2015 Q1 Environmental (redacted).pdf

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DISTRIBUTION

Email distribution to:

1. Environment Agency Site Inspector

2. Head of Radiological Protection and Research Management, Food Standards Agency

3. Head of Profession-Environment and Waste

Original report to be filed in Dosimetry Office.


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ENVIRONMENTAL MONITORING PROGRAMME RESULTS

1st QUARTER 2015

C O N T E N T S

SECTION TITLE PAGE NO

1. PURPOSE 1

2. SCOPE 1

3. RESPONSIBILITIES 1

4. PROCEDURE 1

5. NOTEWORTHY RESULTS 3

6. DEFINITIONS 4

7. REFERENCES 4

8. RECORDS 4

Appendix A Terrestrial Programme: Environmental TLD Results

Appendix B Terrestrial Programme: Environmental Gamma Doserates

Appendix C Terrestrial Programme: Passive Shade Gamma Activity Analysis

Appendix D Terrestrial Programme: Milk Activity Analysis

Appendix E Terrestrial Programme: Herbage Activity Analysis

Appendix F Marine Programme: Beach Gamma Doserate Monitoring

Appendix G Marine Programme: Marine Samples Activity Analysis


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ENVIRONMENTAL MONITORING PROGRAMME RESULTS

1st QUARTER 2015

1. PURPOSE

This report provides the results of the programme of environmental monitoring for radioactivity

around the Wylfa site, to ensure compliance with the conditions within the Environmental Permit (ref.

1) issued by the Environment Agency (EA) for Wylfa Power Station under the Environmental

Permitting (England & Wales) Regulations 2010.

2. SCOPE

This report covers all statutory environmental monitoring identified by the Environment Agency in

the Compilation of Environment Agency Requirements, Approvals and Specifications (CEARAS)

(ref. 2), for the 1st Quarter 2015.

3. RESPONSIBILITIES

3.1 The Head of Health Physics and Chemistry is responsible for reviewing and authorising this

report and for the provision of expert advice on the monitoring of radioactivity in the vicinity

of the Wylfa site.

4. PROCEDURE

All environmental monitoring was carried out in accordance with the procedures listed in the Wylfa

Power Station Health Physics Departmental Instruction WYA/RHI/017/005 “Management of the

Environmental Monitoring Programme” (ref. 3).

All reasonably practicable measures have been taken to achieve the detection limits specified in the

CEARAS. Unless otherwise noted, all positive results (i.e. those exceeding the detection limit) are

quoted with uncertainties at the 95% confidence level based upon counting statistics only. Where

results are less than, or equal to, the detection limit, the detection limit value has been reported. If any

result has exceeded the mean of the previous 12 results plus 3 standard deviations then this will be

noted in the “remarks” column of a particular sample, and, as far as reasonably practicable, an

explanation provided for any such value.

Analysis is carried out locally at the station or at a Contract Laboratory. All analytical methods are

validated and controlled in a manner consistent with the requirements of ISO 17025 that are specified

in the CEARAS.

4.1 Terrestrial Environmental Monitoring Programme


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radioactivity, cosmic contribution, inherent instrument background and man-made

sources (WYA/RHI/017/005 (ref. 3) and TGN-M5 refer (ref. 4)).

The results are listed in Appendix B (Environmental Gamma Doserate measurements).

4.1.3 Passive shades are deployed at eight sites (two shades per site) in two arcs at

approximately 1km and 10km. The shades are collected monthly and analysed by

Gamma Spectrometry at Wylfa. The results are listed in Appendix C.

4.1.4 A sample of milk is collected from each farm on a quarterly basis. The samples are then

analysed by gamma spectrometry at Wylfa. Quarterly samples are bulked to give Inner

(farms 1,3 & 4) and Outer (farms 5-8) quarterly samples which are sent to the Contract

Laboratory for quarterly Sulphur 35 analysis and annual Carbon 14 analysis (to be

completed in Quarter 2). The results are listed in Appendix D. As-76 was detected in

the sample from farm 5 at a level of 4.772 Bq/l with an uncertainty of 40.44%. This

activity is less than the minimum detection limits specified in the CEARAS for ‘other’

nuclides (i.e.


