Document: NUREG-0800
Document ID: a2d035da-992b-42e8-894f-787a019b437d
Document Type: srp
Title: NUCLEAR DESIGN
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070410.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4.3
CFR Part: 
CFR Title: 

Content:
able. d. The reviewer confirms the appropriateness of control rod worths used in the reactivity accident analyses reviewed under SRP Sections 15.4.8 and 15.4.9. Regulatory Guide 1.77 provides guidance for calculating maximum rod worths to be used in evaluating control rod ejection accidents for PWRs.26 6. The information presented on criticality of fuel assemblies is reviewed in the context of the applicant's physics calculations and the ability to calculate criticality of a small number of fuel assemblies. This information is related to information on fuel storage presented in SAR Section 9.1 and reviewed under SRP Sections 9.1.1 and 9.1.2. The reviewer of SRP Section 9.1 assumes that the applicant's criticality calculations have been reviewed by CPBSRXB and are acceptable. 27 7. The reviewer exercises professional judgment and experience to ascertain the following about the applicant's analytical methods: a. The computer codes used in the nuclear design are described in sufficient detail to enable the reviewer to establish that the theoretical bases, assumptions, and numerical approximations for a given code reflect the current state of the art. b. The source of the neutron cross-sections used in fast and thermal spectrum calculations is described in sufficient detail so that the reviewer can confirm that the cross-sections are comparable to those in the current ENDF/B data files (Reference. 413) . If modifications and normalization of the cross-section data 28 have been made, the bases used must be determined to be acceptable. c. The procedures used to generate problem-dependent cross-section sets are given in sufficient detail so that the reviewer can establish that they reflect the state of the art. The reviewer confirms that the methods used for the following calculations are of acceptable accuracy: the fast neutron spectrum calculation; the computation of the U-238 resonance integral and correlation with experimental data; the computation of resonance