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Attached is the Experiment Prediction for LOFT Experim~nt Ll-4. This report contains the WHAM and RELAP4 ~omputer code predictions of the thermal-hydraulic response of th~ LOFT system during subcooled and saturated blowdown. We welcome your comments.

The author would like to thank T. J. Burns and M. L. Williams 01 the Engineering Physics Division for their guidance in the early phases of this work and for the many interesting and helpful discussions contributed throughout the entire study. Thanks are also due T. B. Fowler and G. W. Cunningham for their help in understanding the logic of the VENTURE/BURNER mod ular code system. In addition, this work would not have been completed were it not for the encour agement and support provided by D. E. Bartine and C. R. Weisbin of the Engineering Physics and Mathematics Division. Finally, the author is indebted to Lindy Norris for typing the many drafts of this report ix ABSTRACT This report provides the background theory, user input, and sample problems required for the effi cient application of the DEPTH-CHARGE system-a code block for both static and time-dependent perturbation theory and data sensitivity analyses. The DEPTH-CHARGE system is of modular con struction and has been implemented within the VENTURE-BURNER, computational system at Oak Ridge National Laboratory. The DEPTH module (coupled with VENTURE) solves for the three adjoint functions of Depletion Perturbation Theory and calculates the desired time-dependent deriva tives of the response with respect to the nuclide concentrations and nuclear data utilized in the reference modeL The CHARGE code is a collection of utility routines for general data manipulation and input preparation and considerably extends the usefulness of the system through the automatic generation of adjoint sources, estimated perturbed responses, and relative data sensitivity coefficients. Combined, the DEPTH-CHARGE system provides, for the first time, a complete generalized first-order perturbation/sensitivity theory capability for both statk and time-dependent analyses of realistic mul tidimensional reactor models. This current documentation incorporates minor revisions to the original DEPTH-CHARGE docu mentation (ORNL/CSD-78) to reflect some new capabilities within the individual codes. Most of the modifications, however, are transparent to the user. Changes that arc under user control are described in the updated General Input Description and deal mainly with the processing and manipulation of data sensitivity files. Finally, it should also be noted that the sample problem input files have been modified to reflect these changes and to include the job control instructions for execution from a complete BOLD VENTURE-IV program package. xi COMPUTER CODE ABSTRACT 1. Program Identification: The DEPTH-CHARGE system is a set of code modules (SUBMRG, CHARGE, and DEPTH) for generalized static and time-dependent perturbation/sensitivity calculations. 2. Function: This code system (coupled with a neutronics module) prepares the required adjoint sources, solves the adjoint equations of Depletion Perturbation Theory, and calculates static and/or time-dependent nuclide and data sensitivity coefficients for a wide variety of final-time response functional. 3. Method of Solution: The DEPTH module (...

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