Document: NUREG-0800
Document ID: 1ee704a4-ae61-4af0-8158-c68006e8528a
Document Type: srp
Title: and 3.8.2, which apply to the other Category I concrete and steel structures,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1006/ML100630323.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.1
CFR Part: 
CFR Title: 

Content:
f critical areas. The staff considers that monitoring and maintaining the condition of other Category I structures is essential for plant safety. The staff reviews 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 other Category I structures on a case-by-case basis. 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 exposed portions of below-grade concrete, when excavated for any reason, for signs of degradation; and (2) conduct periodic site monitoring of ground water chemistry, to confirm that the ground water remains nonaggressive. For plants with aggressive ground water/soil (i.e., it exceeds any of the limits noted above), an acceptable approach is to implement a periodic surveillance program to monitor the condition of normally inaccessible, below-grade concrete for signs of degradation. 8. Masonry Walls. Appendix A to this SRP section contains the acceptance criteria for masonry walls. 3.8.4-13 Revision 3 – May 2010 Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. Compliance with 10 CFR 50.55a requires that SSCs be designed, fabricated, erected, constructed, tested, and inspected to quality standards commensurate with the importance of the safety function to be performed. This section of the SRP cites RGs 1.69, 1.91, 1.115, 1.142, 1.143, 1.160, and 1.199 to provide guidance regarding construction, quality control, tests, and inspections that are acceptable to the staff. ACI 349, as supplemented by RG 1.142, and ANSI/AISC N690-1994,