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
CFR Part: 
CFR Title: 

Content:
components typically are waste collection tanks or sample tanks, among others. However, the components selected for the analysis should reflect the specific design features of the plant, as described in COL applications (e.g., FSAR Sections 5, 9, 10, 11, and 12). The purpose of this review is to ensure that the analysis considers the proper selection of assumed failed equipment, appropriate release mechanisms from the selected equipment and buildings and structures housing such systems, and determine whether the proposed design is BTP 11-6-7 Revision 4 – January 2016 capable of retaining the liquid inventory of the failed tank and components and includes provisions to pump the spilled inventory back to proper processing systems with sufficient holding capacity. If an analysis takes credit for liquid retention design features, the applicant must provide information that demonstrates that such features are durable and passive and that the receiving system has the storage capacity to hold the expected volume of liquid wastes. Mitigating design features that rely primarily on operator actions for their effectiveness are not acceptable. Similarly, credit may not be taken for nuclear grade coatings and joint sealants applied to concrete floor and wall surfaces in rooms where tanks and components are located, or for leakage barriers outside of building foundations since such materials are not durable as they require repeated applications. Applicants may use empirical evidence, operating experience, and modeling results to assess and confirm the efficacy of specific design features in retaining releases or retarding the movement of radioactivity once in the environment. In addition, applicants can review and apply the guidance of RG 1.143 and RG 4.21 and in industry standards ANSI/ANS 2007 and NEI 08-08A in considering the incorporation of specific design features. Based on this information, the staff will determine if the analysis can take credit for the proposed design