Assessment of RELAP5/MOD2 Against a Load Rejection From 100% to 50% Power in the Vandellos II Nuclear Power Plant (NUREG/IA-0107, ICSP–V2–R50–R)

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Publication Information

Date Published: June 1993

Prepared by:
C. Llopis/A. N. V.
R. Mendizabal, J. Perez/C. S. N.

Asociacion Nuclear de Vandellós (A. N. V.)
Travesera de les Corts
39–43, 08020 Madrid, Spain

Consejo de Seguridad Nuclear (C.S.N.)
Justo Dorado
11–28040 Madrid, Spain

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
under the International Thermal-Hydraulic Code Assessment
and Application Program (ICAP)

Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

Availability Notice


An assessment of RELAP5/MOD2 cycle 36.04 against a load rejection from 100% to 50% power in Vandellós II NPP (Spain) is presented. The work is inscribed in the framework of the spanish contribution to ICAP Project.

The model used in the simulation consists of a single loop, a steam generator and a steam line up to the steam header all of them enlarged on a scale of 3:1; and full-scaled reactor vessel and pressurizer.

The results of the calculations have been in reasonable agreement with plant measurements.

All major trends and phenomena are correctly reproduced. The discrepancies between calculated nuclear power and plant data are likely due to wrong values of the Doppler coefficient, and in less degree to rod worth uncertainty.

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