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3 — Each State Party may at the time of signature, ratification, acceptance or approval of this Convention or accession thereto declare that it does not consider itself bound by either or both of the dispute settlement procedures provided for in paragraph 2. The other States Parties shall not be bound by a dispute settlement procedure provided for in paragraph 2, with respect to a State Party which has made a reservation to that procedure.

4 — Any State Party which has made a reservation in accordance with paragraph 3 may at any time withdraw that reservation by notification to the depositary.

Article 18

1 — This Convention shall be open for signature by all States at the headquarters of the International Atomic Energy Agency in Vienna and at the headquarters of the United Nations in New York from 3 March 1980 until its entry into force.

2 — This Convention is subject to ratification, acceptance or approval by the signatory States.

3 — After its entry into force, this Convention will be open for accession by all States.

4:

a) This Convention shall be open for signature or accesion by international organizations and regional organizations of an integration or other nature, provided that any such organization is constituted by sovereign States and has competence in respect of the negotiation, conclusion and application of international agreements in matters covered by this Convention;

b) In matters within their competence, such organizations shall, on their own behalf, exercise the rights and fulfil the responsabilities which this Convention attributes to States Parties;

c) When becoming party to this Convention, such an organization shall communicate to the depositary a declaration indicating which States are members thereof and which articles of this Convention do not apply to it;

d) Such an organization shall not hold any vote additional to those of its Member States.

5 — Instruments of ratification, acceptance, approval or accession shall be deposited with the depositary.

Article 19

1 — This Convention shall enter into force on the thirtieth day following the date of deposit of the twenty-first instrument of ratification, acceptance or approval with the depositary.

2 — For each State ratifying, accepting, approving or acceding to the Convention after the date of deposit of the twenty-first instrument of ratification, acceptance or approval, the Convention shall enter into force on the thirtieth day after the deposit by such State of ist instrument of ratification, acceptance, approval or accession.

Article 20

1 — Without prejudice to article 16, a State Party may propose amendments to this Convention. The proposed amendment shall be submitted to the depositary who shall circulate it immediately to all States Parties.

If a majority of States Parties request the depositary to convene a conference to consider the proposed amendments, the depositary shall invite all States Parties to attend such a conference to begin not sooner than thirty days after the invitations are issued. Any amendment adopted at the conference by a two-thirds majority of all States Parties shall be promptly circulated by the depositary to all States Parties.

2 — The amendment shall enter into force for each State Party that deposits its instrument of ratification, acceptance or approval of the amendment on thirtieth day after the date on which two-thirds of the States Parties have deposited their instruments of ratification, acceptance or approval with the depositary. Thereafter, the amendment shall enter into force for any other State Party on the day on which that State Party deposits its instrument of ratification, acceptance or approval of the amendment.

Article 21

1 — Any State Party may denounce this Convention by written notification to the depositary.

2 — Denunciation shall take effect one hundred and eighty days following the date on which notification is received by the depositary.

Article 22

The depositary shall promptly notify all States of:

a) Each signature of this Convention;

b) Each deposit of an instrument of ratification, acceptance, approval or acession;

c) Any reservation or withdrawal in accordance with article 17;

d) Any communication made by an organization in accordance with paragraph 4, c), of article 18;

e) The entry into force of this Convention;

f) The entry into force of any amendment to this Convention; and

g) Any denunciation made under article 21.

Article 23

The original of this Convention, of which the Arabic, Chinese, English, French, Russian and Spanish texts are equally authentic, shall be deposited with the director-general of the International Atomic Energy Agency, who shall send certifed copies thereof to all States.

In witness whereof, the undersigned, being duly authorized, have signed this Convention, opened for signature at Vienna and at New York on 3 March 1980.

ANNEX I

Levels of physical protection to be applied in International transport of nuclear material as categorized In annex n

1 — Levels of physical protection for nuclear material during storage incidental to international nuclear transport include:

a) For category in materials, storage within an area to which access is controlled;

b) For category n materials, storage within an area under constant surveillance by guards of electronic devices, surrounded by a physical