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5. NOTEWORTHY RESULTS

Environmental TLDs

The Harshaw TLD results are generally higher than the Vinten TLD results (as expected and discussed

in the Commissioning Report) so if a statistical test is carried out against the previous 12 results of the

Vinten TLDs many will exceed the mean plus 3 standard deviations, or the mean plus 4 standard

deviations, of the previous 12 Vinten results. This has been discussed separately with the Environment

Agency with a view to finding a way forward for Quarter 3 onwards where we are expecting to only

expose the Harshaw type TLD.

The Vinten result at location W9 (SH36479215) exceeded the mean plus 3 standard deviation of the

previous 12 results. This location is 1.5 miles from the site, and results in the same quadrant at W15

(SH35629264) and W8 (SH35829219), both nearer to site, and W19 (SH36859139), further from the

site, and at the relevant positions on the site fence were all less than the mean of the previous 12

results, so this is not thought to be due to any plant operations.

No other Vinten results exceeded the mean plus 3 standard deviations, or the mean plus 4 standard

deviations, of the previous 12 results.

Environmental Gamma Doserates

The doserate at measurement location 23 exceeded the mean plus 3 standard deviations of the previous12 results. As this location is in the outer ring some 4.5 miles from the Power Station, it is not

considered to have been caused by any plant activities.

Milk

The K-40 activity in the sample from farm 6 exceeded the mean plus 4 standard deviations of the

previous 12 results. As previously agreed this was not reported to the Environment Agency at the time

of discovery due to being naturally occurring activity.

The K-40 activity in the sample from farm 8 exceeded the mean plus 3 standard deviations of the previous 12 results.

As-76 was detected in a milk sample. Please see paragraph 4.1.4 for details.

Herbage

The K-40 activity in the Inner Farm sample exceeded the mean plus 3 standard deviations of the

previous 12 results.

Beach Gamma Doserates

The doserates at Beach locations B2 and B3 (both at Cemlyn Bay) exceeded the mean plus 4 standard

deviations of the previous 12 results. The doserate at location B9 (Porth Padrig) exceeded the mean

plus 3 standard deviations of the previous 12 results.

Whilst all the beach locations had higher doserates than the previous quarter, the increase at Porth

Wnal (Wylfa Outfall) where we would expect the most influence from plant activities was amongst the

smallest The increase at Porth Wnal is similar to the increase at B14 (Amlwch Port the most distant


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Marine

The Caesium-137 activity in the sample of winkles exceeded the mean plus 4 standard deviations of

the previous 12 results. This was notified to the Environment Agency at the time of discovery. The

sample was then recounted and the original activity (1.58 Bq Kg-1) dropped to 1.144 Bq Kg-1 which

did not exceed any statistical test limits. The recounted sample is included in this report.

6. DEFINITIONS

Where “N/A” is noted under results, it indicates that the quantity is “not applicable” for the sample

type or not required to be performed in this quarter (“not assessed”).

Where “N/S” is noted under results, no sample was available from the location or for the sample type.

7. REFERENCES

1. Environment Agency Environmental Permit Number EPR/GB3235DL/V001

2. Compilation of Environment Agency Requirements, Approvals and Specifications (made under

Permit number EPR/GB3235DL/V001) Issue 1.

3. WYA/RHI/017/005 – “Management of the Environmental Monitoring Programme”.

4. Routine Measurement of Gamma Ray Air Kerma Rate in the Environment - Technical Guidance

Note (Monitoring) M5, HMIP, September 1995.

8. RECORDS

This Technical Report is the statutory record of environmental monitoring results.


