ML20074B081

Procedure HPO/CO-3, Airborne Activity Survey Techniques, Including Techniques for Constant Air Monitors,Portable Fixed Filter Samplers & Charcoal Cartridges

ML20074B081
Person / Time
Site:	Peach Bottom, Limerick, 05000000
Issue date:	05/16/1983
From:	PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20071F431	List: ML20071F428 ML20071F446 ML20074B077 ML20074B081 ML20074B084
References
HPO-CO-3, NUDOCS 8305180426
Download: ML20074B081 (15)

Text

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p PHILADELPHIA ELECTRIC COMPANY PEACH BOTTOM UNITS 2 6 3 . .

HP0/CO Airborne Activity Survey Techniques _ ,

Purpose:

This procedure gives general methods for obtaining air samples and for evaluating airborne activity concentrations. Due to the nature of job, for which the survey is done, location of survey, and plant conditions, parts

of this may be' changed at the discretion'oif the pers'on making the survey as long

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as the change does not jeopardize safety.

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References:

4 HPA-2 yA2a,, 7 Apparatus:

1. Air samplers or constant air monitors, as required.

2. Filter paper and charcoal cartridges, as required.

3. RCA sheet PECo Form No. 192-21268 or later revision, l

i Procedure:

1. Air samples may be taken on a fixed filter, a moving filter, or a charcoal cartridge in combination with a fixed filter. Samples may be taken by portable grab samplers or by continuous air monitors. Air sampics may be taken to, determine airborne beta

.l activity, beta plus alpha activity, . radio, active iodine coricentration

2. Constant air monitors are used to sample and measure directly the airborne activity levels during long term' jobs, on jobs where l frequent fluctuations of airborne activity are expected, and in general plant areas where it is necessary to document and alert personnel to increases in airborne levels. These units collect activity on a fixed or moving filter for almost immediate ana2ysis by internal detectors.

3. Portable filter, paper samplers are used to take short, high

- volume samples or- long, low volume samples. These filters are l analyzed in the counting room for gross alpha, gross beta, or specific radionuclid activity. The min,imum. sample volume. for alpha' g ~ activity should be 30 ft

4. Charcoal cartridges are used with low volume samplers to sample for , ,

radioactive iodine. A piece of filter paper is placed ahead of the charcoal l

cartridge to minimize the amount of particulate activity collected on the i Charcoal.  !

8305180426 830516 PDR ADOCK 05000352 E PDR i

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.5. The following are general recommendations for taking air samples: .

a. Identify, flow direction where necessary and install the il sampling medium in the sampler to prevent damage to the medium. Check carefully that the sampling medium is l!

properly positioned so that there will be no leakage around it. If air bypasses the medium, the airborne ,

activity measured will be lower than the true airborne activ'ity.  :

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b. Set up the sampler so that the sample will be as representative as-possible of the air that personnel will be or are breathing.

.c. Record the time and flow rate at the-beginning (if sampler has flow meter, if not record the calibrated flow marked on

, sampler) and at the end of the, sampling period.!

.d. Place the sample medium in an envelope if necessary for transfer to_the counting room. Being careful not to dislodge any deposited activity from the sample.

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For detailed air s'ampling procedures for specific types of '

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air ~ samples see the following.  ;

Constant Air Monitor -HP0/CO-3a )

I Portable Fixed Filter Sample -HP0/CO-3b ~

Charcoal Iodine Sampling. -HP0/CO .c .

.I' i -7. Analysis of gross beta on filter paper $

a. Determine the net cpm per HPA-2 or 2a -

b. Determine the uCipm3 from the following equation: .. .

uCi/cm 3 Net CPM

• Counter eff. x 6.0 x 101u x Volume (ft 3). , , , , , , _

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equipment used.

g d. Record the appropriate data on an " Air Analysis Record" (Data Sheet IIPO/Co-3) , a " Radiation -

I Contamination - Airborne Survey" PECo Form 196-21268,or a CAM Inspection Report (Data Sheet

! j HP0/CO-3a).

