Table 10 Open in new tab Radionuclide...

Samples	Classification	Average annual radionuclide concentration of the location	10-year average
Sea water	³H (Bq L⁻¹)	Inside	Water intake	2.42	2.97	3.31	2.10	2.10	2.79	2.86	2.68	2.64	4.78	2.87
Drain	8.72	2.21	7.74	2.42	5.45	2.02	3.43	3.56	4.70	3.08	4.33
Outside	Muan	N/A^a	<MDA^b	<MDA^b	<MDA^b	1.15	2.22	1.28	1.16	<MDA^b	1.43	0.80
Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	2.27	5.83	3.85	3.98
Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	1.36	2.40	1.55	1.77
⁵⁴Mn, ⁵⁸Co, ⁶⁰Co, ¹³¹I (Bq L⁻¹)		<MDA^b
⁹⁰Sr (mBq L⁻¹)	Inside	Drain	1.35	0.56	0.47	1.33	1.73	1.92	1.68	0.63	1.65	0.97	1.23
¹³⁷Cs (mBq L⁻¹)	Inside	Water intake	1.56	1.63	1.30	1.45	1.10	0.95	0.91	1.41	1.32	0.99	1.26
Drain	1.50	1.53	1.53	1.75	1.08	1.16	1.30	1.61	1.51	1.08	1.41
Outside	Muan	N/A^a	N/A^a	1.12	1.63	1.17	1.02	0.95	1.30	1.13	1.02	1.17
Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.86	<MDA^b	1.39	0.84	0.77
Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	1.41	1.31	1.25	1.20	1.29
Seabed soil (Bq kg⁻¹)	⁹⁰Sr	Inside	Drain	0.18	<MDA^b	0.46	0.29	<MDA^b	0.27	0.59	0.35	<MDA^b	<MDA^b	0.21
¹³⁷Cs	Inside	Water intake	1.05	1.16	1.17	1.04	1.26	1.2	0.97	1.12	0.96	0.96	1.09
Drain	0.98	0.82	0.90	0.76	0.67	0.51	0.75	0.93	0.69	0.68	0.77
Outside	Muan	N/A^a	1.35	0.98	0.69	0.81	0.58	0.73	0.32	0.48	0.59	0.72
Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.97	1.14	1.06	1.06
Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.96	0.81	0.53	0.77
Simwon-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.34	0.37	0.38	0.36
⁵⁴Mn, ⁶⁰Co	Inside and outside	<MDA^b

Samples

Classification

Average annual radionuclide concentration of the location

10-year average

Nuclide

Site
(inside or
outside)

Location
(direction, distance)

2014

2015

2016

2017

2018

2019

2020

2021

2022

2023

Sea water

³H
(Bq L⁻¹)

Inside

Water intake

2.42

2.97

3.31

2.10

2.79

2.86

2.68

2.64

4.78

2.87

Drain

8.72

2.21

7.74

2.42

5.45

2.02

3.43

3.56

4.70

3.08

4.33

Outside

Muan

N/A^a

<MDA^b

1.15

2.22

1.28

1.16

<MDA^b

1.43

0.80

Sangha-myeon

N/A^a

2.27

5.83

3.85

3.98

Haeli-myeon

N/A^a

1.36

2.40

1.55

1.77

⁵⁴Mn, ⁵⁸Co, ⁶⁰Co, ¹³¹I (Bq L⁻¹)

<MDA^b

⁹⁰Sr (mBq L⁻¹)

Inside

Drain

1.35

0.56

0.47

1.33

1.73

1.92

1.68

0.63

1.65

0.97

1.23

¹³⁷Cs (mBq L⁻¹)

Inside

Water intake

1.56

1.63

1.30

1.45

1.10

0.95

0.91

1.41

1.32

0.99

1.26

Drain

1.50

1.53

1.75

1.08

1.16

1.30

1.61

1.51

1.08

1.41

Outside

Muan

N/A^a

1.12

1.63

1.17

1.02

0.95

1.30

1.13

1.02

1.17

Sangha-myeon

N/A^a

0.86

<MDA^b

1.39

0.84

0.77

Haeli-myeon

N/A^a

1.41

1.31

1.25

1.20

1.29

Seabed
soil
(Bq kg⁻¹)

