Astute Buy? Britain Spends Big on its Next Fast Submarines

Apr 14, 2013 15:00 UTC by Defense Industry Daily staff

Astute, pre-launch
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Britain retired its nuclear-powered 4,900t SSN Swiftsure Class fast attack boats in 2010, and has begun phasing out its follow-on 5,300t SSN Trafalgar Class, before the effects of the ocean’s constant squeezing and release start making them dangerous to use. The last Trafalgar Class boat is expected to retire by 2022, and replacements were required. Submarines are considered to be a strategic industry in Britain, which remains committed to nuclear-powered submarines for their entire fleet. As such, there was never any question of whether they’d design their own. The new SSN Astute Class were designed to be stealthier than the Trafalgars, despite having 39% more displacement at 7,400t submerged.

Britain’s 6 Swiftsure and 7 Trafalgar Class boats will eventually find themselves replaced by 7 of the new Astute Class. The new submarine class has had its share of delays and difficulties, but the program continues to move forward with GBP 2.75 billion in contracts over the past week.

The New Astute Class SSNs

Nuclear weapons are reserved for Britain’s 4 SSBN Vanguard Class boats, but the Royal Navy’s SSNs have a unique role of their own in their fleet. They’re the only platforms used to launch long-range UGM-109 Tomahawk cruise missiles, in order to deliver conventional strikes against land targets. Other navies also use surface ships for this role, but Britain chose not to.

The Astute Class will offer the novel feature of a bunk for each submariner, plus stealth enhancements via rafted sections throughout and new coatings, exterior tiles, and paints; a new 2076 Stage 5 sonar system that combines arrays all over the submarine; an twin optronic day/night periscope that doesn’t pierce the hull; advanced electronic eavesdropping gear; a common base computing environment for critical systems; high-bandwidth communications; space for a combination of 38 UGM-109 Tomahawk Block IV cruise missiles and Spearfish heavyweight torpedoes; and other enhancements.

The first 3 Astute Class boats cost about GBP 1.22 billion each (about $2.4 billion in 2008), a price tag that’s very similar to the USA’s new 7,300t Virginia Class. Like the Virginias, they will never need to have their nuclear reactors refueled during their 25-year service life.

After HMS Astute has come S120 Ambush, with S121 Artful, S122 Audacious, S123 Anson, S124 Agamemnon, and S125 Ajax in various stages of planning and construction. All Astute Class submarines will be based at HM Naval Base Clyde, where a GBP 150 million state-of-the-art jetty was built for them.

Contracts & Key Events, 2007 – Present

April 11/13: Without ever mentioning HMS Ambush’s breakdown the previous day, the Royal Navy puts out a press release that says HMS Astute will be operational in 2013, after hot weather trials and operational sea training. S119 Astute was commissioned on Aug 27/10.

HMS Ambush [S120] will go through the same trials and training and “be ready to deploy in early 2014.” It remains to be seen what effect yesterday’s breakdown will have on that schedule. Royal Navy.

March 10/13: Aging fleet. Britain’s Daily Express says that Britain’s submarine fleet is now finding it difficult to maintain patrols around the Falkland Islands, even as Argentina becomes more aggressive:

“THE Navy is finding it “increasingly difficult” to deploy a nuclear hunter-killer submarine to patrol British waters around the Falkland Islands. Senior sources made the warning last night, three weeks after the Sunday Express reported exclusively that the forced return of HMS Tireless [due to a reactor leak] means that just one of Britain’s five Trafalgar-class submarines is fully operational and even that is about to undergo a brief period of maintenance after duties in the Middle East…. HMS Torbay is undergoing maintenance, HMS Trenchant will need servicing after its deployment in the Middle East, HMS Talent is awaiting decommissioning and HMS Triumph, which should have been decommissioned last year, is being used for training.

HMS Astute, the first of our new £1.2billion Astute class submarines, is still not fully operational.”

Feb 25/13: Sub-contractors. Thales announces a contract from BAE for the last 2 Sonar 2076 systems in the Astute program, to equip Agammemnon and Ajax as long-lead buys. Those are the last submarines in the program.

A complete sonar system includes both inboard and outboard of the bow, fin, intercept and flank arrays, and the associated inboard processing. The cost of this contract isn’t announced, but based on past contracts, it’s more than GBP 60 million.

Feb 22/13: BAE’s overall results were down in 2012, but the submarine yard in Barrow is one of the bright spots, thanks to work on the Astute SSN program and the Successor Class next-generation SSBN. North-West Evening Mail.

