Document: NUREG-0800
Document ID: e1169529-d2cb-4947-9efe-b23d927f4aa9
Document Type: srp
Title: NUREG40800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350520.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8
CFR Part: 
CFR Title: 

Content:
Electrically-operated valves that are classified as "active" valves, i.e., are required to open or close in various safety system operational sequences, but are manually-controlled should be operated from the main control room. Such valves may not be included among those valves from which power is removed in order to meet the single failure criterion unless: (a) electrical power can be restored to the valves from the main control room, (b) valve operation is not necessary for at least ten minutes following occurrence of the event requiring such operation, and 8A-10 Rev. 2 - July 1981 (c) it is demonstrated that there is reasonable assurance that all necessary operator actions will be performed within the time shown to be adequate by the analysis. The plant technical specifications should include a list of the required positions of manually-controlled, electrically-operated valves and should identify those valves to which the requirement for removal of electric power is applied in order to satisfy the single failure criterion. 4. When the single failure criterion is satisfied by removal of electrical power from valves described in 2. and 3., above, these valves should have redundant position indication in the main control room and the position indication system should, itself, meet the single failure criterion. 5. The phrase "electrically-operated valves" includes both valves operated directly by an electrical device (e.g., a motor-operated valve or a solenoid-operated valve) and those valves operated indirectly by an electrical device (e.g., an air-operated valve whose air supply is con- trolled by an electrical solenoid valve). C. REFERENCES None. SAppaln Rev. 2 - July 1981 BRANCH TECHNICAL POSITION ICSB-21 GUIDANCE FOR APPLICATION OF REGULATORY GUIDE 1.47 A. BACKGROUND The guidance of Regulatory Guide 1.47 needs further detailing as to methods of providing an acceptable design for the bypass and inoperable status indicators for engineered safety feature (ESF)