From: Thomas G. Brown
Sent: Thursday, May 26, 2005 11:46 AM
To: Hutch Neilson; Wayne T. Reiersen; Lawrence E. Dudek; William R.
Blanchard; Jerry D. Levine; Paul Goranson (goransonpl@ornl.gov); Nelson,
Brad E.; Mike Cole
Subject: NBI transition port selection

Attachments: Duct_cost_final_b.xls

This is a follow-up to the NBI transition port issue.  Bill has made a number of pump calculations considering ducts attached to a diamond shaped NBI transition port as well as locating a 24" duct off Port 4.  He concluded that an adequate pumping speed (1575 lps) can be achieved using two turbo pumps attached to 24" ducts welded to a reworked Port 4 blank-off flange. Bill has money in his WBS to cover the cost of engineering and fabrication of the pump ducts. He also could pump off the NBI port if a 24" port were available.

Jerry Levine spoke with Jim McGuire & Bill Slavin about using Port 4 with the 10.25" restricted area for manned access.  His comments were, "While there are apparently no hard and fast requirements about the size of manned access openings, the 10.25” wide opening could be very restrictive for emergency rescue purposes.  We would like to see the largest possible opening used for manned access, e.g., a neutral beam port.  There is no requirement to have two access ports."

So with Bill taken care of, the lack of a manned access was the remaining open issue.  Paul has updated his costing exercise looking at the possibility of revising his Mod kit to add a round duct.  The attached spreadsheet provides a cost summary of providing a 24" duct to his basic VV support Mod kit.  Brad indicates that it "may" go down to a 22" duct after looking a MC clearance issues.  The SS construction cost for a 24" duct mod tool kit is $66,998 and an Inconel option cost $75,269.  The $8271 difference allows the ability to go to a 350 degree bakeout without the need to upgrade the Mod kit.  As a reference the original NB transition duct cost $172k and Paul's original Mod kit had a cost estimate of $45k.

Hutch, Wayne I believe that all issues have been covered for a decision to be made.

-Tom


-----Original Message-----
From: Thomas G. Brown 
Sent: Thursday, May 19, 2005 12:41 PM
To: Hutch Neilson; Wayne T. Reiersen; Nelson, Brad E.
Cc: Paul Goranson (goransonpl@ornl.gov); William R. Blanchard
Subject: NBI port options

Wayne, Hutch, Brad
 
The attached ppt file presents some options that address issues of VV lateral support, pump duct addition and manned access to the VV.  Paul has been reworking the attached spreadsheet to address all the options.  To summarize the situation:  There is no money in the budget for the transition ports ($172,000 listed as item #1 in Paul’s spreadsheet).  Paul defines a Mod kit (Item #3 at $45k) to take care on the VV lateral support but does not cover the need for manned access or pumping.  The diagnostic port 4 could be considered for this but the port geometry has a 10.25” width restriction that makes it very (very) difficult for manned access and unattractive for pumping.  If you jump to option #6, this includes two Mod kits and a simplified (diamond shape) pump duck joined to a reworked NB port blankoff flange ($48.5k).  Option #6 would cover the needs of VV lateral support and provide one relatively large port to which a pump duct can be attached.  Bill has money in his WBS to cover the cost of an additional duct to connect to two turbo pumps.  The drawback from this approach is that manned access is not provided, other than going through the pump port or inhaling greatly and slinking through the port 4’s.  To cover all conditions (other than returning to Option #1) is to go to Option #6a and provide the diamond shaped (pumping compatible) port on all NBI ports for a cost to WBS 12 of $71,460.  Bill can cover his shared cost.  Taking this route results in a cost saving of about $100 k over the original NBI transition duct approach but cost $26,460 over the least cost Mod kit option (#3); but still leaves an unbudgeted cost of $71K.  
 
Where do we go from here?
 
Tom
 
 
 
 
Tom Brown
Princeton Plasma Physics Lab
PO Box 451
Princeton, NJ 08543-0451
 
Phone: (609) 243-2156       fax: (609) 243-3030