ML022600592

0 to EPIP EPI-B7b, Model Offsite Dose Calculations

ML022600592
Person / Time
Site:	Perry
Issue date:	09/09/2002
From:	Higaki V FirstEnergy Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Security and Incident Response
References
EPI-B7b Rev. 10
Download: ML022600592 (36)

Text

FENOC PerryNuclear Power Plant 10 Center Road RO Box 97 FirstEnergy Nuclear OperatingCompany Perry,Ohio 44081 September 9, 2002 PY-CEI/NRR- 2663L United States Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 Perry Nuclear Power Plant Docket Nos. 50-440 Submittal of Emergency Plan Implementing Instructions Gentlemen:

Pursuant to 10 CFR 50 Appendix E, enclosed are changes to the Emergency Plan Implementing Instructions (EPIs) for the Perry Nuclear Power Plant. These changes constitute revisions, temporary changes, or reissued pages. Please follow the updating instructions per the attached Controlled Document Instruction Sheet and return the signed Acknowledgment of Receipt form.

If you have questions or require additional information, please contact me at (440) 280-5294.

Very truly yours, Vernon K. Higaki, Supervisor Emergency Planning Unit VKH:byr Enclosure cc. NRR Project Manager NRC Resident Inspector NRC Region Ill, Incident Response Center w/attachments 0'Y\

FIRSTENERGY CORPORATION PERRY NUCLEAR POWER PLANT UNIT I & 2 ACKNOWLEDGMENT OF RECEIPT Title Emercqency Plan Implementingq Instructions (EPI) EPI-B7b/ Rev.10 Control No. 60 Letter No./Date PY-CEIINRR-2663L / September 9. 2002 Signature Date Title Return to:

Perry Nuclear Power Plant Attn: B.Y. Richardson, A240 P. O. Box 97 Perry, Ohio 44081

FIRSTENERGY CORPORATION Perry Nuclear Power Plant Controlled Document Instruction Sheet Manual: Emerqency Plan Implementing Instructions EPI-B7b/ Rev.10 Control Number 60 Revision Number Insert Remove and Replace 10 Revision 10 Reissue Entire Document

EPI-B7b Page: i Rev.: 10 PERRY OPERATIONS MANUAL FWPP Emergency Plan Implementing Instruction No.'I*

lNF0RrIpq- Y TITLE: MANUAL OFFSITE DOSE CALCULATIONS REVISION: - 10 EFFECTIVE DATE:

PREPARED: Louis J. Sosler 6-5-02

/ Date

i EPI-B7b Page: ii Rev.: 10 MANUAL OFFSITE DOSE CALCULATIONS

• Table'of Contents Section Title Page

.48rifr SE 1

2.0 SSCOPE 1

3.0 RESPONSIBILITIES i

,3.

' 2 Emergency' Coordinator Offsite Radiation Advisor 3.3 TSC/EOF Dose Assessor(s) 2

4.0 REFERENCES

2 5.0 DEFINITIONS 6.0 DETAILS 4 ATTACHMENTS Attachment 1 - Meteorology and Atmospheric Dispersion 6 Attachment 2 - Dose Calculations Based on Elevated Effluent Monitor Readings 13 Attachment 3 - Dose Calculations Based on Field Measurements 19 Attachment 4 - Calculation of-Accumulated Dose 29 N

SCOPE OF REVISION:

Rev. 10 - 1. Page 14; 3".1.9, second paragraph, change last page number to reference 15, vice, 16.

2. Page 17, Attachment 2, "COMMITTED DOSE EQUIVALENT - CHILD THYROID", change "X" to "=".

3. Page 19, 3.1.4, change block "E" to block "F".

4. Page 21, 3.2.3.3, change Figure "3-3" to "3-2".'

i' ,.

EPI-B7b Page: 1 Rev.: 10 MANUAL OFFSITE DOSE CALCULATIONS 1.0 PURPOSE This instruction provides backup offsite emergency dose assessment methods and techniques that could be used to estimate the potential offsite consequences of a significant radioactivity release to the environment. This instruction also provides methods for obtaining forecast meteorology and meteorological parameters from the site MET Tower, National Weather Service, or direct observation.

2.0 SCOPE This Instruction should be used to conduct manual off-site dose calcualtions when the Computer Aided. Dose Assessment (CADAP) program is unavailable for use or is not working properly.

3.0 RESPONSIBILITIES 3.1 Emergency Coordinator NOTE: These duties shall be performed by the Operations Manager prior to Emergency Operations Facility (EOF) being operational, or the Shift Supervisor prior to Technical Support Center (TSC) being operational.

1. Review and approve protective actions recommended by Offsite Radiation Advisor.

2. Relay the results of dose projections and appropriat6 protective action recommendations to the applicable offsite agencies.

