Document: NUREG-0800
Document ID: 846ded8e-04ea-4031-8f64-62690ca967b6
Document Type: srp
Title: ANTICIPATED TRANSIENTS WITHOUT SCRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070570008.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.8
CFR Part: 
CFR Title: 

Content:
atures affecting ATWS risk are proposed, and items of special safety significance are involved. The evaluation may be based upon referenced approved designs, analyses, and/or assessments as applied to the licensee’s plant. The categories of referenced approved materials include topical reports, standard design approvals, regulatory analyses associated with the ATWS rulemaking, and designs of systems that the staff has previously reviewed and approved. If any aspect of a design is not identical to that referenced, an evaluation must address the differences, and the safety evaluation report (FSER) should include the conclusions regarding such differences. 1. The reviewer will verify that the applicable required equipment and systems detailed in Subsection II are provided, as follows: A. The reviewer will verify, using the methods described in SRP Sections 4.3 and 9.3.5, that the specified SLCS reactivity control capability is provided for BWRs, this control capability is adequate for limiting ATWS events, and the proposed injection location is designed for the reliable performance of system functions. i. The reviewer will verify that the capacity of the SLCS has been sized according to the equivalency criterion specified in Section II.1.C above. If the review involves a power-density increase, the applicant has two options: 15.8-8 Revision 2 - March 2007 (1) The applicant can size the SLCS so that the integrated heat to containment remains constant. For example, if the power density is increased by 10 percent, the boron injection time must be reduced by 10 percent so the integrated heat load remains constant. (2) Alternatively, the applicant can demonstrate by analysis that the ATWS success criteria are satisfied under the new power density. ii. The reviewer will verify that the SLCS is capable of injecting at the elevated reactor pressure during ATWS events without lifting the SLCS relief valve. The licensee must demonstrate a sufficient margin in the SLCS relief