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:
adiation environment over the equipment's installed life, plus that associated with the most severe design basis event during or following which the equipment is required to remain functional. Effects of the beta radiation shall also be considered in the qualification program. Effects of recirculatory fluid shall be considered for the equipment located outside the containment. The staff's definition of what constitutes a mild radiation environment for electronic components such as semiconductors or electronic components containing organic material differs from that for other equipment. A mild radiation environment for electronic equipment is a total integrated dose less than 10 Gy (10 rad). A mild radiation environment for other equipment is less than 3 100 Gy (10 rad). 4 100 i. Regulatory Guide 1.156, "Environmental Qualification of Connection Assemblies for Nuclear Power Plants," provides guidance acceptable to the staff for implementing the requirements of IEEE Std 572, "IEEE Standard for Qualification of Class 1E Connection Assemblies for Nuclear Power Generating Stations," (Reference 12). These criteria as supplemented by those of Regulatory Guide 1.89 should be used to evaluate the environmental qualification of the connection assembly.101 j. The postaccident monitoring equipment described in subsection I(5), as well as instruments and controls for the equipment described in the second paragraph of subsection I, should be environmentally qualified in accordance with the guidance in Regulatory Guide 1.97, "Instrumentation for Light-Water-Cooled Nuclear Power Plants to Assess Plant and Environs Conditions During and Following an Accident."102 k. With regard to equipment qualification associated with possible hydrogen generation by a metal-water reaction of the fuel, the equipment needed to achieve and maintain safe shutdown of the plant and to maintain containment integrity should be environmentally qualified in accordance with the provisions of this SRP section