ML20133A464

Forwards Results of NRC TLD Direct Radiation Monitoring Around Cintichem Facility

ML20133A464
Person / Time
Site:	05000054, 07000687
Issue date:	12/20/1996
From:	Struckmeyer R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:	Mcgovern J CINTICHEM, INC.
References
NUDOCS 9612310104
Download: ML20133A464 (6)

Text

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December 20, 1996 Mr. James J. McGovern Plant Manager Cintichem, Inc.

PO Box 816 Tuxedo, NY 10987

SUBJECT:

RESULTS OF NRC TLD DIRECT RADIATION MONITORING AROUND THE '

CINTICHEM FACILITY l

Dear Mr. McGovern:

j The results of the subject monitoring for the third quarter of 1996 are provided in the i enclosure to this letter. An explanation of the results is provided as part of this enclosure.

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4 It was noted in previous reports that the azimuth and distance data for the TLD stations were incorrectly reported. The data have been corrected in the current report. These corrections do not affect the gross exposure data or net exposure rate data that were reported to you.

Please feel free to contact me if you have any questions regarding this program.

Sincerely, 3

ORIGINAL SIGNED BY:

d i Richard K. Struckmeyer Senior Radiation Specialist

Emergency Preparedness and Safeguards Branch j Division of Reactor Safety i

1 Docket Nos. 50-54;70-687 4

Enclosure:

As stated ,

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9612310104 961220 PDR P

ADOCK 05000054 PDR

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J. J. McGovern 2 cc w/ encl:

J. Adler, Manager, Health, Safety, and Environmental Affairs F. Morse, Project Manager, Decommissioning E. Abelquist, ORISE Dr. W. Vernetson, TRTR Dr. P. Merges, Director, Bureau of Radiation, NYS-DEC Rita Aldrich, Principal Radiophysicist, Radiological Health Unit, NYS-DOL Joseph J. Ribando, Town of Tuxedo Supervisor ,

Charles S. Warren, Robinson, Silverman, Pearce, Aronsohn and Berman  :

EPA Region II

, State of New York i

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i s

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i J. J. McGovern 3 Distribution w/ encl:

Region i Docket Room (with concurrences)

N. Orlando, NMSS (OWFN 5 E2)

T. F. Dragoun, DRS R. Struckmeyer, DRS S. Weiss, NRR (OWFN 11 B20)

V. McCree, OEDO (OWFN 17 G21)

D. Screnci, PAO l l

PUBLIC  !

Nuclear Safety information Center (NSIC)

DRS Files i

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DOCUMENT NAME: A:\CINT5054.963 To suceive a copy of this darument,indicase la the bas: *C' 5Cgwithmn anachmem/ enclosure *E* = Copy with stachmem/esiasws *N* = No copy 0FFICE RI/DRS l# $lhgS l l NAME RStruckmeyer##R Rhimig DATE 12/19/96 137s4 /96 0FFICIAL RECORD COPY

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CINTICHEM TLD Direct Radiation Environmental Monitoring For the period 960620-961009 112 Days Field Time: 89 Days l 1

Location Gross Net Exposure Rate Hist. Range NRC Azimuth /Dist Exposure (mR) (mR/Std. Qtr.) Net Exp Rate Sta (Deg)/ (Mi) +-Rda; Tot. +-Rda; Tot. +-1 Std Dev i 150 3.0 20.1 +- 0.6; 3.0 20.3 +- 0.6; 4.0 16.1 +- 1.1 2 140 2.1 14.9 +- 0.4; 2.2 15.1 +- 0.5; 3.5 14.0 +- 0.9 3 133 1.1 19.7 +- 0.6; 3.0 19.9 +- 0.6; 4.0 16.9 +- 1.5 4 120 0.5 23.6 +- 0.7; 3.5 23.8 +- 0.7; 4.4 20.0 +- 1.6 5 60 1.1 21.6 +- 0.6; 3.2 21.9 +- 0.7; 4.2 22.8 +- 1.5 6 345 1.1 17.4 +- 0.5; 2.6 17.6 +- 0.6; 3.7 17.6 +- 1.1 7 60 0.1 19.3 +- 0.6; 2.9 19.5 +- 0.6; 3.9 19.1 +- 1.7 8 10 0.2 16.5 +- 0.5; 2.5 16.7 +- 0.5; 3.6 17.8 +- 1.6 9 230 0.8 17.1 +- 0.5; 2.6 17.3 +- 0.6; 3.7 16.9 +- 1.0 10 200 1.4 18.1 +- 0.5; 2.7 18.3 +- 0.6; 3.8 18.0 +- 0.9 '