3.2 Offsite Radiation Advisor NOTE: These duties shall be performed by the Radiation'Protection Coordinator prior to EOF being operational, or the Shift Technical Advisor, if stationed, prior to TSC being operational.

1. Review appropriate dose calculations performed by the Dose Assessor(s).

2. Review protective action recommendations based on the calculations performed by the Dose Assessor(s), and-recommend approval to the Emergency Coordinator.

EPI-B7b Page: 2 I, Rev.: 10 3.3 TSC/EOF Dose Assessor(s)

NOTE: These duties shall be performed by ,the On-Shift Chemistry Technician prior to TSC or EOF being declared operational.

1. 'Perform offsite dose calculations, based on the applicable section(s) of this instruction.

2. Develop protective action recommendations in accordance, with <EPI-B8>.

4.0 REFERENCES

4.1 Source

References:

1. Emergency Plan for PNPP Docket Nos. 50-440, 50-441

2. EPI-B9: Emergency Records

3. EPI-Al: -Emergency Action Levels

4. EPI-B3: Radiological Surveys for Emergencies ,

4.2 Use

References:

1. EPI-B7a: Automated OffsitejDose Calculations

2. EPI-B8: Protective Actions}and Guides

3. Implementation of EPA-400-92-001, Manual of Protective Action Guides and Protective Actions for Nuclear Incidents

4. NUS (R. R. Bowers) calculatiohs dated 11/1/93. -[CEI Purchase Order No. C-901596)

5. Validation & Verification Report for the Perry Plant CADAP, dated 11/15/93. [Pacific Nuclear;Systems, Inc./mbs Consulting Partners]

6. Meteorology and Atomic Energy [1968, USAEC Division of Technical Information]

7. FEMA-REP-2, Guidance on Offsite Emergency Radiation Measurement Systems, dated 9/80.

8. Technical Basis Package forýAlternate Offsite Dose Hand Calculations

[NUS Corporation File No. 2065-49]

9. Commitments addressed in this document:

B00800 L00438 S00552 1 L00063 L00474

EPI-B7b

• Page: 3 Rev.: 10 5.0 DEFINITIONS 5.1 Atmospheric Dispersion Parameter Symbol X/Q ("chi over q"). The amount of dispersion that' has occurred between the point of release and the downwind plume centerline point of interest. X/Qs are expressed in units of sec/m 3 .

5.2 Dose Calculations The evaluation of the consequences of a release of radioactive material which has exposed, or which may expose, emergency response personnel and members of the general public. Dose calculations include projection of offsite doses based on release parameters forboth noble gases and iodines that could contribute to Total Effective Dose Equivalent (TEDE) and Committed Dose Equivalent-Child Thyroid (CDEct) doses.

5.3 Dose Factors Factors incorporated in calculations to convert the radioactivity concentration at the plume centerline, downwind point of interest to a TEDE for noble gases and a child thyroid dose commitment per hour of inhalation for iodines. The dose factors listed for the various calculation methods often include constants and unit conversion factors "in order to reduce the time needed to perform a calculation. The dose factors are based on USNRC Regulatory Guide 1.109 (Rev. 1) and EPA-400-R-92-001.

5.4 Ground Level Release The release of airborne radioactivity from building vents, buildings, or structures (other than an elevatedostack or vent). In keeping with NRC guidance, all releases from Perry are considered to be ground level releases. In a ground level release, the radioactivity concentration is highest at the point of release and decreases with distance to downwind locations.

5.5 Pasquill Stability Class A term used to describe the atmospheric conditions relevant to the dispersion of a release. The conditions are categorized into seven classes A through G. Class A is considered to be "very unstable"and correlates to the best dispersion. Class G is very stable, resulting in poor dispersion (and thereby higher offsite concentrations).

5.6 Committed Dose Equivalent (CDE)

.The dose equivalent to organs or tissues of reference that will be received -from an intake of radioactive material by an individual during the 50 year period following the intake.

EPI-B7b Page: 4 Rev.: 10 5.7 Committed Effective Dose Equivalent (CEDE)

The sum of the products of the weighting factors applicable to each of the body organs or tissues and the committed dose equivalent to these organs or tissues. CEDE is the internal dose component of TEDE.

5.8 Deep Dose Equivalent (DDE)

The dose equivalent measured at a tissue depth of 1 cmi (1000 mg/cm2 ).

DDE is the external dose component of TEDE.

5.9 Total Effective Dose Equivalent (TEDE)

The sum of DDE (external dose) and CEDE (internal dose).

