Accidents and system failures

The risk IDs on the matrix below are risks which sit under the theme 'accidents and system failures'. More information about the risks can be found below.

Impact	5	Civil nuclear accident 28 Radiation release from overseas nuclear site 29		Failure of the National Electricity Transmission System (NETS) 26A
	4	Aviation collision 21	Loss of Positioning, Navigation and Timing (PNT) services 24 Reservoir/dam collapse 38	Failure of gas supply infrastructure 27
	3	Large passenger vessel accident  17 Accidental fire or explosion at an onshore major hazard (COMAH) site 32 Accidental large toxic chemical release from an onshore major hazard (COMAH) site 33 Accidental fire or explosion on an offshore oil or gas installation 34 Accidental fire or explosion at an onshore fuel pipeline 35 Accidental fire or explosion at an onshore major accident hazard pipeline  36	Malicious drone incident 22 Disruption of space-based services 23	Simultaneous loss of all fixed and mobile forms of communication 25 Regional failure of the electricity network 26B Technological failure at a systemically important retail bank 31A	Food supply contamination 40	Technological failure at a UK critical financial market infrastructure 31B
	2	Major maritime pollution incident 18 Incident (grounding/sinking) of a vessel blocking a major port  19 Radiation exposure from transported, stolen or lost goods 30 Accidental work-related (laboratory) release of a hazardous pathogen 37 Water infrastructure failure or loss of drinking water 39	Rail accident  16 Major fire 41	Insolvency of supplier(s) of critical services to the public sector 14 Accident involving high consequence dangerous goods 20	Major adult social care provider failure 13
	1				Insolvency affecting fuel supply 15
		1	2	3	4	5
	Likelihood

Impact & Likelihood

Impact key

5	Catastrophic
4	Significant
3	Moderate
2	Limited
1	Minor

Likelihood key

5	>25%
4	5-25%
3	1-5%
2	0.2-1%
1	<0.2%

Risk scenarios

ID	Title	Publishing date
13	Major adult social care provider failure	July 2023
14	Insolvency of supplier(s) of critical services to the public sector	July 2023
15	Insolvency affecting fuel supply	July 2023
16	Rail accident	July 2023
17	Large passenger vessel accident	July 2023
18	Major maritime pollution incident	July 2023
19	Incident (grounding/sinking) of a vessel blocking a major port	July 2023
20	Accident involving high consequence dangerous goods	July 2023
21	Aviation collision	July 2023
22	Malicious drone incident	July 2023
23	Disruption of space-based services	July 2023
24	Loss of Positioning, Navigation and Timing (PNT) services	July 2023
25	Simultaneous loss of all fixed and mobile forms of communication	July 2023
26A	Failure of the National Electricity Transmission System (NETS)	July 2023
26B	Regional failure of the electricity network	July 2023
27	Failure of gas supply infrastructure	July 2023
28	Civil nuclear accident	July 2023
29	Radiation release from overseas nuclear site	July 2023
30	Radiation exposure from transported, stolen or lost goods	July 2023
31A	Technological failure at a systemically important retail bank	July 2023
31B	Technological failure at a UK critical financial market infrastructure	July 2023
32	Accidental fire or explosion at an onshore major hazard (COMAH) site	July 2023
33	Accidental large toxic chemical release from an onshore major hazard (COMAH) site	July 2023
34	Accidental fire or explosion on an offshore oil or gas installation	July 2023
35	Accidental fire or explosion at an onshore fuel pipeline	July 2023
36	Accidental fire or explosion at an onshore major accident hazard pipeline	July 2023
37	Accidental work-related (laboratory) release of a hazardous pathogen	July 2023
38	Reservoir/dam collapse	July 2023
39	Water infrastructure failure or loss of drinking water	July 2023
40	Food supply contamination	July 2023
41	Major fire	July 2023