INTERNATIONAL ATOMIC ENERGY AGENCY 

DEPARTMENT OF SAFEGUARDS

DESIGN INFORMATION 

QUESTIONNAIRE *

IAEA USE ONLY

N-93 (11-2020)

CRITICAL (SUB-CRITICAL) FACILITIES

APPROVED BY OMB: NO. 3150-0056 EXPIRES: 11/30/2023

Estimated burden per response to comply with this mandatory collection request: 360 hours. NRC is 

required to collect this information for reporting to IAEA from facility licensees appearing on the U.S. 

Eligible List. Send comments regarding burden estimate to the FOIA, Library, and Information 

Collections Branch (T-6 A10M), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, 

or by e-mail to Infocollects.Resource@nrc.gov, and the OMB reviewer at: OMB Office of Information 

and Regulatory Affairs, (3150-0056), Attn: Desk Officer for the Nuclear Regulatory Commission, 725 

17th Street NW, Washington, DC 20503; e-mail: oira_submission@omb.eop.gov. The NRC may 

not conduct or sponsor, and a person is not required to respond to, a collection of information unless 

the document requesting or requiring the collection displays a currently valid OMB control number.

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.

TYPE

IAEA USE ONLY 

COUNTRY 

COUNTRY OFFICER

DATE OF INITIAL DATA

VERIFICATION

LAST REVIEW AND UPDATING

Critical (sub-critical) facilities
N-93 (11-2020)

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)

8. Construction schedule dates 

(if not in operation) 

Start of Construction (MM/DD/YYYY) Commissioning (MM/DD/YYYY) Operation (MM/DD/YYYY)

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.

11. Sitting of facility 

(Maps showing in sufficient detail: 

location, premises and perimeter of 

facility, other buildings, roads, railways, 

rivers, etc.) 

DRAWING(S) AND/OR MAPS ATTACHED UNDER REF. NOs.

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) 
GENERAL STORAGE DATA

13. Number of critical assemblies in 

the facility and their location 

DIAGRAM(S) ATTACHED UNDER REF. NOs.)

N-93 (11-2020)

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

16. Main types of nuclear material/ 

fuel and nominal weight of nuclear 

material in the facility

NUCLEAR MATERIAL DESCRIPTION

17. Fuel enrichment range and Pu 

content

19. Cladding Material 

• thickness; 

• composition of material; 

• bonding

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.

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 (11-2020)

NUCLEAR MATERIAL DESCRIPTION

DRAWING(S) ATTACHED UNDER REF. NOs.

24. Other nuclear materialin the 

facility (each separately identified)

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.)

DRAWING(S) ATTACHED UNDER REF. NOs.

26. Ranges of critical mass and 

maximum radius

27. Description of most common 

configurations

30. Radiation level outside/inside 

shielding at specified places

RADIATION LEVEL DIAGRAM(S) ATTACHED UNDER REF. NOs.

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

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)

FLOWSHEET(S) FOR NORMAL OPERATION ATTACHED UNDER REF. NOs.
N-93 (11-2020)

ii) Storage plan and arrangements

34. Nuclear material

NUCLEAR MATERIAL DESCRIPTION

ii) Core area(s)

iii) Assembly core(s) itself

iv) Other locations

DRAWING(S) ATTACHED UNDER REF. NOs.

i) Packaging (description)

iii) Capacity of storage

iv) Nuclear material preparation 

(description and identification of layout 

and general arrangement)

35. Fuel transfer equipment, if any

DRAWING(S) ATTACHED UNDER REF. NOs.

36. Routes followed by the nuclear 

material

DRAWING(S) ATTACHED UNDER REF. NOs.

37. Main equipment used for 

i) Nuclear material assembling

ii) Nuclear material testing

iii) Nuclear material measuring

38. Basic measures for physical 

protection of nuclear material

PROTECTION AND SAFETY MEASURES

39. Specific health and safety rules 

for inspector compliance 

(If extensive, attach separately)
N-93 (11-2020)

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 

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

v) Operational records and accounting 

records 

(including method of adjustment or 

correction and place of preservation 

and language) 

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. 

under the following headings:

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

i) General

NUCLEAR MATERIAL ACCOUNTANCY AND CONTROL

ii) Receipts

LIST OF MAJOR ITEMS OF EQUIPMENT REGARDED AS NUCLEAR MATERIAL CONTAINERS 

ATTACHED UNDER REF. NOs.

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)

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

ATTACH DRAWING(S) 
N-93 (11-2020)

NUCLEAR MATERIAL ACCOUNTANCY AND CONTROL

iii) Physical and chemical form of 

nuclear material 

(with cladding materials description) 

ii) Anticipated types of inventory 

change and possibilities to use this 

measurement point for physical 

inventory taking

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 

 IF NECESSARY, ATTACH DRAWING(S) 
N-93 (11-2020)

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

Signature of Responsible Officer

Date (MM/DD/YYYY)

46. Optional information 

(that the operator considers relevant to 

safeguarding the facility)

44. Decommissioning 

schedule dates 

End of operations (MM/DD/YYYY) Decommissioned (MM/DD/YYYY)

POST-OPERATION INFORMATION