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,! 8. Derivation of 6.0 x 1010 conversion factor l l

2.22 x 106 dpm 2.83 x 10 4 cm3 h

[ = 6.28 x 1010 dpm cm3 uCi l  ; M)l '

uCi ft 3

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!' .95 filter eff. 6.28'x 1010 dpm'c53~i6.0xId10dpm cm'3' (constant) uCi fto uCi ft 3

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Air Analysis Data Sheet Work Loc

• ion RWP Number Work Conditions Counting Date Sample Collection Date Time Flow Rate (cfm)

Type - Ili Vol Low Vol Lapel (Circle one) Off Scrial No. On Medium a Particulate Charcoal Sample Vol.

(Circle Medium used) Sample Duration Ave. Flow Rate Technician min. X cfm = ft3 Beta Alpha (circle onel Time from the end of sampling to the beginning of counting Counting equipment and ident. no.

Gross Counts Length of count (min)

Gross epm - 91 i, & t'i Background cpm-(1) Net cpm (2) Counter eff.

(3) Volume (ft3) l (4) Activity (uCi/cm )3 l

(1)

Net CPM = (4) tiCi/cm3 i Counter Eff x Vol(Ft)J x 6.0 x 1010 (2) (3) f l

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+2,tuS ein . , ', SAMPLE ONLY

, . j .CRIC1NAL ,

fBAPS- R ADI ATION - CONT AMIN ATION - AIRBORNE SURVEY

.P. N O. RECORD - UNIT 2 O - UNIT 3 O SURVEY NO.

TIME - SURVEY BY-DATE -

AR EA -

REASON -

- RADI ATION - Ser! 1a "1 No.

BETA UAMMA NEUTRUN5 ~101AL '

MRAD /HR. MR/HR. MREnf/HR. MREM /HR. DISTANCE ITEM

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instrumenc s CONTAMIN ATION - Serial No. - Af RBORNE - Instrument Serial No.

^ AVERAGE FLOW RATE COUNTER BETA + GAMMA ALPHA ITEM ppy/100 cm2 3pMfico em2 START -

FT3/ MIN, EFF.

STOP - ,

1D.

b ' GROSS l

GROSS BKGD NET O

. COUNTS

= CPM (-) CPM = CPM lo. +

O COUNTING G. ,

TIME MIN 3.

B . NET. CPM = uCi/cm 3

6. EFF x VOL(FT)3 x 6.0 x 101u COUfffERr .__

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31 ISUTOPE(S) 32 . _ . . _ . . _ . . _ ._._-...,... _

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REMARKS. i

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HP0/CO-3a

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~PEAC li BOTTOM UNITS 2 63 l HP0/CO311 ""*'Ahborne Ac tivity Survey Techniques - Constant Air Monitors'

""7 ttrp o s e :

This procedure describes the techniques for operating constant air monitors.

References:

' ' ~

1. HP0/CO-3 , , .

2. NMC Instruction Manual for AM-2B, ANI-22P, AM-22I, a'nd AM-3B CAM'S Apparatus:

1. NMC Model AM-2B CAM (CRM-SIM) CAM

2. NMC Model AM-22P CAM (CRM-SSM) CAM

3. NMC Model AM-22I CAM (CRM-54M) CAM -

4. NMC Model AM-3B CAM (CR*f-51M) CAM

5. Filter paper discs, 2" dia., as required

6. Charcoal cartridges, as required

7. Filter paper rolls for moving filter CAM W 1 ro11/30 days of operation)

Procedure:

1. General Recommendations for Startup and Use of a CAM

a. Keep a CAM as close to the area being sampled as possible to minimize hose lengths but in an area where the radiation level

! is less than 10 mR/hr. Place sampling hoses such that all l bends are as gradual as possible.

b. Periodically check that the blower is properly lubricated. See manufacturer's manual for filling instructions.

c. Check that recorder pens are inking, properly. See manufactur,er's manual for filling instructions.

d. Check that the MAS'TER 'and" "HIGli VOLT AGE switches are in the OFF position.

e. Plug the pc.wer cord into a 115VAC supply and turn the MASTER l switch ON.

f. Turn the HIG4 VOLTAGE s wi t ch ON . ON MODEL AM-22P CAMS, CONNECT l

AND START DETECTOR COUNTING GAS FLOW BEFORE TURNING HIGH VOLTAGE ON,

g. Install the sample medium as described in the specific procedure l for the type of cam in sect'ioris 2,3,4, or 5.

h. Turn the BLOWER switch ON.

i. Mark on the recorder chart the date and time a unit is put into service.

