Document: NUREG-0800
Document ID: 63521156-eb6b-472c-9560-1e85462dc1be
Document Type: srp
Title: ENVIRONMENTAL QUALIFICATION OF MECHANICAL AND ELECTRICAL
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070288.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.11
CFR Part: 
CFR Title: 

Content:
s described under the acceptance criteria of this Standard Review Plan (SRP) section. Mechanical and electrical equipment covered by this 13 SRP section includes equipment associated with systems that are essential to emergency reactor shutdown, containment isolation, reactor core cooling, and containment and reactor heat removal, or otherwise are essential in preventing significant release of radioactive material to the environment. Also The following items are also covered by this SRP section is:14 (1) Equipment that performs the above functions automatically, (2) Equipment that is used by the operators to perform these functions manually, and (3) Equipment whose failure can prevent the satisfactory accomplishment of one or more 15 of the above safety functions, (4) Other electrical equipment important to safety as described in 10 CFR 50.49(b)(1) and (2), and (5) Certain postaccident monitoring equipment as described in 10 CFR 50.49(b)(3).16 Seismic qualification is addressed in SRP Section 3.10.17 Section 3.11 of the SAR is reviewed to determine whether the required environmental capability of all equipment, i.e., the capability to perform design safety functions in the event of anticipated operational occurrences and under normal, abnormal, accident, and postaccident environments, 18 will be or has been adequately demonstrated. The term "environmental qualification" means verification of design, limited to demonstrating that electrical or mechanical equipment is capable of performing its safety function under significant environmental stresses resulting from design basis accidents in order to avoid common-cause failure.19 At the construction permit (CP) stage, the staff review will consider the conceptual approach addressing the following areas: 1. Identification of all mechanical and electrical systems required to perform the functions defined in paragraph 1 of subsection Ithe second paragraph of subsection I.20 2. Identification of the environmental design