⁹⁰Sr

Inside

Drain

0.18

<MDA^b

0.46

0.29

<MDA^b

0.27

0.59

0.35

<MDA^b

0.21

¹³⁷Cs

Inside

Water intake

1.05

1.16

1.17

1.04

1.26

1.2

0.97

1.12

0.96

1.09

Drain

0.98

0.82

0.90

0.76

0.67

0.51

0.75

0.93

0.69

0.68

0.77

Outside

Muan

N/A^a

1.35

0.98

0.69

0.81

0.58

0.73

0.32

0.48

0.59

0.72

Sangha-myeon

N/A^a

0.97

1.14

1.06

Haeli-myeon

N/A^a

0.96

0.81

0.53

0.77

Simwon-myeon

N/A^a

0.34

0.37

0.38

0.36

⁵⁴Mn, ⁶⁰Co

Inside and outside

<MDA^b

Samples	Classification	Average annual radionuclide concentration of the location	10-year average
Sea water	³H (Bq L⁻¹)	Inside	Water intake	2.42	2.97	3.31	2.10	2.10	2.79	2.86	2.68	2.64	4.78	2.87
Drain	8.72	2.21	7.74	2.42	5.45	2.02	3.43	3.56	4.70	3.08	4.33
Outside	Muan	N/A^a	<MDA^b	<MDA^b	<MDA^b	1.15	2.22	1.28	1.16	<MDA^b	1.43	0.80
Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	2.27	5.83	3.85	3.98
Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	1.36	2.40	1.55	1.77
⁵⁴Mn, ⁵⁸Co, ⁶⁰Co, ¹³¹I (Bq L⁻¹)		<MDA^b
⁹⁰Sr (mBq L⁻¹)	Inside	Drain	1.35	0.56	0.47	1.33	1.73	1.92	1.68	0.63	1.65	0.97	1.23
¹³⁷Cs (mBq L⁻¹)	Inside	Water intake	1.56	1.63	1.30	1.45	1.10	0.95	0.91	1.41	1.32	0.99	1.26
Drain	1.50	1.53	1.53	1.75	1.08	1.16	1.30	1.61	1.51	1.08	1.41
Outside	Muan	N/A^a	N/A^a	1.12	1.63	1.17	1.02	0.95	1.30	1.13	1.02	1.17
Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.86	<MDA^b	1.39	0.84	0.77
Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	1.41	1.31	1.25	1.20	1.29
Seabed soil (Bq kg⁻¹)	⁹⁰Sr	Inside	Drain	0.18	<MDA^b	0.46	0.29	<MDA^b	0.27	0.59	0.35	<MDA^b	<MDA^b	0.21
¹³⁷Cs	Inside	Water intake	1.05	1.16	1.17	1.04	1.26	1.2	0.97	1.12	0.96	0.96	1.09
Drain	0.98	0.82	0.90	0.76	0.67	0.51	0.75	0.93	0.69	0.68	0.77
Outside	Muan	N/A^a	1.35	0.98	0.69	0.81	0.58	0.73	0.32	0.48	0.59	0.72
Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.97	1.14	1.06	1.06
Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.96	0.81	0.53	0.77
Simwon-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.34	0.37	0.38	0.36
⁵⁴Mn, ⁶⁰Co	Inside and outside	<MDA^b

Table 10

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Radionuclide concentration in the marine environment around the Hanbit NPPs from 2014 to 2023.