6.0 DETAILS The'following action will be perfoimed by the TSC/EOF Dose Assessor(s) or Shift Chemistry Technician:

6.1 Use Attachment 1, Meteorological' and Atmospheric Dispersion (X/Q), to obtain meteorological data from the following sources:

Perry Meteorological Tower National Weather Service (NWS)

Direct Observation 6.2 Calculate Total Effective Dose Equivalent (TEDE) and Committed Dose K

Equivalent to the Child Thyroid :(CDEct) using the most applicable calculational method:

"* Dose Calculations Based on Elevated Effluent Monitor Readings (Attachment 2)

"* Dose Calculations Based on Field Measurements (Attachment 3) 6.3 Perform calculations per <EPI-B8> to develop an offsite protective action recommendation (PAR) if projected doses exceed 1 rem Total Effective Dose Equivalent (TEDE)'or 5 rem Committed Dose Equivalent-Child Thyroid (CDEct) at the Site Boundary.

6.4 Record accumulated dose utilizing Attachment 4, using a separate Accumulated Dose Calculation Sheet' for each downwind'sector.

6.5 Contact the National Weather Service (NWS) using Part II of the Emergency Response Telephone Directory to obtain-the forecast meteorological data.

,NOTE: The NWS should be contacted periodically while performing dose' assessments to verify potential changes in meteorological conditions.

,52

EPI-B7b Page: 5 Rev.: 10 6.6 Repeat the dose projection calculations whenever conditions or parameters (monitor readings,fMET data, etc.) change during the first few hours following a release and at least once per hour for as long as the release continues.

6.7 Records The following records are generated by this document:

Quality Assurance Records Meteorological Data Calculation Sheet: PNPP No. 8036 Effluent Monitor Reading Calculation Sheet: PNPP No. 9429 RMT Field Measurement Calculation Sheet: -PNPP No. 8049 RMT Air Sample Calculation Sheet: PNPP No. 8050 RMT Sample Analysis Calculation Sheet: PNPP No. 8052 Accumulated Dose Calculation Sheet: PNPP No. 8054 Non-Quality Records None

-I I

EPI-B7b Rev.: 10 Attachment 1: Sheet-i of 7 Page: 6 METEOROLOGY AND ATMOSPHERIC DISPERSION 1.0 PURPOSE This attachment is used to determine current meteorological conditions and X/Q values necessary to calculate offsite dose rates.

'1 2.0 PREREQUISITES None 3.0 ACTIONS The following are methods, listed in order of preference, for obtaining meteorological data and X/Q values:

Perry Meteorological Tower (Section 3.1)

National Weather Service (Section 3.2)

Direct Observation (Section53.3) 3.1 Perry Meteoroloaical Tower i d MET data can be'obtained from the Plant Integrated Computer System (ICS).

or locally at-the MET Tower. The Integrated Computer System will display the stability class directly on the Meteorological Data screeen.

3.1.1 Record the wind speed, wind'direction, differential temperature, and stability class on the Meteorological Data Calqulation Sheet (PNPP No. 8036). In addition,, record differntial temperature ,(AT) and standard deviation (aO), only if stability class is not directly available.

NOTE: Wind direction and'wind speed are listed below in preferred order:

WIND'DIRECTION WIND'SPEED

- lom - 10

- 60m - 60m, multiplied by one of the following:

(1) 0.76 if stability class is A, B, C, or D; (2) 0.48 if stability class is E, F, or G; (3) 0.63 if stability class is unknown

EPI-B7b Rev.: 10 Attachment 1 Sheet 2 of-7 - Page: 7 METEOROLOGY-AND-ATMOSPHERIC DISPERSION (Cont.)

3.1.2 If not available from the MET Tower printout, determine the stability class from the delta T or standard deviation (oO) tin that order]

using the number lines below and record on the Meteorological Data Calculation Sheet.

Temperature Change (AT) with Height (*F/50m)

A B C D E F G

< -I I-I------> AT

-1.71 -1.54 -1.35 -0.45 1.34 3.59 Standard Deviation (ae), in degrees A B Cý D E F G

<-I I I 1-1->e 22.5 17.5 12.5 7.5 3.8 2.1 Source: Meteorology and Atomic Energy [1968, USAEC Division of.

Technical Information]

NOTE: If value equals number on the division line, use the stability class to the right of the line.

3.1.3 Determine the Xp/Q values for the site boundary, 2 miles, 5 miles, 10 miles, or distance of concern, ,by using the Data Table 1-1 to select'the column which corresponds to the stability class; record these Xp/Q values'onto the Meteorological Data Calculation Sheet.

