ML20041A562

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Public Version of Revision 3 to Emergency Plan Implementing Procedure 1004.31, Airborne Radioactivity Sampling & Analyses. Table of Effective Pages Encl
ML20041A562
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 01/21/1981
From: Nelson M, Ross M
METROPOLITAN EDISON CO.
To:
Shared Package
ML20041A547 List:
References
1004.31-01, 1004.31-1, NUDOCS 8202220290
Download: ML20041A562 (11)
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Text

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i FOR USE IN U'N1-f 1 ONLY , 1004.31 Revision 3 01/21/82 p IMPORTANT TO SAFETY

_ 140ll-ENVIR0llllENTAL IMPACT RELATED CO poe THREE MILE ISLAND NUCLEAR STATION UNIT NO.1 EMERGENCY PLAN IMPLEMENTING PROCEDURE 1004.31 AIRBORl4E RADI0 ACTIVITY SAMPLING AND' ANALYSIS Table of Effective Pages y .

Page Revision Page Revision Page Revision Page Revision 1.0 2 2.0 2 3.0 2 4.0 3 5.0 3 6.0 3 7.0 3 8.0 3 9.0 2 10.0 2

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' Date '

Document ID: 0018W 8202220290 820211 FOR LIRE IN UNIT I ONLY ~

PDRADOCK05000g

i 1

FOR USE IN LiNIi. I UNLY .

1004.31 Revision 2

'. .. THREE MILE ISLAND NUCLEAR STATION UNIT NO.1 EERGENCY IMPLEENTING PROCEDURE 1004.31 AIRBORNE RADI0 ACTIVITY SAlfLING AND ANALYSIS 1.0 PURPOSE The purpose of this precedure 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 Radiof odine Nomograph.  !

3.0 EMERGENCY 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.

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

4.1.1 SAM-II/RD19 Detector Probe l

! 4.1.2 Radeco H-809 Air Sampler i

4.1.3 Stopwatch

i FOR USE lhi UNIT i ONLY

FOR USE IN UNII I Un!LY 1004.31 Revision 2 4.1.4 GY-130 Silver Zeolite Cartridge 4.1.5 Particulate Filter 4.2 SAMPLE COLLECTION FOR OUT-0F-PLANT AREAS

~

4.2.1 For particulate and radiciodine 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.

4.2.2 With the filters in place, set the flow selector switch on the air sampler unit to variable and adjust the flow so as not to exceed (2) CFM. Run

( the sampler unit for sufficien't time to obtain a minimum of ten (10) cubic feet. Record the sample time and volume on the data sheet. Periodically check the air flow indicator while the sampler is running.

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

f

. OR USE IN UN!T ! ONLY

FOR USE IN UNII I Un!LY 1004.31 Revision 2 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 Channel 1 Channel 2

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

Mode to "2", "XI", " timed".

( __________________________________________________________..__________

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

/

l l

3.0 FOR USE IN UNIT i ONLY

FOR USE IN UNil 1 Un!LY 1004.31 Revision 3

/ 4.3 SAMPLE ANALYSIS 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 informa-tion, i.e., date, time, volume, location, and person taking sample. Then remove the sample cartridge and particulate filter froni the air sampler unit, separate the filter disc from the radioiodine 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 AIRBORWE  :
PARTICULATE SAMPLE NOM 0 GRAPH, ATTACHMENT III.  :

l ______________________________________________________________________

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 sample. )

4.0 -

1 OR USE IN UNIT I ONLY 1

FOR USE IN LiN1i 1 U^!LY ~

1004.31 Revision 3 p _____.._______________________________......____._____________________

VJ  : 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. 1).

NOTE: The " Count Factor" posted on the SO4 II incorporates  :
counting efficiency, geometry factor and activity  :
conversion factors.  :

4.3.5 After counting sample, record the iodine sample 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 of the sample is low, (less than 2 X background) calculate the Minimum Detectable Count Rate (MDCR).

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

MDA for radioiodine samples may also be obtained by use of the Minimum Detectable Radiciodine Activity Ncmograph ( Att. IV) .

' OR USE liU UNIT i 6NLY

p FOR USE IN UNIl'I UNLY .

1004.31 Revision 3 q , _ _____. _____..________________.______.______________________________

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

the TM1 Unit 1 GeLi/MCA system in accordance with  :
SCP 1958.3, the THI-Unit 2 GeLi/MCA unit, or the  :
GeLi/MCA unit operated by the Environmental  :

Assessment Section.  :

140TE: A more rapid determination of radioiodine concen-  :

tration nay be made using the AIRBORllE 10 DINE SAMPLE  :

HOM0 GRAPH, ATTACHMENT II.  :

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

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:  :
a. Reduce the sample volume  :
b. Utilize different counting geometries  :
c. Utilize counting instrumentation with lower  :
efficiency / sensitivity  :

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 the OSC and give to the Rad Con Coordinator.

l 4.4 In-Plant air sampling for Radioactive Gas shall be performed in accordance with RCP 1607 with care to problems expressed in the i

note below 4.3.7.

