ML20052H106

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Public Version of Revision 4 to Emergency Plan Implementing Procedure 1004.31, Airborne Radioactivity Sampling & Analysis.
ML20052H106
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 04/24/1982
From: Nelson M, Toole R
GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20052H095 List:
References
0018W, 1004.31-01, 1004.31-1, 18W, NUDOCS 8205190384
Download: ML20052H106 (12)
v • d • e


Text

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'FOR USE IN UNIT I ONLY no4;#,4 i

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/ - 04/24/82 i

  • IMPORTANT TO SAFETY v NON-EWIROWENTAL IMPACT RELATED CObTTROLLED COPY FOR THREE MILE ISLAND NUCLEAR STATION UNIT NO.1 EMERGENCY PLAN IMPLEMENTING PROCEDURE 1004.31 AIRBORNE RADI0 ACTIVITY SAWLING AND ANALYSIS l

Table of Effective Pages e' [L % %'d Page Revision Page Revision Page Revision Page Revision I 1.0 2 2.0 2 3.0 2 4.0 3 5.0 3 6.0 3 7.0 3 i 8.0 3 l 9.0 2 l 10.0 2

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FOR USE IN UNIT I ONLY 1004.31 Revision 2 jn THREE MILE ISLAND NUCLEAR STATION

' iU UNIT NO.1 EERGENCY IWLEENTING PROCEDURE 1004.31 AIRBORNE RADIOACTIVITY SAW LING AND ANALYSIS 1.0 PURPOSE

The purpose of this procedure is to define the method of air sampling and analysis for Airborne Radioactivity in areas both in-plant and out-of-plant during an emergency.

The Radiological Assessment Coordinator is responsible for implementing this procedure.

2.0 ATTACHMENTS 2.1 Attachment I, Airborne Radioactivity Sampling and I-131 Analysis Data Sheet.

2.2 Attachment II, Iodine Air Sample Nomograph.

2.3 Attachment III, Particulate Air Sample Nomograph.

2.4 Attachment IV, Minimum Detectable Radioiodine Nomograph.  !

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3.0 EERGENCY ACTION LEVELS 3.1 This procedure shall be implemented at any time during any class of declared emergency, when a potential or actual release of radio-activity to the environment exists; or

  • 3.2 As directed by the Emergency Director, Radiological Assessment Coordinator or their designee.

l 4.0 EERGENCY ACTIONS INITIALS 4.1 Emergency Equipment Required to be available for use:

1 4.1.1 SAM-II/RD19 Detector Probe 4.1.2 Radeco H-809 Air Sampler 4.1.3 Stopwatch 1.0 FOR USE IN UNIT I ONLY

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F'OR USE IN UNlT I ONLY 1004.31 Revision 2

! 4.1.4 GY_130 Silver Zeolite Cartridge f

4.1.5 Particulate Filter 4.2 SAWLE COLLECTION FOR OUT-OF-PLANT AREAS l 4.2.1 For particulate and radioiodine sampling, insert an iodine cartridge (charcoal or silver zeolite) with the arrow in the direction of air flow and partic-ulate filter in the Air Sampler unit holder with the fibrous glass backing side of the particulate filter facing toward the sampler. The particulate filter must be upstream of the cartridge.

l 4.2.2 With the filters in place, set the flow selector j switch on the air sampler unit to variable and 1

adjust the flow so as not to exceed (2) CFM. Run i (L the sampler unit for sufficient time to obtain a l~ minimum of ten (10) cubic feet. Record the sample l

l time and volume on the data sheet. Periodically l check the air flow indicator while the sampl_r is running.

NOTE: A minimum of ten (10) cubic feet is required to  :
obtain an MDA of IE-8 uC1/cc. The larger the  :
sample, the lower the EA will be.  :

v 2.0 FOR USE IN UNIT I ONLY

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FOR USE IN UNIT I ONLY 10 , ,31 Revision 2 9

(s 4.2.3 To set up the Sam II, perform the following steps.

a. Check settings on the SAM-II unit to comply with the following table. Adjust settings as necessary:

SAM-II Operational Settings l Channel 1 Channel 2 I

1. Threshold 3.44 3.44
2. Window 0.40 0.40 1
3. + off- + off
4. in out in out
b. Adjust HV to 7.50
c. Set the Scaler display switch to "0N", Count l Mode to "2", "XI", " timed" .

(. ______________________________________________________________________

NOTE: This will set the SAM-II for a 2 minute count. For  :
high radiofodine sample count rates as indicated on  :
the count rate meter, lower counting times inay  :
be used.  :
d. Connect the detector to the front panel of the SAM-II.
e. Turn the power switch "0N" and the stabilizer "0N", and allow unit to stabilize for approxi-mately five (5) minutes.

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FOR USE (N UNIT I ONLY.

F'OR USE IN UNIT I ONLY 1004.31 Revision 3 4.3 SAMPLE ANALYSIS

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4.3.1 Prior to counting the first sample, count a back-ground with the SAM-II in set-up mode as defined in step 4.2.3. Count background whenever radiological conditions have changed or are suspected to have changed at the counting location. Count background after changing locations.

