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:
Also, the reviewer should consider significant lessons learned from operating experience problems and insights gained from the PRA for the standard design. 1. GDC 17, in part, requires that an onsite and an offsite electric power system be provided to permit functioning of structures, systems and components important to safety. It further requires that the onsite electric power system have independence and redundancy and the electric power supplied by the offsite system be supplied by two physically independent circuits. 2. 10 CFR 50.49 requires that certain electrical equipment be qualified for accident (referred to as harsh) environments. 3. 10 CFR 50.63 requires that a nuclear power plant be able to withstand and recover from a station blackout event. 4. IEEE 308 "IEEE Standard Criteria for Class 1E power Systems for Nuclear Power Generating Stations," in conjunction with other related IEEE standards, establish specific design criteria for nuclear power plant electrical systems and equipment. 14.3.6-3 DRAFT Rev. 0 - April 1996 The staff's review of the standard plant is conducted to ensure, in part, that Tier 1 contains top level design, fabrication, testing, and performance requirements for SSCs important to safety. Design descriptions and ITAAC should be established to verify that these top level requirements (or design commitments) are met when the plant is built. Class 1E Electrical Systems The standard design Class 1E electrical systems may include: (1) the Class 1E electrical power distribution system, (2) the emergency diesel generators, (3) the Class 1E direct current power supply, and (4) the Class 1E vital ac and Class 1E instrument and control power supplies. Using the above regulations, IEEE standards, operating experience, and PRA as its bases, the 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