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:
iven in subsection II. SRP Section 14.3 (proposed) contains procedures for the review of certified design material (CDM) for the standard design, including the site parameters, interface criteria, and ITAAC.49 IV. EVALUATION FINDINGS 15.4.6-9 DRAFT Rev. 2 - April 1996 The reviewer verifies that the SAR contains sufficient information and histhe review supports 50 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 malfunctions 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 during refueling and minutes if at power. In the latter case the most severe transient results in a minimum departure from nucleate boiling ratio (DNBR) of and reactor coolant and main steam system pressures of less than 110% of 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 GDC 10 with respect to demonstrating that the specified acceptable fuel design limits are not exceeded for this event. This requirement has been met since the results of the analysis showed that the thermal margin limits (Mminimum DNBR for PWRs) are satisfied as indicated 51 by SER Section 4.4. 2. The applicant has met the requirements of GDC 15 with