Subject: RE: Fwd: NSCX _ Port 12 _ Cable Testing From: "Goranson, Paul L." Date: Tue, 13 May 2008 09:21:20 -0400 To: Paul Sichta , Hutch Neilson CC: Larry Dudek , Mike Viola , Brent Stratton , Greg Tchilinguirian , glabik@pppl.gov This system is not designed for full heat load and would not survive. It depends on pulse modulation current control and a cryogenic heat sink; enen then it will never see over 20% loading. Paul G -----Original Message----- From: Paul Sichta [mailto:psichta@pppl.gov] Sent: Tuesday, May 13, 2008 9:07 AM To: Hutch Neilson Cc: Larry Dudek; Mike Viola; Brent Stratton; Goranson, Paul L.; Greg Tchilinguirian; glabik@pppl.gov Subject: Re: Fwd: NSCX _ Port 12 _ Cable Testing The PTP for thermocouples and heaters will hopefully get sent out Wednesday for review. The PTP does not verify thermocouple or heater performance over the expected operating range. We only 'bump' the signals to verify the correct physical location is wired per the dwgs. But, wouldn't it be better to run a heater to it's maximum rating (or at least our expected operating regime) to discover a problem with a heater (or localized heating effects) before machine assembly, so that problems can be corrected? The PTP for flux/rogowski/voltage loops will be a separate procedure. Probably ready for review next week. -ps Hutch Neilson wrote: > > Larry, Mike, Paul, and Brent: > > See comments from Goranson regarding heater tape testing. Contact Paul > > if there are further questions. > > Hutch > > > > Begin forwarded message: > > >> >> From: "Goranson, Paul L." >> >> Date: May 12, 2008 1:10:06 PM EDT >> >> To: Hutch Neilson >> >> Cc: "Cole, Michael" , Bob Simmons >> >> , Phil Heitzenroeder , "George >> >> W. Labik" >> >> Subject: RE: NSCX _ Port 12 _ Cable Testing >> >> >> >> There should be no problem if the current is limited to 10%. Full >> >> voltage must not be applied. The heaters go to about 760 C but under >> >> full power and poor contact that could be exceeded. It would be a good >> >> idea if some of the TCs should be monitored as well. Port 12 flange >> >> may not exceed 150 C with VV at 350 C. >> >> Paul >> >> >> >> From: Hutch Neilson [mailto:hneilson@pppl.gov] >> >> Sent: Friday, May 09, 2008 12:17 PM >> >> To: Goranson, Paul L. >> >> Cc: Cole, Michael; Bob Simmons; Phil Heitzenroeder >> >> Subject: Fwd: NSCX _ Port 12 _ Cable Testing >> >> >> >> Paul, >> >> Did you have any comments on Labik's test plans? They are planning to >> >> start next week. Are we at risk of doing any damage? >> >> Thanks, >> >> Hutch >> >> >> >> Begin forwarded message: >> >> >>> >>> From: "George W. Labik" >>> >>> Date: May 9, 2008 11:53:26 AM EDT >>> >>> To: "Hutch Neilson" >>> >>> Subject: FW: NSCX _ Port 12 _ Cable Testing >>> >>> >>> >>> >>> >>> From: George W. Labik >>> >>> Sent: Friday, May 02, 2008 4:14 PM >>> >>> To: 'Goranson, Paul L.' >>> >>> Cc: Paul Sichta; Greg Tchilinguirian >>> >>> Subject: NSCX _ Port 12 _ Cable Testing >>> >>> >>> >>> A test procedure is being developed to check all the cables on each >>> >>> vacuum vessel segment. This procedure may be implemented a number of >>> >>> times as the machine assembly progresses. >>> >>> >>> >>> The heaters will be checked by driving them with a power supply and >>> >>> we are considering whether to drive the heaters at 10-20% or higher. >>> >>> What is the maximum differential temperature permitted between the >>> >>> Port 12 nozzle and the vacuum vessel and the Port 12 flange? What is >>> >>> the maximum temperature the heater lead wires can sustain without >>> >>> damage? Presently most of the lead wires are in contact with the SS >>> >>> shim that covers the heater tape. If the heat transfer coupling to >>> >>> the port is weak I envision the heater tape getting very hot. >>> >>> >>> >>> The heater leads and thermocouples will be checked for continuity and >>> >>> impedance to vessel ground. We are considering a 100 to 300 volt >>> >>> differential for this test. The electronics will be floated during >>> >>> operations. >>> >>> >>> >>> You will be listed as a reviewer to the Test Procedure. >>> >>> >>> >>> Please send me your comments. >> >> > > > >