INTERNATIONAL ATOMIC ENERGY AGENCY 

DEPARTMENT OF SAFEGUARDS

DESIGN INFORMATION 

QUESTIONNAIRE *

IAEA USE ONLY

N-75 (11-2020)

ISOTOPIC ENRICHMENT PLANTS

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

Isotopic enrichment plants
N-75 (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) 
OVERALL PROCESS PARAMETERS

13. Facility description 

((indicating important items of 

equipment which use, produce or 

process nuclear material, all process 

stages and storage areas and feed, 

product, tail and waste points) 

GENERAL FLOW DIAGRAM(S) ATTACHED UNDER REF. NOs.)

14. Process description 

(identifying sampling and key 

measurement points; MBAs; inventory 

locations)

15. Design capacity 

(Throughput and energy consumption)

16. Anticipated throughput 

(in the form of a forward program 

indicating proportion of various feeds 

and products)

17. Main material description

N-75 (11-2020)

NUCLEAR MATERIAL DESCRIPTION AND FLOW

Feed Product

i) Chemical and physical form

ii) Throughput and enrichment ranges 

(for normal flowsheet operation 

indicating if blending and/or recycling 

takes place)

iii) Batch size/flow rate and campaign 

period

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

MTUSW/annum and MW

Tails

iv) Maximum capability as 

concentration of top product (nat. U 

feed)

v) Storage inventory

vi) Frequency of receipt or shipment

18. Waste material 

i) Source and form 

(indicating major contributors; liquid or 

solid; range of constituents; 

enrichment range; include 

contaminated equipment)

ii) Storage inventory range, method 

and frequency of recovery/disposal 
NUCLEAR MATERIAL DESCRIPTION AND FLOW

N-75 (11-2020)

19. Container and storage area 

descriptions

SEPARATE NOTE TO BE ATTACHED. 

Describing for feeds, products and wastes: the type and size of containers used (include operational capacity); 

method of storage: filling and emptying procedures (include time cycle); and any special identification 

features.

20. Measured discards and retained 

waste As % of input

21. Inventory 

i) In-process 

(within plant and equipment during 

normal operation; indicate quantity, 

form and main and any significant 

change with time or throughput)

22. Maintenance, 

decontamination, clean-out

SEPARATE NOTE TO BE ATTACHED. 

Describing plans and procedures and defining all sampling and key measurement points associated with: 

PLANT MAINTENANCE

i) Normal plant maintenance

ii) Plant and equipment 

decontamination and subsequent 

nuclear material recovery 

iii) Plant and equipment clean-out 

including means of ensuring vessels 

are empty 

23. Basic measures for physical 

protection of nuclear material

PROTECTION AND SAFETY MEASURES

24. Specific health and safety rules 

for inspector compliance 

(if extensive, attach separately)

NUCLEAR MATERIAL ACCOUNTANCY

25. System description 

Give a description of the nuclear 

material accounting system, the 

method of recording and reporting 

accountancy data and establishing 

material balances, procedures for 

account adjustment after plant 

inventory, mistakes, etc., under the 

following headings: 

i) General

SPECIMEN FORMS USED IN ALL PROCEDURES ATTACHED UNDER REF. NOs.

ii) Receipts 

(including method of dealing with 

shipper/receiver differences and 

subsequent account corrections)
N-75 (11-2020)

NUCLEAR MATERIAL ACCOUNTANCY

iii) Shipments 

(product and waste)

LIST OF MAJOR ITEMS OF EQUIPMENT REGARDED AS NUCLEAR MATERIAL CONTAINERS 

ATTACHED UNDER REF. NOS.

iv) Physical inventory 

(Frequency, procedures, estimated 

distribution)

v) Measured discards

vi) Operational records and accounts 

(including method of adjustment or 

correction and place of preservation, 

and language)

26. For each key measurement 

point identified under Qs. 14 and 22 

Give the following: 

For each measurement point fill in 

separate sheet. 

Number of measurement points: 1 

i) Identification

ii) Chemical and physical form of 

material 

iii) Sampling procedure and 

equipment used

iv) Measurement/analytical method 

and equipment used

v) Source and level of random and 

systematic errors 

(weighing, volume, sampling, 

analytical) 

vi) Method of converting source data 

to batch data 

(standard calculative procedures, 

constants and empirical relationships) 

vii) Calculative and error propagation 

technique 

viii) Technique and frequency of 

calibration of equipment used

ix) Program for the continuing 

appraisal of the accuracy of weight, 

volume, sampling techniques and 

measurement methods

 x) Program for statistical evaluation 

of data from (viii) and (ix)
N-75 (11-2020)

NUCLEAR MATERIAL ACCOUNTANCY

27. Features related to containment 

and surveillance measures 

(general description of applied or 

possible measures in reference to floor 

plan or plant layout) 

i) S/R differences

ii) Book inventory

iii) Physical inventory

iv) MUF

OPTIONAL INFORMATION

28. Decommissioning 

schedule dates 

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

PLAN(s) ATTACHED UNDER REF. NOs 

Signature of Responsible Officer

POST-OPERATION INFORMATION

29. Facility decommissioning 

plan

i) Key events of the decommissioning 

plan

ii) Removal and recovery of nuclear 

material

iii) Removing or rendering inoperable 

essential equipment

30. Optional information 

(that the operator considers relevant to 

safeguarding the facility)