27th CMS User’s Group Meeting Mendenhall Inn, Mendenhall, PA Nuclide Fission Rate Calculations with CMS for Taiwan Experiment on Neutrino Weng-Sheng Kuo Institute of Nuclear Energy Research Taiwan, ROC May 20 ~ 21, 2002

OUTLINE I. Taiwan Experiment on Neutrino II. Key Issues in Fission Rate Calculations III. INER’s Solution for Fission Rate Calculations IV. Conclusion

I. Taiwan EXperiment On NeutrinO (TEXONO) The TEXNONO Collaboration has been Established Since 1997 to Initiate and Pursue an Experiment Program in Neutrino and Astroparticle Physics. TEXONO Comprises More than 40 Scientists from Taiwan, Mainland China, and USA. The “Flagship” Program is a Reactor Neutrino Experiment to Study Low Energy Neutrino Properties and Interactions. The “Kuo-Sheng Neutrino Laboratory” is Located at 28 m from the Core of Unit 1 of the Kuo-Sheng NPP, Operated by Taiwan Power Company (TPC). The Reactor Neutrino Experiment is Conducted by Scientists at Academia Sinica, Taiwan. Nuclide Fission Rates are Crucial to the Generation of Neutrino Spectrum.

Kuo-Sheng Nuclear Power Plant KS NPS-II : 2 Units X 2.9 GW

TEXONO Laboratory 28 m from core of unit 1

II. Key Issues in Fission Rate Calculations Scientists at Academia Sinica have no Nuclear Background and Asked TPC to Help Them to Get the Nuclide Fission Rates, however, Fission Rates Data Are Not Directly Available from the On-Line Core Monitoring System. Modification of the On-Line Core Monitoring System is Restricted by Legal Issues and Prohibited by TPC. Fuel Vendor of Kuo-Sheng NPP Suggested TPC and Academia Sinica to Seek Assistance from INER. Academia Sinica and INER Achieved a Special Agreement and a Task-Force Team was Formed.

II. Key Issues in Fission Rate Calculations (Cont’d) Several Key Issues were Identified by the Task-Force Team: The On-Line Core Monitoring Data Need to be Converted to SIMULATE-3 Core Follow Input Decks. MANY “Fine-Step” SIMULATE-3 Core Follow Calculations were Required to “Follow” the Actual Core Operation with Much Finer Burnup Step. These Fine-Step Core Follow Calculations Need to be Done Automatically. A Special Methodology is Required to Calculate the Nuclide Fission Rates from CMS. An INER’s Solution Methodology was Developed.

III. INER’s Solution for Fission Rate Calculations On-Line Core Monitoring System (from TPC) CASMO-3 Lattice Data (including Nuclide Fission Rates) Core Operating Data FISSRATE (Nuclide Fission Rate Calculation Program) FISCOF (Fine-Step Core Follow Calculation Program) SIMULATE-3 Detailed Fine-Step Core Follow Input Decks Nodewise Nuclide Fission Rates (U-235, U-238, Pu-239, and Pu-241) SIMUALTE-3 Detailed Fine-Step Core Follow Calculations

INER’s Methodology for Calculating the Nuclide Fission Rates TABLES-Like Nested High-Order Interpolation Scheme

INER’s Methodology for Calculating the Nuclide Fission Rates (Cont’d) Nuclide Fission Rate Renormalization

IV. Conclusion INER’s Solution Methodology has Successfully Generated the Necessary Nuclide Fission Rates for TEXNONO. The Accuracy of the Fission Rates has been Validated by Academia Sinica. The FISSRATE Program Developed for TEXONO Can be Easily Tailored to Other Similar Applications.