Document: NUREG-0800
Document ID: 5b0d8000-eb22-442c-a759-c14fed5c9c67
Document Type: srp
Title: EQUIPMENT AND FLOOR DRAINAGE SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070535.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.3
CFR Part: 
CFR Title: 

Content:
: 36 a. If the system is capable of detecting leaks in safety systems that utilize the drainage system sumps, and is the only means for such leakage detection, it is considered safety-related in this regard. b. If the system can cause the inundation of safety-related areas due to drain backflow that may result from malfunction of active components, blockage or the probable maximum flood, it is considered safety-related in this area. c. If the system is connected so that an inadvertent transfer of contaminated fluids to non-contaminated drainage systems can occur, it is considered safety-related in this area. d. If a failure or malfunction in a portion of the system could result in adverse effects on essential systems or componentsSSCs important to safety (i.e., 37 necessary for safe shutdown, accident prevention, or accident mitigation) it is considered safety-related in this area. If none of the above safety-related criteria apply, then the EFDS need not meet General Design Criterion 2. 2. General Design Criterion 4 with respect to the capability of withstanding the effects of and to be compatible with the environmental conditions (flooding) associated with normal operation, maintenance, testing, and postulated accidents (pipe break, tank ruptures). Acceptance is based on the system being designed to prevent flooding which could result in adverse effects on essential systems or componentsSSCs important to safety (i.e., necessary for safe shutdown, accident prevention, or accident mitigation). 38 3. General Design Criterion 60 as related to providing a means to control suitably the release of radioactive materials in liquid effluent, including anticipated operational occurrences. This criterion applies since the EFDS usually consists of two subsystems, radioactive and nonradioactive and the inadvertent transfer of radioactive wastes to the nonradioactive portion of the system could result in radioactive releases to the environs. Acceptance is based on the system