Procedure of recovery of pin-by-pin fields of energy release in the core of VVER-type reactor for the BIPR-8 code
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edure of Recovery of PinbyPin Fields of Energy Release in the Core of VVERType Reactor for the BIPR8 Code P. V. Gordienko*, A. V. Kotsarev, and M. P. Lizorkin National Research Center Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182 Russia *email: [email protected] Received April 4, 2012
Abstract—The procedure of recovery of pinbypin energyrelease fields for the BIPR8 code and the algo rithm of the BIPR8 code which is used in nodal computation of the reactor core and on which the recovery of pinbypin fields of energy release is based are briefly described. The description and results of the verifi cation using the module of recovery of pinbypin energyrelease fields and the TVSM program are given. Keywords: pinbypin field of energy release, procedure of field recovery, constant support, trial functions, asymptotic and transient solution modes, verification. DOI: 10.1134/S1063778814130055
INTRODUCTION The aim of recovering the energyrelease fields is to ensure the possibility of checking the design limita tions in steadystate calculations and to take into account the energyrelease field deformation in the transient process calculation according to the 3D kinetics model. This will allow the additional conser vatism connected with the nodal calculation of energy release to be discarded in reactivityinduced accident calculations. It is planned to apply the obtained field description to the thermomechanical calculation of a fuel assembly in transient processes. By using the energyrelease field recovery, it is pro posed to obtain the energy releases for the full core by means of the BIPR8 code [1]. To verify the applied procedure and the new module of the BIPR8 code, the first checking calculation was carried out in which the pinbypin energyrelease fields obtained using the TVSM and BIPR8 codes for the same cassette were compared. Further, it is planned to perform more complicated verifications including fullcore calcula tions. 1. PROPERTIES OF THE BIPR8 CODE ALGORITHM ALLOWING THE STATEMENT OF A PROBLEM ON PINBYPIN ENERGY RELEASE RECOVERY The BIPR8 code performs steadystate and tran sient nodal calculations of the VVERtype reactor core. The nodal method involves introducing the notion on the solution behavior inside a node. For homogeneous nodes, this solution is an analytical solution to the diffusion equation with accuracy to the number of expansion functions.
For homogenized nodes, this solution yields a macroscopic behavior of the field over the node, on which the distribution of local energy releases can be superimposed taking into account the enrichment profiling and the presence of gadoliniumcontaining fuel rods, pipes, and other heterogeneities. The main task is to implement this superimposition and to ana lyze and substantiate the accuracy of the obtained pin bypin distribution. The calculation is conducted in two energy groups. The reactor core is divided into hexagonal nodes whose dimensions in the radial direction coincide with the fuel cassette dimens
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