Document: NRC Regulatory Guide
Document ID: 74c49394-8dbf-46e7-b62a-b85de93b47d8
Document Type: regulatory_guide
Title: Initial Test Programs for Water-Cooled Nuclear Power Plants + HISTORY - HISTORY 11/2012 – DG-1259 , Proposed Revision 4 11/2006 – DG-1166 , Proposed Revision 3 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1229/ML12298A071.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.68
CFR Part: 
CFR Title: 

Content:
ystems (ECCS)7, 8 a. Perform expansion and restraint tests. b. Demonstrate operability using normal and emergency power supplies. c. Demonstrate operability in all modes of operation, including design pump/system runout conditions and injection at required flow rate and pressure. d. Demonstrate operability of interlocks and isolation valves provided for overpressure protection for low-pressure cooling systems connected to the reactor coolant system. e. Demonstrate operability, including proper flow rates, for systems used to dilute boron in the reactor vessel during post loss of coolant accident (LOCA) long term cooling. Specific ECCS preoperational tests in PWRs are provided in Regulatory Guide (RG) 1.79 (see footnote 7). Specific ECCS preoperational and startup tests in BWRs are provided in RG 1.79.1 (see footnote 8). 2. Automatic Depressurization System (ADS). Testing should include such factors as accumulator capacity, relief valve capacity, and operability using all alternative power and pneumatic supplies. This preoperational test demonstrates proper operation of circuitry connections, ADS instrumentation and control logic functions and safety system logic functions, including integrated automatic decision making and trip logic functions associated with safety actions of ADS relief and pyrotechnic-actuated valves. The operational readiness of each pyrotechnic-actuated valve will be verified by initiating the actuator control circuitry to demonstrate acceptable electrical parameters with the charge removed from the valve. A sample of the pyrotechnic charges from the valve population will be fired in a test fixture to demonstrate their design-basis capability. The pyrotechnic-actuated valves will receive external and internal examinations for structural integrity and presence of foreign material and fluids. ADS initiation is provided to reduce pressure during LOCAs when high pressure injection systems are unable to restore reactor vessel water level. This allows