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Navy Closes 4 Puget Sound Submarine Dry Docks Following Earthquake Risk Study
January 27, 2023 2:25 PM
news.usni.org
[The Los Angeles-class fast-attack submarine USS Olympia (SSN-717) arrives at Puget Sound Naval Shipyard for a port visit in January 2017. US Navy photo.]
Four dry docks the Navy uses to overhaul nuclear submarines in Washington are temporarily closed after the service found they are at risk for earthquake damage, service officials told USNI News on Thursday.
The dry docks, three at Puget Sound Naval Shipyard & Intermediate Maintenance Facility in Bremerton, Wash., and the delta pier at the Trident Refit Facility in Bangor, Wash., are still certified to overhaul nuclear submarines, but the Navy has decided to keep the dry docks empty pending further investigation.
“The seismic assessment and expert validation enhances the Navy’s knowledge of the potential issues associated with a large earthquake occurring during a submarine maintenance availability,” reads a statement from the service.
“With this new knowledge, the Navy determined that it needs to remediate specific vulnerabilities to ensure the safety of the shipyard workforce, sailors, the local public, the environment and the submarines.”
As a result of the findings, the Navy over the last week brought in about one hundred experts from across the fleet and outside the service to assess the seismic risk to the dry docks, a Navy official told USNI News.
“The risks are still not fully quantified. What we’re doing is no different from what anyone in the Northwest that has facilities is doing – the risk is not localized here. It’s really a regional risk,” a separate service official told USNI News.
The pause at the dry docks will not result in the reduction of the 14,000 personnel working at the yard, the Navy said on Thursday.
The Navy established PNSY in 1901, with the oldest of the six dry docks originally built in 1906. The dry docks the service has closed are four of the newest ones. Dry Dock 4 and 5 were both built in the early 1940s, while Dry Dock 6 – used for aircraft carrier overhauls – was completed in 1962.
The delta dry dock that’s 13 miles away in Bangor was completed in the 1980s as part of the Navy’s support systems for its nuclear ballistic-missile submarine fleet.
“They are all constructed differently and out of an abundance of caution we want to take a look at all of them,” a second Navy official told USNI News.
The Navy has for years known of the seismic risk to Puget Sound, as the facility sits on multiple fault lines, USNI News understands. It’s unclear what new information the Navy gleaned from the recent seismic assessment.
The yards in Bremerton and Bangor sit near a major fault line that runs from Northern Vancouver Island to Cape Mendocino, Calif. In 2001, an earthquake with an epicenter near the shipyard prompted the service to look at the risk to the shipyard.
“Following the 2001 Nisqually earthquake, seismic vulnerability studies identified high-risk facilities in the shipyard, and in response, the Navy began planning and implementing significant seismic upgrades,” reads a Thursday statement from the Navy.
cont...
https://news.usni.org/2023/01/27/navy-closes-4-puget-sound-submarine-dry-docks-following-earthquake-risk-study