Feb 17/13: Radiation Leak. The Trafalgar Class fast attack boat HMS Tireless experiences a small reactor coolant leak. It’s contained within the sealed reactor compartment, but the submarine will be out of action for 10 months in drydock. The boat was launched in 1984, had experienced a previous radiation leak off of Gibraltar in 2000, and was due for decommissioning in 2013. The only reason this wasn’t the end of her career is the Astute program’s delays, which led to Navy to extend her planned service to 2017.

The incident underscores the issues involved in operating submarines beyond their expected lifetimes. It also underscores issues with British force structure. Right now, the Royal Navy has 7 SSNs, but HMS Tireless is out of action, HMS Astute still isn’t fully operational after running aground in 2010, and a 3rd boat is in maintenance. That leaves just 4 operational submarines, instead of the recommended 7 + 1 spare. Scottish Express.

Feb 13/13: Reactors. The UK MoD signs a 10-year, GBP 800 million (then about $1.2 billion) contract with Rolls Royce, financing the Submarines Enterprise Performance Programme (SEPP) envisioned in the 2010 SDSR. The goal is to consolidate costs under one contract with consistent incentives, and improve operational efficiency in the infrastructure that delivers and supports the UK’s naval nuclear propulsion systems. They’re hoping for a GBP 200 million saving over this 10 years. Time will tell.

SEPP isn’t technically part of any one program. Contracts for products and services to deliver and support the submarine programs themselves will continue in parallel. Royal Navy | Rolls Royce.

Feb 1/13: Sub-contractors. Babcock announces a contract to supply its weapon handling and launch system (WHLS) for the 6th and 7th Astute class submarines, with a total value around GBP 55 million.

The WHLS and its combat system interfaces were developed to handle the complicated task of loading, moving, and readying large weapons like heavy torpedos, missiles, mines, etc. within the confined space of a submarine. Babcock’s Weapons Handling Equipment (WHE) sub-system uses a semi-automated and modular approach to maximize storage, and a “unique” method of shock mounting that offers adaptable protection according to the number of weapons stored on each stowage tier. Babcock’s programmable firing valve (PFV) technology allows the system to match the launch requirements precisely to a range of variables including weapon type, boat speed and depth, using less air and making less noise.

Babcock WHLS systems are used in Britain’s Astute Class, and a variant will also be featured in Spain’s diesel-electric S-80 boats.

Jan 13/12: NAO Report. Britain’s National Audit Office releases their 2012 Major Projects Report [PDF]. The Astute Class is featured, and the table of planned vs. actual cost, time, and performance for various milestones on pg. 39 is interesting, but most of the program’s major dislocations lie in the past. They do offer a quick update regarding the fleet’s progress.

The Astute Class Training Service (ACTS) has provided training for the ships companies of both HMS Astute and Ambush, and delivered its 1st Submariner Qualification course for the Royal Navy.

S120 Ambush, launched in January 2011, has finished fitting out and is in trials and testing, following her first test dive in the shipyard’s basin in early October 2011.

S121 Arful continues construction in the Devonshire Dock Hall at Barrow, and “is making good progress”. Diesel Generator Trials successfully completed in August 2011.

S122 Audacious has had all hull and casing units moved to the Devonshire Dock Hall.

S123 Anson recently got underway with manufacturing, following her October 2011 keel-laying.

Dec 6/12: Common Combat System. Britain’s Ministry of Defence issues BAE Systems Maritime – Submarines a GBP 46 million contract to create a common combat & navigation system baseline for use in all of the Royal Navy’s nuclear submarines.

“The Royal Navy operates three classes of submarine, totalling 10 vessels, which are used to safeguard the UK’s interests around the world. Currently, different combat systems are used across the fleet. This new contract will help drive adoption of a common combat system across all current and future Royal Navy submarines, with considerable benefits to training, maintenance and updating costs.”

S122 Audacious will introduce a shared computing environment for the combat, navigation, and sonar systems, mounted in common consoles and cabinets, and using “commercial off the shelf” computing electronics. These changes are due to be implemented on the remaining submarines in the class, and have been back-fitted to S121 Artful. The eventual aim is to back-fit the “Common Combat System” to HMS Astute and Ambush, and progressively to the remaining SSN Trafalgar Class and SSBN Vanguard Class boats. The CCS would also implicitly cover Britain’s SSBN Successor submarines, currently in the initial design stages at BAE. UK MoD | BAE.

Sept 14/12: #2 trials. The Royal Navy announces that S120 Ambush is ready to depart the shipyard and begin sea trials, 9 years after she was laid down and 18 months since she was launched.

