Document: NUREG-0800
Document ID: d5a274a9-ea29-4a99-9cbe-73eefa2e90f4
Document Type: srp
Title: REACTOR CORE ISOLATION COOLING SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340631.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.6
CFR Part: 
CFR Title: 

Content:
c restart capability is provided for RCIC. 17. The reviewer checks (by calculation as necessary) to see that adequate net positive suction head is available for RCIC suction from all potential sources (i.e., condensate storage tank, suppression pool, or RHR steam condensing mode discharge). 18. The reviewer examines the RCIC in conjunction with the HPCS or HPCI, the safety/relief valves and the suppression pool cooling mode of RHR for conformance to the recommendations of BTP RSB 5-1 to SRP Section 5.4.7 regarding residual heat removal. 19. The RCIC system is reviewed to evaluate the adequacy of design features that have been provided to prevent damaging water (steam) hammer due to such mechanisms as voided discharge lines, water entrainment and steam bubble collapse. If the normal water supply is above the discharge lines, voided-lines are prevented by proper vent location and filling and venting procedures. The vents should be located for ease of operation and testing on a periodic basis. If the normal alignment of the suction valves is to a source below the highest level of the pump discharge lines (e.g., the suppression pool,) back leakage through the pump discharge check valves will result in line voiding. Proper vent location and filling and venting procedures are still needed. In addition, a special keep-full system with appropriate alarms is needed to supply water to the discharge lines at sufficiently high pressure to prevent voiding. Operating and maintenance procedures shall be reviewed by the applicant to assure that adequate measures are taken to avoid water hammer due to voided line conditions. 5.4.6-7 Rev. 3 - April 1984 The RCIC system uses a steam-driven turbine. Typical design features for the steam supply line include (a) drain pots, (b) sloped lines, and (c) limitations on opening and closing sequences and-seal-ins for manual opera- tion of the isolation valves to preclude introducing water slugs into the line. The turbine exhaust line features