Data Table 1-1 DISTANCE STABILITY CLASS (miles) A B C D E F G Site

• Boundary 1.10E-5 5.66E-5 1.45E-4 3.63E 6.61E-4 1.09E-3 1.66E-3 1 1.86E-6 1.70E-5 4.94E-5 1.36E-4 3.02E-4 5.67E-4 1.06E-3 2 4.49E-7 4.35E-6 1.46E-5 4.25E-5 1.18E-4 2.38E-4 5.21E-4 3 3.17E-7 1.95E-6, 7.11E-6 2.12E-5 6.79E-5 1.40E-4 3.23E-4 4 2.49E-7 1.10E-6 4.28E-6 1.30E-5 4.61E-5 9.61E-5 2.27E-4 5 2.06E-7 7.06E-7 2.89E-6 ' 8.83E-6 3.43E-5 7.20E-5 1.73E-4 6 1.77E-7 4.90E-7 2.09E-6 6.46E-6 2.70E-5 5.70E-5 1.38E-4 7 1.56E-7 3.60E-7 1.60E-6 4.95E-5 2.21E-5 -4.68E-5 1.14E-4 8 1.39E-7 2.76E-7 1:26E-6 3.94E-6 1.86E-5 3.96E-5 9.67E-5 9 - 1.26E-7 2.18E-7 1.03E-6 3.21E-6 1.61E-5 3.42E-5 8.38E-5 10' 1.16E-ý7 1.76E-7 8.54E-7 2.68E-6 1.41E-5 3.O0E-5 7.38E-5 Source: NUS (R.R. Bowers) calculations, dated 11/1/93.

[CEI Purchase Order No. C-901596]

3.1.4 Divide each Xg/Q value by the wind speed to determine X/Q and record on the Meteorological Data Calculation Sheet.

EPI-B7b Rev.: 20 Attachment 1' Sheet'3 of 7 Page: 8

METEOROLOGY AND ATMOSPHERIC DISPERSION (Cont.)

3.1.5 Enter the data source, date* time and signature of performer on the Meteorological Data Calculation Sheet.

3.2 National Weather Service (NWS) 3.2.1 Contact the NWS using the PNPP Emergency Response Telephone Directory and request the following MET data: <S00552> /

a. General weather forecast for the next 12 to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

b Wind speed and direction (indicate To/From).

c. Pb6ssibility of a frontal system passing through the area in the next several hours which could cause a change in wind direction.

d. Sky cover estimate, or a "gross'" stability estimate

e. Possibility of precipitation which could affect deposition from the plume.

f. Possibility of adverse weather conditions developing which could affect evacuation times. (If weather conditions are currently poor, the possibility 6f a favorable change which could improve evacuation conditions.)Y Record wind speed and direction on the Meteorological Data CalculationSheet.

3.2.2 Using the Data Table 1-2 (on the following page), identify the Stability Class (A-G) associated with the observed Wind speed and sky conditions, and record on the Meteorological Data' CalCulation Sheet.

CAUTION When uncertain about the choice of Stability Class based on local observations, choose the most restrictive Stability Class that cannot be reasonably excluded. G is the most restrictive Stability Class, and A is the least restrictive'Stability Class.

4,

'I

EPI-B7b Rev.: 10 .' Attachment, I Sheet 4 of ,7I%<' Page: 9 METEOROLOGY AND ATMOSPHERIC DISPERSION (Cont.)

Data Table 1-2 Night Time Wind Speed Daytime Sun Strength Thin overcast > 50%

mph Strong Moderate Slight or < 50% low low cloud cloud cover- cover

< 4.5 A B B F G 4.5 - 6.6 B B C E F 6.7 -11.1 B C C D E

.11.2-13.4 C D D D D

>13.5 .C D D D D Source: Meteorology and Atomic Energy [1968, USAEC Division of Technical Information]

3.2.3 Determine the X./Q values for the site boundary, 2 miles, 5 miles, and 10 miles, or distance of concern, by using Data Table 1-1 below to select the column which corresponds to the stability class; record these Xji/Q values onto the Meteorological Data Calculation Sheet.

_ _Data Table 1-1 DISTANCE STABILITY CLASS (miles) A B C D E F G Site Boundary 1.10E-5 5.66E-5 1.45E-4 3.63E-4 6.61E-4 1.09E-3 1.66E-3 1 1.86E-6 1.70E-5 4.94E-5 1.36E-4 3.02E-4 5.67E-4 i.06E-3 2 4.49E-7 4.35E-6 '1.46E-5 4.25E-5 1.18E-4 2.38E-4 5.21E-4 3 3.17E-7 1'. 95E-6 7.l1E-6 2.12E-5 6.79E-5 1.40E-4 3.23E-4 4 2.49E-7 1.10E-6 4.28E-6 1.30E-5 4.61E-5 9.61E-5 2.27E-4 5 2.06E-7 7.06E-7 2.89E-6 8.83E-6 '3.43E-5 7.20E-5 1.73E-4 6 1.77E-7 4.90E-7 2.09E-6 6.46E-6 2.70E-5 5.70E-5 1.38E-4 7 1.56E-7 3.60E-7 1.60E-6 4.95E-5 2.21E-5 4.68E-5 1.14E-4 8 1.39E-7 2.76E-7 -1.26E-6 3.94E-6 1.86E-5 3.96E-5 9.67E-5 9 1.26E-7 2.18E-7 1.03E-6 3.21E-6 1.61E-5 3.42E-5 8.38E-5 10 1.16E-7 1.76E-7 8.54E-7 2.68E-6 1.41E-5 3.OOE-5 7.38E-5 Source: NUS (R.R. Bowers) calculations, dated 11/1/93.

