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
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CFR Title: 

Content:
fy 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 valve setpoint. B. The reviewer will verify that the applicable required instrumentation-related equipment and systems are provided, including ARI, automatic recirculation pump trips, and automatic SLCS initiation for BWRs, automatic auxiliary feedwater and turbine trip initiation for PWRs and diverse scram systems for specified PWR designs. C. The reviewer will confirm that required equipment and systems are designed for independence and diversity from the reactor trip system where specified in Subsection II. Appendix A to SRP Section 7.1 and SRP Section 7.2 describe the criteria and methods for these reviews. 2. The reviewer will verify that sufficient information is provided or referenced to conclude that the required features will satisfy the criteria for acceptable plant conditions specified in Subsection II. The reviewer will place particular emphasis on the identification of plant-design differences with respect to referenced previously accepted materials. The reviewer will also perform the following in connection with this review: A. Evaluate the manner in which the applicant credits operator actions, including actions specified in applicable EPGs for the design or in EOPs or EOIs for the specific plant under review, as applicable. B. Verify that the applicant demonstrates assured capability for long-term shutdown and cooling following an ATWS event using systems identified in EPGs, EOPs, or EOIs for ATWS events. C. For PWRs, if applicable, evaluate the applicant’s assumptions regarding the moderator temperature coefficient (MTC) and determine them to be either consistent with MTC modeling assumptions serving as bases for the Rule or adequately justified. Appendix C to NUREG-0460 discusses the MTC values used by PWR vendors for ATWS analyses before