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Site Exposure Exposure Exposure Exposure Exposure Exposure Exposure

Start End Period (Sv) (Sv/day) (Sv) (Sv/day)

W1 18/01/2015 18/04/2015 90.00 276.61 3.07 314.07 3.49

W2 18/01/2015 18/04/2015 90.00 172.97 1.92 260.30 2.89

W3 18/01/2015 18/04/2015 90.00 143.90 1.60 243.77 2.71

W4 18/01/2015 18/04/2015 90.00 171.61 1.91 268.80 2.99

W5 18/01/2015 18/04/2015 90.00 204.20 2.27 318.83 3.54W6 18/01/2015 18/04/2015 90.00 160.52 1.78 243.89 2.71

W7 19/01/2015 18/04/2015 89.00 143.07 1.61 243.93 2.74

W8 18/01/2015 18/04/2015 90.00 144.15 1.60 270.21 3.00

W9 17/01/2015 18/04/2015 91.00 275.00 3.02 291.34 3.20

W10 17/01/2015 18/04/2015 91.00 186.54 2.05 297.72 3.27

W11 18/01/2015 18/04/2015 90.00 196.89 2.19 249.33 2.77

W12 17/01/2015 18/04/2015 91.00 184.00 2.02 277.13 3.05

W13 18/01/2015 18/04/2015 90.00 177.51 1.97 243.08 2.70

W14 18/01/2015 18/04/2015 90.00 142.00 1.58 269.56 3.00

W15 17/01/2015 18/04/2015 91.00 150.75 1.66 230.53 2.53W16 17/01/2015 18/04/2015 91.00 209.33 2.30 271.12 2.98

W17 19/01/2015 18/04/2015 89.00 156.09 1.75 MISSING TLD N/A

W18 18/01/2015 18/04/2015 90.00 158.48 1.76 333.71 3.71

W19 17/01/2015 18/04/2015 91.00 183.86 2.02 246.70 2.71

W20 18/01/2015 19/04/2015 91.00 206.69 2.27 228.15 2.51

W21 17/01/2015 19/04/2015 92.00 190.62 2.07 247.50 2.69

W22 17/01/2015 19/04/2015 92.00 193.06 2.10 253.66 2.76

W23 17/01/2015 19/04/2015 92.00 143.63 1.56 272.66 2.96

W24 18/01/2015 19/04/2015 91.00 109.40 1.20 265.50 2.92

W25 18/01/2015 19/04/2015 91.00 260.48 2.86 284.08 3.12W26 18/01/2015 19/04/2015 91.00 168.75 1.85 282.36 3.10

W27 18/01/2015 19/04/2015 91.00 207.71 2.28 310.80 3.42

W28 18/01/2015 19/04/2015 91.00 118.44 1.30 262.78 2.89

W29 18/01/2015 19/04/2015 91.00 197.98 2.18 309.06 3.40

W30 18/01/2015 19/04/2015 91.00 202.41 2.22 326.89 3.59

W31 18/01/2015 19/04/2015 91.00 210.23 2.31 335.68 3.69

W32 18/01/2015 19/04/2015 91.00 237.65 2.61 301.23 3.31

W33 17/01/2015 19/04/2015 92.00 231.24 2.51 325.12 3.53

W34 17/01/2015 19/04/2015 92.00 261.98 2.85 276.69 3.01

W35 18/01/2015 18/04/2015 90.00 227.50 2.53 256.28 2.85W36 18/01/2015 19/04/2015 91.00 231.22 2.54 305.62 3.36

W37 18/01/2015 18/04/2015 90.00 201.30 2.24 285.43 3.17

W38 18/01/2015 18/04/2015 90.00 175.75 1.95 272.75 3.03

W39 18/01/2015 18/04/2015 90.00 126.04 1.40 235.74 2.62

W40 18/01/2015 19/04/2015 91.00 183.40 2.02 246.29 2.71

W41 18/01/2015 18/04/2015 90.00 191.49 2.13 269.53 2.99

W42 18/01/2015 18/04/2015 90 00 172 33 1 91 251 57 2 80

Harshaw

APPENDIX A

ENVIRONMENTAL TLD RESULTSFirst Quarter 2015

Vinten


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Site Exposure Exposure Exposure Exposure Exposure Exposure Exposure

Start End Period (Sv) (Sv/day) (Sv) (Sv/day)

