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Public Version of Revision 7 to Emergency Implementation Procedure EI-6, Estimate of Offsite Dose. Revision Sheet Encl
	ML20041A205
Person / Time
Site:	Palisades
Issue date:	01/11/1982
From:	; CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	;
Shared Package
ML20041A201	List: ML20041A204; ML20041A205;
References
	EI-6-01, EI-6-1, NUDOCS 8202190272
	Download: ML20041A205 (16)
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Emergency Implementation Procedures

_ Revision Sheet Q$)

Estimate of Offsite Dose, EI-6 TITLE:

Revision ,

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EMERGENCY IMPLEMENTATION PROCEDURE EI-6 ESTIMATE OF OFFSITE DOSE Rev 7 1.0 PERSONNEL RESPONSIBLE 1.1 The Chemistry / Health Physics Superintendent or the Plant Health Physicist is responsible for the implementation of this procedure.

1.2 Members of the Radiation Protection Group will complete parts of this procedure as directed by the Chemistry / Health Physics Superintendent or the Plant Health Physicist.

1.3 If necessary, it will be the . responsibility of the Shift Supervisor in concurrence witt the Shift Technical Advisor to notify the Radiation Protection Group to implement this procedure.

2.0 PURPOSE To provide a simplified method for estimating wholebody and child thyroid dose rates due to abnormal releases of radioactive materials to the environmenc. To provide a method to compare the integrated wholebody and child thyroid doses to the EPA Protective Action Guides (PAG's).

3.0 ATTACHMENTS AND RECORDS

1. Attachment 1 - Determination of Release Rates

2. Attachment 2 - Estimated Release Rates Due to Steam Generator Tube Rupture.

3. Attachment 3 - Approximation of Offsite Dose

4. Attachment 4 - Determination of Atmospheric Stability Class

5. Attachment 5 - Offsite Dose Data Sheet

6. Attachment 6 - Protective Action Guides

7. Figure 1 - Stack Monitor Response-(0 to 24 Hours)

8. Figure 2 - Stack Monitor Response (0 to 30 Days)

9. Figure 3 - Steam Dumps Monitor Response (0 to 24 Hours)

10. Figure 4 - Steam Dumps Monitor Response (0 to 30 Days)

11. Figure 5 - Stack Montior Total Noble Gas pa0581-0001a-89-93 L -

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-- l i 1 Emergency-Implementation Procedure EI-6, Rev-7 3 Estimatt of Offsite Dose

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5.4.3 Mark l(in spaces provided) calculated wholebody and thyroid dose rates at site boundary (SB) and each mile on isopleths.

l, 5.4.4 Determine and mark plume arrival time in space provided on isopleth.

Arrival time = (Distance (miles)/WS) + (Time Release Started)

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5.5 - Evaluate the hazard to the offsite population ~as follows:

5.5.1 Determine the two-hour wholebody and child thyroid doses for the 1 following locations:

Site Boundary 1 mile 2 miles

!- 5 miles

10 miles in direction of release. l 1

- 5.5.2 Record wholebody and child thyroid doses in Section C of f Attachment 5.

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5.5.3 Refer to Attachment 6 to determine recommended protective actions offsite. Recommendations showed be passed onto the SED to be i forwarded to affected offsite agencies. Information should. include dose projections, arrival time, and affected map sectors including one map sector either side'of the affected sectors.

5.6 Data needed for the offsite dose calculation should.be reviewed at least every.1/2-hour until the Site Emergency Director; requests longer intervals or determines they are no longer needed. The calculation should be updated if the stability class' changes, the affected map sectors change, the release rate increases, or the wind speed decreases.

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f EI-6 Rev 7 Page 1 ATTACIRENT 1 DETER:!INATION OF RELEASE RATES NOTE: If offsite radiological results are known, complete Step 3.0 of this attachment to calculate release ~ rates.

1. Use of Stack Gas Monitor Readings NOTE: **RIA-2318-2318 is the preferred monitor for determining release rate, use **RIA-2319 only if **RIA-2318 is not available.

1.1 Obtain stack gas flow rate (f t / min) from chart recorder **FRC 2318 for the latest two-hour period. Multiply by 0.028 to convert to m /3 min.

