Text

Public Version of Rev 10 to Emergency Plan Implementing Procedure EI-6, Estimate of Offsite Dose
	ML20073H976
Person / Time
Site:	Palisades
Issue date:	03/28/1983
From:	Krich R, Montross R; CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	;
Shared Package
ML18051A370	List: ML18051A369; ML20073H964; ML20073H976;
References
	EI-6-01, EI-6-1, NUDOCS 8304190125
	Download: ML20073H976 (18)
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Proc No EI-6 Revision 10 Date 3 / 2P/ 83 PALISADES NUCLEAR PLANT EMERGENCY IMPLEMENTATION PROCEDURE Revision and Approval Summary TITLE: ESTIMATE OF 0FFSITE DOSE 1.

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s PALISADES NUCLEAR PLANT Proc No EI-6 EMERGENCY IMPLEMENTATION PROCEDURE Revision 10 Page i TITLE: ESTIMATE OF OFFSITE DOSE Table of Contents Page 1.0 PURPOSE 1

2.0 INITIAL CONDITIONS AND/OR REQUIREMENTS.

I 3.0 PROCEDURE 1

4.0 ATTACHMENTS AND RECORDS 3

ATTACIDIENTS, " Determination of Release Rates", " Estimated Release Rates Due to Steam Generator Tube Rupture", " Approximation of Offsite Dose", " Determination of Atmospheric Stability Class", "Offsite Dose Data Sheet", " Protective Action Guides",

Figure 1, " Stack Monitor Response (0 to 24 Hours)",

Figure 2, " Stack Monitor Response (0 to 30 Days)"

-Attachment 9, Figure 3, " Steam Dumps Monitor Response (0 to 24; Hours)" 0, Figure 4, " Steam Dumps Monitor Response (0 to 30 Days)" 1, Figure 5, " Stack Monitor Total Noble Gas l

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PALISADES NUCLEAR PLANT Proc No EI-6 EMERGENCY IMPLEMENTATION PR0f3 DURE Revision 10 Page 1 of 3 TITLE: ESTIMATE OF OFFSITE DOSE 1.0 PURPOSE To provide a simplified method for estimating wholebody and child thyroid dose rates due to abnormal releases of radioactive materials to the environment. To provide a method to compare the integrated wholebody and child thyroid doses to the EPA Protective Action Guides.

l (PAG's).

1.0 mDT, C0"DITim UWO9 '? MET 75 l

2.1 This procedure is to be used for rapid estimate of offsite doses.

Actual environmental monitoring should be done as soon as possible t'o verify the dose estimate (see Section 3.0 of Attachment 1 of this procedure).

2.2 The duration of the release is assumed to be a two-hour period for this procedure.

2.3 Personnel Responsible:

j a.

The Chemistry / Health Physics Superintendent or the Plant Health Physicist is responsible for the implementation of this procedure.

~ b.

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.

If necessary,- it will be the responsibility of the Shift Super-c.

visor in concurrence with the Shift Technical Advisor to notify-the Radiation Protection Group to implement this procedure.

3.0 PROCEDURE 3.1 Determine release rate (Ci/sec) using Attachment 1.

NOTE:

If a steam generator tube rupture accident occurs, check the high range steam dump monitor in the NE corner of the Technical Support Center near the drinking fountain for a release.

If the high range steam dump monitor indicates a release, determine the release rate using Attachment 1, Section 2.3.

If the high range steam dump monitor indicates no release, use Attachment 2 to estimate the release rate.

3.2 If desired, a conservative approximation of wholebody and child thyroid dose may now be determined using Attachment 3.

3.3 Determine atmospheric stability class using Attachment 4.

3.3.1 After determining stability class, select appropriate dose contour overlay (isopleth) and place it over appropriate area map.

NOTE:

Upper left hand corner of isopleth and map had a date of April 1,1981 and a set number starting with PAL 81 followed by a letter designating eiO581-0001a154-89

- - ~

PALISADES NUCLEAR PLANT Proc No EI-6 I

- EMERGENCY IMPLEMENTATION PROCEDURE Revision 10 Page 3 of 3 TITLE: ESTIMATE OF OFFSITE DOSE 3.6 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.

4.0 ATTACHMENTS AND RECORDS 4.1, " Determination of' Release Rates" 4.2 Attachment.2, " Estimated Release Rates Due to Steam Generator Tube Rupture" 4.3, " Approximation of Offsite Dose" 4.4

~ Attachment 4, " Determination of Atmospheric Stability ClasE" 4.5, "Offsite Dose Data Sheet" 4.6, " Protective Action Guides" 4.7,

Figure 1, " Stack Monitor Response (0 to 24 Hours)"

4.8,

Figure 2, " Stack Monitor Response (0 to 30 Days)"

4.9,

Figure 3, " Steam Dumps Monitor Response (0 to 24 l

Hours)"

4.10 0, Figure 4, " Steam Dumps Monitor Response (0 to 30 Days)"

4.11 1, Figure 5, " Stack Monitor Total' Noble Gas" i

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Proc No EI-6 Revision 10 Page_1 of 3 DETERMINATION OF RELEASE RATES i

NOTE: If offsite radiological results are known, complete Step 3.0 of this attachment to calculate release rates.

j 1.0 Use of Stack Gas Monitor Readings NOTE:

- RIA-2318 is the preferred monitor for determining release rate, use

- RIA-2319 only if **RIA-2318 is not available.

3 1.1 Obtain stack gas flow rate (f t / min) from chart recorder **FRC 2318 for 3

the latest two-hour period. Multiply by 0.028 to convert to m / 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.

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 3

QN (Ci/sec) = (Net epm)(pci/ce)*(m / min flow)(1/60) cpm YI#

NOTE: Obtain from Figure 5 for the applicable monitor. Use the six (6) hour *EIme 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 or Site Emergency Director requests longer intervals or determines they are no longer needed.