F1 19/01/2015 18/04/2015 89.00 184.44 2.07 341.79 3.84

F2 19/01/2015 18/04/2015 89.00 167.21 1.88 313.22 3.52

F3 19/01/2015 18/04/2015 89.00 193.07 2.17 266.63 3.00

F4 19/01/2015 18/04/2015 89.00 201.71 2.27 264.76 2.97F5 19/01/2015 18/04/2015 89.00 186.46 2.10 249.68 2.81

F6 19/01/2015 18/04/2015 89.00 224.66 2.52 293.68 3.30

F7 19/01/2015 18/04/2015 89.00 265.90 2.99 350.24 3.94

F8 19/01/2015 18/04/2015 89.00 264.83 2.98 332.18 3.73

F9 19/01/2015 18/04/2015 89.00 229.59 2.58 339.81 3.82

F10 19/01/2015 18/04/2015 89.00 177.74 2.00 265.98 2.99

F11 19/01/2015 18/04/2015 89.00 201.96 2.27 309.32 3.48

F12 19/01/2015 18/04/2015 89.00 142.96 1.61 362.70 4.08

Remarks:

Both Vinten (old type) and Harshaw (new type) TLD results are shown.

The Harshaw TLD results are generally higher than the Vinten TLD results (as expected and discussed in the Commissioning Report)

so if a statistical test is carried out against the previous 12 results of the Vinten TLDs many will exceed the mean plus 3 standard

deviations, or the mean plus 4 standard deviations, of the previous 12 Vinten results. This has been discussed separatly with the

Environment Agency with a view to finding a way forward for Quarter 3 onwards where we are expecting to only expose the Harshaw

type TLD.

The Vinten result at location W9 exceeded the mean plus 3 standard deviation of the previous 12 results. This location is 1.5 miles

from the site, and results in the same quadrant at W15, W8 (nearer to site) and W19 (further from the site) and at the relevant positions

on the site fence were all less than the mean of the previous 12 results, so this is not thought to be due to any plant operations.

No other Vinten results exceeded the mean plus 3 standard deviations, or the mean plus 4 standard deviations, of the previous 12 results.

Vinten Harshaw

APPENDIX A Continued

ENVIRONMENTAL TLD RESULTSFirst Quarter 2015


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600 SEC INNER GRID REF. DATE

COUNT GROSS NET Annual Mean

969 1 354945 26-Mar-15 83.7 31.9 ***** *** - ***

1052 2 358944 26-Mar-15 90.8 39.0 ***** *** - ***1012 3 361939 26-Mar-15 87.4 35.6 ***** *** - ***

1061 4 362936 26-Mar-15 91.6 39.8 ***** *** - ***

1030 5 358932 26-Mar-15 88.9 37.1 ***** *** - ***

1089 6 353930 10-Mar-15 94.0 42.2 ***** *** - ***

1053 7 350928 10-Mar-15 90.9 39.1 ***** *** - ***

1077 8 343930 10-Mar-15 93.0 41.2 ***** *** - ***

1097 9 343934 10-Mar-15 94.7 42.9 ***** *** - ***1171 10 349939 26-Mar-15 101.1 49.3 ***** *** - ***

1214 11 350943 26-Mar-15 104.8 53.0 ***** *** - ***

1196 12 350942 10-Mar-15 103.3 51.5 ***** *** - ***

OUTER

1120 13 425945 21-Mar-15 96.7 44.9 ***** *** - ***

1131 14 425931 21-Mar-15 97.7 45.9 ***** *** - ***

1099 15 419902 21-Mar-15 94.9 43.1 ***** *** - ***

1126 16 412895 21-Mar-15 97.2 45.4 ***** *** - ***

1211 17 392875 08-Feb-15 104.6 52.8 ***** *** - ***

1237 18 382867 08-Feb-15 106.8 55.0 ***** *** - ***

1212 19 354858 08-Feb-15 104.7 52.8 ***** *** - ***

1279 20 347858 08-Feb-15 110.4 58.6 ***** *** - ***

1220 21 327864 08-Feb-15 105.4 53.5 ***** *** - ***

1179 22 313866 08-Feb-15 101.8 50.0 ***** *** - ***

1264 23 303877 08-Feb-15 109.2 57.3 ***** *** - ***

1230 24 305911 08-Feb-15 106.2 54.4 ***** *** - ***

1266 25 297928 25-Mar-15 109.3 57.5 ***** *** - ***

1036 26 332939 25-Mar-15 89.5 37.7 ***** *** - ***

Annual Range

APPENDIX B

ENVIRONMENTAL GAMMA DOSERATES

First Quarter 2015

DOSERATE nGy/h NET DOSERATE nGy/h


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Grid Ref Be-7 Uncertainty Cs-137 Uncertainty Co-60 Uncertainty

