Document: NUREG-0800
Document ID: eb1d19c1-686c-42f5-ba0a-c417c7b12b8e
Document Type: srp
Title: DC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070499.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
ss 1E systems, such as the HVAC systems for the electrical switchgear, battery, charger, and inverter rooms. The SPLB will verify the adequacy of the HVAC system design to maintain the temperature and relative humidity in the room required for proper operation of the safety equipment during both normal and accident conditions. It will also verify that redundant HVAC systems are located in the same enclosure as the redundant unit they serve or are separated in accordance with the same criteria as those for the systems they support. 6. System Testing and Surveillance100 To ensure that the proposed periodic onsite testing capabilities of the safety-related dc power system satisfies the requirements of GDC 18 and the positions of Regulatory Guides 1.32 and 1.118, the descriptive information, functional logic diagrams, and 8.3.2-17 DRAFT Rev. 3 - April 1996 electrical schematics are reviewed to verify that the design has the built-in capability to permit integral testing of safety-related dc systems on a periodic basis when the reactor is in operation . The built-in capability for the testing recommended in Regulatory Guide 101 1.129 (see also IEEE Std 450) is also verified. Basic criteria relevant to the review of the surveillance and testability of the safety-related aspects of the dc power system is also described in IEEE Std 603 as endorsed by Regulatory Guide 1.153.102 The descriptive information and the design implementation as depicted on electrical drawings of the means proposed for automatically indicating at the system level a bypassed or deliberately inoperative status of a redundant portion of a safety-related system are reviewed to ascertain that the design is consistent with Regulatory Guide 1.47 and Branch Technical Position ICSB 21 (PSB). This position establishes the basis to be considered in arriving at an acceptable design for the inoperable status indication system.103 7. Station Blackout Events To ensure that plant systems have the capability and