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
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heating for prevention of possible freezing and assure that adequate redundancy and other appropriate measures have been implemented, to preclude inadvertent effects caused by adverse conditions. The guidance provided in Regulatory Guide 1.151, "Instrument Sensing Lines," should be followed in this regard.112 3.11-11 DRAFT Rev. 3 - April 1996 Technical Rationale: The technical rationale for application of these acceptance criteria to reviewing the environmental qualification of mechanical and electrical equipment is discussed in the following paragraphs:113 1. Compliance with General Design Criterion 1 (GDC 1), "Quality Standards and Records," requires that components important to safety be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the safety function to be performed. SRP Section 3.11 describes staff positions related to the environmental qualification of electrical and mechanical equipment important to safety. This section cites a number of regulatory guides and industry standards, including NUREG-0588, Regulatory Guide 1.89, and IEEE Std 323, to establish environmental qualification levels for equipment that are commensurate with the safety functions to be performed. Meeting the requirements of GDC 1 provides assurance that equipment important to safety will be environmentally qualified and will be capable of performing its intended safety function.114 2. Compliance with General Design Criterion 2 (GDC 2), "Design Bases for Protection Against Natural Phenomena," requires that components important to safety be designed to withstand the effects of natural phenomena without loss of capability to perform their safety function. The design bases for these components must include considering the effects of normal and accident conditions (i.e., environmental qualification) along with the importance of the safety function to be performed and the effects of natural phenomena. SRP Section 3.11 describes staff