ML15085A424

Nuclear Reactor Effluents Webinar

ML15085A424
Person / Time
Site:	Catawba
Issue date:	03/24/2015
From:	Steven Garry NRC/NRR/DRA
To:
Lynch J
References
Download: ML15085A424 (33)

Text

Nuclear Plant Effluents Webinar March 24 24, 2015 Steve Garry, CHP NRR Sr. Health Physicist, R di ti P Radiation Protection t ti and dCConsequences BBranch h

Division of Risk Assessment Office of Nuclear Reactor Regulation

Effluent Monitoring g

• Each plant monitors discharges of:

• Noble gas (e.g.,

(e g krypton, krypton xenon xenon, argon)

• Tritium - normal discharges

• Tritium - leaks and spills

• C b 14 Carbon-14

• Iodine and Particulates (e.g., cobalt, cesium, strontium)

- Effluent Reports - 3 types

• Individual plant reports (prepared by each plant)

• Summary reports (prepared by NRC)

• T iti Tritium reports t (plants

( l t withith groundwater d t ttritium iti contamination t i ti

• All reports posted on the NRC public web site 2

NRCs public web site:

http://www.nrc.gov http://www nrc gov Click on NUCLEAR REACTORS 3

Click on Operating Reactors 4

Click on Operational Experience 5

Click on Groundwater Groundwater Contamination (Tritium) 6

Click on Radioactive Effluent and Environmental Reports Reports 7

• Click on your nuclear plant, or

• click on Radioactive Effluent Summary y Report p (by year) 8

Click on Catawbas R di Radioactive ti Effl t 2013 Effluentt Reports:

R 9

Catawba Letter to NRC (this is a pdf file, file so you scroll instead of clicking) 10

Catawba effluent data - 2013 How to read exponential notation?

2.06E+01 is read by moving decimal 1 digit to the right so 2.06E+1 Ci is really 20.6 Ci, where Ci is curies. Curies is 37 million transformations per second.

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NRC Effluent Summary Reports

• NRC prepares Radioactive Effluent Summary Reports for each calendar year

• p The link to these annual reports is p provided on NRC web site

• So we return to NRC web page for Radioactive Effluent and Environmental Reports Reports

• Click on last line, the Radioactive Effluent Summary Report 12

Click on the Radioactive Effluent Summary Reports by year 13

14 NUREG/CR-2907 (now in a pdf file, so clicking doesnt work) 15

16

Long-term Trend in Gases 17

Long-term Trends in Liquids 18

Catawba Noble Gas Effluents 19

Catawba Liquid Effluents

- Routine, R ti planned l d ttritium iti releases l

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Typical Nuclear Plant Effluents (2010 Data)

• Gases Effluents BWRs PWRs

- Tritium T iti 25 Ci (191 max)) 32 Ci (1190 max))

- Noble gas 11 Ci (450 max) 0.5 Ci (207 max)

- C-14 12 Ci (18 max) 8.5 Ci (13 max)

- Iodine 1 mCi (20 max) 0.002 mCi (2 max)

- Particulates 0.2 mCi (6.6 max) 0.002 mCi (0.4 max)

• Liquid Effluents

- Tritium 5 Ci (150 max) 568 Ci (1700 max)

- Iodine 0.01 mCi (0.4 max) 0.003 mCi (10 max)

- Particulates 0.5 mCi (40 max) 0.01 mCi (0.12 max)

- Noble gas None None

- C-14 None None 21

Radiation Dose to the Public National Council on Radiation Protection 22

Radiation Dose 23

NUREG-CR/2907 C t b - Gaseous Catawba G Doses D

Maximum Exposed Individual 7.70E-1 is 0.77 mrem (compared to 620 mrem from all sources) 24

Catawba - Liquid Doses M i Maximum E Exposed d IIndividual di id l 2 51E-02 is 0 2.51E-02 0.0251 0251 mrem (compared to 620 mrem from all sources) 25

Tritium Leaks Many plants have had leaks - see list below

• Nuclear p plants monitor for tritium leaks into g ground water

• Each plants groundwater tritium results are provided in their annual effluent or environmental reports

• NRC publishes the historical and current maximum values for each plant on the NRC public web page 26

List of Leaks and Spills

• 6 month updates published on NRC web site

• 45 sites have had > 20 20,000 000 pCi/L

• 15 sites currently have > 20 20,000 000 pCi/L 27

List of Tritium Leaks:

Click on Plant Plant Sites with Licensed Radioactive Material in Groundwater (i.e., list of plants with tritium leaks) 28

29 Groundwater Tritium

• Comparison Values

- EPA drinking water at faucet (tap): 20,000 pCi/L = 4 mrem

- EPA 40 CFR 190 public dose limit: = 25 mrem

- NRC in surface waters: = 50 mrem 30

Catawba effluent report 31

Catawba tritium data 1 pCi/L is extremely small, 1 part in a million times a million or 1 part in 1,000,000,000,000 2.35E+02 is 235 pCi/L 1.05E+03 is 1,050 pCi/L EPA drinking water is 20 20,000 000 pCi/L 32

Questions and Discussion

?

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