Document: NUREG-0800
Document ID: a7fafe76-5570-446b-96dd-3e53ec9bccb3
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340663.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4
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Content:
actor within design power distribution limits. f. Measurements in previous reactors and critical experiments and their use in the uncertainty analyses, and measurements to be made on the reactor under review, including startup confirmatory tests and periodically required measurements. g. The translation of design limits, uncertainties, operating limits, instrument requirements, and setpoints into technical specifications. 3. The areas concerning reactivity coefficients. These are: a. The applicant's presentation of calculated nominal values for the reactivity coefficients such as the moderator coefficient, which involves primarily effects from density changes and takes the form of temperature, void, or density coefficients; the Doppler coefficient; and power coefficients. 'The range of reactor states to be covered includes the entire operating range from cold shutdown through full power, and the extremes reached in transient and accident analyses. It includes the extremes of time in cycle and an appropriate range of control rod insertions for the reactor states. b. The applicant's presentation of uncertainty analyses for nominal values, including the magnitude of the uncertainty and the justifi- cation of the magnitude by examination of the accuracy of the methods used in calculations (SAR Section 4.3.3), and comparison where possible with reactor experiments. c. The applicant's combination of nominal values and uncertainties to provide suitably conservative values for use in reactor steady-state analysis (primarily control requirements, SAR Section 4.3.2.4), stability analyses (SAR Section 4.3.2.8), and the transient and accident analyses presented in SAR Chapter 15. 4. The areas concerning reactivity control requirements and control provisions. These are: a. The control requirements and provisions for control necessary to compensate for long-term reactivity changes of the core. These reac- tivity changes occur because of depletion of the fissile material in the