1.2 Obtain pre-release readings in cpm from the stack gas monitors

- RIA-2318 and **RIA-2319 as indicated on chart recorder RR-2300.

1.3 Obtain readings in epm for **RIA-2318 and **RIA-2319 during the release.

1.4 If both stack gas monitors **RIA-2318 and **RIA-2319 have gone offscale, go to Section 2.0 for this attachment.

I 1.5 Obtain a net reading by subtracting pre-release (Step 1.2 above) from the reading during the release (Step 1.3 above). Record appropriate information in Section B of Attachment 5.

1.6 Obtain noble gas release rate as follows:

for **RIA-2318 QN (Ci/sec) = (Net cpm)(pCi/cc)*(m3 / min flow)(1/60) cpm NOTE: Obtain Y '!## from Figure 5 for the applicable monitor. Use the six (6) hour tiEE*for release other than fuel melt for holdup times less than 15 days. Use the appropriate decay time on Figure 5 for holdup times greater than 15 days.

1.7 Estimate Iodine release rate from Step 1.6 (above) as follows:

QI (Ci/sec) = (QN)(1.0E-03) 1.8 Record release rates on Section B of Attachment 5.

1.9 Repeat readings approximately every 15 minutes until Health Physicist of Site Emergency Director requests longer intervals or determines they are no longer needed. ,

1.10 Go to Step 5.2 of the main procedure. -

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EI-6 Rev 7 Page 3 2.3.1 Background may be determined following release. Proceed with a conservative estimate including background until the release stops.

1. Use Figure 3 for steam dump releases for 0-24 hours after shutdown.

2. Use Figure 4 for steam dump releases for 0-30 days af ter shutdown.

2.3.2 Multiply dose rate for steam dump monitor by response factor (RF) of 2.67 to get net dose rate. Record information in Section B of Attachment 5. -

2.4 Iodine release rate may be estimated by multiplying noble gas release rate (2.2.4 or 2.3 above) by 1.0E-03.

2.5 Record release rate in Section B of Attachment 5.

2.6 Readings should be repeated approximately every 15 minutes until the Health Physicist or Site Emergency Director requests longer intervals or detennines they are no longer necessary.

2.7 Go to Step 5.2 of the main procedure. .

3.0 Offsite Radiological Monitcring NOTE: This method more accurately determined the iodine release rate which was estimated previously.

3.1 Determine iodine ground concentration CI (pCi/cm 3) using Emergency Implementation Procedure EI-9.

3.2 Calculate the iodine release rate QI (Ci/sec) using the following:

QI= CI X/Q Where: QI = Iodine release rate (Ci/sec)

CI = Iodine ground concentration (pCI/cm )

X/Q = Value from nearest point on isopleth where3 i dine 3

ground concentration was determined (sec/m )

3.3 Record as appropriate in Section B of Attachment 5.

3.4 Go to Step 5.2 of the main procedure.

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I- EI-6 Rev 7

. Page 1 ATTACmfENT 2 ESTIMATED RELEASE RATES DUE TO STEAM GENERATOR TUBE RUPTURE ACCIDENT 1.0 Determine Xe-133 Ci release from a steam generator by the following

-3 QN(CI/sec) = 5 GA VC 3.78 x 10

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5 = average energy of radioactivity in primary coolant.

GA = gaseous activity present in primary coolant, cY f = (If 5 and/or A are unknown use E

GA = 100).

VC = volume of primary coolant (gallons) that has leaked to the secondary system. If unknown use 8.19 x 104 gallons.

t = release period in seconds

Obtained from Chemistry report forms.

2.0 Determine I-131 Ci released from a steam generator by the following:

QI(Ci/sec) = D VC 3.78 x 10 ~3 t

D = dose equivalent I-131 obtained from Chemistry report forms (if unknown, use 40 pCi/cc).

VC = volume of primary coolant (gallons) that has leaked to the secondary system. If unknown, use 8.19 x'104 gallons.

} 3.0 Record appropriate information in Section B of Attachment 5.

