Office for Nuclear Regulation

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Release of information under EIR 2004 about events at nuclear power stations and Aldermaston reported to us over the last five years

Following a request under the Freedom of Information Act 2000, ND released information concerning INES-rated events, together with an explanatory note. Following a subsequent and separate request for details of all incidents at nuclear power stations (NPS) and AWE Aldermaston reported to us over the last five years, we have released the following additional information, together with a further explanatory note. The release is made under the Environmental Information Regulations 2004.

Power station sites

Please note that in the case of nuclear power stations, the details of a very large proportion of such events have already been placed on our website. This was in response to another, earlier question regarding all civil sites, which include nuclear power stations and which was put to us under the Freedom of Information Act 2000:

Here you will find the requested event details, together with an explanation of their regulatory context, source and descriptions. The explanation also covers the International Nuclear and Radiological Event Scale (INES), as well as our Fast Stream reporting and event screening systems, which should help you to understand the following explanation of which events are included on the website and which are not.  

The events included on the website are those reported to us which have been rated by our civil nuclear licensees as level 0 or above on INES.  The website includes relevant details of all INES-rated Fast Stream event data for civil sites reported from 2001 to September 18, 2009, together with other civil INES-rated event data reported from 2007 to 11 August 2009.  However, as the associated explanation on our website makes clear, there are other event reports which were not relevant to the question asked of us and which consequently were not included in the listings.  Consequently, and in order to complete the picture of event reports in relation to your own request, we have a) gathered together the details of similar reports for nuclear power stations, in order to complete the INES-rated record for 2009, and b) added the details of other reports received from nuclear power stations which were not given an INES rating but which, after screening for their safety significance, we still consider to have been challenges to nuclear safety systems, albeit that very many were quite minor ones.  The resulting event details are included in the attached documents.  

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AWE Aldermaston

The Aldermaston fast stream reporting system is less mature than that for civil nuclear sites, but we are satisfied that the general notification arrangements meet the requirements of the relevant regulations.  We have provided information on events reported through the fast stream system supplemented by other available recorded events reported to us.

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General comments

Turning now to your request for details of events such as our response, action taken, length of fire etc.  Unfortunately, we are unable to respond to your request for further details because these are spread across our three operating divisions and their very many operational files.  At the moment, and in the absence of an appropriate database, each event would need to be followed up individually through the associated files for the particular site in question, which would take a considerable amount of time, given the number of events recorded.  Nevertheless, and in order to help you further, our consideration of any particular event reported can lead to a number of responses which range from noting the circumstances but taking no further action, in cases where an event is judged to be relatively trivial in its nature, through to following up the associated issues as part of either a planned or reactive intervention on site and ultimately, mounting a formal investigation if the safety significance or circumstances warrant one.  
 
It may help your understanding of our regulation further to know that our response to each and every event reported to us will depend on a number of factors, with each event being treated according to its own particular circumstances and details.  We strive to be both consistent and proportionate in all our responses to events and our processes for conducting our planned regulatory interventions is explained in our internal procedure INS/008 and its associated guidance document G/INS/008.

The same principles are maintained in our consideration of the need for enforcement action through our application of HSE's Enforcement Management Model to the particular event in question, as set out in NS-ENF-GD-002.

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NPS Other Screened Non INES-rated Reports 2007-2009