ON INITIAL SETUP AND CALIBRATION Ds A CAM, LET IT WARM UP FOR A LEAST 24 Il0URS BEFORE MAKING ANY ADJUSTMENTS OR CALIBRATIONS.

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HP0/CO 3a W ~

Pago 2 of 6

j. Check that time sample flow rate indicated by the magnehelic gauge agrees with the posted flow rate within 1 15%. If it pV does not, contact HPSC supervision for adjustment.

k. Turn the INPUT MODE switch en to TEST. Check that the appropriate count rate meter reads 3600 cpm + 10%. If it does not, report discrepanc y to HPSC supervision. Return switches to.th,e OP position. ,

1. Recorder tracings for all CAMS except the Model AM-3B are interprepted as follows:

1) On fixed filter CAMS use the family of curves (figure HP0/CO-3a) to convert change of recorder indications (B pen only) to ACi/cc

2) On the moving filter CAM Model AM-3B (CRM-54M), the recorder reading (in epm) is multiplied by the conversion factor posted on the CAM to obtain#Ci/cc

m. When the sample medium is removed from a CAM, place it in an envelope and identify it by location, time on and off, and flow rate. Take it to the ccunting. room, if gross Beta and/or Gamma Isotopic analysis is required. Install new sample medium and mark the recorder chart with the date 'and time of sample change.

IF THE COUNT RATE METER AND RECORDER REMAIN UPSCALE WHEN TliE SAMPLE MEDIUM IS CHANGED, CHECK THAT THE CHECK SOURCE IS IN THE "OUT" POSITION.

IF THE MONITOR STILL REMAINS UPSCALE, CHECK Tile RADIATION LEVEL AROUND CAM. IF IT IS LESS THAN 10 MR/HR, THE SAMPLE HOLDER MAY BE CONTAMINATED.

CAREFULLY WIPE THE SURFACES OF THE SAMPLE HOLDER AND THE INTERIOR SURFACES OF THE SHIELD HOUSING USING A CLOTH NOISTENED WITH ALCOHOL. DO NOT WIP,E THE SURFACE OF THE DETECTOR. IF DECONTAMINATION DOES NOT REDUCE THE RESPONSE OF THE CAM, REPORT THE DISCREPANCY TO HP6C SiiPERVISION.

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n. Make an inspection of all ope' rating CAMS at least once every 10 days. Record. inspection results on the CAM Inspection Report Data Sheet HP0/CO-3a.

o. The filter medium should be counted for Gross Beta activity and possibly be Gamma scaned per llP0/CO-3 step 7 when unusual changes are detected in the pen traces.

l 2. Model AM-2B @RM 51M) CAM This monitor uses a fixed filter, 2" in diameter, to collect particulate activity and a beta scintillation detector to measure the activity.

a. The filter paper is changed as follows:

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1) Turn BLOWER switch (inside hinged top of CAM) to 0FF.

2) Simultaneously pull and turn the filter assembly plug to slide the plug out of its shield.

3) Remove the retaining ring from the assembly to release the filter paper.

4) Identify the sample removed.

5) Install a new filter paper on the screen support with the " soft" side facing away from the screen.

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Install the retaining ring to hold the filter paper in place.

Return the filter assembly plug to its shield.

l 8) Turn the BLOWER switch ON.

! 9) Mark recorder chart with the date and time of filter change.

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• F Pcge 3 of 6

3. Model AM-22P (CRM-SSM) CAM This monitor uses a fixed filter, 2" in diameter to collect 4EF particulate activity and a gas flow proportional detector to measure both alpha and beta activity.

a. Install counting gas and adjust the flow rate as follows:

1) Connect a cylinder of P-10 gas equipped with a two stage regulator to the monitor.

2) Turn the gas flow control on the detector assembly 0FF.

3) Adjust gas pressure with the cylinder regulator to between 5 and 10 psig.

4) Adjust the gas flow control to give a flow of about 10 bubbles per second and hold for about 10 minutes. Reduce the flow to 1 or 2 bubbles per second for normal operation.

NEVER INCREASE THE GAS FLOW MUCH IN EXCESS OF 10 BUBBLES PER SECOND BECAUSE THE BACK PRESSURE WILL STRETCll THE DETECTOR WINDOW.

b. Change the filter paper when required in accordance with section 2a.

