Critical (Sub-Critical) Facilities - Design Information

CRITICAL (SUB-CRITICAL) FACILITIES
APPROVED BY OMB: NO. 3150-0056

EXPIRES: (MM/DD/YYYY)

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INTERNATIONAL ATOMIC ENERGY AGENCY
DEPARTMENT OF SAFEGUARDS

DESIGN INFORMATION
QUESTIONNAIRE *
IAEA USE ONLY

The purpose of this document is to
obtain the facility design information
required by the Agency in order to
discharge its safeguards responsibilities.
It will also serve as a checklist for
examination of design information by
Agency inspector(s). If, in any area,
insufficient space is available add further
shee ts to the extent necessary.

IAEA USE ONLY
COUNTRY

COUNTRY OFFICER

TYPE

DATE OF INITIAL DATA

VERIFICATION

LAST REVIEW AND UPDATING

N-93 (MM-DD-YYYY)

Critical (sub-critical) facilities

ALL FACILITIES
GENERAL INFORMATION
1. Name of the facility
(include usual abbreviation)
2. Location and postal
address
3. Owner
(Legally responsible)
4. Operator
(Legally responsible)

5. Description
(Main features only)

6. Purpose

7. Status
(e.g., planned; under construction,
in operation; shut down; closed
down; decommissioned)
Start of Construction (MM/DD/YYYY)

Commissioning (MM/DD/YYYY)

8. Construction schedule dates
(if not in operation)
9. Normal operating mode
(days only, two shift, three shift;
number of days/annum, etc.)
10. Facility layout
(structural containment, fences,
access, nuclear material storage
areas, laboratories, waste disposal
areas, routes followed by nuclear
material, experimental and test areas,
etc.)

DRAWING(S) ATTACHED UNDER REF. NOs.

DRAWING(S) AND/OR MAPS ATTACHED UNDER REF. NOs.
11. Sitting of facility
(Maps showing in sufficient detail:
location, premises and perimeter of
facility, other buildings, roads, railways,
rivers, etc.)

12. Names and/or titles and address
of responsible officers
(for nuclear material accountancy and
control and contact with the Agency. If
possible attach organization charts
showing position of officers)

N-93 (MM-DD-YYYY)

Operation (MM/DD/YYYY)

GENERAL STORAGE DATA
13. Number of critical assemblies in
the facility and their location

DIAGRAM(S) ATTACHED UNDER REF. NOs.)

14. Expected maximum operating
power
15. (1) Moderator
(2) Reflector
(3) Blanket
(4) Coolant
(5) Important items of
equipment which use, produce
or process nuclear material

NUCLEAR MATERIAL DESCRIPTION
16. Main types of nuclear material/
fuel and nominal weight of nuclear
material in the facility
17. Fuel enrichment range and Pu
content
18. Description of fuel elements
(For each type)
• physical and chemical form of fuel;
• geometrical form or type;
• dimensions;
• number of slugs per element;
• nuclear material and fissionable
material and its quantity (with design
tolerance);
• composition of alloy, etc.
19. Cladding Material
• thickness;
• composition of material;
• bonding
20. Sub-assemblies of fuel
(number of fuel elements per nuclear
assembly, arrangement of fuel
elements in sub-assembly,
configuration and nominal weight of
nuclear material per sub-assembly
[with design tolerance])

DRAWING(S) ATTACHED UNDER REF. NOs.

DRAWING(S) ATTACHED UNDER REF. NOs.
21. Basic operational accounting
unit (fuel elements/assemblies, etc.)

22. Other types of units
23. Means of nuclear material/fuel
identification

N-93 (MM-DD-YYYY)

NUCLEAR MATERIAL DESCRIPTION
24. Other nuclear materialin the
facility (each separately identified)

DRAWING(S) ATTACHED UNDER REF. NOs.
25. Core diagram
(for each critical assembly showing the
general disposition, core support
structure, shielding and heat removal
arrangements, channels for fuel
elements or sub-assemblies, control
rods, moderator, reflector, beam tubes,
dimensions, etc.)
26. Ranges of critical mass and
maximum radius

DRAWING(S) ATTACHED UNDER REF. NOs.
27. Description of most common
configurations

28. Average mean neutron flux in
the core
Thermal:
Fast:
29. Instrumentation for measuring
neutron and gamma flux:
• accuracy and type of principal
instruments
• location of indicator and recorder
RADIATION LEVEL DIAGRAM(S) ATTACHED UNDER REF. NOs.
30. Radiation level outside/inside
shielding at specified places

31. Maximum radiation activity of
fuel after refueling
(at the surface and at a distance of 1
metre)
32. Schematic flowsheet for
nuclear material
(identification of:
• measurement points;
• accountability areas:
• inventory location, etc
for operator purposes)
33. Inventory
State quantity range and approximate
uranium enrichment and plutonium
content for:
i)

Nuclear material storage(s)

N-93 (MM-DD-YYYY)

FLOWSHEET(S) FOR NORMAL OPERATION ATTACHED UNDER REF. NOs.

