Drywell Debris Transport Study: Computational Work – Final Report (NUREG/CR-6369, Volume 3)

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Publication Information

Manuscript Completed: February 1998
Date Published: September 1999

Prepared by:
C. Shaffer, D. V. Rao, J. Brideau

Science and Engineering Associates, Inc.
6100 Uptown Blvd. NE
Albuquerque, NM 87110

Prepared for:
Division of Engineering Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

NRC Job Code W6325

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Abstract

This report describes various analyses conducted as part of the drywell debris transport study. The primary objective of these analyses was to identify controlling phenomena and critical data requirements. A secondary objective was to explore various options available to model debris transport in the drywell, and make judgements regarding the degree of accuracy to which each phenomenon should be modeled. These analyses decomposed the problem into several components that were amenable to resolution by well-proven analytical models. The analyses specifically addressed the following phenomena that significantly impact debris transport: pressure vessel blowdown, containment thermal-hydraulics (e.g., structural wetness, flow velocities in the drywell), debris removal by various capture mechanisms and debris transport in the water pools formed on the drywell floor. The analytical tools used in the study included RELAP, MELCOR and CFD-2000. The results of some of the analyses were used to design the experiments conducted as part of the study and during the debris transport quantification process described in NUREG/CR-6369, Vol. 1.