11 225 2.8 17.0 +- 0.5; 2.5 17.1 +- 0.6; 3.7 16.5 +- 0.7 12 80 2.1 19.1 +- 0.6; 2.9 19.3 +- 0.6; 3.9 16.5 +- 1.8 13 45 5.4 16.8 +- 0.5; 2.5 17.0 +- 0.6; 3.7 16.5 +- 1.0 14 10 6.2 15.8 +- 0.5; 2.4 16.0 +- 0.5; 3.6 16.9 +- 1.1 15 358 3.3 16.4 +- 0.5; 2.5 16.6 +- 0.5; 3.6 16.4 +- 0.9 16 315 5.0 17.7 +- 0.5; 2.7 17.9 +- 0.6; 3.8 17.4 +- 1.2 17 265 4.0 15.2 +- 0.5; 2.3 15.4 +- 0.5; 3.5 15.1 +- 0.8 18 235 6.7 16.3 +- 0.5; 2.4 16.5 +- 0.5; 3.6 17.1 +- 0.7 19 235 6.7 15.5 +- 0.5; 2.3 15.7 +- 0.5; 3.5 16.6 +- 0.6 20 235 6.7 16.4 +- 0.5; 2.5 16.6 +- 0.5; 3.6 16.7 +- 0.9 -

Transit Dose = 0.0 +- 0.2; 2.6 l

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CINTICHEM For the period 960620-961009

TLD Direct Radiation Environmental Menitoring

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Azimuth Ave. Expor,ure Rate Number (degrees) (mR/Std.Qtr.) +- Std.Dev. In Group 348.76 - 11.25 N 17.2 +- 0.9 2 11.26 - 33.75 NNE 15.7 +- 0.4 2 I 33.76 - 56.25 NE 17.0 +- 0.0 1 56.26 - 78.75 ENE 19.3 +- 0.0 1 3

78.76 - 101.25 E 19.7 +- 3.0 2 ,

101.26 - 123.75 ESE 20.1 +- 2.8 4 123.76 - 146.25 SE 17.5 +- 1.1 2 146.26 - 168.75 SSE 16.2 +- 1.6 2 168.76 - 191.25 S 20.3 +- 0.0 1 191.26 - 213.75 SSW No Data +- No Data 0 1

213.76 - 236.25 SW No Data +- No Data 0 236.26 - 258.75 WSW No Data +- No Data 0 258.76 - 281.25 W No Data +- No Data 0 281.26 - 303.75 WNW No Data +- No Data 0 303.76 - 326.25 NW No Data +- No Data 0 326.26 - 348.75 NNW No Data +- No Data 0 1

Distance From Ave. Exposure Rate Number Reactor (miles) (mR/Std.Qtr.) +- Std.Dev. In Group 0-2 17.7 +- 2.8 4 2-5 18.4 +- 2.4 11

>5 18.1 +- 2.0 2 Upwind control 16.3 +- 0.5 3 O

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j Data Analysis

The analysis of the data for the third quarter indicated that the result for the TLD at location number 1 was outside the range that is normally expected for that location. A net result is considered to be within the expected range ifit is within plus or minus three times the standard l i deviation of the historical mean. The " historical range" column on the first page of data for the

site shows the mean and one standard deviation for each TLD location. The result for any  ;

j panicular location may be within, above, or below this range.  ;

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The NRC TLD Direct Radiation Monitoring Network is intended to aid in the assessment of the  ;

radiological impact of an unusual condition, such as abnormally large releases of airborne  ;

j radioactive material, but it will not be the primary indicator that releases have occurred.

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There can be many possible explanations for atypical results at any location that have no relation-to the monitored facility. Unfortunately, it is often difficult to obtain the information necessary ,

to fully explain such results. For this location, no obvious causal agent was found that would l

account for the result outside the expected range. The inventory of radioactive material '

remaining on site is insuffic'ent to cause an atypical TLD result by means of an airborne release.

However, the data for this location, as well as all other locations around the site, will be  !

reviewed in subsequent quarters. '

L Weather is an example of a causal agent that could influence TLD results. The amount of naturally occurring radon and its daughter products in the lower atmosphere is a complex -

function of the wind, the amount of precipitation, and the resultant saturation of the ground with rain water (or coverage by ice or packed snow). The higher concentrations of radon that  ;

sometimes occur as a result of a combination of weather-related circumstances can give rise to TLD results that are somewhat higher than normal. Some of these could fall slightly outside the l expected range.

Systematic uncenainties, most notably the calibration uncertainty, could influence the' data by  !

introducing a bias in the overall results. Some of the net results that otherwise would have been i near the limit of the normal range could therefore fall slightly outside this range. 2 In general, the gross exposure data for the affected TLD were consistent with previous quarters, ,

while the transit dose was lower than normal (the estimate of transit dose was 0.0 i 2.6, where l the latter number is the total uncertainty, random plus systematic). Since the transit value is l subtracted from the gross exposure to arrive at the net exposure rate, a lower transit dose would  ;

cause the net exposure rates to be larger. Therefore, a net result that would have been near the  ;

limit of the normal range can be slightly outside this range. This is the most likely explanation  !

for the observed result.

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