Author Topic: MLM radiator leak 9 October 2023  (Read 11084 times)

Offline bobthemonkey

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Re: MLM radiator leak 9 October 2023
« Reply #20 on: 10/09/2023 08:03 pm »
It's early to ask, but are repair of the leaking radiator, or removal and replacement of the EVA-installed radiator, possible?

Radiator repairs have never been performed on orbit. The Rads on the USOS are ORUs are segmented (each of the main radiator assemblies is made up of 4 ORU) and have been swapped before.

The Russian radiator in question uses a different design, but was installed on orbit, so in principle could be replaced but would suggest that's unlikely for a number of reasons.
« Last Edit: 10/09/2023 10:17 pm by bobthemonkey »

Online Targeteer

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Re: MLM radiator leak 9 October 2023
« Reply #21 on: 10/09/2023 08:14 pm »
The SSRMS is heading toward a docking fixture.  Likely a walkoff in progress but is it to the EVA support location or towards the Russian segment to image the MLM?
« Last Edit: 10/09/2023 08:15 pm by Targeteer »
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Online Yellowstone10

Re: MLM radiator leak 9 October 2023
« Reply #22 on: 10/09/2023 08:16 pm »
The SSRMS is heading toward a docking fixture.  Likely a walkoff in progress but is it to the EVA support location or towards the Russian segment to image the MLM?

They're stowing Dextre on the MBS.

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Re: MLM radiator leak 9 October 2023
« Reply #23 on: 10/09/2023 08:35 pm »
Radiator repairs have Neve been performed on orbit. The Rads on the USOS are ORUs and segmented (each of the main radiator assemblies is made up of 4 ORU) and have been swapped before.

To clarify - the radiator panels themselves on the USOS have never been replaced or swapped (but the various pumps and tanks for the ammonia and nitrogen pressurant in the ETCS have). There is one spare Heat Rejection System Radiator (HRSR) on ELC-4, but it hasn't been needed.

Offline rdale

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Re: MLM radiator leak 9 October 2023
« Reply #24 on: 10/09/2023 09:46 pm »
Apparently nobody all comms have stopped in the ISS since the C&W issues started as the archive is empty but the feed seems to be running fine. All must be fixed?

:)

Online Targeteer

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Re: MLM radiator leak 9 October 2023
« Reply #25 on: 10/10/2023 12:41 am »
International Space Station Operations Update

At approximately 1 p.m. EDT Oct. 9, NASA flight controllers in mission control at the agency’s Johnson Space Center in Houston, using cameras on the International Space Station exterior, observed flakes emanating from one of two radiators on the Roscosmos Nauka Multipurpose Laboratory Module (MLM). The flight control team informed the crew aboard the space station of the potential leak, and NASA astronaut Jasmin Moghbeli confirmed the presence of the flakes from the cupola windows, after which the crew was asked to close the shutters on U.S. segment windows as a precaution against contamination.

The crew aboard station was never in any danger.

Roscosmos confirmed that the observed leak is on Nauka’s backup radiator, which is mounted to the outside of the module. The radiator was delivered to the space station on the Rassvet module during space shuttle mission STS-132 in 2010. It was transferred to the Nauka during a Roscosmos spacewalk in April. The primary radiator on Nauka is working normally, providing full cooling to the module with no impacts to the crew or to space station operations.

Teams on the ground will continue to investigate the cause of the leak, and additional updates will be made as available.

[FST edit to add:

https://blogs.nasa.gov/spacestation/2023/10/09/international-space-station-operations-update/ ]
« Last Edit: 10/10/2023 05:40 am by FutureSpaceTourist »
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

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Re: MLM radiator leak 9 October 2023
« Reply #26 on: 10/10/2023 01:02 am »
We have our first view of the radiator, but it's far too low-resolution to see any details.

Offline Asteroza

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Re: MLM radiator leak 9 October 2023
« Reply #27 on: 10/10/2023 04:53 am »
Will they wait until the radiator leaks all of it's coolant before firing up ERA to go take a look?

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Re: MLM radiator leak 9 October 2023
« Reply #28 on: 10/10/2023 05:31 am »
So if I'm recalling correctly there was an IV ORU that was used to fill up the RTOd radiator after it was installed and deployed during VKD-58. There was some duscussion whether this was launched and already integrated with Nauka, or delivered separately via Progress, but in any case it should be replaceable. If this is indeed the case, the cooling fluid itself could be refillable as soon as the leak is fixed on the hardware.

Of course, the leak can be difficult to repair, or even impossible. If the whole radiator needs to be R&R'd, I'm not sure any VV is actually able to physically bring a spare up (maybe HTV-X? Which is still unproven though), irrespective of it being politically acceptable given Russia's restricted collaboration with the other ISS international partners.