Samples	Classification			Average annual radionuclide concentration of the location										10-year average
Samples	Nuclide	Site (inside or outside)	Location (direction, distance)	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023	10-year average
Sea water	³H (Bq L⁻¹)	Inside	Water intake	2.42	2.97	3.31	2.10	2.10	2.79	2.86	2.68	2.64	4.78	2.87
		Inside	Drain	8.72	2.21	7.74	2.42	5.45	2.02	3.43	3.56	4.70	3.08	4.33
		Outside	Muan	N/A^a	<MDA^b	<MDA^b	<MDA^b	1.15	2.22	1.28	1.16	<MDA^b	1.43	0.80
			Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	2.27	5.83	3.85	3.98
			Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	1.36	2.40	1.55	1.77
	⁵⁴Mn, ⁵⁸Co, ⁶⁰Co, ¹³¹I (Bq L⁻¹)		<MDA^b
	⁹⁰Sr (mBq L⁻¹)	Inside	Drain	1.35	0.56	0.47	1.33	1.73	1.92	1.68	0.63	1.65	0.97	1.23
	¹³⁷Cs (mBq L⁻¹)	Inside	Water intake	1.56	1.63	1.30	1.45	1.10	0.95	0.91	1.41	1.32	0.99	1.26
		Inside	Drain	1.50	1.53	1.53	1.75	1.08	1.16	1.30	1.61	1.51	1.08	1.41
		Outside	Muan	N/A^a	N/A^a	1.12	1.63	1.17	1.02	0.95	1.30	1.13	1.02	1.17
			Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.86	<MDA^b	1.39	0.84	0.77
			Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	1.41	1.31	1.25	1.20	1.29
Seabed soil (Bq kg⁻¹)	⁹⁰Sr	Inside	Drain	0.18	<MDA^b	0.46	0.29	<MDA^b	0.27	0.59	0.35	<MDA^b	<MDA^b	0.21
	¹³⁷Cs	Inside	Water intake	1.05	1.16	1.17	1.04	1.26	1.2	0.97	1.12	0.96	0.96	1.09
		Inside	Drain	0.98	0.82	0.90	0.76	0.67	0.51	0.75	0.93	0.69	0.68	0.77
		Outside	Muan	N/A^a	1.35	0.98	0.69	0.81	0.58	0.73	0.32	0.48	0.59	0.72
			Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.97	1.14	1.06	1.06
			Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.96	0.81	0.53	0.77
			Simwon-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.34	0.37	0.38	0.36
	⁵⁴Mn, ⁶⁰Co	Inside and outside	<MDA^b

Samples	Classification			Average annual radionuclide concentration of the location										10-year average
Samples	Nuclide	Site (inside or outside)	Location (direction, distance)	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023	10-year average
Sea water	³H (Bq L⁻¹)	Inside	Water intake	2.42	2.97	3.31	2.10	2.10	2.79	2.86	2.68	2.64	4.78	2.87
		Inside	Drain	8.72	2.21	7.74	2.42	5.45	2.02	3.43	3.56	4.70	3.08	4.33
		Outside	Muan	N/A^a	<MDA^b	<MDA^b	<MDA^b	1.15	2.22	1.28	1.16	<MDA^b	1.43	0.80
			Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	2.27	5.83	3.85	3.98
			Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	1.36	2.40	1.55	1.77
	⁵⁴Mn, ⁵⁸Co, ⁶⁰Co, ¹³¹I (Bq L⁻¹)		<MDA^b
	⁹⁰Sr (mBq L⁻¹)	Inside	Drain	1.35	0.56	0.47	1.33	1.73	1.92	1.68	0.63	1.65	0.97	1.23
	¹³⁷Cs (mBq L⁻¹)	Inside	Water intake	1.56	1.63	1.30	1.45	1.10	0.95	0.91	1.41	1.32	0.99	1.26
		Inside	Drain	1.50	1.53	1.53	1.75	1.08	1.16	1.30	1.61	1.51	1.08	1.41
		Outside	Muan	N/A^a	N/A^a	1.12	1.63	1.17	1.02	0.95	1.30	1.13	1.02	1.17
			Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.86	<MDA^b	1.39	0.84	0.77
			Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	1.41	1.31	1.25	1.20	1.29
Seabed soil (Bq kg⁻¹)	⁹⁰Sr	Inside	Drain	0.18	<MDA^b	0.46	0.29	<MDA^b	0.27	0.59	0.35	<MDA^b	<MDA^b	0.21
	¹³⁷Cs	Inside	Water intake	1.05	1.16	1.17	1.04	1.26	1.2	0.97	1.12	0.96	0.96	1.09
		Inside	Drain	0.98	0.82	0.90	0.76	0.67	0.51	0.75	0.93	0.69	0.68	0.77
		Outside	Muan	N/A^a	1.35	0.98	0.69	0.81	0.58	0.73	0.32	0.48	0.59	0.72
			Sangha-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.97	1.14	1.06	1.06
			Haeli-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.96	0.81	0.53	0.77
			Simwon-myeon	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	N/A^a	0.34	0.37	0.38	0.36
	⁵⁴Mn, ⁶⁰Co	Inside and outside	<MDA^b

^aNot available due to no analysis point for the year

^bLess than minimum detectable activity

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