Event date Site Event description
1.1.99 Torness Non-compliance or inadequacy associated with arrangements made in the interests of safety
30.1.07 Hinkley Point B Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
2.2.07 Sizewell B Non-compliance with conditions and limits necessary in the interests of safety
12.3.07 Hinkley Point B Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
3.4.07 Hunterston B Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
17.4.07 Dungeness B Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
26.4.07 Oldbury Non-compliance or inadequacy associated with arrangements made in the interests of safety
28.4.07 Dungeness B External event (including those not on a licensed nuclear site)
1.5.07 Heysham 1 Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
21.5.07 Wylfa Safety-related plant defect or degradation
1.6.07 Hunterson B Automatic or manual reactor trip following plant anomaly
2.6.07 Dungeness B Non-compliance with conditions and limits necessary in the interests of safety
10.6.07 Hunterston B Automatic or manual reactor trip following plant anomaly
19.6.07 Heysham 2 Automatic or manual reactor trip following plant anomaly
8.7.07 Heysham 1 Safety-related plant defect or degradation
9.7.07 Hartlepool Non-compliance or inadequacy associated with arrangements made in the interests of safety
13.7.07 Hunterston B Automatic or manual reactor trip following plant anomaly
31.7.07 Torness Non-compliance with conditions and limits necessary in the interests of safety
23.8.07 Heysham 1 Automatic or manual reactor trip following plant anomaly
31.8.07 Wylfa Automatic or manual reactor trip following plant anomaly
5.9.07 Hartlepool Automatic or manual reactor trip following plant anomaly
9.9.07 Heysham 1 Non-compliance or inadequacy associated with arrangements made in the interests of safety
19.9.07 Wylfa Non-adherence to a safety-related procedure
19.9.07 Hartlepool Safety-related plant defect or degradation
25.9.07 Heysham 1 Smouldering / smoking material or fire
2.10.07 Torness  
3.10.07 Wylfa Automatic or manual reactor trip following plant anomaly
16.10.07 Torness Automatic or manual reactor trip following plant anomaly
20.10.07 Heysham 1 Automatic or manual reactor trip following plant anomaly
20.10.07 Torness Automatic or manual reactor trip following plant anomaly
15.11.07 Hinkley Point B Safety-related plant defect or degradation
15.11.07 Torness Automatic or manual reactor trip following plant anomaly
21.11.07 Dungeness B Non-compliance or inadequacy associated with arrangements made in the interests of safety
27.11.07 Hunterston B Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
27.11.07 Hunterston B Smouldering / smoking material or fire
5.12.07 Hunterston B Automatic or manual reactor trip following plant anomaly
26.12.07 Chapelcross External event (including those not on a licensed nuclear site)
30.4.08 Heysham 1 Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
21.5.08 Chapelcross Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
18.7.08 Trawsfynydd Radiation or contamination event affecting personnel
19.2.09 Hartlepool Automatic or manual reactor trip following plant anomaly
5.4.09 Heysham 1 Automatic or manual reactor trip following plant anomaly

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NPS FS Screened Non INES-rated Reports for 2005

Event Date Site Event description
4.2.05 Heysham 1 Smouldering / smoking material or fire
8.5.05 Dungeness A External event (including those not on a licensed nuclear site)
30.5.05 Heysham 1 Lifting event with nuclear safety implications
12.8.05 Chapelcross External event (including those not on a licensed nuclear site)
16.9.05 Torness Smouldering / smoking material or fire
6.10.05 Wylfa Flask or package movement or transport event
13.10.05 Chapelcross Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
24.10.05 Chapelcross Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
30.10.05 Dungeness A Automatic or manual reactor trip following plant anomaly

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NPS FS Screened Non INES-rated Reports for 2006

Event Date Site Event description
26.4.06 Dungeness A Automatic or manual reactor trip following plant anomaly
25.5.06 Torness Non-compliance or inadequacy associated with arrangements made in the interests of safety
30.5.06 Dungeness B Non-compliance with conditions and limits necessary in the interests of safety
1.6.06 Sizewell A Automatic or manual reactor trip following plant anomaly

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NPS FS Screened Non INES-rated Reports for 2007

Event Date Site Event description
26.3.07 Dungeness B Unplanned leak or spillage of contaminated or potentially contaminated coolant
26.3.07 Dungeness B Unplanned leak or spillage of contaminated or potentially contaminated coolant
27.4.07 Hinkley Point B Non-compliance or inadequacy associated with arrangements made in the interests of safety
27.4.07 Hinkley Point B Non-compliance or inadequacy associated with arrangements made in the interests of safety
2.6.07 Hunterston B Automatic or manual reactor trip following plant anomaly
19.6.07 Dungeness B Automatic or manual reactor trip following plant anomaly
20.6.07 Wylfa Automatic or manual reactor trip following plant anomaly
20.6.07 Oldbury Safety-related plant defect or degradation
20.6.07 Wylfa Automatic or manual reactor trip following plant anomaly
20.6.07 Oldbury Safety-related plant defect or degradation
13.9.07 Berkeley Non-adherence to a safety-related procedure
13.9.07 Berkeley Non-adherence to a safety-related procedure

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NPS FS Screened Non INES-rated Reports for 2008

Event date Site Event description
23.1.08 Wylfa Non-compliance or inadequacy associated with arrangements made in the interests of safety
31.1.08 Wylfa Lifting event with nuclear safety implications
7.2.08 Oldbury Safety-related plant defect or degradation
12.3.08 Wylfa Safety-related plant defect or degradation
1.4.08 Wylfa Non-compliance or inadequacy associated with arrangements made in the interests of safety
22.4.08 Heysham 1 Lifting event with nuclear safety implications
12.6.08 Hinkley Point B Safety-related plant defect or degradation
20.6.08 Hartlepool Non-adherence to a safety-related procedure
7.8.08 Wylfa Safety-related plant defect or degradation
23.8.08 Wylfa Automatic or manual reactor trip following plant anomaly
14.10.08 Hinkley Point B Conventional safety event
5.11.08 Wylfa Smouldering / smoking material or fire

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NPS FS Screened Non INES-rated Reports for 2009

