Document: NUREG-0800
Document ID: 92ba0daf-489d-4f71-82db-d6d781c71573
Document Type: srp
Title: as an aid for establishing consistency and comprehensiveness in the review of the systems.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070664.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3
CFR Part: 
CFR Title: 

Content:
applicant should establish top-level design commitments for the Class 1E electrical systems of the standard design to be included in the design descriptions and verified by ITAAC. The top-level design commitments for the Class 1E electrical systems include design aspects related to: 1. Equipment qualification for seismic and harsh environment To ensure that the seismic design requirements of GDC 2 and the environmental qualification requirements of 10 CFR 50.49 have been adequately addressed, a "basis configuration" standard ITAAC may be established for applicable systems to verify these design aspects of electrical equipment important to safety. The design description should identify that Class 1E equipment is seismic Category 1 and equipment located in a harsh environment is qualified. The basic configuration standard ITAAC may be used to verify these areas. 2. Redundancy and independence To ensure that the Class 1E electric systems meet the single failure requirements of GDC 17 (and other GDC), ITAAC may be established to verify the redundancy and independence of the Class 1E portion of the electrical design. For the electrical systems, ITAAC should verify the Class 1E divisional assignments and independence of electric power by both inspections and tests. The independence may be established by both electrical isolation and physical separation. Identification of the Class 1E divisional equipment should be included to aid in demonstrating the separation. (The detailed requirements are specified in Tier 2. For example, separation distances and identification are outlined in Tier 2.) These attributes should be verified all the way to the electrically powered loads by a combination of the electrical system ITAAC and the ITAAC of the individual fluid, I&C, and HVAC systems which also cover the electrical independence and divisional power supply requirements. 3. Capacity and capability To ensure that the electrical systems have the capacity and capability to supply the