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:
ential 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 inventory operations as follows (Reference 26): a. PWR designs and related operating procedures should have a means of providing at least two available or operable means of adding inventory to the RCS that are in addition to pumps that are a part of the normal decay heat removal systems. These means should include at least one high pressure injection pump from the ECCS. b. The water addition rate provided by each of the means should be at least sufficient to keep the core covered. 6.3-19 DRAFT Rev. 3 - April 1996 c. Procedures should be provided for use of these systems during loss of decay heat removal events. The path of water addition must be specified to assure the flow does not bypass the reactor vessel before exiting any opening in the RCS.124 30. The reviewer coordinates with EMEB and verifies that the applicant has reviewed their ECCS design configurations to identify any unisolable piping connected to the RCS that could be subjected to temperature distributions which would result in unacceptable thermal stresses. This review should consider the potential for thermal stratification, thermal cycling and thermal fatigue given the ECCS piping configurations. The reviewer verifies that appropriate action has been taken, where such piping is identified, to ensure that the piping will not be subjected to unacceptable thermal stresses (Reference 32). The SRXB review focuses on ECCS configurations; reviewing the stress analysis and ensuring the stresses are in compliance with the ASME code is the responsibility of EMEB in SRP Section 3.9.3.125 For standard design certification reviews under 10 CFR Part 52, the procedures above should be followed, as modified by the procedures in SRP Section 14.3 (proposed), to verify that the design set forth in the standard safety