Document: NUREG-0800
Document ID: 04c894f5-e3ab-479e-8bca-0722777c79a7
Document Type: srp
Title: Revision 4 – January 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1502/ML15027A401.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11
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CFR Title: 

Content:
quirements of 10 CFR 20.1406, “Minimization of Contamination.” Compliance with the requirements of 10 CFR 20.1406, addressing the minimization of contamination of plant facilities and avoidance of unmonitored and uncontrolled releases of radioactive materials, is addressed separately in SRP Sections 11.2 and 12.3 -12.4, “Radiation Protection Design Features.” Additional NRC guidance is presented in RG 1.143, RG 4.21, “Minimization of Contamination and Radioactive Waste Generation: Life Cycle Planning,” and Interim Staff Guidance (ISG) DC/COL-ISG-06, “Evaluation and Acceptance Criteria for 10 CFR 20.1406 to Support Design Certification and Combined License Applications.” Industry guidance is contained in American National Standards Institute/American Nuclear Society (ANSI/ANS) 2007 and Nuclear Energy Institute (NEI) 08-08A, “Generic FSAR Template Guidance for Life Cycle Minimization of Contamination,” issued September 2009, in considering the incorporation of specific design features. The LWMS design features and characteristics differ among plants, but the most important common characteristic among plants is that designs incorporate the guidance in RG 1.143. As a result, a gross failure of the LWMS is considered highly unlikely (e.g., such as a failure involving the near total loss of the system’s inventory of radioactive materials). However, the malfunction of a tank and its components, a valve misalignment, tank overflow, or an operator error appear more likely and are assumed to be the types of failures warranting an evaluation of their consequences. Although this Branch Technical Position (BTP) does not designate any specific type of system failure as being representative, the guidance considers that for the evaluation of such systems, the type of malfunctions analyzed should be limited to the postulated failure or rupture of a tank and components located outside of containment or outdoors. The evaluation considers the impact of the failure