ARIES Documents -- Meetings ArchiveARIES Conference Call, 23 April 2013
Documented by L. Waganer
Les Waganer reminded the Team that the next ARIES project meeting is scheduled for Tuesday, 21 May 2013 and Wednesday morning, 22 May 2013. Al Opdenaker is made arrangements for the meeting room and attendees' rooms at the Germantown Hampton Inn. Contact Les Waganer if you do not have the room information. Please make your reservations ASAP so DOE does not have to pay for rooms not reserved. Les Waganer has issued a draft agenda - contact him if you need to modify the time or the title of your talk.
Due to the proximity of the next ARIES project meeting, there will be no need for a conference call before the meeting.
Some of the drafts of the ACT-1 final report technical papers have been received, but Farrokh Najmabadi will contact those who have not submitted their drafts yet to Farrokh. Farrokh will send out a URL web link to the draft papers and titles.
ARIES Technical Efforts
System Code ACT-2 Results - Mark Tillack and Chuck Kessel have been conducting physics and engineering code scans for selecting the appropriate parameter space for ACT-2. The physics code initially generated 1.3 million points for consideration. The output results were filtered to obtain fewer and more suitable points. The general observation is that the ACT- 2 physics parameters will result in a larger machine (R = 9 to 10 m) as compared to ACT-1. However more analysis work is required to determine the best operating parameter space. The Greenwald limit seems to be a strong influence on the machine size.
Steady-State Physics Analysis - Alan Turnbull related that he has been out on medical leave and has nothing to report.
Status of GT Helium Test Facility - - Minami Yoda said GT is starting to produce experimental results with their helium test facility, and should be reporting on their initial results for the tungsten-alloy HEMJ test section at the ARIES meeting at the end of May. The helium loop is already running for hours at a time with inlet temperatures exceeding 200°C and inlet pressures of 10 MPa with negligible leakage of helium. GT plans to achieve incident heat flux levels of at least 2.5 MW/m2 with the current setup, and have not observed significant oxidation of the test section so far.
Modeling Radiating Edge Plasmas - Tom Rognlien noted they are out of budget now, but there is some indication he may be able to finish up and document their findings (on ACT-1).
Power Core Design - Xueren Wang has been updating the ACT-1 CAD drawings and placing the files on the ARIES web site. He is also working on the general configuration of the ACT-2 without the specific geometric machine parameters. He is also working on the helium cooling system plumbing layout with Christine Koehly
ACT Design Effort - Xueren Wang has been updating the ACT-1 CAD drawings and placing the files on the ARIES web site. He is also working on the general configuration of the ACT-2 without the specific geometric machine parameters. He is also working on the helium cooling system plumbing layout with Christine Koehly.
ACT Design Effort - Farrokh Najmabadi emphasized the need to quickly define the ACT-2 design point and the supporting physics database. This effort may be discussed at the May meeting.
ACT-2 Radial Build, TBR Analysis and Neutronics Assessment - - Laila El-Guebaly said UW-Madison has been running the 3-D neutronics analysis code on a notional ACT-2 configuration with the FW/Blanket thickness of 1.0 m outboard and 0.65 m inboard, primarily to estimate the ability of the larger machine to have a suitable tritium breeding ratio. All numbers are still very approximate as the size and fusion power of the machine are unknown.
Laila also reported the ACT-1 Vacuum Vessel is predicted to have a life of plant (40 FPY) lifetime, whereas the inboard Structural Ring will only need to be replaced once. Les Waganer noted that the maintenance philosophy may require two sets of the entire Structural Rings to obtain high availability, so the higher damage for the Structural Rings may be acceptable.
Laila is also parametrically analyzing the ACT-1 blanket assembly gap thicknesses to determine damage to the underlying components and possible design solutions by stepping the gap. Mark Tillack noted there is some ITER rewelding data available, but this data related to 316SS components. Laila reported on the ITER re-weldability limits (of 1 and 3 appm He for thick and thin 316-SS plates, respectively) at the 5/2010 ARIES meeting. There is a large amount of data remaining unknown relating to the re-weldability limit for our candidate ferritic steel materials.
Power Plant Safety Analysis - Paul Humrickhouse has completed many changes in the ARIES-ACT MELCOR code to reflect the most current design. One major change was adding the shielding plugs (or doors) on the inboard region of the maintenance ports. These plugs are not pressure boundaries. Laila has provided Paul with the current decay heat parameters for the accident scenarios being considered. Paul is also working on the safety analysis documentation paper, although he will be a little late submitting the draft.
Power Core Coolant Manifolding and Plumbing Routing - [Christine Koehly was on the call and intended to describe her recent work, but Les Waganer failed to recognize that she wanted to speak at the end of the call and the call terminated without her giving her report. ]
Christine Koehly has been updating her design of the SCLL coolant manifolding and plumbing to improve the design approach. In addition, she has been developing a conceptual design for the DCLL coolant manifolding and plumbing approach. She will develop a presentation on both designs and Xueren Wang will present her findings at the May meeting.