Document: NUREG-0800
Document ID: 9738c583-ac33-4836-b8f1-580dc98eb7f0
Document Type: srp
Title: RADIOLOGICAL CONSEQUENCES OF THE FAILURE OF SMALL LINES CARRYING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350147.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.6.2
CFR Part: 
CFR Title: 

Content:
PRIMARY COOLANT OUTSIDE CONTAINMENT REVIEW RESPONSIBILITIES Primary - Accident Evaluation Branch (AEB) Secondary - None I. AREAS OF REVIEW This SRP section covers the radiological consequences of failures outside the containment of small lines connected to the primary coolant pressure boundary, such as instrument lines and sample lines. The review includes the following: 1. The identification of small lines postulated to fail and the isolation provisions for these lines, including the applicability of General Design Criterion 55 (Ref. 1), which requires isolation capability of the line inside and outside containment, and Regulatory Guide 1.11 (Ref. 2), which requires isolation capability outside containment for those lines that are exempt from GDC 55. The implementation of these regulatory positions and guidelines is reviewed by the Containment Systems Branch (CSB) under SRP Section 6.2.4. 2. The failure scenario, as described by the applicant, to assure that the most severe radioactive releases have been considered. 3. The models ad assumptions used by the applicant for the calculation of the thyroid and whole-body doses for the postulated failure. 4. An evaluation of the primary coolant iodine activity, including the effects of a concurrent iodine spike, and the technical specifications for the reactor coolant iodine activity. 5. An independent calculation by the staff of the thyroid and whole-body doses for the small line failure, including an evaluation of the isolation times and maximum leak rates of the isolation valves. Rev. 2 - July 1981 USNRC STANDARD REVIEW PLAN Standard review plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for the review of applications to construct and operate nuclear power plants. These documents are made available to the public as part of the Commission's policy to Inform the nuclear Industry and the general public of regulatory procedures and policies. Standard review plans are not