Document: NUREG-0800
Document ID: 8b6b2506-1305-4f5c-9cd6-725a1d90c61c
Document Type: srp
Title: CHEMICAL AND VOLUME CONTROL SYSTEM MALFUNCTION THAT RESULTS IN A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350402.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.6
CFR Part: 
CFR Title: 

Content:
en. The results of the analyses are reviewed and compared to the acceptance criteria presented in subsection II of this SRP regarding the time available for the operator to take corrective action. The variations with time during the tran- sient of important parameters are compared to those predicted for other similar plants to see that they are within the range expected. Parameters of particular 15.4.6-5 Rev. 1 - July 1981 importance are core reactivity, boron concentration, rate of addition of unbor- ated water, power level, core pressure, and minimum departure from nucleate boiling ratio (DNBR). IV. EVALUATION FINDINGS The reviewer verifies that the SAR contains sufficient information and his review supports the following kinds of statements and conclusions which should be included in the staff's safety evaluation report: Various chemical and volume control system (CVCS) malfunctions which could lead to an unplanned boron dilution incident have been reviewed. The mal- functions that allow the operator the shortest time for corrective action *have been analyzed starting from plant conditions of startup, power operation (automatic and manual), hot standby, cold shutdown, and refueling. These events were evaluated by the applicant using a mathematical model that has been previously reviewed and found to be suitably conservative. The results of the analyses of these events showed that the operator has minutes to take corrective action if a boron dilution incident occurs idring refueling and minutes if at power. In the latter case the most severe transient resuT-E in a minimum departure from nucleate boiling ratio (DNBR) of and reactor coolant and main steam system pressures of less than llO%-oT design. The staff concludes that the analysis for the decrease in reactor coolant boron concentration event is acceptable and meets the requirements of General Design Criteria 10, 15 and 26. This conclusion is based on the following: 1. The applicant has met the requirements of