Document: NUREG-0800
Document ID: e3249d77-0411-430a-9793-06aea8669075
Document Type: srp
Title: FISSION PRODUCT CONTROL SYSTEMS AND STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070474.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.5.3
CFR Part: 
CFR Title: 

Content:
or 12 postaccident ventilation. Each of the foregoing containment design and operational characteristics will influence the quantity of radioactive fission products available for release during normal operation and as a consequence of accidents.13 2. The dose mitigating function of the pressure suppression devices, e.g., subatmospheric operation, suppression pools, or containment heat removal,14 is described in Sections 6.2.1, 6.2.1.1.A, 6.2.1.1.B, 6.2.1.1.C, and 6.2.2 of the 15 SAR. The existence and operationperformance of pressure suppression devices should be determined since their existence and performance could affect fission product 16 transport and release, as well as containment pressure and containment leakage rate. 2B. Secondary Containment Design17 1. Containment type, e.g., metal siding, reinforced concrete (see SAR Section 3.8.4). The type of secondary containment structure may affect the potential for exfiltration and the probable leak tightness of the secondary containment. 2. Physical layout, e.g., volume completely surrounding primary containment, auxiliary building regions treated, main steam tunnel treated (boiling water reactors, BWRs), main steam line leakage control system provided (BWRs), 18 drawings or plan views defining secondary containment boundary, clarification of which regions are treated by cleanup systems (see SAR Sections 6.2.3, 6.5.3, and 9.39.4 ). 19 Knowledge of what regions are treated as part of the secondary containment is essential to establish the mathematical model for dose calculations. 3. Fission product removal or holdup system design, e.g., regions treated by each system, piping and instrumentation drawings of each system and its operation, fan flow rates, recirculation rate, filter locations and efficiencies, system redundancy, actuation signals, time to reduce region pressures below atmospheric, placement of ducting (see SAR Sections 6.2.3, 6.5.1, and 6.5.3). The reviewer is responsible for determining that each