Hydrogen release from gas storage in a nuclear power plant

A hydrogen leak occurs at a gas cylinder storage tank park in a nuclear power plant.
Employees locate the origin of the leak on a defective pressure regulator. They isolate the hydrogen release and secure the park.
10 m³ of gas, the equivalent of one and a half cylinders, escaped.

INITIATING cause was the failure of a pressure regulator

hydrogen cylinders, pressure regulator

10 m3 oh hydrogen released to the environment

Following the automatic alarm (probably given by a hydrogen detector) the hydrogen release location was isolated.

The ARIA report does not mention the corrective actions undertaken. The system preventing/mitigation system seemed have worked as designed.
To prevent in an absolute way this type of releases, a better (e.g. more frequent) maintenance and replacement scheme is probably needed.