Event Date Site Event description
12.3.09 Heysham 1 Smouldering / smoking material or fire
20.3.09 Hunterston B Smouldering / smoking material or fire
7.5.09 Heysham 2 Safety-related plant defect or degradation
15.7.09 Heysham 2 Non-adherence to a safety-related procedure
10.9.09 Hartlepool Automatic or manual reactor trip following plant anomaly
12.9.09 Heysham 2 Conventional safety event
12.9.09 Heysham 2 Conventional safety event
14.10.09 Heysham 2 Lifting event with nuclear safety implications

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NPS INES-rated Fast Stream Reports for 2009 from 19 Sept

Event Date Site INES Rating Event description
19.9.09 Sizewell B 0 Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
28.9.09 Heysham 2 0 Automatic or manual reactor trip following plant anomaly
30.9.09 Hartlepool 0 Lifting event with nuclear safety implications
20.10.09 Dungeness B 0 Environment event regulated by the Environment Agency or the Scottish Environment Protection Agency
30.10.09 Hinkley Point B 0 Automatic or manual reactor trip following plant anomaly
2.11.09 Hartlepool 0 Non-compliance with conditions and limits necessary in the interests of safety
7.11.09 Hunterston B 0 Non-compliance with conditions and limits necessary in the interests of safety
8.11.09 Hinkley Point B 0 Non-compliance with conditions and limits necessary in the interests of safety
11.11.09 Sizewell B 0 Automatic or manual reactor trip following plant anomaly
16.11.09 Hinkley Point B 0 External event (including those not on a licensed nuclear site)
23.11.09 Dungeness B 1 Smouldering / smoking material or fire
25.11.09 Heysham 1 0 Conventional safety event
6.12.09 Wylfa 0 Unplanned leak or spillage of active or potentially active process liquor or material
11.12.09 Heysham 1 0 Smouldering / smoking material or fire
21.12.09 Heysham 1 0 Unplanned leak or spillage of contaminated or potentially contaminated coolant
21.12.09 Sizewell A 0 Conventional safety event
24.12.2009 Sizewell A 0 External event (including those not on a licensed nuclear site)

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NPS Other INES-rated Reports for 2009 from 12 Aug

Event date Site INES Rating Event description
28.8.09 Hartlepool 0 Smouldering / smoking material or fire
10.9.09 Hinkley Point B 0 Lifting event with nuclear safety implications
12.9.09 Heysham 1 0 Non-adherence to a safety-related procedure
1.10.09 Hinkley Point B 0 Automatic or manual reactor trip following plant anomaly
10.10.09 Hartlepool 0 Automatic or manual reactor trip following plant anomaly
18.10.09 Hartlepool 0 Automatic or manual reactor trip following plant anomaly
24.12.09 Heysham 1 0 Radiation or contamination event affecting personnel

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AWE Reports for 2005-09

Event date Site Event description
23.8.05 Aldermaston Unplanned leak or spillage of active or potentially active process liquor or material
29.6.06 Aldermaston Smouldering/smoking material or fire
3.1.07 Aldermaston Non-compliance with conditions and limits necessary in the interests of safety
4.1.07 Aldermaston Conventional safety event
4.1.07 Aldermaston Conventional safety event
9.5.07 Aldermaston Safety-related plant defect or degradation
18.5.07 Aldermaston Media interest only
21.8.07 Aldermaston Radiation or contamination event affecting personnel
12.9.07 Aldermaston Non-compliance with conditions and limits necessary in the interests of safety
21.11.07 Aldermaston Safety-related plant requirement incorrectly implemented
10.1.08 Aldermaston Non-compliance with conditions and limits necessary in the interests of safety
21.2.08 Aldermaston Non-compliance with conditions and limits necessary in the interests of safety
23.4.08 Aldermaston Safety-related plant defect or degradation
25.9.08 Aldermaston Radiation or contamination event affecting personnel
29.9.08 Aldermaston Non-compliance or inadequacy associated with arrangements made in the interests of safety
8.10.08 Aldermaston Radiation or contamination event affecting personnel
20.10.08 Aldermaston Safety-related plant requirement incorrectly implemented
27.11.08 Aldermaston Safety-related plant defect or degradation
3.12.08 Aldermaston Safety-related plant requirement incorrectly implemented
11.12.08 Aldermaston Safety-related plant defect or degradation
21.2.09 Aldermaston Safety-related plant requirement incorrectly implemented
9.3.09 Aldermaston Smouldering/smoking material or fire
19.3.09 Aldermaston Smouldering/smoking material or fire
3.4.09 Aldermaston Radiation or contamination event affecting personnel
13.5.09 Aldermaston Conventional safety event
29.6.09 Aldermaston Unplanned leak or spillage of active or potentially active process liquor or material
15.10.09 Aldermaston Safety-related plant defect or degradation
23.10.09 Aldermaston Unplanned leak or spillage of active or potentially active process liquor or material

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