Document: 10 CFR Part 50
Document ID: 1c9db254-4b16-4016-8411-63ac96dc3718
Document Type: cfr
Title: Environmental qualification of electric equipment important to safety for nuclear power plants.
Source: 10 CFR Part 50
Source URL: https://www.ecfr.gov/current/title-10/part-50/section-50.49
Revision Date: 
Chapter: 
Section ID: 50.49
CFR Part: 50
CFR Title: 10

Content:
ude, where appropriate, consideration of: ( 1 ) Accomplishing the safety function by some designated alternative equipment if the principal equipment has not been demonstrated to be fully qualified. ( 2 ) The validity of partial test data in support of the original qualification. ( 3 ) Limited use of administrative controls over equipment that has not been demonstrated to be fully qualified. ( 4 ) Completion of the safety function prior to exposure to the accident environment resulting from a design basis event and ensuring that the subsequent failure of the equipment does not degrade any safety function or mislead the operator. ( 5 ) No significant degradation of any safety function or misleading information to the operator as a result of failure of equipment under the accident environment resulting from a design basis event. ( j ) A record of the qualification, including documentation in paragraph (d) of this section, must be maintained in an auditable form for the entire period during which the covered item is installed in the nuclear power plant or is stored for future use to permit verification that each item of electric equipment important to safety covered by this section: ( 1 ) Is qualified for its application; and ( 2 ) Meets its specified performance requirements when it is subjected to the conditions predicted to be present when it must perform its safety function up to the end of its qualified life. ( k ) Applicants for and holders of operating licenses are not required to requalify electric equipment important to safety in accordance with the provisions of this section if the Commission has previously required qualification of that equipment in accordance with “Guidelines for Evaluating Environmental Qualification of Class 1E Electrical Equipment in Operating Reactors,” November 1979 (DOR Guidelines), or NUREG-0588 (For Comment version), “Interim Staff Position on Environmental Qualification of Safety-Related Electrical Equipment.” ( l )