4.0 Go to Step 5.2 of the main procedure.

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EI-6 Rev 7 Page 1 ATTACHMENT 3 APPROXIMATION OF 0FFSITE DOSE 1.0 Determine the following points on the area map in the Technical Support Center in the direction of the release path:

Site Eoundary -

5 miles 10 miles Nearest population point (city, town, etc) 2.0 Determine the X/Q values for the points in Step 1.0 from Table 3.1 (these values are calculated for stability condition E and a wind speed of 2 m/sec).

3.0 Determine wholebody dose (2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months exposure) for the points in Step 1.0.

D wb = (X/Q)(QN)(8.6x10 ) Rem Where: Dwb = wholebody dose (Rem)

X/Q = atmospheric dispersion' factor (sec/m3)

QN = Noble gas release rate (Ci/sec) (Attachment 1) 2 2 8.6x10 = 4.3x10 rem /hr x 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months Ci/m 3 4.0 Determine child thyroid dose (2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months exposure) for the points in Step 1.0 above.

6 D

c = (X/Q)(QI)(7.4x10 ) Rem Where: D ct

= child thyroid dose (Rem)

QI = release rate of radioiodinces Ci/:ec (Attachment 1) 0 7.4x10 = child thyroid dose conversion fcctor Rem-m3 Ci 5.0 Record appropriate information in Section C of Att::Ement 5.

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EI-6 Rev 7 ,

Page 1 TABLE 3.1 X/Q Versus Distance for Stability Condition E and Wind Speed 2 m/sec Distance Miles Meters X/Q (sec/m3 )

.435 700 (Site Boundary) 1.48 x 10 -4 1.00 1609 5.33 x 10

-5 2.00 3219 1.98 x 10 -5 3.00 4828 1.20 x 10

-5 4.00 6437 8.11 x 10 -6 5.00 2047 6.25 x 10 ~0 6.00 9656 4.90 x 10 -6 7.00 11265 4.35 x 10 -6 8.00 12875 3.53 x 10 -6 9.00 14484 3.26 x 10 ~0 10.00 16093 2.79 x 10 ~0 pa0581-0001e-89-93

EI-6 Rev 7 Page 1 ATTAClIMENT 4 DETERMINATION OF ATMOSPHERIC STABILITY CLASS 1.0 Using Control Meterological Terminal 1.1 This is the preferred method, if meteorology tower data is unavailabic, go to Part 2.0. '

1.2 Following the posted instructions in the Control Room, activate the meteorological terminal and obtain a printout. The printout should be in the form of the following example.

7 SITE PALI PALI PALI PALI PALI PALI PALI PALI IIEIGIIT 10-M 6010 10-M 10-M 10-M 60-M 60-M 60-M PARAMETER TEMP DELT WS WD SGMA WS WD SGMA UNITS C C MPil DEG DEG MPH DEG DEG AVE ENDING-EST 02/12/80 15:00 -4.7 -0.49 11.70 249. 14.3 14.11 241. 10,2 STATUS 00 0 0 0 0 0 0 0 0 1.3 Verify the " STATUS 00" to be "0" for the "10-M WS" and "10-M WD" columns (10 meter wind speed and wiad direction, respectively) and record readings in Section A of Attachment 5.

NOTE: If status is other than 0, record "60-M WS" and "60-M WD".

1.4 Verify the " STATUS 00" to be "0" for the "6010 DELT" column (60 meter /10 meter temperature differential) and note reading on Attachment 5.

NOTE: If status is other than 0, go to Step 1.6.

1.5 Use Table 4.1 of this attachment in conjunction with Parameter DELT to determine stability class. Record in Section A of Attacbsent 5.

Return to Step 5.3 of the main procedure pa0581-0001f-89-93

EI-6 Rev 7 Page 3 2.2 Dial any of the following numbers using the adjacent telephone and place the handset in the telephone coupler at the back of the terminal.

Ann Arbor (313) 996-0351 Detroit (313) 964-5538 Chicago (312) 938-0500 2.2.1 When the green light at the front of the keyboard lights, type two Carriage Returns. Note.those items to be entered are in quotes. Do not type quotes.

NOTE: If WSI in unavailable, go to Step 1.0.

