Document: NUREG-0800
Document ID: c23d52ec-d83f-4468-b35e-e8c97fdf2f09
Document Type: srp
Title: CONTAINMENT ISOLATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070461.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.4
CFR Part: 
CFR Title: 

Content:
this SRP section. The MEBEMEB and SEBECGB have review responsibility for the structural design of the 93 94 containment internal structures and piping systems, including restraints, to ensure that the containment isolation provisions are adequately protected against missiles, pipe whip, and DRAFT Rev. 3 - April 1996 6.2.4-16 earthquakes. The CSBSCSB determines that for all containment isolation provisions, missile 95 protection and protection against loss of function from pipe whip and earthquakes were design considerations. The CSBSCSB reviews the system drawings (which should show the locations 96 of missile barriers relative to the containment isolation provisions) to determine that the isolation provisions are protected from missiles. The CSBSCSB also reviews the design criteria applied 97 to the containment isolation provisions to determine that protection against dynamic effects, such as pipe whip and earthquakes, was considered in the design. The CSBSCSB will request the 98 MEBEMEB to review the design adequacy of piping and valves for which conservative design 99 is assumed to preclude possible breach of system integrity in lieu of providing a leak-tight housing. Systems having a postaccident safety function (essential systems), as defined in Regulatory Guide 1.141) may have remote-manual isolation valves in the lines penetrating the 100 containment. The CSBSCSB reviews the provisions made to detect leakage from these lines 101 outside containment and to allow the operator in the main control room to isolate the system train should leakage occur. Leakage detection provisions may include instrumentation for measuring system flow rates, or the pressure, temperature, radiation, or water level in areas outside the containment such as valve rooms or engineered safeguards areas. The CSBSCSB102 bases its acceptance of the leakage detection provisions described in the SAR on the capability to detect leakage and identify the lines that should be isolated. The CSBSCSB