Document: NUREG-0800
Document ID: 0c95c042-addf-4bad-84f5-1d1692769268
Document Type: srp
Title: CONCRETE AND STEEL INTERNAL STRUCTURES OF STEEL OR CONCRETE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550052.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.3
CFR Part: 
CFR Title: 

Content:
ch 2007 iv. Secondary Shield Walls The secondary shield walls surrounding the primary loops form the steam generator compartments and protect the containment from the effects of pipe rupture accidents inside the compartment. These walls may also support intermediate floors and the operating floor. The review evaluates the general arrangement and principal features of these walls, with an emphasis on the method of structural framing and expected behavior under compartment pressure loads and jet forces, particularly those associated with a LOCA. v. Other Interior Structures The review also evaluates other major interior structures of PWR dry containments in a similar manner, including the concrete refueling pool walls, refueling water storage tank (if applicable), the operating floor, other intermediate floors and platforms, and the polar crane supporting elements. B. PWR Ice-Condenser Containment Internal Structures The following elements, in addition to the applicable structures reviewed in dry PWR containments, are reviewed for PWR plants using an ice-condenser containment system: i. The Divider Barrier In the PWR ice-condenser containment system, which uses 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, while 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, thus minimizing the energy released to the containment. Following such a LOCA and before blowdown is complete, the divider barrier will be subjected to differential