[CEI Purchase Order No. C-901596]

3.2.4 -Divide each Xp/Q value by the wind speed to determine X/Q and record on the Meteorological Data Calculation Sheet.

3.2.5 Enter the data source, date, time and signature of the performer on the Meteorological Data Calculation Sheet.

EPI-B7b Rev.: 10 Attachment l1 Sheet 5 of 7 Page: 10 "METEOROLOGY AND ATMOSPHERIC DISPERSION (Cont.)

3.3 Direct Observation 3.3.1 Dispatch an individual to an onsite observation point in an area where the wind is not affected by buildings, structures, or other obstructions.

3.3.2 Estimate the wind directionl (from) by observation and the wind speed by using Data Table 1-3, and record this data on the Meteorological Data Calculation Sheet.

Data Table 1-3 Class Observation Approx. Wind Speed Calm Smoke rises vertically 1 mph Light Breeze Smoke drifts 1-3 mph Slight Breeze Leaves rustle, wind felt on face 4-9,mph Gentle Breeze Light flags extend!, leaves and 8-12 mph twigs in constant motion Moderate Breeze Small branches move, dust and 18 mph dirt stirred up Source: Meteorology and Atomic Energy (1968, USAEC Division of Technical Information]

3.3.3 Identify the Stability Class (A-G) associated with the observed wind speed and sky conditions using Data Table 1-2 (on the following page), and record on-the Meteorological Data Calculation Sheet.

CAUTION When uncertain about the choice of Stability1 Class based on local observations, choose the most-restrictive Stability Class that cannot be reasonably excluded. ,G is the most restrictive Stability Class, and A is the least restri'ctive Stability Class.

EPI-B7b Rev.: 10 'iAttachment1 S Sheet 6 of *7',-, Page: 11 METEOROLOGY AND ATMOSPHERIC DISPERSION (Cont.)

Data Table 1-2 Night Time Wind Speed Daytime Sun Strength Thin overcast > 50%

mph Strong Moderate Slight or,

• 50% low low cloud cloud cover cover

<4.5 A B B F G 4.5- 6.6 B B C E F 6.7-- 11.1 B C' C D E 11.2 - 13.4 C D D D D

>13.5 C D D D D Source: Meteorology ani "Information] Atomic Energy USkA.

U8, Division of Tecnnical 3.3.4 Determine the Xg/Q values for the site boundary, 2 miles, 5 miles, andi 10 miles, or distance of concern by using Data Table 1-1 to select the column which corresponds to the stability class; record

-these Xp/Q values onto the Meteorological Data Calculation Sheet.

Data Table 1-1 DISTANCE STABILITY CLASS (miles) A B C D E F G Site Boundaryý 1.10E-5 5.66E-5 1.45E-4 3.63E-4 6.61E-4 1.09E-3 1.66E-3 1 1.86E-6 1.70E-5 4.94E-5 1.36E-4 3.02E-4 5.67E-4 1.06E-3 2 4.49E-7 4.35E-6 1.46E-5 4.25E-5 1.18E-4 2.38E-4 5.21E-4 3 3.17E-7 "-1.95E-6 7.11E-6 2.12E-5 6.79E-5 1.40E-4 3.23E-4 4 2.49E-7 1.10E-6 4.28E-6, 1.30E-5 4.61E-5 9.61E-5 2.27E-4 5 2.06E-7 7.06E-7 2.89E-6 8.83E-6 3.43E-5 7.20E-5 1.73E-4 6 1.77E-7 4.90E-7 2.09E-6 6.46E-6 2.70E-5 5.70E-5 1.38E-4 7 1.56E-7 3.60E-7 1.60E-6 4.95E-5 2.21E-5 4.68E-5 1.14E-4 8 1.39E-7 2.76E-7 1.26E-6 3.94E-6 1.86E-5 3.96E-5 9.67E-5 9 1.26E-7 2.18E-7 1.03E-6 3.21E-6 1.61E-5 3.42E-5 8.38E-5 10 1.16E-7 1.76E-7 8.54E-7 2.68E-6 1.41E-5 3.OOE-5 7.38E-5 Source: NUS (R.R. Bowers) calculations, dated 11/1/93.

