- retaining envelope, will channel the steam through the vent holes and into the suppression pool. The pool water will condense the steam and the energy released to the containment will thus be minimized. Following such a LOCA and before blowdown is completed, the drywell will be subjected to a differential pressure and pos- sibly jet forces, and any structural failure in its boundary would result in steam bypassing the suppression pool and flow- ing directly into the containment, possibly