**RSICC CODE PACKAGE PSR-547**

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**1. NAME AND TITLE**

SMAFS: Steady-State Analysis Model for Advanced Fuel Cycle Schemes.

**2. CONTRIBUTORS**

Nuclear Development Division, OECD Nuclear Energy Agency, Issy-les-Moulineaux, France, through the OECD NEA Data Bank.

**3. CODING LANGUAGE AND
COMPUTER**

Microsoft Excel 2000 or later; PC* *(P00547PC58600).

NEADB package identifier is NEA-1767/01.

**4. NATURE OF PROBLEM
SOLVED**

SMAFS was developed as a part of the study, "Advanced Fuel Cycles and Waste Management", which was performed during 2003-2005 by an ad-hoc expert group under the Nuclear Development Committee in the OECD/NEA. The model was designed for an efficient conduct of nuclear fuel cycle scheme cost analyses. It is simple, transparent and offers users the capability to track down cost analysis results. All the fuel cycle schemes considered in the model are represented in a graphic format and all values related to a fuel cycle step are shown in the graphic interface, i.e., there are no hidden values embedded in the calculations. All data on the fuel cycle schemes considered in the study including mass flows, waste generation, cost data, and other data such as activities, decay heat and neutron sources of spent fuel and high-level waste along time are included in the model and can be displayed. The user can easily modify values of mass flows and/or cost parameters and see corresponding changes in the results. The model calculates: front-end fuel cycle mass flows such as requirements of enrichment and conversion services and natural uranium; mass of waste based on the waste generation parameters and the mass flow; and all costs.

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**5. METHOD OF SOLUTION**

It performs Monte Carlo simulations by changing the values of all unit costs within their respective ranges (from lower to upper bounds). In Monte Carlo simulation, it is assumed that all unit costs follow a triangular probability distribution function, i.e., the probability that the unit cost has a value increases linearly from its lower bound to the nominal value and then decreases linearly to its upper bound.

**6. RESTRICTIONS OR
LIMITATIONS**

The limit for the Monte Carlo iterations is the one of an Excel worksheet, i.e. 65,536.

**7. TYPICAL RUNNING TIME**

Calculations are done immediately as usual in Microsoft Excel applications. Sensitivity analyses take some time, up to a few minutes, for copying and pasting values. Monte Carlo simulation takes time depending on the number of iterations and the speed of the PC. For 10,000 iterations, it may take more than 30 minutes, depending on the computer.

**8. COMPUTER HARDWARE
REQUIREMENTS**

SMAFS runs on Windows PCs and consumes approximately 5Mb of disk space.

9. **COMPUTER SOFTWARE
REQUIREMENTS**

Microsoft Excel 2000 or later and Acrobat Reader are required to use SMAFS.

**10. REFERENCE**

Kwang-Seok Lee, “User's Manual for SMAFS - Steady-State Analysis Model for Advanced Fuel Cycle Schemes,” NEA-1767/01 (May 2006).

**11. CONTENTS OF CODE
PACKAGE**

The package contains the reference listed above in Section 10 and is transmitted on one CD in a compressed Windows file, which contains the .xls file and documentation.

**12. DATE OF ABSTRACT**

March 2008.

**KEYWORDS:** COST ANALYSIS; ECONOMICS