1. Presentation to the Environmental Health Sub-committee – November 2018
26 April 2019

2. Contents Contents Aerial Discharges Liquid Discharges
Critical Group Dose
Waste Disposals
Ongoing Disposals
Repository Closure Programme
Summary
26 April 2019

3. Aerial Discharges
26 April 2019
26 April 2019 3 3

4. Liquid Discharges
26 April 2019
26 April 2019 4 4

5. Liquid Discharges
26 April 2019
26 April 2019 5 5

6. Milk consumption (infants) Total dose to critical group
Critical Group Dose
Summary of critical group doses in the vicinity of the LLWR (µSv)
Pathway
2009
2010
2011
2012
2013
2014
2015
2016
2017
Seafood consumption
0.01
Inhalation (adults)
0.34
0.33
0.36
0.41
0.37
0.40
0.45
Milk consumption (infants)
1.85*
0.47
0.77
0.28
Direct radiation 30 31 35 32
38.6 53
Total dose to critical group 36 33 39 54
UK average annual dose from background radiation = 2200µSv .
26 April 2019
26 April 2019 6 6

7. Direct Dose How it measured: What’s changed: Plans:
Direct / external dose measurement via Thermo Luminescent Dosimeters (TLD’s) ‘permanently’ deployed at the site perimeter.
Measured values used to calculate the reported ‘Direct dose’ following correction to remove background (based on fixed value gained from PHE measurements in the vicinity of the site)
What’s changed:
Background – Variation seen across the site
Dose from imported clean material – Slate deployed on the perimeter track (at one TLD location in particular)
Plans:
Review background
Deploy additional TLD’s to allow dose from slate to be removed. .
26 April 2019
26 April 2019 7 7

8. Waste Disposals
During 2017/18, 93 containers of Low Level Waste were processed for emplacement in Vaults at LLWR.
If no diversion had taken place the indicative number of containers that would have needed to be disposed was an additional ~1000*
* Based on 20m3 / LLW container with no packing efficiency losses included
26 April 2019

9. Ongoing Disposals
Mis-Consignment of waste remains a key risk for LLWR but no significant issues in period. Project work to help minimise the risk is being undertaken.
Repository Development Programme – Tranche 1 (final capping (northern area of trenches & Vault 8)):
Enabling Works – Noise Barriers, Material Movement and Import, Drainage and Stream relocation, Haul Roads
Vault 8 closure - Ullage and Void fill between containers, Higher stacking
Capping – Material movement and trench surcharging, Interim cap repair work, profile placement, cut off wall installation, Final cap
Optimisation and design work progressing. .
26 April 2019
26 April 2019 9 9

10.
26 April 2019

11. Discharges are very low and significantly below historical limits
Summary
Discharges are very low and significantly below historical limits
Doses remain very low
Increase recorded in direct radiological dose but this is linked to imported material and variation in background dose. The fact that these have a significant influence underlines the very low dose stemming from LLWR.
Waste receipt continues to be managed safely and continues to reduce.
Repository Development and closure activities are ongoing.
26 April 2019