2.2.2 When the terminal responds with " TERMINAL =" type "T145" then Carriage Return (cr.).

2.2.3 When the terminal responds with "@" type: "C (space 617133" and two more Carriage Returns.

2.2.4 When requested, type "LOGIN PAL" then (cr).

2.2.5 The password, when requested, is " POWER" then (cr).

2.3 Type " NUKE PALI" (cr) 2.3.1 Use the table labeled "Recent Hourly Obs and Pasquill Stability" for .

Benton Harbor. Wind direction is read from the column labeled " wind",

l wind direction is given in tens of degrees from true north and wind 4 speed is in knots. The first two digits are wind direction and the last two digits are wind speed. For example: 2213 would represent a :

wind direction of 220 degrees and a wind speed of 13 knots. ,

2.3.2 Convert wind speed to miles per hour as follows:

h Speed Speed x /./f (mph / knot) = mph 2.4 Type "LOGOUT" (cr) when the session is over and replace telephone.

Reconnect the meteorological tower line.

2.5 Return to Step 5.3 of main procedure.

3.0 Using FAA Information Use this section if there is no information from the meteorology tower er if the status of all of the column 2 d 2 scribed is not "0".

3.1 Contact the FAA in Benton Harbor and obtain wind speed and wind direction (925-5264).

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EI-6 Rev 7 ATTACHMENT 5 Page 1 0FFSITE DOSE DATA SHEET Date A. Meteorology: Time WS mph WD DEG Stability Class 6010 Delt B. Release Rate:

- RIA-2318 /**RIA-2319 Monitors I Stack Gas Flow Rate Monitor Reading (cpm) (Cu Ft/ min) QN QI Calculated Time Gross Bkg Net to Cu Meters / min (Ci/sec) (Ci/sec) By:

, High Range Effluent Monitor Dose rate to Monitor Reading ( R/hr) release rate '

QN QI Calculated Time Gross Bkg Net RF x Net ratio R/hr (Ci/sec) (Ci/sec) By:

Ci/sec

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Offsite Measurements Instrumentation Used QI Calculated Time Model# Serial # Date Location (Ci/sec) Other By:

C. Offsite Doses WHOLEBODY DOSES (REM) CHILD THYROID DOSES (REM)

(2.89E3)(X/Q)(QN)(2.23/WS) (3.69E6)(X/Q)(QI)(2.23/WS) Calculated .

Time SB 1 mi 2 mi 5 mi 10 mi Other SB 'l mi 2 mi 5 mi 10 mi Other By:

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ATTACIIMENT 6 RECOMf! ENDED PROTEC'IVE ACTIONS TO REDUCE Wil0LEBODY AND TIIYROID DOSE FR0ff EXPOSURE TO A GASEOUS PLUME Projected Dose (Rem) to g the Population Recommended Actions Comments ,

( Previously recommended protect.ive Wholebody <1 No planned protective act. ions State may issue an advisory to seek shelter and await actions may be reconsidered or i further instructions, terminated. }

Thyroid <5 Monitor environmental radiation levels. '.

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Whoichody I to < 5 Seek shelter as a minimum. If constraints exist, special Consider evacuation. Evacuate unless constraints make consideration shculd be given for Thyroid ., to < 25 it impractical. evacuation of c'.ildren aral t!onitor environmental radiation levels. pregnant women.

Control access.

Whoicbody 5 and above Conduct mandatory evacuation. Seeking shulter would be an ,

t!onitor environmental radiation levels and adjust area alternati ve if evacuation were Thyroid 25 and above for mandatory evacuation based on these levels. not immediately possible.

Control access.

t l Projected Dose (Rem) to -

Emerg;ency Team Workers ;

Wholebody 25 Control exposure of emergency team members to these although respirators and stable levels except for lifesaving missions. (Appropriate iodine should be used where Thyroid 125 controls for emergency workers, include t.ime effective to control dose to ;

limitations, respirators and stable iodine.) emergency team workers, thyroid ,

i dose may not. be a limiting factor for lifesaving missions.

Wholeb9 dy 75 Cont rol exposure of emergency team members perfor ming lifesaving missions to this level. (Control of time of exposure will be most ef fective).

(a)These actions are recommended for planning purposes. Protective action decisions at the time or the incident. must take existing conditions into consideration. l (b)At the time of the incident, officials may implement low-impact prote<;ive actions in keeping with the principle of ,

maintaining radiation exposures as low as reasonably achievable. ,

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ML20041A205

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