Drawing from information from The Barents Observer August 4/5, 2021 and Submarine Matters' records.
Orel, is a nuclear propelled Oscar II-class SSGN home based at Russia’s Northern Fleet Arctic Ocean complex. Orel had been attending a fleet review at St Petersburg in the
Baltic. It, in company with Russian Navy surface vessels, was returning surfaced (while traversing the narrows at the mouth of the Baltic) on its way back to its Arctic Base.
On July 30, 2021, in the narrow mouth of the Baltic Danish naval vessels noticed Orel had stopped and was drifting towards the small Danish island of Sejerø. Around 10 Orel crew members were seen on the casement in front of Orel’s sail possibly ready to tie down a tow line rocket "thrown" from a rescue vessel. That vessel was the nearby 5,000 ton Russian naval tug Altay which drew close. But Orel soon communicated it no longer needed assistance.
Orel, still surfaced, resumed
movement under its own power. It and accompanying Russian vessels moved west
through the mouth of the Baltic then north into the North Sea. Here Orel
submerged but probably remained shallow for safety reasons.
NATO sensors (on the seafloor,
surface ships and submarines including the Norwegian Navy’s Ula-class subs) would be able to estimate if Orel was (or is) moving at reduced speed.
Orel may have lost propulsion for many reasons. One possibility is a non-radioactive pipe or boiler leak from one of Orel’s two reactors. For subs with the luxury of two reactors a leak can demand an emergency shutdown of the effected reactor, called a “SCRAM”.
Some limited battery backup for Orel could maintain “hotel load” services for a short time. Additionally if Orel has one or more diesel engines for backup
(as most nuclear subs have) then hotel load and some propulsion
could be achieved – maybe for a few days. In any case if one of Orel's reactors remains operational it can run submerged, to save face, and at slow speed (perhaps 10 knots?) while remaining close to the tug Altay.
Circle at the top of the
yellow-green trace indicates position 20 hours ago of Norwegian Coast Guard
vessel KV Bergen (photo inset) shadowing the Russian flotilla probably assisting
Orel. KV Bergen has since turned
around. (Map above is a screenshot from MarineTraffic via Barents
Observer.)
---
Orel’s age, 29 years since being launched in 1992, shouldn’t be a problem if she was regularly serviced and suffered no major damage.
BUT OREL DID SUFFER MAJOR DAMAGE A FEW YEARS AGO
Regular Submarine Matters readers may recall Orel suffered a serious fire in early April 2015. See Submarine Matters “Russian Submarine Fire - Orel Perhaps a Write-Off?” of April 8, 2015. The fire occurred above the rear section of Orel, above the reactor and other propulsion machinery (like the reduction gears and key electrical motors and wiring).
Also the 2015 fire, which occurred between the outer hull and pressure hull of double hulled Orel, could have caused lasting damage to the outer hull that Russia's maintenance/repair system didn't detect. If there was cracking of the outer hull on July 30, 2021 this could have let in an unexpected weight of seawater not managed by Orel's buoyancy system. Orel may have needed to stop and drift while the seriousness of any buoyancy surprise was assessed. Some reprogramming of the buoyancy computer system may have been needed.
Cracking of the outer hull may have also caused part deformation of that hull, which could cause extra hydrodynamic "drag" and noise.
So Orel’s 2015 fire may have done delayed damage to Orel's propulsion, buoyancy or deformation drag. These may be the products of the Russian Navy's accident prone maintenance system, again apparent today.
Jive Turkey has a detailed YouTube video of the Oscar SSGN for Sub Brief, and speaks a bit about the K-266
ReplyDeletehttps://youtu.be/C5eVKRU5wvs
Hi Pete,
ReplyDeleteAnd the problems continue Russian nuclear submarine had engine problems in Danish waters
"The Russian nuclear-powered submarine "Orel" sailed on the surface through Danish waters when it had problems with propulsion, writes The Barents Observer. The submarine drove with other Russian ships on its way back to its base on the Kola Peninsula in Russia, after being at the naval parade in Saint Petersburg."
/Kjell
Curiously, a WC-135W Constant Phoenix has flown over the area the Orel sailed though
ReplyDeletehttps://www.thedrive.com/the-war-zone/41850/curious-mission-flown-over-the-baltic-sea-by-u-s-air-force-nuke-sniffing-plane
Two "coincidences" have occurred shortly after Orel's unexplained propulsion shutdown:
ReplyDelete1. The Russian military claims nothing happened https://www.urdupoint.com/en/world/danish-media-reports-claiming-russian-nuclear-1319713.html
and
2. America's one and only radiation "sniffing"/detection WC-135W Constant Pheonix aircraft flies all the way from Nebraska on July 28. This allowed it to be in time to fly over the Baltic and adjacent countries sniffing for radiation just after Orel's witnessed propulsion shutdown - see https://www.thedrive.com/the-war-zone/41850/curious-mission-flown-over-the-baltic-sea-by-u-s-air-force-nuke-sniffing-plane
Could it be US intelligence already knew something was wrong with at least one of Orel's reactors before Orel's propulsion shutdown!?
Hi Shawn C
ReplyDeleteThanks for Jive Turkey/Sub Brief's Oscar video at https://youtu.be/C5eVKRU5wvs with mentions of Orel K-266 in the last 7 minutes. Russia must be desperate if its cutting costs by doing major upgrades to the Oscar-IIs which are already 30 years old.
Could be Orel's upgrades (including reactor cooling) were rushed resulting in the apparent breakdown on July 30 2021.
Yes I also noticed the WC-135W Constant Phoenix article at https://www.thedrive.com/the-war-zone/41850/curious-mission-flown-over-the-baltic-sea-by-u-s-air-force-nuke-sniffing-plane
All very curious that aircraft was on its way from the USA to the Baltic even BEFORE Orel apparently lost reactor propulsion.
Hopefully the US will publish the results of the radiation "sniffing"
Regards
Pete
Pete,
ReplyDeleteAs some have mentioned, the Russians tend to conduct missile tests in the White Sea, and due to weather patterns, the Baltic could be a good 'spot' to pick up traces.
https://jamestown.org/program/russias-northern-fleet-test-fires-tsirkon-cruise-missile/
Hi /Kjell
ReplyDeleteThanks for https://forsvaretsforum.no/atomsikkerhet-forsvarets-operative-hovedkvarter-russland/russisk-atomubat-fikk-motorproblemer-i-dansk-farvann/210845
So it seems Orel was being towed by Altay for a short times after all. Maybe the Danes or Norwegian owned Barents Obswerver https://thebarentsobserver.com/en/security/2021/08/russian-nuclear-submarine-lost-propulsion-danish-waters-sails-outside-norway-now
did not say that openly because Denmark and/or Norway did not want to embarrass the Russians. Or message was lost in translation.
Regards
Pete
Hi Shawn C [your Aug 6, 2021, 8:22:00 PM comment]
ReplyDeleteYes sniffing over the Baltic to catch radioactive particles blowing West South West from the Russia's White Sea area is possible.
One of Putin's wonder weapons, the future nuclear propelled 9M730 Burevestnik missile would leave interesting traces https://en.wikipedia.org/wiki/9M730_Burevestnik#Nyonoksa_radiation_accident .
Regards
Pete