But it's also possible a flexible hose has just been degraded after so many years folded in storage, and can be changed out with a reasonably risky EVA, now that ERA (and the SSRMS in case of need) is fully operational. Would be interesting to have the specs for "foreseeably replaceable" parts in the RTOd, not sure if it's documentation that could have been publicly accessible. Anyway, the RS has seen some unforeseen EVA scenarios during its lifetime, as well as legacy occasions in Mir and elsewhere, so if it's at all plausible I'm guessing they will try, budget allowing.
-DaviD-

Online daedalus1

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Re: MLM radiator leak 9 October 2023
« Reply #29 on: 10/10/2023 06:45 am »
This points to a design fault on this and the Soyuz leaks, not micrometeoroid impacts as Roscosmos stated.

Online eeergo

Re: MLM radiator leak 9 October 2023
« Reply #30 on: 10/10/2023 10:14 am »
This points to a design fault on this and the Soyuz leaks, not micrometeoroid impacts as Roscosmos stated.

Not nearly comparable: Soyuz and Progress are launched afresh and never spend more than about 6 months in orbit, as per their relevant certifications. The RTOd was certified for long-term operation in orbit, although how much it could be kept in storage without incurring in probable damage is unknown (publicly). Presumably it was within its margins if they decided to go ahead with installation, but reliability assessments are always probabilistic.

Remember an independent party (NASA) has concurred with the conclusion that the Soyuz leak came from the exterior environment -they are not ready to blame MMOD just yet, but it's a possibility- and was (plausibly) not an intrinsic defect the S/C had.

Nobody is blaming MMOD for this latest leak, yet. The environment seen by the RTOd during a decade of exposed on-orbit storage is much different than what the VV PAOs see.
-DaviD-

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Re: MLM radiator leak 9 October 2023
« Reply #31 on: 10/10/2023 02:57 pm »
It looks like ERA's end effector camera is pointed at the base of the RTOd.

Just a trick of the light - one end of the arm is in shadow. It's in the same stowed position as usual. (Photo is from September before MS-23 departed.)

Online FutureSpaceTourist

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Re: MLM radiator leak 9 October 2023
« Reply #32 on: 10/10/2023 05:54 pm »

Offline illectro

Re: MLM radiator leak 9 October 2023
« Reply #33 on: 10/10/2023 07:32 pm »


I wish I had more information than was already presented here.

Offline litton4

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Re: MLM radiator leak 9 October 2023
« Reply #34 on: 10/11/2023 07:43 am »
Eric Berger article.

The lead photo is a bit misleading as at first sight it looks like a picture of a leak "snowstorm", but it is just a stock photo of the modlue with Earth in the background.

https://arstechnica.com/space/2023/10/for-the-third-time-in-a-year-russian-hardware-on-the-space-station-is-leaking/
Dave Condliffe

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Re: MLM radiator leak 9 October 2023
« Reply #35 on: 10/11/2023 07:24 pm »
Good news, within the severity:

https://twitter.com/RussianSpaceWeb/status/1712158103947325718

Quote
Sergei Krikalev, Roskosmos Executive Director for Piloted Spaceflight, said that Monday's coolant leak took place from one (inactive) manifold of two external cooling loops serving the add-on radiator on Nauka. The system still retains functionality thanks to a backup line. At the time of the accident, only one loop (not leaking one) was operating because load on the thermal control system was light in the absence of payloads aboard Nauka. A pump serving the leaking manifold was off at the time. There is hope to fix the system if it is needed. Cosmonauts aboard ISS are being instructed how to access and inspect the leak area during the upcoming VKD-61 spacewalk on Oct. 25. Also, the ongoing analysis aims to determine whether the damaged manifold can be re-sealed and refilled with coolant
-DaviD-

Offline Robotbeat

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Re: MLM radiator leak 9 October 2023
« Reply #36 on: 10/11/2023 08:15 pm »
“Just” need some good epoxy. Or Xenonite.
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Offline cohberg

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Re: MLM radiator leak 9 October 2023
« Reply #37 on: 10/11/2023 08:25 pm »
What is xenonite, question?
« Last Edit: 10/11/2023 10:30 pm by cohberg »

Online tbellman

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Re: MLM radiator leak 9 October 2023
« Reply #38 on: 10/11/2023 10:29 pm »
What is xeonite, question?

Xenonite (not xeonite) is a science fiction equivalent to mithril. :)  It is a fictious material with extremely high tensile strength, made mostly from xenon.  It comes from Andy Weir's novel Project Hail Mary.

Offline Robotbeat

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Re: MLM radiator leak 9 October 2023
« Reply #39 on: 10/11/2023 10:41 pm »
What is xeonite, question?

Xenonite (not xeonite) is a science fiction equivalent to mithril. :)  It is a fictious material with extremely high tensile strength, made mostly from xenon.  It comes from Andy Weir's novel Project Hail Mary.
Super-epoxy.
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

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