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Why the USS Thresher (SSN 593) Was Lost
Hardcover
Technology & EngineeringBoatingNaval History
ISBN13: 9781608881680
Publisher: Nimble Books
Published: Dec 31 2017
Pages: 62
Weight: 0.98
Height: 0.25 Width: 8.50 Depth: 11.00
Language: English
The US nuclear submarine THRESHER (SSN-593) was lost because standard compensation procedures to adjust for hull compression during the deep-dive on 10 April 1963 were not followed. Consequently, THRESHER was heavy (negatively buoyant) at test-depth (1300 feet) and unable to deballast because adiabatic cooling froze moisture in the air-lines to the ballast tanks, blocking those lines.
Operation of the Reactor (Main) Coolant Pumps in FAST (2-pole mode) may have contributed to a reactor scram (shut-down) and loss of propulsion at 0909.0R (local time). THRESHER sank at an average rate of 120ft/min from test-depth (1300-feet) at 0909.0R to collapse at 09:18:24R at a depth of 2400-feet (1070 psi) in 1/20th of a second, too fast to be cognitively recognized by those aboard who - although they knew collapse was imminent - never knew it was occurring.
The Navy Court of Inquiry (COl) dismissed the results of their own test which established conclusively that flooding at test-depth - the COI's assessed cause of the disaster - would have been a catastrophic
event and would not have been reported by THRESHER to her escort ship, the USS SKYLARK (ASR 20), at 0913R as experiencing minor difficulties. Multiple lines of evidence - discussed in detail by Chapter
1 of this assessment - confirm there was no flooding prior to collapse of the pressure-hull at great depth.
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