Document: NUREG-0800
Document ID: eb117be6-f688-40f6-97a8-c91b8e9f8e74
Document Type: srp
Title: CONTAINMENT HEAT REMOVAL SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070457.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.2
CFR Part: 
CFR Title: 

Content:
of fan coolers are reviewed for acceptability. c. If the secondary side of a fan cooler heat exchanger is not a closed system, the CSBSCSB reviews the potential for surface fouling. The CSBSCSB 80 81 determines whether or not surface fouling impairs the heat removal capability of a fan cooler. DRAFT Rev. 5 - April 1996 6.2.2-10 11. CSBThe SCSB reviews the system provided to allow drainage of containment spray 82 water and emergency core cooling water to the recirculation suction points (sumps). a. CSBThe SCSB reviews the design of the protective screen assemblies around 83 the suction points. i. CSBThe SCSB reviews plan and elevation drawings of the protective 84 screen assemblies, showing the relative positions and orientations of the trash bars or grating and the stages of screening, to determine that the potential for debris clogging the screening is minimized. ii. CSBThe SCSB also reviews the drawings to determine that suction 85 points do not share the same screened enclosure. The effectiveness of the protective screen assembly will be determined by comparing the smallest mesh size of screening provided to the clogging potential of pumps, heat exchangers, valves, and spray nozzles. iii. The methods of attachment of the trash bars or grating and the screening to the protective screen assembly structure should be discussed in the SAR and shown on drawings. iv. A discussion of the adequacy of the surface area of screening with respect to assuringensuring a low velocity of approach of the water to minimize 86 the potential for debris in the water being sucked against the screening should be presented. v. For new applicants the size of the suction inlet screen area (PWR) and suction strainers (BWR) should have a factor of three sizing margin over that specified in Regulatory Guide 1.82.87 b. Regulatory Guide 1.82, Rev. 1 (Ref. 5) provides guidelines for the 88 89 acceptability of the design of PWR sumps and BWR RHR suction inlets. NUREG-0897, Rev. 1, (Ref.