[CEI Purchase Order No. C-901596]

3.3.5 Divide each Xp/Q value by the wind speed to determine X/Q and record on the Meteorological Data Calculation Sheet.

3.3.6 Enter the data source, date, time, and signature of performer on the Meteorological Data Calculation Sheet.

EPI-B7b Rev.: 10 Attachment 1W' Sheet-7 of 7 Page: 12 METEOROLOGICAL DATA CALCULATION SHEET PNPP No. 8036 Rev. 1119/00 EPI-BM DATE TIME DATA SOURCE LOCATION OF OBSERVATION (ifapplicable) TIME OF OBSERVATION (if applicable)

SIGNATURE  :,REVIEWED BY' wIND DIRECTION (To) +1800 =:WIND DIRECTION (From)

WIND SPEED' (mph)

L~II STABILITY CLASS (A-G)

- IF REQUIRED TO DETERMINE STABILITY CLASS:

DIFFERENTIAL TEMPERATURE'(AT)

(°F/50rg)

IZ WIND STANDARD DEVIATION (a 6) xu X/Q for each distance Q for each distance DIVIDE BY THE WIND (sIM3)

Site Site Boundary jSPEED Boundary 2 mi. 2mi.

5mi. .5mi. __

10 mi. 10mi.

M mi. . mi.

/

EPI-B7b Rev.: 10 ' Attachment 2 Sheet 1 of 6 Page: 13 DOSE CALCULATIONS BASED ON ELEVATED EFFLUENT MONITOR READINGS 1.0 PURPOSE <L00063>

This attachment provides a method for using effluent monitor readings to project dose rates at selected downwind locations.

2.0 PREREQUISITES 2.1 The following data must be~available for this method:

2.1.1 Effluent Monitor Reading, in cpm or pCi/cc Xe-133 equivalent, for effluent release pathway(s) of concern.

2.1-2 Effluent Flow Rate, in kcfm, for effluent release pathway(s) of concern.

2.1.3 MET data from Perry Meteorological Tower or obtained using alternate sources per Attachment 1.

3.0 ACTIONS 3.1 Perform the following calculation for each plant vent only when a valid HIGH Alarm is received on an effluent radiation monitor (on the low range noble ga's channel).

3.1.1 Check the plant vent for which the calculation is being performed, and record this data on the Effluent Monitor Reading Calculation Sheet.

NOTE:- A separate calculation must be completed for each plant vent

-pathway of concern.

3.1.2 Enter the X/Q value for the Site Boundary obtained using Attachment 1 into block A.

3.1.3 Enter monitor reading'-for the on-scale vent monitor range into block B.

3.1.4 Using Data Table 2-1, enter the appropriate monitor conversion factor into block C.

3.1.5 Enter the expected release duration (hours) into block D.

NOTE: Use 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> (default) if release duration is not known. If the release has been terminated, use the actual duration of the release or '1' (whichever is greateri.

EPI-B7b Rev.: 10 Attachment 2, Sheet 2 of 6 Page: 14 DOSE CALCULATIONS BASED ON ELEVATED EFFLUENT MONITOR' READINGS. (Cont.)

3.1.6 Enter the vent flow rate (kcfm) into block E.

-- If vent flows are not available from the ICS- use Data Table 2-2 to estimate flow out-the affected vent(s).

3.1.7 Multiply block A x B x C x D x E x 1000; enter value obtained into block F. (This is the Site:Boundary TEDE dose.),

3.1.8 Identify the applicable vent reduction (partition) factor from the Data Table 2-3; enter into I5lock G.

.3.1.9 Multiply block F by block G; enter product into block'H. ,[This is the site boundary CDE - CHILD THYROID (CDEct) dose.]

-- If block F is less than 1.0 rem and block H is less than 5.0 rem, no protective actions are required'. NO FURTHER ACTION REQUIRED (unless multiple vent radiation monitors are in alarm).

If block F is greater than or equal to 1.0 rem OR block H is greater than or equal t'o 5.0 rem, protective actions are required. CONTINUE WITH STEP 3.1.10 ON PAGE 15.

DATA TABLE 2-i <L00438, L00474>

MONITOR CCNVERSION FACTORS "Unit 1 Break Outside OCNDITICN PNGE Unit 1/2 Unit 1/2 Unit 1 Unit 1/2 CNThU LOA in ICtA in., MAin EM in Auxiliary TB/HB Off-Gas Drywell QImTh FEB aqM - Bldg.

Low range HI HIGH 1.56E-2 2.13E-2! 1.62E-2 1.56E-2 2.13E-2 5.95E-1 2.13E-2 alanm, and high (1Ci/

range > 10 pCi/cc cc) _ _ ° Low range HI MID 2.72E-2 3.70E-2, 2.82E-2 2.72E-2 13.70E-2 1.03E+O 3.70E-2 alann, and high (tCi/

range < 10 ýCi/cc; cc) mid range > 0.05

ýCi/cc _

Low range HI alanm Im 3.07E-9 4.17E-9 3.17E-9 3.07E-9 4.17E-9 1.17E-7 4.17E-9 Source: Validation & Verification Report for the Perry Plant CADAP, dated 11/15/93. [Pacific Nuclear'Systems, Inc./mbs Consulting Partners]

Legend: CNTMT - Containment FHB - Fuel Handling Building FHA - Fuel Handling Accident LOCA - Loss of Coolant Accident TB/HB - Turbine Building/Heater Bay

EPI-B7b Rev.: 10 Attachment'2 Sheet 3 of;6 , Page: 15 DOSE CALCULATIONS BASED ON ELEVATED EFFLUENT MONITOR READINGS (Cont.)

