# The Nuclear Safeguards (EU Exit) Regulations 2019, Part 3: MATERIAL BALANCE REPORT (MBR)

Extent: E+W+S+N.I.

Label/tag
Content
Comments
#
MBA
Character (4)
MBA code of reporting MBA
1
Report type
Character (1)
M for Material Balance Report
2
Report date
DDMMYYYY
Date on which the report was completed
3
Start report
DDMMYYYY
Starting date of MBR (date of last PIT +1 day)
4
End report
DDMMYYYY
End date of MBR (date of current PIT)
5
Report number
Number (8)
Sequential number, no gaps
6
Element category
Character (1)
Category of qualifying nuclear material
7
Line count
Number (8)
Total number of lines reported
8
Reporting person
Character (30)
Name of person responsible for report
9
IC code
Character (2)
Type of inventory change
10
Line number
Number (8)
Sequential number, no gaps
11
Element weight
Number (24.3)
Element weight
12
Isotope
Character (1)
G for U-235, K for U-233, J for a mixture of U-235 and U-233
13
Fissile weight
Number (24.3)
Weight of fissile isotope
14
Obligation
Character (2)
Safeguards obligation
15
Correction
Character (1)
D for deletions, A for additions forming part of a deletion/addition pair, L for late lines (stand-alone additions)
16
Previous report
Number (8)
Report number of line to be corrected
17
Previous line
Number (8)
Line number of line to be corrected
18
Comment
Character (256)
Operator comment
19
CRC
Number (20)
Hash code of line for quality control purposes
20
Previous CRC
Number (20)
Hash code of line to be corrected
21
Explanatory notes
1.
MBA:
Code of the reporting material balance area. This code is notified to the qualifying nuclear facility concerned by the ONR.
2.
REPORT TYPE:
M for material balance reports.
3.
REPORT DATE:
Date on which the report was completed.
4.
START REPORT:
Start date of MBR, date of the day immediately following the day of the previous physical inventory taking.
5.
END REPORT:
End date of MBR, date of current physical inventory taking.
6.
REPORT NUMBER:
Sequential number, no gaps.
7.
ELEMENT CATEGORY:
The following code for categories of qualifying nuclear material must be used:
Category of qualifying nuclear material
Code
Plutonium
P
High enriched uranium
(20% enrichment and above)
H
Low enriched uranium
(higher than natural but less than 20% enrichment)
L
Natural uranium
N
Depleted uranium
D
Thorium
T
8.
LINE COUNT:
Total number of lines reported.
9.
REPORTING PERSON:
Name of person responsible for report.
10.
IC CODE:
The different types of inventory information and of inventory change should be entered in the sequence indicated below. The following codes must be used:
Keyword
Code
Examination
Beginning physical inventory
PB
Physical inventory at the beginning of the reporting period (must be equal to the physical inventory at the end of the previous reporting period).
Inventory changes
(only codes in the list below)
For each type of inventory change, one consolidated line has to be entered for the entire reporting period (first increases, then decreases).
Ending book inventory
BA
Book inventory at the end of the reporting period. It must be equal to the arithmetic sum of the MBR entries above.
Ending physical inventory
PE
Physical inventory at the end of the reporting period.
Material unaccounted for
MF
Material unaccounted for. Must be calculated as
‘ending physical inventory (PE)’
minus
‘ending book inventory (BA)’.
For inventory changes, one of the following codes must be used:
Keyword
Code
Explanation
Receipt
RD
Receipt of nuclear material from a material balance area within the United Kingdom.
Import
RF
Import of qualifying nuclear material.
Receipt from non-safeguarded activity
RN
Receipt of qualifying nuclear material from a non-safeguarded activity.
Shipment
SD
Transfer of nuclear material to a material balance area within the United Kingdom.
Export
SF
Export of qualifying nuclear material.
Shipment to non-safeguarded activity
SN
Transfer of qualifying nuclear material to a non-safeguarded activity.
Transfer to conditioned waste
TC
Qualifying nuclear material contained in waste that is measured or estimated on the basis of measurements, and which has been conditioned in such a way (e.g. in glass, cement, concrete or bitumen) that it is not suitable for further nuclear use. The quantity of qualifying nuclear material involved is to be subtracted from the inventory of the material balance area. Separate records must be kept for this type of material.
Discards to the environment
TE
Qualifying nuclear material contained in waste that is measured or estimated on the basis of measurements, and which has been irrevocably discarded to the environment as the result of a planned discharge. The quantity of qualifying nuclear material involved is to be subtracted from the inventory of the material balance area.
Transfer to retained waste
TW
Qualifying nuclear material generated from processing or from an operational accident contained in waste that is measured or estimated on the basis of measurements and which is irrecoverable for the time being, but which is stored. The quantity of qualifying nuclear material involved is to be subtracted from the inventory of the material balance area. Separate records must be kept for this type of material.
Retransfer from conditioned waste
FC
Retransfer of conditioned waste to the inventory of the material balance area. This applies whenever conditioned waste undergoes processing.
Retransfer from retained waste
FW
Retransfer of retained waste to the inventory of the material balance area. This applies whenever retained waste is retrieved from the specific location within the material balance area, either for any processing involving the separation of elements in the material balance area or for any shipment from the material balance area.
Accidental
loss
LA
Irretrievable and inadvertent loss of a quantity of qualifying nuclear material as the result of an operational accident. Use of this code in the MBR is only allowed if a special report was sent to the ONR when the inventory change occurred or became known.
Accidental
gain
GA
Qualifying nuclear material unexpectedly found, except when detected in the course of a physical inventory taking. Use of this code in the MBR is only allowed if a special report was sent to the ONR when the inventory change occurred or became known.
Category change
CE
Accountancy transfer of a quantity of qualifying nuclear material from one category to another as a result of an enrichment process.
