The first source is based on the previous work done by Idaho National Laboratory by modifying MELCOR to include liquid lithium equation of state as a working fluid to model the nuclear fusion safety research. In the past year, the implementation included two separate sodium properties from two different sources. This report describes the preliminary implementation of the sodium thermophysical properties and the design documentation for the sodium models of CONTAIN-LMR to be implemented into MELCOR 2.1. Thus reporting for the implementation of the sodium chemistry is discussed in this report. For aid in the future implementation of sodium models, a new sodium chemistry package was created. This change led to delays of the actual implementation. Because of massive development in the main stream MELCOR 2.1 code and the require ment to merge the latest code version into this branch, the integration of the s odium models were re-directed to implement the sodium chemistry models first. In terms of implementing the sodium m odels into MELCOR, a separate sodium model branch was created for this document. For testing, CONTAIN decks have been developed for verification and validation use. This implementation should be completed in the coming year, while sodi um models from C ONTAIN-LMR are being integrated into MELCOR. Although CONTAIN 2, which represents the latest development of CONTAIN, now contains ma ny of the sodium specific models, this work is not complete due to challenges from the lower cell architecture in CONTAIN 2, which is different from CONTAIN- LMR. Therefore, CONTAIN 2 is being updated with the sodium models in CONTAIN-LMR in or der to facilitate verification of these models with the MELCOR code. Many physical models that were developed sin ce this early version of CONTAIN are not captured by this early code version. In addition, the CONTAIN-LMR code was derived from an early version of C ONTAIN code. Testing and results from this implementation of sodium pr operties are given. The second source uses properties generated more » for the SIMMER code. The first source is based on the previous work done by Idaho National Laborat ory by modifying MELCOR to include liquid lithium equation of state as a working fluid to mode l the nuclear fusion safety research. In the past two years, the implementation included the addition of sodium equations of state and sodium properties from two different sources. It also describes the progress to implement these models into CONT AIN 2 as well. This report describes the progress of the CONTAIN-LMR sodium physics and chemistry models to be implemented in to MELCOR 2.1. Also, we will report on the planned completion of all remaining tasks in the upcoming FY2017, including the atmospheric chemistry model and sodium - concrete interaction model implementation. This report will discuss the accomplishments and issues relating to the implementation. At the current stage, the newly implemented sodium chemistry models will be a part of the main MELCOR release version (MELCOR 2.2). We are no longer working on the separate branch from the main branch of MELCOR 2.1 since the major modeling of MELCOR 2.1 has been completed. An alternative method is under investigation to overcome this gap. Because MELCOR only models the equation of state for liquid and gas phases of the coolant, a modeling gap still exists when dealing with experiments or accident conditions that take place when the ambient temperature is below the freezing point of sodium. Both the spray fire and pool fire chemistry routines from CONTAIN - LMR have been integrated more » into MELCOR 2.1, and debugging and testing are in progress. Therefore, CONTAIN 2 has been updated with the sodium models in CONTAIN - LMR as CONTAIN2 - LMR, which may be used to provide code-to-code comparison with CONTAIN - LMR and MELCOR when the sodium chemistry models from CONTAIN - LMR have been completed. In addition, the CONTAIN - LMR code was derived from an early version of the CONTAIN code, and many physical models that were developed since this early version of CONTAIN are not available in this early code version. The implemented modeling has been tested and results are reported in this document. The second source uses properties generated for the SIMMER code. In the past three years, the implementation included the addition of sodium equations of state and sodium properties from two different sources. This report describes the progress of the CONTAIN - LMR sodium physics and chemistry models to be implemented in MELCOR 2.1.
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