1.10 Go to Step 5.2 of the main procedure.

eiO581-000lbl54-89 1

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g Proc No EI-6 Revision 10 Page 3 of 3 DETERMINATION OF RELEASE RATES 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 af ter shutdown.

2.

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

2.3.2 t!ultiply dose rates for steam dump monitor by a. Response Factor (RF) of 4.3 to get 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 determines they are no longer necessary.

2.7 Go to Step 5.2 of the main procedure.

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

3 3.1 Determine iodine ground concentration CI (pCi/cm ) 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) 3 CI = Iodine ground concentration (pCI/cm )

X/Q = Value from nearest point on isopleth where i dint 3

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.

eiO581-000lbl54-89

Proc No EI-6 Revision 10 Page 1 of 1 ESTIMATED REI. EASE RATES DUE TO STEAM GENERATOR

~

TUBE RUPTURE ACCIDENT I

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 t

5 = average energy of radioactivity in primary' coolant.

GA = gaseous activity present in primary coolant, Y f = (If 5 and/or-A are unknown use E GA = 100).

t 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:

~

-3 QI(Ci/sec) = D VC 3.78 x 10 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 4

secondary system. If unknown, use 8.19 x 10 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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l Proc No EI-6 Revision 10 Page 1 of 2 APPROXIMATION OF OFFSITE DOSE 1.0 Determine the following points on the_ area map in the Technical Support Center in the direction of the release path:

Site Boundary 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.

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

X/Q = atmospheric dispersion factor (sec/m ).

3 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/m3 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.

0

~

D

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

= child thyroid dose (Rem)

QI = release rate of radioiodines Ci/sec (Attachment 1) 0 7.4x10 = child thyroid dose conversion factor Rem-m3 Ci 5.0 Record appropriate information in Section C of Attachment 5.

eiO581-0001d154-89 '

Proc No EI-6 Revision 10 Page 1 of 4 DETERMINATION OF ATMOSPHERIC STABILITY CLASS 1.0 Using Control Meterological Terminal 1.1 This is the preferred method, if meteorology tower data is unavailable, go to Part 2.0.

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

?

SITE PALI PALI PALI PALI PALI PALI PALI PALI HEIGHT 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 FPH 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 1.3 Verify the " STATUS 00" to be "0" for the "10-M WS" and "10-M WD" columns (10 meter wind speed and wind 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 l

meter /10 meter temperature differential) and note reading on.

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 Attachment 5.

t Return to Step 5.3 of the main procedure l

l eiO581-0001e154-89 l

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Proc No EI-6 Revision 10 Page 3 of 4 DETERMINATION OF ATMOSPHERIC STABILITY CL\\SS NOTE:

OFF is to the RIGHT ON is to the LEFT 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 Detroit Chicago 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 3.0.

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 fror true north and wind speed is in knots. The first two digits are viad 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.

l 2.3.2 Convert wind speed to miles per hour as follows:

I Speed Speed x 1.15 (mph / knot) =

mph 2.4 Type "LOGOUT" (cr) when the session is over and replace telephone.

l Reconnect the meteorological tower line.

l 2.5 Return to Step 5.3 of main procedure, eiO581-0001e154-89

Proc No EI-6 Revision 10 Page 1 of.1 0FFSITE DOSE DATA SHEET Date A. Meteorology: Time WS mph WD DEG Stability' Class 6010 Delt 4

B. Release Rate:

- RIA-2318 /**RIA-2319 Monitors 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

,r 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 Offsite Measurements Instrumentation Used QI Calculated Time Model#

Serial # Date Location (Ci/sec)

Other By:

I C. Offsite Doses WHOLEBODY DOSES (REM)

CHILD THYROID DOSES (REM)

(2.89E3)(X/0)(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 1 mi 2 mi 5 mi 10 mi Other By:

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Proc No EI-6 Revision 10 Page 1 of 1 RECOMMENDED PROTECTIVE ACTIONS TO REDUCE WlIOLEBODY AND TIIYROID DOSE FROM EXPOSURE TO A CASEOUS PLUME Projected Dose (Rem) to the Population Recommended Actions (*

Conunents Wholebody

<1 No planned protective actions Previously reconunended protective State may issue an advisory to seek shelter and await actions may be reconsidered or further instructions.

terminated.

Thyroid

<5 Monitor environmental radiation levels.

Wholebody 1 to < 5 Seek shelter as a minimum.

If constraints exist, special Consider evacuation. Evacuate unless constraints make consuleration should be given for Thyroid 5 to < 25 it impractical, evacii.stion of children and Monitor environmental radiation levels.

pregiunt women.

Control access.

Wholehody 5 and above conduct mandatory evacuation.

Seekini; shelter would be an Monitor environmental radiation levels and adjust area alteinative if evacuation were Thyroid 25 and above for mandatory evacuation based on these levels.

not i.nraediately possible.

Control access.

Projected Dose (Rem) to Emergency Team Workers Wholebody 25 Control exposure of emergency team merbers to these Although respirators and stable levels except for lifesaving missions.

(Appropriate iodina should be used where Thyroid 125 controls for emergency workers, include time effective to control dose to.

limitations, respirators and stable iodine.)

emergency team workers, thyroid i

dose 4aay not be a limiting factor for lifesaving missions.

i Wholebody 75 Control exposure of emergency team members performing lifesaving missions to this level.

(Control of time of exposure will be most effective).

(a)These actions are recommended for planning purposes. Protective action decisions at the time of the incident must take existing conditions into consideration.

'(

At the time of the incident, officials may implement low-impact protective actions'in keeping with.the principle of l

maintaining radiation exposures as low as reasonably achievable.

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