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:
studied the design of BWR core spray and low pressure coolant injection systems to ensure that the systems will automatically restart on loss of water level, after having been manually stopped, if an initiation signal is still present. 120 (h) II.K.3(39) of NUREG-0660121 27. For evolutionary BWRs, the reviewer verifies that the applicant has administrative procedures in place that establish limitations on the ECCS cumulative outage times. The reviewer verifies that the applicant will prepare and submit annual reports on ECCS unavailability that also include information on: outage dates, lengths, and causes; ECCS components involved; and any corrective action taken (Reference 34).122 28. The reviewer verifies that the applicant has considered the following guidance regarding the design of the ECCS miniflow systems necessary to insure safety related ECCS pump protection: a. Insure that the minimum cooling flow provided for the ECCS pumps is adequate under all conditions, including verification that the system configuration precludes pump-to-pump interaction during miniflow operation that could result in dead-heading one or more of the pumps. The miniflow must be sufficient to prevent damage to the pump(s) under all conditions (References 28, 29 and 31). b. The miniflow system shall be designed such that the miniflow function can be performed assuming a single failure. A single failure should not result in conditions causing no flow through the ECCS pumps (Reference 30). c. In cases where only the miniflow return line is available for pump testing, flow instrumentation must be installed on the miniflow return line. This instrumentation is necessary to provide flow rate measurements during pump testing so that this data can be evaluated with the measured pump differential pressure to monitor for pump hydraulic degradation (References 27 and 31).123 29. The reviewer evaluates the ECCS capability to provide reactor coolant system inventory additions during reduced