Implementation of the Control Rod Movement Option by means of Control Variables in RELAP5/PARCS v2.7 Coupled Code (NUREG/IA-0402)

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Publication Information

Manuscript Completed: July 2013
Date Published: July 2014

Prepared by:
R. Miró¹, P. Ana¹, T. Barrachina¹, J. C. Martínez-Murillo², C. Pereira³, G. Verdú

¹Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM)
Universitat Politècnica de València
Camí de Vera, s/n
46022 Valencia, SPAIN

²Almaraz-Trillo AIE
Av Manoteras 46Bis
28050 Madrid, SPAIN

³Departamento de Engenharia Nuclear
Unversidade Federal de Mina Gerais
Av. Antonio Carlos, 6627
31270-901 Belo Horizonte, BRAZIL

K. Tien, NRC Project Manager

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
Under the Thermal-Hydraulic Code Applications and Maintenance Program (CAMP)

Published by:
Division of Systems Analysis
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

The objective of this work is to introduce an improvement in best estimate coupled neutronic thermalhydraulic 3D codes simulations, by adding a model for the control rod movement in the coupled code RELAP5/PARCS v2.7, by means of control variables, with the aim of being able to dynamically analyze asymmetric transient accidents, as the reactivity insertion accidents (RIA) in a nuclear reactor, reproducing all the reactors control systems.

The modification developed in this work permits the automatic movement of the control rods, activated by the RELAP5 code control system, and also they can depend on signals related to the reactor reactivity, like pressure, fuel temperature or moderator temperature, etc., improving the realism of the calculation and increasing the simulation capabilities.

This report was prepared by the Nuclear Engineering Group belonging to the Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM) at the Universitat Politècnica de València (UPV), which collaborates in the simulation area with the Spanish company Centrales Nucleares Almaraz-Trillo (CNAT). The Asociación Española de la Industria Eléctrica (UNESA, Electric Industry Association of Spain), equivalent to the American EPRI sponsored this work.