4. Model AM-2 2I (CRM-54M) CAM This monitor uses a fixed filter, 2" in diameter, to collect particulate activity and a beta scintillation detector to measure the activity. The sample stream also passes through.a charcoal cartridge for radioiodine collection which is measured,by, a Na I ,

detector. '

a. Change the filter paper when required in accordance with section 2a.

b. Change the charcoal cartridge as follows:

1) Turn BLOWER switch (inside hinged top of CAM to 0FF IF Tile 10 DINS COLLECTOR ASSEMBLY I'S REMOVED WITil THE BLOWER ON , Tile CilARC0AL CARTRIDGE MAY BE SUCKED FROM THE FILTER ASSEMBLY AND REMAIN INS I DE Tile SHIELD.

2) Simultaneously pull and turn the iodine collector assembly plug to slide the plug out of its shield.

3) Remove the charcoal cartridges from the collector assembly.

4) Identify the cartridge removed.

5) Mark the flow direction on a new cartridge and install it in the assembly, checking that the cartridge seats in the I assembly.

6) Return the iodine assembly plug to its shield.

7) Turn the BLOWER switch ON. i

8) Mark recorder chart with the date and time of filter change. I

5. Model AM-3 B (CRM-51M) CAM l This monitor uses a moving filter to collect particulate activity and an end window GM detector to measure the activity.

a. The filter paper is changed as follows:

1) Turn BLOWER switch (inside hinged top of CAM) to 0FF.

2) Tilt the front shield section completely forward.

3) Lift the spring loaded idler wheel, located behind the capston plates, until it locks in a disengaged position.

4) Remove the used roll of filter paper from the take-up

(~) (right) spindle.

A/ 5) Place the new roll of paper on the supply (left) spindle. l l

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6) Unwind about two feet of paper.

7) Slide the filter paper past the face of the detector

~T and close the shield assembly.

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8) Grasp the filter paper on each side of the shield assembly and move the filter paper until it slides freely in the slot.

9) Slide the paper between the capstan and idler roller and release the idler arm so that it moves against the paper.

10) Tape the end of the paper to the take-up spindle.

11) Turn BLOWER switch ON.

12) Check that the switch on the front of the filter paper drive box is in CONTINUOUS.

13) Push the RAPID-ADVANCE button and check that the filter paper advances through the shield assembly slot and that the take-up mechanism removes the slack from the filter paper and maintains a tight, smooth feed to the take-up spindle.

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e i PEACH BOTTOM ATOMIC POWER STATION CAM Inspection' Report-Data Sheet HP0/CO-3A l l CAM CAM Location On Off cpt ,H.V. Test Resp < Cxcents :

E a u a u s u kte/ Time Date/Timin cl/cc

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pactivitypCi/cc ,

Not cpu (frcn HPA-2 or 2a)  :

(fixed filter CAlis) (Sample Time-hrs)(Flow-efm)(60 min /hr)(Counter Eff. )(5 97P10')

1. Net cpm + ( hrs x cfm x 60 min /hr x Eff. X 5,97 P10)

Net cpn + ( hre x cfm' x 60 min /hr y Eff. x q_g,,P10)

Net epm + ( hrs x cfm x 60 min /hr-g Eff. x ,,P10)

Net epm + ( hrs x cfm x 60 min /hr X Eff. X q _ n,7 P10)

Net epm + ( hrs x cfm x 60 min /hr x Eff.X y n,,P10)

Net epm & ( hrs x cfm x 60 min /hr X Eff. X Q.P10)

Net epm + ( hrs X cfm W 60 min /hr x Eff. X 5,o7.P10)

Net enn + ( hrs x cfh x 60 min /hr i Eff. X 5,97 P10)

Net epm + ( hrs % cfm x 60 min /hr i Eff. X 5.97 P10) g Net cpn + ( hrs X cfm x 60 min /hr x 1:ff. x5.97 P10) itmarks:

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Page 1 of 2:

-- 9 PillLAD iLPillA ELECTRIC COMPANY PEACll BOTTOM UNITS 2 AND 3 HP0/CO-3b - AIRBORNE ACTIVITY SURVEY TECHNIQUES -

PORTABLE FIXED FILTER SAMPLERS PURPOSE:

This procedure describes the techniques for operating the portable fixed filter air samplers used at Peach Bottom.