Data Table 2-3 VENT PARIITION FACTORS Unit 1 Unit 1/2 Unit 1/2 Unit 1/2 Unit 1/2 Break LOCA in I in FA in FHB FHA in Outside Drywell CNTT CNTMT CNTMT TB/HB Off-Gas 0.318 9.37 1.54 0.318 9.37 33.5 9.37 Source: Validation & Verification-Report for the Perry Plant CADAP, dated 11/15/93. [Pacific Nuclear Systems, Inc./mbs Consulting Partners]

Legend: CNTMT - Containment FHB - Fuel Handling Building FHA - Fuel Handling Accident LOCA - Loss of Coolant Accident TB/HB - Turbine Building/Heater Bay NOTE: For following data is for information only. It is not used in manual dose calculations. These factors are applied by the automated dose calculations.

ACCIDENT/RELEASE PATH SPECTRUM FHA IN CNTMT 0.01 PARTITION FACTOR-POOL SCRUBBING LOCA IN DW 0.01 FILTRATION FACTOR-AEGTS/CNTMT VENT.

FHA IN FHB 0.01 PARTITION FACTOR-FUEL POOL SCRUBBING 0.05 FILTRATION-FHBVS LOCA IN CNTMT 0.4 PARTITION FACTOR-PRI. SYSTEM PLATEOUT BREAK OUTSIDE CNTMT/AUX BLDG 0.i FILTRATION FACTOR-AEGTS/CNTMT-AB VENT OFF-GAS VENT 0.4 PARTITION FACTOR-PRI. SYSTEM PLATEOUT 0.01 FILTRATION FACTOR-OG SYSTEM TURBINE BLDG/HEATER BAY VENT 0.4 PARTITION FACTOR-PRI. SYSTEM PLATEOUT COMMON ASSUMPTIONS: C]LAD DAMAGE SPECTRUM/2-HOUR DECAY TIME 3.1.10 Record the X/Q values for 2-, 5-, and 10- miles (determined in Attachment 1) into appropriate blocks at the bottom of Effluent Monitor Reading Calculation Sheet.

3.1.11 Divide the SB doses (blocks F & H) by block A; then multiply by applicable X/Q values to determine doses at 2-, 5-, and 10- miles.

3.2 When multiple vent pathways-are being calculated (i.e., steamline break in the Steam Tunnel), sum the TEDE and CDEct (child thyr6id) doses on the Effluent Monitor Reading Calculation Sheet(s) to determine a total exposure at the SB, 2-, 5-, and 10- miles.

EPI-B7b Rev.: 10 Attachment 2 Sheet 4 of 6 Page: 16 DATA TABLE 2-2 PNPP No. 8041 Rev. 1112/01 I:::DII*TK UNITI 'UNIT 2 UNITI UNIT I PLANT VENT PLANT VENT TBIHB VENT OFF GAS VENT System Name Fan Flow Rate System Name - Flow Rate System Name Fan Flow Rate System Name Fan Flow Rate

- Indicator# (kcfm) Fan Indicator# (kcfm) Indicator# (kcam) Indicator# (kcfm)

,.FuelHandling Bldg. Intermediate Bldg. .Heater Bay Off-gas Building M40-CO02A 1.65 El (4) M33-C002 3.01 El 1M41-CO02A 2.18 E2 (3, 7) 1M36-C001A 1.65 El (6)

M40-C002B 1.65 El (4) Controlled Access 1.98 E2 1M36-C001B 1.65 El (6)

M40-CO02C 1.65 El (4) And Misc. Equip.

Smoke Venting --------- Areas --------- 1M41-CO02B 2.18 E2 (3, 7)

System M21-CO01A 1.65 El 1.98 E2 Misc. Elec. Areas M21-CO01B 1.65 Ell 1M49-COOIA 1.10 El (5) AEGTS 1M49-COO1B 1.10 El (5) 1M15-COOIB 7.00 E1/1.00 EO (1,6)'

,_Radwaste Builidng - -. -.. .... . . Service Bldg.. ,- - - . ...

M31-C002A 3.30 El (6) HotMach. Sho.

