Authors & Affiliations
Artemov V.G.1, Kuznetsov A.N.1, Kurakin K.Yu.2, Tikhomirov A.V.2
1 Alexandrov Research Institute of Technoloqy, Sosnovy Bor, Russia 2 Experimental and Design Organization "GIDROPRESS", Podolsk, Russia
Artemov V.G. – Head of laboratory, Cand. Sci. (Techn.), Alexandrov Research In-stitute of Technoloqy.
Kurakin K.Yu. – Head of Department, Experimental and Design Organiza-tion "GIDROPRESS".
Tikhomirov A.V. – Leading design engineer, Experimental and Design Organiza-tion "GIDROPRESS".
This paper presents the verification results of SAPFIR_95&RC_micro program that is intended for fine-grid three-dimensional pin-by-pin calculation of power in VVER reactor core at change of coolant density. In this paper, fine-grid three-dimensional pin-by-pin power calculation is typically seen as calculation where pin-by-pin power is computed on the finite-difference grid that matches the fuel rod spac-ing in fuel assembly. MCNP-based calculation was used as a benchmark; this calculation was prepared for one of the first fuel loadings of the NPP-2006 reactor. A series of two-dimensional calculations has been performed: in each test the same coolant density over the reactor core (variation of water density from 0.3 to 0.8 g/cm3) is set, coolant temperature is considered as invariable and is 315 °C. Three-dimensional calculation has been performed: different density (range of 0.46—0.73 g/cm3) in ten layers along the core axis is set, coolant temperature is varying from 299 to 348 °C. The influence of number of energy groups on the accuracy of power calculation for fuel rods and gadolinium fuel rods is analyzed. Two-, six- and twelve-group diffusion approximation are calculated. The calculation model is prepared using SAPFIR_95.1 cell calculation program and SAPFIR_95&RC_micro pin-by-pin power calculation program.
reactor calculation, pin-by-pin energy release, “fine-grid” computation
1. SAPFIR_95&RC_VVER. Certification passport of software no. 321 of 04.18.2013. Moscow, Ros-tekhnadzor Publ., 2013.
2. SAPFIR_95.1. Certification passport of the software no. 390 of 12.16.2015. Moscow, Rostekhnadzor Publ., 2015.
3. Artemov V.G., Artemova L.M., Kuznetsov A.N., Mikheev P.A. Programmnye sredstva dlya podgotovki raschetnykh modeley i analiza poluchennykh rezul'tatov raschetov potvel'nogo energovydeleniya v kom-plekse programm SAPFIR_95&RC_VVER [Software for the preparation of computational models and analysis of the obtained results of calculations of the fuel energy release in the complex programs SAP-PHIR_95&RC_VVER]. Trudy 10 mezhdunarodnoy nauchno-tekhnicheskaya konferentsii “Obespeche-nie bezopasnosti AES s VVER” [Proc. 10th Int. Sci. and Techn. Conf. "Ensuring the safety of nuclear power plants with VVER"]. Podolsk, 2017. Available at: http://www.gidropress.podolsk.ru/ files/proceedings/mntk2017/documents/mntk2017-092.pdf (accessed 12.10.2018).