Document: NUREG-0800
Document ID: ea7ce8f5-32bf-4d8c-a653-e964bff0ef48
Document Type: srp
Title: EMERGENCY CORE COOLING SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070448.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.3
CFR Part: 
CFR Title: 

Content:
that the specified 106 operating parameters (minimum poison concentrations, minimum coolant reserve in storage, etc.) are within the bounds of the analyzed conditions. c. Verify that the frequency and scope of periodic surveillance testing is adequate. 24. The reviewer verifies that the emergency core cooling systems are designed to allow for comprehensive periodic inservice inspection, pressure and functional testing as indicated below:107 a. The reviewer confirms that the design provides the capability for periodically demonstrating that the system will operate properly when an accident signal is received. That is, it should be demonstrated by an applicant that pumps and valves operate on normal and emergency power and that water pressure and flow are as designed when the plant is operating (periodic system surveillance). When the plant is shut down for refueling, the system should be tested for delivery of 6.3-17 DRAFT Rev. 3 - April 1996 coolant to the vessel. The ECCS design should have provisions to permit appropriate periodic inspection of important components and pressure testing.108 b. For new applications, the reviewer verifies that the ECCS piping design incorporates provisions to allow for full flow testing (maximum design flow) of pumps and check valves. For those designs where it is not practical to conduct the inservice pump testing at design flow and pressure, full flow testing at maximum design flow with analysis to extrapolate to design pressure is sufficient (References 21 through 24). c. For new applications, the reviewer verifies that the ECCS design incorporates provisions to allow for testing of ECCS system motor-operated valves under design-basis differential pressure (References 21 through 24). d. For new applications, when it is not practicable to achieve design basis differential pressure during ECCS valve testing, a qualification test (under design-basis differential pressure) prior to installation and inservice valve tests conducted