ML20050C722
| ML20050C722 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 04/01/1982 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML20050C718 | List: |
| References | |
| NUDOCS 8204090288 | |
| Download: ML20050C722 (5) | |
Text
e-O Consumers Power Company BIG ROCK POINT PLANT 50-155 ENVIRON!fENTAL MONITORING REPORT JANUARY - DECEMBER 1981 l
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nn0482-0005bl42 April 1, 1982 8204090288 820401 PDR ADOCK 05000155 R
ppy_ _ _ _. _., _ _ _ _ _ _. _ _, _ _, _ _ _ _ _ _. _ _ _ _ _.. _ _ _, _, _ _ _ _. _ _
1 This report provides information relating to environmental monitoring at the Big Rock Point Plant during the period of January through December 1981 as required by Technical Specification 6.9.3.b.
II.
ENVIRONMENTAL MONITORING A.
Sampling Summary For each medium sampled, Table II-Al contains the number of sampling locations, total number of samples collected and the number of loca-tions at which levels were found to be significantly above local con-current background. A listing of the highest, lowest and annual average concentration for the sampling point with the highest average concen-tration is presented in Table II-A2.
B.
Environmental Dose Estimates Levels of radioactive materials in environmental media do not indicate the likelihood of public intake in excess of 1% of those that could result from continuous annual exposure to the concentration values listed in Appendix B, Table II, Part 20.
C.
Variation of Environmental Concentrations with Time Statistical analyses of the data for significance at P <0.05 show that there are only two differences in sampled media over backerou pe-riphyton at the discharge andone milk sampling location (LK) nd:
where Sr-90 indicative of crop uptake of Chinese fallout is observel. An evaluation based on plant releases of various radionuclides shows it to be extreme-ly unlikely that the Sr-90 is of plant origin in milk.
For discussion of periphyton results, see D.5 D.
Discussion and Interpretation of Results 1.
Air Samples:
No significant increase above concurrent background was observed at the air particulate sampling locations.
No iodine-131 activity on the charcoal cartridges was observed above the minimum detectable level.
This is consistent with ex-pected results based on actual plant effluents and site meteoro-logy.
2.
Lake Water: Monthly composite samples of the plant intake and discharge indicate no statistically significant difference at p<0.05.
Gross Beta concentrations ranged from <1 to 12 pCi/2 and tritium concentrations ranged from <110 to 990 pCi/t.
The Charlevoix drinking water sample does not indicate the pres-ence of other than natural background radioactivity.
3 Well Water: Well water samples do not indicate the presence of other than natural background radioactivity.
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j h.
Milk:
Strontium-90 and Cesium-137 vere the only radionuclides detectable in milk samples collected during the period. Con-centrations of these two isotopes are consistent with concurrent background due to past weapons test fallout.
One farm exhibited levels just significant at P <0.05 above background, but absence of short-lived fission products such as I-131 indicate the origin to be from fallout due to the 25th Chinese test rather than from the Big Rock Point Plant (see item C). -No correlation with plant effluents is observed.
5 Aquatic Biota: Samples of periphyton, algae, crayfish and fish are collected semiannually, when available.
Periphyton samples collected near.the discharge appear to contain higher concentra-tions of certain radionuclides (Ce-lkh, Cs-137, Co-60 and Mn-5h) than samples collected at remote locations.
This localized in-crease has also been observed and reported by the Great Lakes Radioecology Group at Argonne National Laboratory.
Current lev-els are consistent with levels observed over the past few years.
Plant erfluent is considered to be the major contributor to this difference, although correlation with effluent as.a function of time is not possible due to presence of >nly two samples per year.
6.
Gamma Dose:
Both thennoluminescent dosimeters and film are used to monitor the levels of gamma radiation in the vicinity of the site. There were no significant differences in levels observed at the various sampling locations based on statistical analysis of quarterly data. Monthly comparison of TLD data, however, showed three months of data which were significantly higher than controls.
Evaluation of t'.ese data indicate no direct correla-tion with effluent release, but do show that the largest varia-tions occur during change _s in fallout activity levels.
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TABLE II-Al BIG ROCK POINT NUCLEAR POWER PLANT RADIOLOGICAL ENVIRONMENTAL MONITORING SAMPLING AND ANALYSIS
SUMMARY
JANUARY 1, 1981 TO DECEMBER 31, 1981
- OF
- OF NUMBER OF LOCATIONS SAMPLING SAMPLES SIGNIFICANTLY ABOVE MEDIUM DESCRIPTION TYPE OF ANALYSTS FREQUENCY LOCATIONS COLLECTED CONCURREFT BACKGROUND Air Continuous Gross Beta, I-131 Weekly 7
369 None
@ approx 1 cfm Lake Composite Gross Beta, H-3 Monthly 3
36 None Water Well Grab Gross Beta Monthly 1
12 None Water Milk Grab I-131, Sr-89/90, Monthly h
48 1
Gamma Isotopic (Cs-137)
Gamma Continuous TLD Monthly 12 lbh 3*
Dose Quarterly 12 48 None Film Monthly 12 lhh None Aquatic Grab Gross Beta, Semiannually 5
hh 1
Biota Sr-89/90, Gamma Isotopic 0 Three months of TLD data indicate field dosimeter population significantly higher than controls during those months.
However, quarterly donimeters do not indicate significant differences, and no correlation with effluent release is found.
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TABLE II-A2 BIG ROCK POINT NUCLEAR POWER PLANT HIGH, LOW AND AVERAGE CONCENTRATION FOR THE HIGHEST AVERAGE SAMPLING LOCATION JANUARY 1, 1981 to DECEMBER 31, 1981 LOWER LIMIT MEDIA TYPE OF ANALYSIS OF DETECTION LOCATION HIGH LOW AVERAGE Air Gross Beta 0.01 Cii (h.5 miles SW) bl.0 1.0 13.3 3
(pCi/m )
I-131 0.02 All
<LLD Iake Water Gross Beta 1.0 Inlet 12.0 1.0 5.h (pCi/2)
H-3 100.O Discharge 990.0 190.0 h51.1 Well water Gross Beta 1.0 Site h.0 2.0 2.9 (pCi/1)
Milk I-131 0.5 All
<LLD (pci/t)
Cs-137 1.0 BB (11.5 miles E) 12.0 h.0 7.h Sr-89 5.0 All
<LLD Sr-90 1.0 GS (2.3 miles SE) 10.0 2.0 5.3 DL (2.5 miles E) 11.0 3.0 5.3 Gamma Dosa TLD (Monthly)
NM (3 miles E) 17.9 h.8 10.0 (mR/ month)
Film (Monthly)
Near mouth of Susan Creek 7.0 0.8 (4.0 miles SSE)
(mR/ quarter)
TLD (Quarterly)
C (0.8 miles SW) 22.6 12.h 17.1 Biota (d) (pCi/g Wet)
Pe"iphyton All identified y Activity Discharge 34.6 lb.2 24.4 Algae All identified y Activity Mt. McSauba (3 miles W) 20.7 1.57 11.1 Crayfish All Identified y Activity Discharge 3.2 0.76 1.98 Fish All Identified y Activity 1/h mile North 0.15 0.026 0.088 Nominal lower limit of detecticn (LLD) defined in HASL-300, pgs. D-08-01, 02 and 03.
a.
b.
Base on detectable measureme:, s only.
c.
Two samples per location.
d.
Includes background and transportation dose.
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