June 18/12: Reactors. Britain’s Ministry of Defense signs a GBP 1.1 billion contract with Rolls Royce for submarine nuclear reactor cores, (GBP 600 million) and industrial investment in the Raynesway plant that manufactures them (GBP 500 million). The contracts will secure 300 jobs at Rolls-Royce.

The nuclear reactor cores will be used to power the 7th and final SSN Astute Class fast attack submarine, and the 1st of the Royal Navy’s next generation of SSBN nuclear deterrent submarines, currently known as the Successor Class.

Rolls Royce is the sole Technical Authority for the UK Nuclear Steam Raising Plant, whose reactors have powered British nuclear-powered submarines for the past 50 years. The GBP 500 million infrastructure contract aims extend the operating life of the Rayneway plant in Derby, UK, by more than 40 years. Rolls-Royce will continue to maintain and operate its existing reactor core manufacturing facility, while undertaking a parallel phased rebuild and modernization of buildings on site. UK MoD | Rolls Royce | The Telegraph.

Feb 6/12: Sub-contractors. Thales UK announces a GBP 30+ million sub-contract from BAE Systems Submarine Solutions, to supply S123 Anson’s full Sonar 2076 Phase 5 system. Deliverables will include arrays both inboard and outboard of the bow, plus fin, intercept and flank arrays, and the associated inboard processing.

Thales UK is a major sub-contractor for the program as a whole. Beyond the sonar system, they also supply each Astute Class submarine with its 2 non-hull penetrating CM010 optronic masts, the mast’s UAP4 electronic support measures (ESM) system for gathering, classifying, and locating communications and radar emissions, the ECB680 communications and SEEPIRB emergency beacon buoys, and the UHF satellite communications antenna. Thales.

Sept 15/11: #5. Astute submarine #5 will take the name HMS Anson when she is commissioned. The 2012 NAO report suggests that this will be in August 2020. BFBS.

Feb 16/11: #4. BAE Systems delivers S122 Audacious’ final hull segment by public road through the town of Barrow-in-Furness, to the huge the Devonshire Dock Hall (DDH). It’s the 270 tonne forward dome.

The boat is still a long way from done. The process of installing all of the machinery in these framework units, and then beginning to join hull pieces, is quite long and exacting. BAE Systems.

Jan 6/11: #2 launched. S120 Ambush is launched. The submarine will still have a fitting-out period before it can even start contractor trials. Royal Navy.

Feb 12/10: Sonar 2076 upgrade. Thales UK announces the ‘Stage 5 Inboard Replacement’ (Stage 5 IR) contract from BAE Systems. They’ll upgrade 3 Trafalgar Class boats, and the first 3 Astute Class submarines, to Sonar 2076 Stage 5 system. Once all of the work is completed, 2076 Stage 5 will be fully deployed across the Royal Navy’s (RN’s) nuclear-powered attack (SSN) submarine fleet.

Thales’ Sonar 2076 is said to have 13,000 hydrophones spread between its inboard and outboard bow, flank, fin, and towed arrays. Stage 5 IR adds new hardware, new software functionality and new algorithms, while moving the sonar system to open architecture electronics. The UK MoD’s long term vision involves the evolution of a common sonar and combat system across their entire submarine flotilla, and an open architecture sonar system is an important milestone along that path. Thales | Aviation Week.

May 21/07: #4 lead-in. The UK MoD has announces a GBP 200 million contract (about $395 million) to begin preparing for construction of the 4th boat at the BAE Systems shipyard at Barrow-in-Furness in Cumbria.

This initial contract for S122 runs to March 2008, and covers initial build work only. The MoD aims to contract for the whole boat by late 2008, and detailed terms and conditions will be agreed over the intervening period.

Additional Readings

• Royal Navy – Astute Class

• BAE Systems – Astute Class

• BAE Systems – The Astute Launch

• Naval Technology – SSN Astute Class Nuclear Submarine, United Kingdom

• RUSI (October 2008) – Evolutionary Trends In UK Sonar [PDF]

• Royal Navy – Spearfish Torpedo. Range is just 14-30 miles, significantly below peers like Atlas Elektronik’s new Seahakes. British SSNs are a bit unusual in the modern era, in that they don’t carry anti-ship missiles as an option to accompany their torpedoes.

• DID – Tomahawk’s Chops: xGM-109 Block IV Cruise Missiles

• DID – New Nukes: Britain’s Next-Gen Missile Submarines. The SSBN Successor project, which would carry Britain’s future nuclear deterrent.