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Dungeness B nuclear station – safety problems, reactors still shut down

IAEA 17th Jan 2019 , In September 2018, as part of a regulatory intervention on external
corrosion management, the UK nuclear safety regulator (Office for Nuclear
Regulation (ONR)) issued a direction for Dungeness B nuclear power station
to carry out a review and reassessment of safety addressing the corrosion
of concealed systems that fulfil a safety function.

Inspections carried out by the site nuclear licence holder (licensee) in response to this direction
identified that seismic restraints, pipework and storage vessels associated
with several systems providing a safety function were found to be corroded
to an unacceptable condition. This condition would have been present whilst
the reactor was at power, although, the affected systems were not called
upon to perform their safety function. Rectification of the degradation has
now been undertaken whilst the units have been shut down for maintenance.

The rectification work required more than 300m of pipework associated with
reactor cooling systems to be renewed, along with renewal of numerous
seismic pipework supports and remediation of carbon dioxide storage
vessels.

Both reactors at Dungeness B are currently (January 2019) shutdown
as part of the licensees ongoing recovery program. The licensee has
identified a number of additional commitments that will be fulfilled prior
to returning either reactor to service. ONR continues to engage with the
licensee to monitor progress against commitments. The licensee has an
on-going investigation underway to establish the causes of this issue.
https://www-news.iaea.org/ErfView.aspx?mId=6033b140-6500-4900-a8bb-6bdb9f347c94

I

January 19, 2019 - Posted by Christina Macpherson | safety, UK

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