Document: NUREG-0800
Document ID: 988a555f-fdfa-4452-829d-c06654bfbba5
Document Type: srp
Title: Initial Plant Test Program - Design Certification and New License Applicants
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660618.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.2
CFR Part: 
CFR Title: 

Content:
is risk significant, that component or function should be described in the DD. Any features such as flow limiters, backflow protection, surge tanks, severe accident features, etc. should be described in the DD as follows: (1) Flow limiting features for high-energy line breaks (HELBs) outside of containment - The minimum pipe diameter should be confirmed because these features are needed to directly limit/mitigate Design Basis Events such as pipe breaks. Lines less than 1 inch 14.3-25 March 2007 (e.g., instrument lines) need not included because their small size limits the effects of HELBs outside containment. (2) Keep Fill systems - These should be included in the design description when needed for the direct safety function to be achieved without the damaging effects of water hammer. (3) Online Test Features - Some systems/components have special provisions for online test capability which is critical to demonstrate its capability to perform the direct safety function. An example is an ECCS test loop. These online test features should be described in the DD. (4) Filters - Filters that are required for a safety function (such as Control room HVAC radiation filtering) should be in the design description. The basic configuration ITAAC should check that the filter exists, but need not test the filter performance. (5) Surge Tank - The capacity of the surge tank should be verified if the tank is needed to perform the direct safety function. For example, in the case of the RCW surge tank a certain volume is required to meet the specific system leakage assumptions. (6) Severe Accident Features - These features should be described in the design description, and the basic configuration ITAAC should verify that they exist. In general, the capabilities of the features need not be included in the ITAAC. Detailed analyses should be retained in Tier 2. (7) Hazard (e.g., flood, fire) Protection Features - Special features (switches, valves, dampers) used to provide protection