Document: NUREG-0800
Document ID: d4441736-a9bb-45c2-8d16-d23e8312ab08
Document Type: srp
Title: CHEMICAL AND VOLUME CONTROL SYSTEM MALFUNCTION THAT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070717.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.6
CFR Part: 
CFR Title: 

Content:
els is reviewed. The RSBSRXB reviewer compares the predicted 37 variations of system parameters with various trip and system initiation setpoints. The ICSBHICB reviewer evaluates automatic initiation, actuation delays, possible bypass modes, 38 interlocks, and the feasibility of manual operation where the SAR states that operator action is needed or expected. DRAFT Rev. 2 - April 1996 15.4.6-8 To the extent deemed necessary, the RSBSRXB reviewer evaluates the effects of single active 39 failures of systems and components that may affect the course of the transient. This phase of 40 the review uses the system review procedures described in the standard review plans for Chapters 5, 6, 7, 8, and 9 of the SAR. In particular, the redundancy of alarms that alert the operator to the unplanned dilution is confirmed. The mathematical models used by the applicant to evaluate core performance and reactivity status are reviewed by RSBSRXB to determine if these models have been previously found 41 acceptable by the staff. If not, a generic review of the model proposed by the applicant is initiated. The values of system parameters and initial core and system conditions used as input to the model are reviewed by RSBSRXB . Of particular importance are the reactivity coefficients and 42 control rod worths used by the applicant. The justification provided by the applicant to show that the selected core burnup condition, boron concentration, and rod worths yield the minimum margins is evaluated. CPS is consulted regarding SRXB reviews the values of the reactivity parameters used in the applicant's analysis. These values are reviewed by CPB under SRP Section 4.2. The value of core reactivity as a function of time following each incident analyzed is confirmed by comparison with an acceptable analysis performed for another plant, by comparison with staff calculations for typical plants done by CPB on request, or by independent calculations by the RSBSRXB reviewer. 43 44 The assumed