Starlite Conference Call Minutes

13 August 1996

Participants: Sze, Wong, Bathke, Waganer, Cole, Jardin, Miller, Mau, Tillack, Thayer, Mogahad

Administrative

The minutes of the 10 July conference call have been approved and posted on the Starlite Home Page.

Mark Tillack published the 6th Quarterly report on the Home Page.

The collection of the Starlite ANS papers has been printed in hard copy form and distributed to the team organizations.

Drafts of the Final Report sections are to be brought to the Madison Starlite meeting.

An agenda for the meeting has been sent out to the ARIES EXEC for comments. Several suggestions have been forwarded for incorporation.

Safety and Licensing

Bob Thayer reported that he is running the safety code and generating optimistic data. His early data for the baseline LOCA indicates that a significant dose would be released barring any mitigating factor assumptions. But when the existing vessels and buildings are considered, these containment structures would slow down the release and the dose may go down by a factor of 100. He has evaluated four LOCA cases which include tenelon, vanadium replacing tenelon, a FWBS emissivity of 0.5, and an emissivity of 0.8. These four cases yield different sets of maximum temperatures for the internal components. The preliminary data was discussed, but any decision is being withheld until final data can be presented at the upcoming meeting.

Systems Studies

Bathke told the group that he had incorporated several changes and improvements in the systems code. These were incorporation of a new blanket and shield definition, a Zeff dependence, and a new current drive power dependence on Zeff and edge density. The optimization routine was not converging properly, perhaps due to the discontinous costing of the TF coils when changing from NbTi to Nb3Sn conductors. Ron Miller explained the cost impact to change from NbTi to Nb3Sn is less than had previously been thought due to elimination of ITER development costs and application of the appropriate learning curve factors.

Plasma Physics

Steve Jardin reported that agreement was reached to assume the plasma would radiate 100 MW of power including Bremsstrahlung and impurity radiation from the plasma edge. TK Mau noted that he had finished the current drive system modeling and supplied the model to C. Bathke for incorporation into the system code. He also has been refining the fuel delivery system requirements for the reverse shear plasma and defining the fueling system hardware. He had decided the baseline pellet should be 4 mm in diameter with an appropriate speed to yield the right depth of penetration and minimize the plasma density disturbance.

Engineering

ASC code results - Mark Tillack hopes that the next strawman results will be close to the 7 May design point so all analyses and point designs will be directly applicable. If the new strawman is radically different, it is hoped the analyses would not need to be redone, but the design databook will reflect the final strawman parameters. Analyses results should be scaled to the final design point. D-K Sze noted that care should be taken to make sure all parameters are considered and used.

Design Integration and Configuration Development - Dick Cole noted he is still updating his configuration based upon the 7 May model. Per the suggestion of C. Wong, Dick agreed to return the depth of the divertor slot to the shorter value, not use the extended depth option. Mark Tillack asked D. Cole and L. Waganer to investigate the translation and transmission of their CAD files. MDA can translate line drawings via IGES and we have FTPed them to the ARIES server. Shaded image CAD files need a more sophisticated translator such as STEP (IGES will not handle solids). Trial transfers of these solid-image files are planned. We also will try to generate PostScript CAD files for publication purposes.

Blanket and Shield - D-K Sze reported the divertor heat transport calculations for 1 MW/m2 are complete and will be reported at the upcoming meeting. The heat flux for the final design point may be somewhat less, depending on C. WongÌs results.

Divertor - C. Wong reported that X. Wang has been conducting analyses and reporting the results to the divertor and blanket teams. Clement has been having difficulty getting the divertor design to handle the required heat load, thus has been assuming the Zeff at the maximum value of 2.0 rather than the suggested value of 1.7. It was suggested that Clement hold to a Zeff of 1.7 and assume the core will handle 100 MW of radiated power. Clement noted Tom Petrie was trying to solve the coupled problem to find an integrated solution. Clement also noted that the divertor coolant temperature may need to be lower than desired in order to handle the required power level.

General - M. Tillack encouraged all team members to examine the project engineering conclusions as presented on the Starlite Home Page and to offer any comments.