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:
n to the hot standby condition. e. The reviewer determines that each of the independent reactivity control systems is capable of controlling the reactivity changes resulting from planned, normal power operation. This determination is made by comparing the rate of reactivity change resulting from planned, normal operation to the capabilities of each of the two control systems. Sufficient margin must exist to allow for the uncertainties in the rate. 5. The review procedures in the area of control rod patterns and reactivity worths are: a. The reviewer determines by inspection and study of the information described in subsection I.5 of this SRP section that the control rod and bank worths are 4.3-13 DRAFT Rev. 3 - April 1996 reasonable. This determination involves evaluation of the appropriateness of the analytical models used, the applicability of experimental data used to validate the models, and the applicability of generic positions or those established in previous reviews of similar reactors. b. The reviewer determines the equipment, operating restrictions, and administrative procedures that are required to restrict possible control rod and bank worths, and the extent to which the alarm criterion in subsection II.3.b of this SRP section is satisfied. If the equipment involved is subject to frequent downtime, the reviewer must determine if alternative measures should be provided or the extent of proposed outage time is acceptable. c. The reviewer will employ the same procedures as in item 5.a, above, to evaluate the scram reactivity information described in subsection I.5 of this SRP section. The scram reactivity is a property of the reactor design and is not easily changed, but if restrictions are necessary the procedures in item 5.b, above, can be followed as applicable. 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