NOTE: If the SAM-II unit is stable and not located in the  :
plume or a high background area, the background count :
should be less than 50 counts per minute.  :

4.3.2 Label a coin envelope with the necessary infonna-tion, i.e., date, time, volume, location, and person taking i .,,.e. Then remove the sample cartridge and (I particulate filter from the air sampler unit, separate the filter disc from the radiofodine cartridge and place the filter disc in the coin envelope for later counting and analysis. Count and analyze in accordance with RCP 1605. Particulate air samples will then be saved for subsequent GeLi analysis at U-1 Rad Con Lab or the EACC.

NOTE: A more rapid determination of airborne particulate  :
radioactivity may be made using the AIRBORNE  :
PARTICULATE SAMPLE NOM 0 GRAPH, ATTACHMENT III.  :

4.3.3 Place the iodine cartridge in the SAM-II shield chamber, and count the sample for two (2) minutes.

(Or less if the high count rate is indicated for the k sample.)

4.0 FOR USE IN UNIT I ONLY l

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~ FOR USE IN UNIT I ONLY 1004.31 Revision 3

'o ____________________..._______________.._____________________... _____

(-  : NOTE: If problems are encountered with the Sam II while  :

counting, check the following:  :
1. Power supply and connections.  :
2. Physical damage and proper probe connections.  :
3. Adjustments and settings per 4.2.3.a.  :
4. Response to provided source.  :

4.3.4 Record the serial number of the SAM-II, counter factor (as indicated on the SAM-II), background count rate, and count time on the sample data sheet. (Att. I).

NOTE: The " Count Factor" posted on the SAM II incorporates  :
counting efficiency, geometry factor and activity  :
conversion factors.  :

4.3.5 After counting sample, record the iodine semple counts and counting time on the data sheet.

(. 4.3.6 Calculate the radioiodine activity by use of the data sheet or nomograph. If the gross count rate cf 1

the sample is low, (less than 2 X background) i calculate the Minimum Detectable Count Rate (PCR).

If the MDCR is greater than the sample count rate, use the MDCR for activity calculations and report the measured activity as less than this activity.

MDA for radiotodine samples may also be obtained by use of the Minimum Detectable Radiofodine Activity Nomograph ( Att. IV) .

k 5.0 FOR USE IN UNIT I ONLY

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F'OR USE IN UNIT I ONLY 1004.31 Revision 3 l

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(%  : NOTE: Analysis of all samples may be performed by use of  :

!  : the TMI unit 1 GeLi/MCA system in accordance with  :

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SCP 1958.3, the TMI-Unit 2 GeLi/MCA unit, or the'  :
GeLi/MCA unit operated by the Environmental  :
Assessment Section.  :
NOTE: A more rapid determination of radioiodine concen-  :
tration may be made using the AIRBORNE IODINE SAMPLE  :
NOM 0 GRAPH, ATTACHIENT II.  :

4.3.7 For dose calculations due to off-site radioactive i releases, refer to EPIP 1004.7.

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NOTE: If during sample analysis, the sample activity  :
exceeds the ability of the instrument being used,  :

.  : (i.e., high count rate), one or all of the following  : !

alternatives may be used as directed by the RAC:

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a. Reduce the sample volume  :

f  : b. Utilize different counting geometries  : l

c. Utilize counting instrumentation with lower  : I

(  : efficiency / sensitivity  :

l 4.3.8 Place all samples in separate plastic bags and label the samples with sample date, time, location and calculated activity and return all samples taken to l

the OSC and give to the Rad Con Coordinator.

4.4 In-Plant air sampling for Radioactive Gas shall be perfonned in accordance with RCP 1607 with care to problems expressed in the note below 4.3.7.

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1 6.0 l-FOR USE1N UNIT I ONLY

'FOR USE IN UNIT I ONLY 1cc.,31 Revision 3 4.5 In-Plant air sampling for Radioactive' Iodine shall be perfomed in

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accordance with RCP 1605 with care to problems expressed ,in the i note below 4.3.7.

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______________________......______4._____ .'___________________________

NOTE: A more rapid detemination of, radiof odine concen-  :

,  : tration may be made using the' AIRBORNE IODINE-SAMPLE :

l  : NOM 0 GRAPH, ATTACHMENT 11. 1 -

4.6 In-Plant air sampling for Radioactive Particulates shall be per- ,

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I fomed in accordance with RCP 1605 with care'to problems expressed -

in 4.3.7. ' 'T

NOTE: A more rapid detemination of airborne particulate  : y
radioactivity may be made using thc' AIRBORisE PARTIC ' : .