H1TS 342932 20.51 5.7%


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Time of count detection limits for each group of radionuclides measured are detailed in the table below.

No specified radionuclides above limits of detection unless stated otherwise.

Co-60, I-131, Cs-134, Cs- 137 Nb-95, Zr-95, Ru-106, Sb-125

Ce-144, Eu-154, Eu-155, Ag-110

Time of count0.20 0.70Detection Limit

(Bq shade-1

)


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MILK ACTIVITY ANALYSIS

FARM

NUMBER K-40 Uncertainty Cs-137 Uncertainty Co-60 Uncertainty

1 58.24 6.81%


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GAMMA SPECTROMETRY ANALYSIS

Gamma Activity (Bq kg-1

wet)

K-40 Uncertainty Cs-137 Uncertainty Co-60 Uncertainty169.49 4.6%


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600 sec SITE NAME CODE DATE

COUNT GROSS NET Annual Mean

1107 Trwyn Cemlyn B1 22-Mar-15 95.6 43.8 ***** *** - ***

1122 Cemlyn B2 22-Mar-15 96.9 45.1 ***** *** - ***

1119 Cemlyn Beach B3 22-Mar-15 96.6 44.8 ***** *** - ***

1167 Cerrig Brith B4 25-Mar-15 100.8 49.0 ***** *** - ***

1170 Porth y Pistyll B5 25-Mar-15 101.0 49.2 ***** *** - ***

1029 Porth y Ogof B6 26-Mar-15 88.9 37.0 ***** *** - ***

1080 Porth Wylfa B7 26-Mar-15 93.3 41.5 ***** *** - ***

1197 Cemaes Bay B8 15-Mar-15 103.4 51.6 ***** *** - ***

1216 Porth Padrig B9 15-Mar-15 105.0 53.2 ***** *** - ***

1157 Porth Wen B10 10-Mar-15 99.9 48.1 ***** *** - ***

1201 Porth Llechog B11 15-Mar-15 103.7 51.9 ***** *** - ***

1161 Porth Amlwch B12 25-Mar-15 100.3 48.4 ***** *** - ***

1236 Creek Amlwch B13 25-Mar-15 106.7 54.9 ***** *** - ***

1222 Porth Wnal B14 10-Mar-15 105.5 53.7 ***** *** - ***

REMARKS

Gross Doserates - Uncorrected Doserates

Net Doserates - Measured readings minus the cosmic component and inherent background.

Calibration factor c.p.s./(microGy/h) 19.3 Cal Cert. 1428544GJ

Cosmic component c.p.s. 0.8

Inherent background component c.p.s. 0.2

The doserates at Beach locations B2 and B3 (both at Cemlyn Bay) exceeded the mean plus 4 standard deviations of the previous

12 results. This was reported to the Environment Agency at the time of discovery.

The doserate at location B9 (Porth Padrig) exceeded the mean plus 3 standard deviations of the previous 12 results.

Whilst all the beach locations had higher doserates than the previous quarter the increase at Porth Wnal (Wylfa Outfall) where we

APPENDIX F

BEACH GAMMA DOSERATE MONITORINGFirst Quarter 2015

Annual Range

DOSERATE nGy/h NET DOSERATE nGy/h


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Sediment

Dry/

Sample Location Code Date Wet

Ratio Activity Uncertainty Activity Uncertainty Activity Uncertainty Activity Uncertainty Activity Uncertainty

Silt Cemaes Bay HO/SL/B8 27-Feb-15 0.55 365.99 5.5% 11.08 6.2%

Documents

2015 Q1 Environmental (redacted).pdf