International Atomic Energy Agency
(Unofficial electronic edition)
9 April 1964
The Agency's Safeguards
Extension of the system to large reactor
On 26 February 1964 the Board of Governors approved provisions
to extend the Agency's safeguards system to make it relate to
reactors of 100 or more thermal megawatts, notwithstanding the
limitations specified in paragraph 4 of document INFCIRC/26.
The present document sets forth these provisions for the
information of all Members.
Agency Safeguards Relating to Large Reactor Facilities
- A. Introduction
- The safeguards provisions set forth in document INFCIRC/26
(hereinafter referred to as the "principal safeguards
document"), except those in sections V.B and C thereof and as
otherwise specified herein, will also apply to reactors of 100
or more thermal megawatts and to the source and special
fissionable material used or produced in them. The following
additional provisions relate to reactor facilities of 100 or
more thermal megawatts and also to other reactor facilities to
which the table in paragraph 65 of the principal safeguards
document does not extend (together hereinafter referred to as
"large reactor facilities").
- B. Attachment to special fissionable materials produced in
large reactor facilities
- The provisions for the attachment of safeguards contained
in the principal safeguards document and in paragraph 3 below
will relate to all generations of special fissionable material
derived from special fissionable material produced in a large
reactor facility, notwithstanding any provision to the
contrary in that document. The procedures of application will
be in accordance with the safeguards procedures in effect at
the time of such application.
- With respect to a large reactor facility to which Agency
safeguards are not attached, Agency safeguards will be
attached at least to such fraction of the special fissionable
material produced in the reactor as is equal to the ratio of
the fissionable isotopes ("fissionable isotopes" means the
isotopes uranium-233, uranium-235 and plutonium-239) within
the nuclear material to which
Agency safeguards are attached to all fissionable isotopes in
the reactor. If this ratio is greater than 0.3, safeguards
will be attached to all such material produced in the reactor.
The ratio will be calculated on the basis of estimated average
values for the period specified in the appropriate agreement.
(This paragraph constitutes an interpretation of paragraph 35
of the principal safeguards document).
- C. Procedures to supplement those in section V.A of the
principal safeguards document
a. Routine reports
- The required frequency of routine reports for a large
reactor facility shall not exceed twelve a year.
- If requested, the State shall make available to the Agency
progress reports on the construction of a large reactor
facility, starting when construction has reached an advanced
stage as specified in the appropriate agreement. These
reports shall provide such information on the current
condition of the facility as is relevant to the application of
safeguards, and a forecast of the further work planned for the
following four-month period. Not more than four such reports
shall be required annually.
b. Frequency of routine inspections
- The maximum frequency of routine inspections during and
after the construction of a large reactor facility shall be as
shown in or as obtained by extrapolation from the table in
paragraph 65 of the principal safeguards document. If such
extrapolation indicates a frequency in excess of twelve per
year, the Agency's inspectors shall have access to the
facility at all times. In determining the inspection
requirements for a particular facility, due account shall be
taken of paragraphs 63 and 64, and of the considerations in
subparagraphs (a) to (d) of paragraph 65, of the principal