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ProjTitle.icon Chapter 7: Response to Nuclear Security Event

Section 34: Licensee Responsibility to Nuclear Security Event

150. The licensee shall immediately report to the NRRC and competent security agencies any occur-rence of the following nuclear security events and any changes that may affect nuclear security related to nuclear facilities or transport of nuclear material as defined in the approved contingen-cy plan:

(a) Actual or attempted intrusion into the facility or into a limited access area, protected area, in-ner area, or vital area.

(b) Attempted or actual unauthorized removal, loss, or unauthorized movement of nuclear ma-terial, whether involving external adversaries or insiders.

(c) Attempted or actual acts of sabotage, including tampering or interference with vital area equipment, systems, or devices.

(d) Loss or unauthorized disclosure of sensitive information.

(e) Failure of any physical protection equipment and system leading to loss of physical protection system's function.

(f) Compromise or attempted compromise of digital computers, communication systems and networks used for nuclear security and safety.

(g) Any other event that could potentially compromise security measures.

151. The licensee shall assign a sufficient number of persons with expertise in nuclear safety, security, and radiation safety to assist the competent security agencies during a nuclear security event.

152. The licensee shall initiate its contingency plan after detection and assessment of any malicious act.

 Appendix 1 Categorization of Nuclear Material

MaterialFormCategory ICategory IICategory IIIc
1. Plutonium aUnirradiatedb2 kg or more

Less than 2 kg

but more than 500 g

500 g or less

but more than 15 g

2. Uranium-235 (235U)


– Uranium enriched to 20%

235U or more


5 kg or more


Less than 5 kg

but more than 1 kg


1 kg or less

but more than 15 g


– Uranium enriched to 10%

235U but less than 20% 235U

 10 kg or moreLess than 10 kg but more than 1 kg

– Uranium enriched above natural, but less than 10%


  10 kg or more
3. Uranium-233 (233U)Unirradiatedb2 kg or moreLess than 2 kg but   more than 500 g500 g or less but   more than 15 g

4. Irradiated fuel

(The NRRC may assign a different category for domestic use, storage and transport taking all relevant factors into account.)

  Depleted or natural uranium, thorium or low      enriched fuel (less than 10% fissile content)d, e 

Note: This table is not to be used or interpreted independently of the text of the entire publication.

a   All plutonium except that with isotopic concentration exceeding 80% in plutonium-238.

b   Material not irradiated in a reactor or material irradiated in a reactor but with a radiation level equal to or less than 1 Gy/h. (100 rad/h) at 1 m unshielded.

c Quantities not falling in Category III and natural uranium, depleted uranium and thorium should be protected at least in accordance with prudent management practice.

d Based on evaluation of the specific circumstances, the NRRC may  assign a different category of physical protection.

e Other fuel which by virtue of its original fissile material content is classified as Category I or II before irradiation may be reduced one category level while the radiation level from the fuel exceeds 1 Gy/h (100 rad/h) at one metre unshielded.​

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