Category change
CB
Accountancy transfer of a quantity of qualifying nuclear material from one category to another as a result of a blending operation.
Category change
CC
Accountancy transfer of a quantity of qualifying nuclear material from one category to another for all types of category change not covered by codes CE and CB.
Change in particular obligation
BR
Accountancy transfer of a quantity of qualifying nuclear material from one particular safeguard obligation to another, to balance the total uranium stock following a blending operation.
Change in particular obligation
PR
Accountancy transfer of a quantity of qualifying nuclear material from one particular safeguard obligation to another, used when qualifying nuclear material enters or leaves an accountancy pool.
Change in particular obligation
SR
Accountancy transfer of a quantity of qualifying nuclear material from one particular safeguard obligation to another, following an obligation exchange or a substitution.
Change in particular obligation
CR
Accountancy transfer of a quantity of qualifying nuclear material from one particular safeguard obligation to another, for all cases not covered by codes BR, PR or SR.
Nuclear production
NP
Increase in the quantity of qualifying nuclear material due to nuclear transformation.
Nuclear loss
NL
Decrease in the quantity of qualifying nuclear material due to nuclear transformation.
Shipper/
receiver difference
DI
Shipper/receiver difference.
New measurement
NM
Quantity of qualifying nuclear material, in one particular batch, accounted for in the qualifying nuclear material balance area, being the difference between a newly measured quantity and the quantity formerly accounted for, and which is neither a shipper/receiver difference nor a correction.
Balance adjustment
BJ
Quantity of qualifying nuclear material accounted for in the material balance area, being the difference between the result of a physical inventory taken by the facility operator for his own purposes (without reporting a physical inventory listing to the ONR) and the book inventory established on the same date.
Roundings
RA
Rounding adjustment to make the sum of the quantities reported in a given period coincide with the ending book inventory of the material balance area.
Isotope adjustment
R5
Adjustment to make the sum of the isotope quantities reported coincide with the ending book inventory for U-235 of the material balance area.
Material production
MP
Quantity of qualifying nuclear material, obtained from substances originally not subject to safeguards, which has become subject to safeguards because its concentration now exceeds the minimum levels.
Termination of use
TU
Quantity of qualifying nuclear material in concentrations or chemical forms which make the qualifying nuclear material no longer usable for any nuclear activity relevant for safeguards, or which is considered as practically irrecoverable, and which is:
(i)
incorporated in end products used for non-nuclear purposes; or
(ii)
contained in waste in very low concentrations measured or estimated on the basis of measurements, even if these materials are not discarded to the environment.
The quantity of qualifying nuclear material involved is to be subtracted from the inventory of the material balance area.
11.
LINE NUMBER:
Sequential number starting with 1, no gaps.
12.
ELEMENT WEIGHT:
The weight of the element category referred to in field 7 must be reported. All weights must be reported in grams. The decimal digits appearing in the accounting lines can be reported up to a maximum of three decimal places.
13.
ISOTOPE:
This code indicates the kind of fissile isotopes involved and should be used when the weight of fissile isotopes is reported. Use the code G for U-235, K for U-233, and J for a mixture of U-235 and U-233.
14.
FISSILE WEIGHT:
Unless otherwise stated in the particular safeguard provisions, the weight of fissile isotopes must only be reported for enriched uranium and category changes involving enriched uranium. All weights must be reported in grams. The decimal digits appearing in the accounting lines can be reported up to a maximum of three decimal places.
15.
OBLIGATION:
Indication of any additional obligation assumed by the United Kingdom under a relevant international agreement, to which the qualifying nuclear material is subject (regulation 19). The ONR may communicate the appropriate codes to the qualifying nuclear facility.
16.
CORRECTION:
Corrections have to be made by deleting the wrong line(s) and adding the correct one(s), where appropriate. The following codes must be used:
Code
Explanation
D
Deletion. The line to be deleted must be identified by indicating in field 17 the report number (6), in field 18 the line number (11) and in field 21 the CRC (20) which were declared for the original line. Other fields need not be reported.
A
Addition (forming part of a deletion/addition pair). The correct line must be reported with all data fields, including the ‘previous report’ field (17) and the ‘previous line’ field (18). The ‘previous line’ field (18) must repeat the line number (11) of the line being replaced by the deletion/addition pair.
L
Late line (stand-alone addition). The late line to be added must be reported with all data fields, including the ‘previous report’ field (17). The ‘previous report’ field (17) must contain the report number (6) of the report in which the late line should have been included.
17.
PREVIOUS REPORT:
Indicate the report number (6) of the line to be corrected.
18.
PREVIOUS LINE:
For deletions, or additions forming part of a deletion/addition pair, indicate the line number (11) of the line to be corrected.
19.
COMMENT:
Free-text comment field for short comments by operator.
20.
CRC:
Hash code of line for quality control purposes. The ONR must inform the operator of the algorithm to be used.
21.
PREVIOUS CRC:
Hash code of the line to be corrected.
GENERAL REMARKS CONCERNING THE COMPLETION OF THE REPORTS
General remarks 2, 3, 4, 5 and 6 at the end of Part 2 apply to this Part as appropriate.
This form, duly completed and signed, must be sent to the ONR in accordance with regulation 35.

---
Source: https://www.legislation.gov.uk/uksi/2019/196/schedule/1/part/3 (the official version)
Page: https://openlegislation.uk/nuclear-safeguards-eu-exit-regulations-2019/schedule-1/part-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.