Author Topic: RS EVA VKD-61 - Nauka outfitting/RTOd leak tasks - Oct 25 2023 (Kononenko, Chub)  (Read 12851 times)

Online Yellowstone10

Chub Kononenko opened valves 1-KL and 2-KL on a bypass line of some sort.
« Last Edit: 10/25/2023 07:30 pm by Yellowstone10 »

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Actually Chub this time, working on closing some valves at the radiator itself. (Navias has gotten them backwards a few times.)

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More valves. MCC-Moscow suggests that Chub might want to take a short break.

Edit - interestingly, he did a couple (4 and 5) with a wrench and then the rest with a hand tool. Not sure what the difference was there? The ones that he's doing by hand (6 to 9), he's doing a quarter turn at a time down the row, then repeating that over and over.
« Last Edit: 10/25/2023 07:42 pm by Yellowstone10 »

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Navias reports that they are 25-30 minutes ahead of schedule.

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Chub is now on his 26th pass over the valves, one-quarter turn at a time... He was warned that some coolant might come out after this point, so to be careful.

And now up to 29!

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Chub eventually got to 34 quarter-turns, then Kononenko opened valve KR-2 (I think) to connect the radiator loop to the coolant reservoir. They wrapped up with close-out photos.

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Chub is reviewing the radiator - he reports some black spotting and slight rippling in the panels.

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Got called off into a meeting at just the wrong time - there's now a large blob of coolant on one of the lines at the radiator joint, that's occasionally spitting off droplets.

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One end of a tether got soaked in coolant and was splashing droplets around. The spacewalkers have been told to leave the area. They quite sensibly concluded that the famous Russian space towels would not be up to the job of cleaning that up.

Edit - added a picture of the tether getting wetted by the coolant.
« Last Edit: 10/25/2023 08:36 pm by Yellowstone10 »

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Kononenko and Chub are now back at Poisk to retrieve the equipment for their next tasks.

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Kononenko has the radar antenna, but one of the deployment pins has popped out prematurely. They're trying to get it re-seated, but can't seem to push it far enough in - don't really have anything thin enough.

Update - they found a wrench that did the trick.
« Last Edit: 10/25/2023 08:55 pm by Yellowstone10 »

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Here's a freeze-frame showing a bubble that's just about to pop - shows exactly where the point of the leak is.

Offline centaurinasa

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Quote
RS EVA-61 (ET: 3:15; 5:04pm EDT): Kononenko and Chub are now working to install a mini synthetic aperture radar instrument on a fixture attached to the Nauka module; no more work at the radiator leak site is planned

https://twitter.com/cbs_spacenews/status/1717288264455913607
To boldly go where no human has gone before !

Offline centaurinasa

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After arranging their cargo, the spacewalkers are now returning to Nauka for the installation of a remote-sensing radar, the module's first scientific instrument:

https://twitter.com/RussianSpaceWeb/status/1717287625021706472
To boldly go where no human has gone before !

Online Yellowstone10

The spacewalkers are back down at Nauka, pretty close to the radiator - I haven't heard any remarks about any change of procedure to avoid the coolant blob, so they must not be too worried.

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Heading to the next worksite, although apparently a handrail wasn't quite in the spot they expected, which caused a bit of difficulty.

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Sunrise on the ISS.

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Another view of the Napor-miniRSA radar antenna on its mounting frame.

Edit - also, there's the portable workstation that was deployed during the previous Russian spacewalk.
« Last Edit: 10/25/2023 09:36 pm by Yellowstone10 »

Offline Robotbeat

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What is the actual coolant composition?
Chris  Whoever loves correction loves knowledge, but he who hates reproof is stupid.

To the maximum extent practicable, the Federal Government shall plan missions to accommodate the space transportation services capabilities of United States commercial providers. US law http://goo.gl/YZYNt0

Online Yellowstone10

MCC-Moscow: "OK guys, relax, rest, and enjoy the view."

Cosmonaut: "That's what we're doing!"

(Mission Control has repeated themselves several times. They seem dubious.)

What is the actual coolant composition?

Some type of silicone oil - polymethylsiloxane or something like that. Not particularly volatile, as you can tell.

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