한국전력기술

The Contractor shall provide the following consulting services.

1. Preparation of technical report and Licensing Support for RAI response:



a. A general deion of the GOTHIC heat and mass transfer models for drops. References to the GOTHIC documentation will be included for portions of the GOTHIC model that may be proprietary to EPRI.

b. A deion of the existing validation of the GOTHIC drop heat and mass transfer models including results from:



i. Drop Evaporation Test, JJ Spillman, “Evaporation from Freely Falling Droplets”, Aeronautical J. 1200:5, pp.181-185, 1984.



ii. WALE Aerosol Test, RJ Fluke, GL Ogram, LN Rogers and KR Weaver, “Aerosol Behavior in the Water Aerosol Leakage Experiments,” Proceedings of the 2nd International Conference on Containment Design & Operation, Toronto, October 14-17, 1990.



iii. Ranch Seco Spray Efficiency Tests, Schrock, V.E., et al., “Performance of a Spray Pond for Nuclear Power Plant Ultimate Heat Sink,” ASME 75-WA/HT-41, American Society of Mechanical Engineers, New York, NY, 1975.

c. Additional validation against the Sarnet-2 Benchmark, J. Malet, et al, “Spray Model Validation for Single Drop Heat and Mass Transfer for Containment Applications”, 14 International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-14, Toronto, Ontario, Canada, September 2011.

d. The validation listed above relies on subdivided GOTHIC models to track the drop heat and mass transfer as they fall through a gas/steam mixture. However, the KEPCO E&C GOTHIC containment methodology uses a lumped parameter approach. A series of GOTHIC runs will be completed that compares lumped and subdivided modeling results for drop performance for the range of conditions expected under a DBA. The lumped parameter methodology will be adjusted to assure conservative drop performance relative to the subdivided model results.

e. The effective efficiency for the containment spray system will be reported for the range of conditions expected during a DBA.

f. Prepare a response to the US NRC Request for Additional Information. It includes responses to follow-on questions to the RAI response to USNRC. Up to 40 hours of staff time will be available to address questions from the NRC.

2. Other Supports

Visit by two or three KEPCO engineers, at KEPCO E&C expense, to the contractor’s offices to discuss the draft Report for the analysis model. Visit duration is approximately five  working days.