ML19224B136
| ML19224B136 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/19/1977 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 1605, TM-0074, TM-74, NUDOCS 7906140092 | |
| Download: ML19224B136 (10) | |
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DOCUMElfr NO:
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f OF DOCUMENT PROVIDED BY COPY MADE ON METROPOLITAN EDISON COMPANY.
Wilda R. Mullinix, NRC 7906140092 188 235 e
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I605 Revision 4
4' "' 7 7 CONTROLLED COPY THREE allLE ISLAND NUCLE AR STATION MASTER COPY TATION S
HEALTH PHYSICS PROCEDURE 1605 C PORTABLE AIR SAMPLING FOR RADI0 ACTIVE PARTICULATES 3
C /
Table of Effective Pages Pace Date R evision Pm Date Revision Pace Date R evision 1.0 04/19/77 4
26.0 51.0 20 04/19/77 4
27.0 52.0 3.0 01/29/75 2
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29.0 54.0 5.0 01/29/75 2
30.0 55.0 6.0 01/29/75 2
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1605 Revision 4 04/19/77 THREE MILE ISLAND NUCLEAR STATION STATION HEALTH PHYSICS PROCEDURE - 1605 Portable Air Sampling for Radioactive Particulates 1.0 PURPOSE The purpose of this procedure is to describe the equipment and procedure for the collection of in-plant air samples.
2.0 DISCUSSION The air survey is an evaluation of the concentration of tir-borne r;dioactivity present in any area.
Periodic air surveys will be made in the clean and controlled areas at frequencies dependent on the type of area, its use, its potential hazard, or whenever airborne radioactivity conditions are uncertain.
3.0 REFERENCES
3.1 Radiological Health Handbook 3.2 Radiation Protection Manual (Administrative Procedure 1003) 3.3 Richmond Laboratories Inc. (R.L.I.) Catalogue 3.4 CP 1958, Gamma Spectrometry 4.0 EOUIPMENT A.
At Sampling Point 1.
Staplex with G-5 filter head, staplex with impactor or RLI cart mounted air sampler.
2.
G-5 filters or equivalent filters.
3.
Stainless steel planchet with silicone grease applied.
4.
Stop watch.
j 5.
Coin envelopes.
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At Counting 'oint 1.
Appropricte beta counting apparatus 188 237 2.
Appropriat? alpha counting apparatus l.0
1605 Revision 4 04/19/77 3.
Stainless steel planchet.
4.
Sample report forms (see Form 1605-1 attached).
5.
Geli/MCA Counting System.
5.0 OPERATING INSTRUCTIONS 5.1 Staplex Air Sampler With Impactor 5.1.1 On a stainless steel planchet put a small amount of silicone grease, on entire surface of planchet and wipe with a kimwice until a, licht film remains.
5.1.2 Place the planchet into a coin envelope and proceed to the area to be sampled.
5.1.3 Remove the planchet from the coin envelope and place onto the impactor.
Place the greased side of the planchet on the intake nozzle of the impactor.
5.1.4 Start the.staplex air sampler and stop watch simultaneously, run the air sampler for the time posted on the air sampler to 6
get a volume of 4 x 10 cc.
iMTE:
On occasions planchet may have to be held against the nozzle of the sampler until the sampler is started.
5.1.5 Stop the air sampler after the specified time allotment (each air sampler has a different time allotment posted).
5.i.6 Place the planchet into a coin envelope, labeled with the appropriate data (time, date and location) and return to the H.P. Lab.
1 5.1.7 Count, calculate and record the air activity as 'per 5.4 through
^
5.6.
5.2 Staplex Air Sampler with G-5 Filter or Equivalent Filter Attaghgegt } } g 2.0 a
HPP 1605 01/29/75 Revision 2 5.2.1 Place the G-5 filter or equivalent filter into a coin envelope and proceed to the area to be sampled.
5.2.2 Remove filter from coin envelope and place into filter holder of the air sampler.
5.2.3 Start the air sampler and the stop watch simultaneously, run the air sampler for the time posted on the air sampler 6
to obtain a volume of 4 x 10 cc.
5.2.4 Stop the air sampler after the specified time allotnent (each air sampler has a different time allotment posted) 5.2.5 Remove the filter from the air sampler and place into a coin envelope and return to the H.P. Lab. Mark the coin envelope with the date, time and location.
5.2.6 Count, calculate and record the activity as per 5.4 through 5.6 5.3 R.L.I. Cart Mounted Air Samoler with G-5 Filter or Eouivalent Filter Head.
