Document: NUREG-0800
Document ID: d9e9d0a9-6390-4154-94dc-7d5e6d8145cd
Document Type: srp
Title: A-C POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350489.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
he operation of safety-related loads and systems. The PSB reviews the instrumentation, control, and electrical aspects of the vital supporting systems to ensure that their design conforms to. the same criteria as those for the systems that they support. Hence, the review procedure to be followed for ascertaining the adequacy of the vital supporting systems is the same'as that discussed herein for the onsite systems.. In essence, the reviewer first becomes .familiar with the purpose and operation of each vital supporting system, including its components arrangement as depicted on functional P&IDs. Subsequently, the design criteria, analyses, and description and implementation of the instrumentation, control and electrical equipment, as depicted on electrical drawings, are 8.3.1-16 Rev. 2 - July 1981 reviewed to verify that the- design -is consistent with satisfying the acceptance criteria for Class 1E systems. In addition, it is verified that the vital supporting system redundant instrumentation, control devices, and loads are examined to verify that they are powered from the same redundant distribution system as the system i that they support. The PSB will also verify that the vital supporting systems which are associated with the emergency diesel engine such as the fuel oil storage and transfer system, cooling water system, starting air system and lubrication system are in accordance with the acceptance criteria. The ASB reviews the other aspects of the vital supporting systems to verify'that the design, capacities, and physical independence of these systems are adequate for their intended functions. Included is a review of the heating and ventilation (H&V) systems identified as necessary to Class lE-systems, such as the H&V systems for the electrical switchgear and diesel generator rooms. The ASB will verify the adequacy of the H&V system design to maintain the temperature and relative humidity in the room required for proper operation of the safety equipment