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:
mechanical equipment. These staff positions reference the requirements in IEEE Std 323, NUREG-0588, and Regulatory Guide 1.89. The scope of IEEE Std 323 includes principles, procedures, and methods of qualification applicable to the adequacy of equipment design under normal, design basis, and post-design basis events as well as anticipated operational occurrences. NUREG-0588 provides environmental qualification parameters for equipment located inside or outside containment and references IEEE Std 323. Regulatory Guide 1.89 references the 10 CFR 50.49 and provides additional guidance related to the environmental qualification of electrical equipment that could be subjected to a harsh environment as a result of the conditions addressed in GDC 4. Meeting the requirements of GDC 4 provides assurance that equipment important to safety will be environmentally qualified and will be capable of performing its intended safety function.116 4. Compliance with General Design Criterion 23 (GDC 23), "Protection System Failure Modes," requires that the protection system be designed to fail in a safe state, or in a state demonstrated to be acceptable on some other defined basis, if conditions such as postulated adverse environments (e.g., extreme heat or cold, pressure, steam, water, or radiation) are experienced. SRP Section 3.11 describes staff positions related to the environmental qualification of electrical and mechanical equipment important to safety. These staff positions require that applicants consider all normal, accident, and postaccident environments (including anticipated operational events) in the design, testing, and quality assurance of this equipment, which includes the protection system. Electrical equipment exposed to harsh environmental conditions must meet the requirements of 10 CFR 50.49. Regulatory Guide 1.89 provides additional guidance and references the requirements specified in IEEE Std 323. These requirements relate directly to ensuring the acceptable