ULATE SAMPLE NOM 0 GRAPH, ATTACHENT III.  :

4.7 All air samples shall be handled in accordance with RCP 1605.1. ~ ~~

, 2 (I 4.8 Post accident sampling of reactor containmeat air shall be per- I ,

fomed in accordance with RCP 1631. Special consideration should '

be given to the potential for very high radiation and contamination I levels of samples and sampling equipment. s

CAUTION: Obtaining a reactor containment atmospheric sample ' '
after an accident may involve' high levels of gaseous :
and particulate activitv. Special precautions as  :
outlined in EPIP.1004.9 should be observed.  :

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m 5.0 FINAL CONDITIONS -

- - I-5.1 All samples taken after release has been teminated. ,

5.2 All monitoring teams ordered to re' turn to base.

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5.3 All sanples given to . radiological controls for analysis.

k 7.0 FOR USE IN UNIT I ONLY

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FOR USE IN UNIT I ONLY ,

, 1004.31 Revision 3 AIRBORN$ RADI0 ACTIVITY SAMPLING AND IODINE - 131 ANALYSIS DATA SHEET ATTACHENT I

[ Sample Collection Iodine Sample Counting

1) Time on , Time off 1) Serial No. of SAM-II Run Time min.

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2) S~ ample Flow CFM, 2) Counter Factor l
3) '

Vo'1ume= min x - CFM 3) Background counts

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(1) TIT l ,

4) Background count time min

! x 2.832 x E 4 cc/ft3= cc

5) Background count rate- -
4) Location: 2 + min = cpm (3) (4)

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5) Datc: 6) Sample Counts
6) Time: >
7) Sample Count Time min.

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7) Sampler Type: '
8) Sample Count Rate =

(( Serial No.: t min = cpm

_ (6) (7)

, 8) Collecteji by: -

9) Sample Net Count Rate (Net CPM)

~, - = cpm

> Sample (8) Bkgd(5)
10) Date and Time of Counting:

, , c' , 11) Counted by:

Iodine Activity = Net CPM s =

uCi/cc .

, (Vol;L (Counter Factor) l

= '"'

=

CPM uCi/cc l _ ( cc) ( )

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' MOCR = 3.3 x v'Bkgd. Count Rate . (NOTE: This is for 95 percent Confidence Level and is valid only if Bkgd Count Time and Sample Count Time both equal 2 minutes).

k = 3.3 x V GPM = CPM

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FOR US'E IN UNIT I ONLY

, - - . - . .--,-en. -n.,7,- - , , , - - - ,

d Sit CE.1OR USE IN ygET%1,, $$n 2 (Grono CPE-Bkg. CP}t) Note: This nomograph is to be used for Iodine 131

/ 6.10- air samples counted with a SAM II. This nomograph C

assumes an ave. counter factor of 7800 for SAM II's.

l3l Aig Samp e Volume Airborne Activity (Ft ). (m1 or ec) , (pCDb-5

-9 40-  ::

-1E3 ~*

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-2E3 -4 70- .1- -

4E3 -3 100* *2-
-7E3 .

.4--1E4 200_ , 7. -2E4 1.0;-

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-4E4 -,

400 -

'7E4

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-1ES 4 . 0- _3 700- 7 . 05-2E5 4 10 2 .,

-4E5 -3 20 -
-7ES

(\ 1000 - 40 --1E6

-2 2000 70 $- 2E6 100J - -1

~l E-7 4000 [7,

. -3 7000 "

-3 10000J

-2 20000 _ .

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, Instructions: Draw a line through Net CPM (A) ll 40000 - andAirSagg{eVolume(B)usingastraightedge -7 and read I Airborne Activity (C) on the line. -*

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.. s 100000 ;

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-1 E-9 FOR USE IN9. UNIT I ONLY i l l

. . . ATTACHHC3 III 1004.31 A AIRBORNE PARTICULATE SAMPLE NOM 0 GRAPH C RIvision 2g

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11a to ha Airbrrno Activity (Cross C.. )*.J l .!o.. part . . ir samples (uCi/ml) counced with an P3-14/HP-210 )

.lio Beta-Ca =na Count Race Meter. T,'g..

f ,s This comograph assumes a counting .

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l efficiency of 1%. .

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. ,,r INSTRUCTIONS: Draw a line through Net j, 7, CPM (A) and air sample volume (3) using w a straight edge and read airborne ac- {f l civity (C) on the line. J. w l

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FOR USE IN 2 UNIT I ONLY i

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FOR OSE IN UNIT *tceNY.Y MINIMUM DETECTABLE RADI0 IODINE ACTIVITY NOMOGRAPH n . Note: This nomograph is to be used for determining the minimum detectable activity of airborne iodine samples counted with the SAM II. This nomograph assumes a counter factor of 7800 for SAM II's. 1 Min. Detectable Activity (uci/ml)

A B Background CPM AirSampleVoluge [2E-8 (m1 or ec) (ft ) .

5, , 2 7E4 -

1ES - '

10 Z '4 5 1E-8 15, ,6

-9 9 2E5 -

20, . 8 .'8 E-9

- - '10 .7E-9

30. . "

4E5 40; .

15 .6E-9

.0 ,5E-9 50

'602 7ES -

80 '

1E6 -

. 0 100$ . ,

I 3E-9

INSTRUCTIONS l

Draw a line through background CPM (A) i and air sample volume (B) using a straight edge and read MDA (C) where the line intersects the right hand 2 E-9 scale.

FOR USE (N ' UNIT I ONLY

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