FOR USE IN 69 NIT I ON!._Y

FOR USE IN UNII I U!LY -

1004.31 Revision 3

/

4.5 In-Plant air sampling for Radioactive Iodine shall be perfomed in accordance with RCP 1605 with care to problems expressed in the note below 4.3.7.

A more rapid detemination of radioiodine concen-  :

110TE:

tration may be made using the AIRBOR11E 10DIllE SAMPLE  :

HOM0 GRAPH, ATTACHME14T II.  : .

4.6 In-Plant air sampling for Radioactive Particulates shall be per-famed in accordance with RCP 1605 with care to problems expressed in 4.3.7.

A more rapid determination of airborne particulate  :

110TE:

radioactivity may. be made using the AIRBORilE PARTIC-  :

ULATE SAMPLE Il0M0 GRAPH, ATTACHiEt4T III.  :

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

4.8 Post accident sampling of reactor containment air shall be per-fomed in accordance with RCP 1631. Special consideration should be given to the potential for very high radiation and contamination levels of samples and sampling equipment.

CAUTI0il: Obtaining a reactor containment atmospheric sample  :

after an accident may involve high levels of gaseous  :
and particulate activity. Special precautions as  :

outlined in EPIP 1004.9 should be observed.  :

5.0 FINAL C0tIDITI0tlS 5.1 All samples taken af ter release has been terminated.

5.2 All monitoring teans ordered to return to base.

5.3 All saaples given to radiological con rols for analysis.

FOR USE IN70 nit ! ONLY

FOR USE IN UNI 1. I U^!LY 1004.31 Revision 3 r3 AIRBORNE RAD 10 ACTIVITY SAMPLING AND IODINE - 131 ANALYSIS DATA SHEET ATTACHIENT I Samp1e Collection Iodine Sample Counting

1) Time on , Time off 1) Serial flo. of SAM-II Run Time min.
2) Sample Flow CFM, 2) Counter Factor '
3) Volume = min x CFM 3) Background counts (1) T2T
4) Background count time min x 2.832 x E 4 cc/ft3= cc
5) Background count rate-

^

4) Location: t min = cpm

! (3) (4)

5) Date: 6) Sample Counts
6) Time: 7) Sample Count. Time min.
7) Sampler Type: 8) Sample Count Rate =

! Serial No.: t mi n= cpm (6) (7)

8) Collected by: 9) Sample Het Count Rate (!!et CPM)

Sample (8) Skgd( 5)

10) Date and Time of Counting:

l 11) Counted by:

i i

Iodine Activity = Net CPM =

uCi/cc (Vol) (Counter Factor) l l = CPM =

uCi/cc

( cc) ( )

l MDCR = 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).

3.3 x V GPM

CPM 8.0 FOR USE IN UNIT I ONLY

". FO P USE IN U NI Q,CW'rrY A t *' 3 CPM IODINE AIR SAMPLE NOMOCRADM Revision 2 (Gross CPM-Bkg. CPM)

Note: This nomograph is to be used for Iodine 131 n 10- air samples counted with a SAM II. This nomograph C

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

131 20- M Airbo ne Activity (Ft 3) Sample Volume (m1 or cc) (pCi/mli

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- -9 40_ -1

-1E3 **

3 70- -2E3 -4

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4E3 -3 100- *2

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.4 ' 1E4 200_ ,7 -2E4

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700 - 7. --2E5 4 10 4'.

4E5 -3 r 1000- 20 -'-7ES I I

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10000 " _3 l

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20000 4 E-8

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Instructions: Draw a line through Net CPM (A) I' andAirSagg{eVolume(B)usingastraightedge 40000 - and read I

-7 Airborne Activity (C) on the line. -6

-s l 70000l ~'

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COR USE IN !fNiT I ONLY

FQR NET M USE 1%ddNhfECE@s Note: *his nc=ograph is : be

@IffNonocmu e E " 2)

A1 barne Ac::.vity (Gross P.M-3kg. C?M) used for particula:e air sa=ples (uCi/.1) coun:ed vi:h an PS.-14/EP-210 g

. io Be:a-Ga==a Count Rate Meter. 1.....,

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This ac=ograph assu=es a counting 1

. .is efficienev~ cf 15:;. 1: 7 14

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. 3. 3 o 3 Air Sa=ple Volume

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