ONR Response to a Class 5 (other nuclear) Event - HSE

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Office for Nuclear Regulation
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ONR INSTRUCTION
ONR Response to a Class 5 (other nuclear) Event
Document Type:
Emergency Arrangements Instruction
Unique Document ID and
Revision No:
ONR-EP-IN-008 Revision 4
Date Issued: July 2013 Review Date: July 2016
Approved by: David Senior HM Deputy Chief Inspector
Record Reference: Trim Folder 4.10.3.160. (2013/280784)
Revision commentary:
Routine Update
TABLE OF CONTENTS
1. INTRODUCTION...................................................................................................................... 2
2. PURPOSE AND SCOPE.......................................................................................................... 2
3. RESPONSIBILITIES ................................................................................................................2
4. DEFINITIONS .......................................................................................................................... 2
5. PROCEDURE .......................................................................................................................... 2
6. ASSOCIATED DOCUMENTS .................................................................................................. 3
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ONR-EP-IN-008 Revision 4 Page 1 of 3

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1. INTRODUCTION
1.1. ONR does not have regulatory or primary advisory role in an emergency response to
nuclear events which do not fall into any of the six main categories in ONR's emergency
arrangements (defined in ONR-EP-IN-002 as Class 1 (Civil), Class 1 (MOD), Class 2, Class
3, Class 4, and Class 6), with the exception of emergencies involving the transport of
radioactive materials (both nuclear and non-nuclear) within the UK, which is regulated by
the ONR Radioactive Materials Transport (RMT) Team. However, ONR may be alerted to
such nuclear events and be required to: redirect alerting calls to the appropriate regulatory
or responsible authority; and provide advice.
2. PURPOSE AND SCOPE
2.1. This document defines the procedure that ONR will follow in responding to nuclear events
which do not fall into any of the six main categories in ONR's emergency arrangements - a
Class 5 Event.
3. RESPONSIBILITIES
3.1. The Nominated Inspector is responsible for redirecting any alerting call to the appropriate
regulatory or responsible authority, and consulting with the Chief Inspector (CI) or Deputy
Chief Inspector (DCI) over any request for advice.
4. DEFINITIONS
4.1. Class 5 Event: An other nuclear event, defined as:
Any nuclear event involving the release of radioactivity (or the potential for release) which is
not covered by the other classes defined in ONR-EP-IN-002. The following are specifically
included:
1. events falling within the National Arrangements of Incidents involving Radioactivity
NAIR scheme (NAIR is a scheme for responding to events involving radioactive
materials, e.g. spills in transit or discovery of sources or containers in a public
place);
2. road or rail transport events (other than flasks containing irradiated fuel) including
those falling within the RADSAFE scheme;
3. air transport events;
4. sea transport events; and
5. unplanned re-entry of satellites containing radioactivity.
5. PROCEDURE
5.1. This procedure applies when, after following ONR-EP-IN-002 Emergency Arrangements –
Initial Notification and Event Classification (Ref 6.1), the Nominated Inspector determines
that a Class 5 event is ongoing.
5.2. If the caller is seeking to alert the authorities to a nuclear event in this class, the Nominated
Inspector should advise them that, with the exception of events involving the transport of
ONR-EP-IN-008 Revision 4 Page 2 of 3

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Office for Nuclear Regulation
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radioactive materials, ONR has no regulatory or primary advisory role in an emergency
response to events of this type. The Nominated Inspector should redirect callers as follows:
1. Returning satellites – redirect the caller to the Home Office.
2. All types of rail, road, air or sea transport event not involving irradiated fuel - redirect
the caller to the ONR RMT Team.
3. All other UK incidents which fall within the NAIR scheme - redirect the caller to the
Police Force HQ for the location.
4. A call alerting the UK Government to a nuclear event on an overseas installation -
redirect the caller to DECC.
5. If the caller is seeking advice from ONR, the Nominated Inspector should consult
with the CI or DCI and carry out any agreed actions.
6. ASSOCIATED DOCUMENTS
6.1. ONR-EP-IN-002 – Initial Notification and Event Classification.
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