REFERENCES:

1. HP0/CO-3 APPARATUS:

1. Low Volume Air Sampler

2. Staplex Hi Volume Air Sampler

3. Disc filter paper, 2" or 4" diameter, as required PROCEDURE:

1. Low Volume Air Sampler

.. a. To install a sample filter, remove the retaining ring from the sample holder and place a piece of 2-inch (S0 mm) diameter or 47 mm diameter filter paper in the filter holder. Be sure the filter is centered in the holder.

b. Reinstall the retaining ring so that it holds filter paper in plaec.

c. Locate the sampler as required and position the sample holder as necessary. (Some samplers have sample .,-

holders that are adjustable from 4' above the floor to 7' above the floor.)

, d. *1 urn the pump on and inspect filter for tears and I

leakage paths.

e. Record date, time, flow rate (listed on the sampler, or read the flow meter if the sampler has one) sample location,and initials of technician on the envelope which will be used to transport the sample medium to the counting room.

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f. The Rade Co. " Goose-Neck" low volume air samplers have vacuum gauges that measure the vacuum at the pump,

" Vacuum Pump flead", and the vacuum downstream of the filter, " Paper". The filter medium must be changed before the paper equals the vacuum pump head.

g. Record the time at the end of the sample period and the flow meter reading if the sampler has one ion the transport envelope.

h. Turn the sampler off, remove the filter paper, and place it in the transport envelope.

i. Analyze the sample in accordance with HP0/CO-3, Step 7.

2. -Staplex Air Sampler (Hi Volume)

a. Locate the sampler as required.

b. Install a filter, if necessary, by removing the outside ring, placing a 4" diameter filter paper, on the filter support, and reinstalling the outer ring on the sampler,

c. Turn the sampler on and inspect filter for tears and leakage paths.

d. Record the date, time, flow rate (listed on sampler),

sample location, and the initials of the technician on the envelope which will be used to transport the sample medium to the counting room,

e. Record the time at the end of the sample period on the transport envelope,

f. Turn the sampler off, remove the filter paper, and place it in the transport envelope.

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g. Analyze the sample in accordance with HP0/CO-3, Step 7.

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PHILADELPHIA ELECTRIC COMPANY PEACH BOTTOM UNITS 2 AND 3 HP0/CO-3c - AIRBORNE ACTIVITY SURVEY TECHNIQUES - CHARC0AL CARTRIDGES PURPOSE:

This procedure prescribes the techniques for collecting radioiodine air samples.

REFERENCES:

1. HP0/CO-3 APPARATUS,:

1. Low Volume Air Sampler

2. Charcoal cartridges, as required

3. Filter papaer discs, 2", as required PROCEDURE: ,

s' 1. Low Volume Air Sampler

, a. If installed, remove the filter paper holder from the sampler and install the filter paper and charcoal cartridge holder.

b. Remove the protective covering from a charcoal cartridge and mark the cartridge to indicate the direction of. air flow through it.

c. Remove the retaining r,ing from the filter holder on the sampler and' place the cartridge in the holder. Check that the cartridge seats properly and that the cartridge is installed as the flow marking indicates,

d. Place a piece of filter paper on the surface of the holder and replace the retaining ring.

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e. Locate sampler as required and position sample holder as necessary.

(Some samplers have sample holders that are adjustable from 4' above the floor to 7' above the floor.)

f. Turn the pump on and inspect the filter for tears and leakage paths.

g. Record date, time, flow rate (listed on sampler or read the flow l

meter if sampler has one), sample location, and your initials on the envelope which will be used to transport the sample

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medium to the counting room.

h. The Rad 5 Co. " Goose-neck" low volume air samplers have vacuum gauges that measure the vacuum at the pump, " Vacuum Pump Head",

and the vacuum downstream of the filter, "APaper". The filter medium must be changed before the a paper equals the vacuum pump head.

i. Record time at the end of the sample period and the flow meter reading if the sampler has one, on the transport envelope.

j. Turn the sampler off, remove the filter paper and charcoal cartridge, and place them in the transport envelope.

k. Analyze the paper filter and charcoal cartridge in accordance with HP0/CO-3, Step 7.

J l

l l

l l

1 m