NUCLEAR MATERIAL DESCRIPTION
ii) Core area(s)

iii) Assembly core(s) itself

iv) Other locations
34. Nuclear material
i) Packaging (description)

DRAWING(S) ATTACHED UNDER REF. NOs.
ii) Storage plan and arrangements

iii) Capacity of storage

iv) Nuclear material preparation
(description and identification of layout
and general arrangement)

DRAWING(S) ATTACHED UNDER REF. NOs.
35. Fuel transfer equipment, if any

DRAWING(S) ATTACHED UNDER REF. NOs.
36. Routes followed by the nuclear
material

37. Main equipment used for
i) Nuclear material assembling

ii) Nuclear material testing

iii) Nuclear material measuring

PROTECTION AND SAFETY MEASURES
38. Basic measures for physical
protection of nuclear material

39. Specific health and safety rules
for inspector compliance
(If extensive, attach separately)

N-93 (MM-DD-YYYY)

NUCLEAR MATERIAL ACCOUNTANCY AND CONTROL
40. System description
give description of:
• the nuclear material accountancy
system;
• the method of recording and reporting
accountancy data;
• the procedures for account
adjustment after inventory and
correction of mistakes, etc.

SPECIMEN FORMS USED IN ALL PROCEDURES ATTACHED UNDER REF. No.

under the following headings:

i) General

ii) Receipts

iii) Shipments

iv) Physical inventory
Description of procedures, scheduled
frequency, methods of operator's
inventory taking (both for item and/or
bulk accountancy), including relevant
assay methods and expected
accuracy, access to nuclear material,
methods of verification of nuclear
material in the core

LIST OF MAJOR ITEMS OF EQUIPMENT REGARDED AS NUCLEAR MATERIAL CONTAINERS
ATTACHED UNDER REF. NOs.

v) Operational records and accounting
records
(including method of adjustment or
correction and place of preservation
and language)

41. How often is core disassembled
to permit the verification of
contained nuclear material
42. Features related to containment
and surveillance measures
(general description of applied or
possible measures)

43. For each measurement point of
accountability areas identified
under Qs. 32, Give the following:
For each measurement point fill in
separate sheet.
Number of measurement points: 1
i) Description of location, type
identification

N-93 (MM-DD-YYYY)

SEPARATE SHEET(S) CAN BE ATTACHED FOR EACH MEASUREMENT POINT IF NECESSARY,
ATTACH DRAWING(S)

NUCLEAR MATERIAL ACCOUNTANCY AND CONTROL
ii) Anticipated types of inventory
change and possibilities to use this
measurement point for physical
inventory taking
iii) Physical and chemical form of
nuclear material
(with cladding materials description)
IF NECESSARY, ATTACH DRAWING(S)
iv) Nuclear material containers,
packaging
v) Sampling procedure and
equipment used
vi) Measurement method(s) and
equipment used
vii) Source and level of random and
systematic errors
(measurements)
viii) Technique and frequency of
calibration of equipment used
ix) Method of converting source data
to batch data

x) Means of batch identification

xi) Anticipated batch flow rate per year

xii) Anticipated number of items per
flow and inventory batch

xiii) Type, composition and quantity of
nuclear material per batch (with
indication of batch data, total weight of
nuclear material in item, and the
isotopic composition (for uranium), and
Pu content, when appropriate; form of
nuclear material)

xiv) Features related to containmentsurveillance measures

N-93 (MM-DD-YYYY)

POST-OPERATION INFORMATION
End of operations (MM/DD/YYYY)

44. Decommissioning
schedule dates
PLAN(s) ATTACHED UNDER REF. NOs
45. Facility decommissioning
plan

i) Key events of the
decommissioning plan

ii) Removal and recovery of
nuclear material

iii) Removing or rendering inoperable
of essential equipment

OPTIONAL INFORMATION
46. Optional information
(that the operator considers relevant to
safeguarding the facility)
Signature of Responsible Officer

Date (MM/DD/YYYY)

N-93 (MM-DD-YYYY)

Decommissioned (MM/DD/YYYY)