Document: NUREG-0800
Document ID: 0f097ac2-b7b1-437d-a055-1546a9094ef6
Document Type: srp
Title: CONCRETE CONTAINMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1006/ML100620888.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.1
CFR Part: 
CFR Title: 

Content:
tural proof test proposed for the containment are acceptable if found in accordance with those delineated in Article CC- 6000 of the ASME Code. B. For reinforced and prestressed concrete containments, 10 CFR 50.55a imposes the examination requirements of Section XI, Subsections IWL and IWE, of the ASME Code. These subsections provide preservice examination, inservice inspection, and repair/replacement requirements, and acceptance criteria. The scope of Subsection IWL includes the concrete and unbonded posttensioning systems. Subsection IWE covers examination requirements for steel liners of concrete containments and their integral attachments; metallic shell portions of containment (e.g., steel head); containment hatches and airlocks; seals, gaskets and moisture barriers; and pressure-retaining bolting. The regulations in 10 CFR 50.55a(b)(2) specify the acceptable edition of the ASME Code and additional requirements beyond those contained in these subsections of the ASME Code. 10 CFR 55a (b)(2)(viii)(E) requires that licensee shall evaluate the acceptability of inaccessible areas when conditions exist in accessible areas that could indicate the presence of, or result in, degradation to such inaccessible areas. C. For concrete containments, it is important to accommodate inservice inspection of critical areas. The staff considers that monitoring and maintaining the condition of containments is essential for plant safety. The staff reviews on a case-by-case basis any special design provisions (e.g., providing sufficient physical access, providing alternative means for identification of conditions in inaccessible areas that can lead to degradation, remote visual monitoring of high radiation areas) to accommodate inservice inspection of containments. For plants with nonaggressive ground water/soil (i.e., pH > 5.5, chlorides < 500 ppm, sulfates <1500 ppm), an acceptable program for normally inaccessible, below-grade concrete walls and foundations is to (1) examine the