Nuclear aircraft carrier USS Nimitz appears in Rio de Janeiro and causes the Navy to activate a radiological operation full of protocols in Guanabara Bay.

Written by Caio Aviz

Published on 09/05/2026 at 19:26

Updated on 09/05/2026 at 19:27

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Operation with air measurements, water collection, marine soil analysis, and continuous monitoring reinforces Brazilian nuclear safety, radiological protection, and environmental preservation protocols during the passage of the aircraft carrier USS Nimitz through Guanabara Bay, in Rio de Janeiro

The passage of the American aircraft carrier USS Nimitz through Guanabara Bay, in Rio de Janeiro, mobilized a technical radiological monitoring operation conducted by the Brazilian Navy.

The action was monitored by the Naval Secretariat for Nuclear Safety and Quality, the body responsible for naval nuclear regulation and inspection in the country.

Furthermore, the work was carried out in partnership with the Institute of Radiation Protection and Dosimetry, linked to the National Nuclear Safety Authority.

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Technical monitoring began before anchoring

According to the Brazilian Navy, the monitoring process began even before the USS Nimitz anchored in Guanabara Bay.

Also, activities are expected to continue until one day after the vessel’s departure from the site.

***Image – Brazilian Navy News Agency***

During the operation, specialized teams carried out air dose rate measurements at strategic points.

Furthermore, environmental samples of surface water and seabed soil were collected.

These points included areas of crew circulation, embarkation, and disembarkation, where continuous monitoring of radiological conditions took place.

Military and civil institutions worked together

Sample collection was carried out by the 2nd Nuclear, Biological, Chemical, and Radiological Protection and Defense Battalion of the Marine Corps.

Laboratory analysis, meanwhile, was the responsibility of the Institute of Radiation Protection and Dosimetry.

Thus, the operation brought together military and civil structures in an integrated action of control, inspection, and security.

According to Corvette Captain Marcos William Magalhães Leiras de Carvalho, head of the Radiological Protection Department at SecNSNQ, the activities followed the protocols defined by the agency.

For him, this set of collections is essential to confirm that the environment remains safe.

Nuclear safety was the focus of the operation

In addition to environmental monitoring, the visit of the USS Nimitz also allowed demonstrating how the Brazilian control system for vessels with onboard nuclear reactors works.

Therefore, the action strengthened the national response capability in events involving nuclear-powered naval assets.

The operation also highlighted the importance of coordination between defense, science, and environmental protection.

In this context, the work of the Navy, SecNSNQ, IRD, and ANSN demonstrated Brazil’s technical preparedness for situations of high technological complexity.

Guanabara Bay received continuous monitoring

While the aircraft carrier remained in the region, the teams continuously monitored radiological conditions in previously defined areas.

Samples collected from the water and seabed will still be sent for laboratory analysis.

Nevertheless, the operation has already reinforced the application of Brazilian naval nuclear safety protocols.

Thus, the passage of the USS Nimitz through Guanabara Bay was not just a military visit.

It also showed how Brazil tracks, inspects, and monitors large vessels with onboard nuclear technology.

Ultimately, in a scenario of increasingly advanced vessels, how should Brazil expand its nuclear and environmental safety protocols?

Nuclear aircraft carrier USS Nimitz appears in Rio de Janeiro and causes the Navy to activate a radiological operation full of protocols in Guanabara Bay.

Operation with air measurements, water collection, marine soil analysis, and continuous monitoring reinforces Brazilian nuclear safety, radiological protection, and environmental preservation protocols during the passage of the aircraft carrier USS Nimitz through Guanabara Bay, in Rio de Janeiro

Technical monitoring began before anchoring

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Nuclear aircraft carrier USS Nimitz appears in Rio de Janeiro and causes the Navy to activate a radiological operation full of protocols in Guanabara Bay.

Operation with air measurements, water collection, marine soil analysis, and continuous monitoring reinforces Brazilian nuclear safety, radiological protection, and environmental preservation protocols during the passage of the aircraft carrier USS Nimitz through Guanabara Bay, in Rio de Janeiro

Technical monitoring began before anchoring

Turkey prepares “billion-dollar shortcut” in the Black Sea to relieve the Bosphorus and change the logic of global maritime routes amid tensions in the Strait of Hormuz

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Guanabara Bay received continuous monitoring

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