Document: NUREG-0800
Document ID: ab4f353d-c299-479d-ab25-834f97196988
Document Type: srp
Title: CONCRETE AND STEEL INTERNAL STRUCTURES OF STEEL OR CONCRETE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070326.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.3
CFR Part: 
CFR Title: 

Content:
nt from the effects 8 of pipe rupture accidents inside the compartment. They may also support intermediate floors and the operating floor. The general arrangement and principal features of these walls are reviewed with emphasis on the method of structural framing and expected behavior under compartment pressure loads and jet forces, particularly those associated with the LOCA. v. Other Interior Structures The other major interior structures of PWR dry containments that are reviewed in a similar manner are the concrete refueling pool walls, the operating floor, other intermediate floors, and the polar crane supporting elements. b. For PWR Ice-condenser Containment Internal Structures For PWR plants where the ice-condenser containment system is utilized, in addition to the applicable structures reviewed in dry PWR containments, the following elements are also reviewed: i. The Divider Barrier In the PWR ice-condenser containment system, which utilizes the pressure-suppression concept, the divider barrier surrounds the reactor coolant system. The upper portion of the divider barrier is nearly surrounded by the ice-condenser, which is bounded by the containment shell on the outside and by the divider barrier wall on the inside. Several venting doors connect the space inside the divider barrier to the ice-condenser. In the event of a LOCA, the divider barrier will contain the steam released from the reactor coolant system and, temporarily acting as a pressure-retaining envelope, will channel the steam through the venting doors and into the ice-condenser. The ice 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 divider barrier will be subjected to differential pressure and possibly jet forceds,9 and any structural failure in its boundary may result in steam bypassing the ice-condenser and flowing directly into the containment, possibly generating a containment pressure