NOTE:
The R.L.I. cart mounted air sampler is utilized for long duration sampling periods and has an automatic timer so a stop watch is not needed.
5.3.1 Place the G-5 filter or equivalent filter in air sampler 5.3.2 Reset the automatic timer to a zero setting.
6.3.3 Start the air sampler.
5.3.4 Stop the air sampler remove the filter and place into a coin envelope, labeled with the appropriate time, date,
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sample duration, location and flow rate.
5.3.5 Count, calculate and record activity as per 5.4 through 5.6 188 239 3.0 O
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1605 Revision 4 04/19/77 5.4 Countino of Air Samoles NOTE:
Prior to counting sample wait 15 minutes from stop time on air sampler for all air samples.
5.4.1 Place sample into appropriate counter and count for 4 minutes.
5.5 Calculate Radioactivity Contentrations Using the Following Formula:
cc/m
= pCi/cc 6
(vol)(eff.)(2.22 x 10 )
cc/m =
Corrected counts / minute.
Corrected counts are determined by dividing total counts observed by counting time and subtracting background counts / minute.
Background is determined as per H.P.P. 1701 Vol =
Volume in cubic centimeters (For RLI's the volume is cc/ minute times time in.,inutes).
Eff. =
Efficiency of appropriata counter 2.22 x 106=
Constant for converting DPM to pCi.
5.6 If the corrected counts per minute (cc/m as per 5.5) are less than three times the square root of bzekground in c/m divided by background counting time, than the activity on the sample is recorded as less than minimum detectable activity (MDA) i.e. 4[BKG ilME (+)
BKG(CPM)
'3y If gross activity is found greater than 3.0 x 10-10 Ci/cc the sample may be counted, for identification of Radionuclides, 1
on the GeLi/MCA System in accordance with CP 1958.,
5.7 MDA Determination:
If the background for the GM were 13M8 24 0 c/m, the MDA, three times the square root of background in c/m divided by background counting time, is calculated as follows:
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4.0
HPP 1605 01/29/75 Revision 2
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13.2 MDA = 3 20
= 2.44 Example: Air sample taken with a portable air sampler is coanted for four (4) minutes.
The total counts are 56, background 13.2 c/m and efficiency 20%
56 + 4 = 14 14 - 13. 2 = 0.8 Since 0.8 CPM is smaller than 2.44 (MDA), activity on the filter is reported as less than MDA, or; 2.44
= 1.38 x 10-I2 pCi/cc 6
6 (4 x 10 )(.20)(2.22 x 10 )
Activity of t.ie air sample = <l.38 x 10~I2 uCi/cc 5.8 Enter information on sample form. (See Form 1605-1) 5.9 Return to H.P. Foreman for review and approval.
Example: A 4 Cu. meter air sample from a portable air sampler is counted for 4 minutes the total counts are 2757 background is 13.2 c/m the efficiency is '0%.
2757 + 4 = 689.25 689.25 - 13.2 = 676.05 676.05
= 3.80 x 10-10 pCi/cc 6
6 (4 x 10 )(.20)(2.22 x 10 )
b 188 241 5.0
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5 fa PORTABLE AIR SAMPLERS R.L.I. Cart-mot:nted Air Sampler Time to Run Type of Filters cuft 1 cuft cc/ min Volume for vol. 4 x 10' cc cc/hr Charcoal 3.25 28,317 cc 3.2 x 10* cc/ min.
4 x 10' cc 43 min. 28 sec.
5.5 x 10' cc/hr G-5 Filter 3.2 28,317 cc 0.1 x 10* cc/ min.
4 x 10' cc 44 min. 8 sec.
5.4G x 10' cc/hr Charcoal 3.1 28.317 cc 8.8 x 10* cc/ min.
4 x lO' ' cc 45 min. 34 sec.
5.28 x 10' cc/hr and G-5 Filter N
o STAPLEX Charcoaf 25 28,317cc 7.08 x 'd' cc/ min.
4 x 10' cc 5 min. 30 sec.
G-5 Filter 25 28,317cc 7.08 x 10 cc/ min.
4 x 10' cc 5 min. 30 sec.
5 Chs coal 15.2 28,317cc 4.30 x 10 cc/ min.
4 x 10' cc 0 min.18 sec.
5 and G-5 Filter CO C0 Bm N
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h-R.M.I CART-MOUNTED AIR SAMPLER 188 244
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