M31-C002B- 3.30 El (6) OM54-C001 .1.32 El (8)

..A.uxili.ry ldng 4 M38-CO03A 3.36 El (6)

M38-C002B 3.36 El (6)

Containment Purge/Containment

-And Dryw.e. Pure 1M14-C003A 5.50 E0/1.65 El (2) .... ,

1M14-C003B 5.50 E011.65 El (2)

AEGTS IM15-CO01A 7.00 El/11.00 E0 (1,6) 1 TOTAL: TOTAL: TOTAL: TOTAL: .

(1) Normal flowrate I LOCA flowrate., - (5) Used only for Smoke Clearing (Normal flow = 0 kcfm).

(2) Normal flowrate in Intermediate Mode I flowrate in Refuel Mode. (6) Only I of 2 fans operate at any time.

(3) Louvers open flowrate / Louvers closed flowrate. (7) Actual combined Summer flowrate from 1M14-C002A & B is 3.80 E2 kcfm +10%

(4) Only 2 of 3 operates at 3.0 El0 kcfm total.

• Instrument error).

(8) Via 2M38 ductwork.

Source: Technical Basis Package for Alternate Offsite Dose Calculation (NUS Corporation File No. 2065-49)

'C -

EPI-B7b Rev.: 10 Attachment 2 Sheet 5 of 6 Page: 17 C'

EFFLUENT MONITOR READING CALCULATION SHEET PNPP No. 9429 Rev. 7/18/02 EPI-BTh USER INSTRUCTIONS: Complete a separate sheet for each applicable release pathway (vent) and summarize pathway results on page 2 of form

1. _: RELEASE PATHWAYNENT: El Unit I 0] Unit 2 E] Turbine Building/Heater Bay (TB/HB) E] Off-gas TIME OF READING:

TOTAL EFFECTIVE DOSE EQUIVALENT (TEDE):

X X X _ X X1000 =_ REM TEDE (A) (B) (C) (0) (E) (F)

X/Q @ Site Boundary Monitor Reading Monitor Conversion Factor Release Duration Flow Rate TEDE Dose @ Site Boundary (Data Table 2-1) (in hours) (kcfm)

IF TEDE DOSE @ SITE BOUNDARY IS GREATER THAN I REM, PERFORM THE FOLLOWING RATIOS, USING THE TABLE BELOW, TO DETERMINE TEDE DOSE AT 2, 5 & 10 MILES.

COMMITTED DOSE EQUIVALENT - CHILD THYROID (CDEct):

X, = REM CDEct (F) (G) (H)

TEDE @ SB Vent Partition Factor CDEct Dose_@ Site Boundary IF CDEct DOSE AT THE SITE BOUNDARY IS GREATER THAN 5 REM, PERFORM THE FOLLOWING RATIOS, USING THE TABLE BELOW, TO DETERMINE CDEct DOSE AT 2, 5 & 10 MILES. '___ ___

TEDE DOSE RATIOS: (ifapplicable) CDEct DOSE RATIOS: (if applicable)

(____ __)X = REM @ 2 mi (_ __ )X__ REM @ 2 mi (F) (A) X/Q @ 2 mi (H) (A) XIQ @ 2 ml TEDE @ SB X/Q @ SB CDEct @ SB X/Q @ SB X = REM @ 5 mi X - REM @ 5 ml XIQ @ 5 ml XIQ @ 5 mi X = REM@10mi X

• REM@10mi X/Q @ 10 mi XIQ @ 10 ml PERFORMED BY: TIME/DATE: - REVIEWED BY: TIME/DATE:

I I

EPI-B7b Rev.:

I 10 Attachment 2 Sheet 6 of 6 Page: 18 EFFLUENT MONITOR READING-CALCULATION SHEET (Cont.)

F PNPP 9429 Rev. 07118/02 EPI-B7b USER INSTRUCTIONS: Use Page 2 of form to total doses for multiple release pathways (vents).

TEDE DOSES:

Vent Vent Site Boundary + = "REM 2 Miles: +

=_ REM 5 Miles: + S= ", REM 10 Miles: +

=_ REM Miles: +

__ _= REM CDE ct DOSES:

Vent, Vent Site Boundary + REM 2 Miles: + REM 5 Miles: + REM I 10 Miles: -I. _ _ _ REM

-I Miles: + REM PERFORMED BY: ___TIME/DATE:

REVIEWED BY:. TIME/DATE:

1'

EPI-B7b Rev.: 10- Attachment 3-- Sheet 1 of 10, Page: 19 DOSE CALCULATIONS BASED ON FIELD MEASUREMENTS 1.0 PURPOSE This attachment provides a method for projecting dose rates at selected downwind locations using offsite °dose rate measurements or off-site iodine samples.

2.0 PREREQUISITES 2.1 The following data must be available for this method:

2.1.1 MET data including X/Q (for each distance), wind speed and wind direction.

2.1.2 For calculation of whole body dose rates, a dose rate reading at a point determined to be approximately in the centerline of the plume.

2.1.3 For calculation of CDEct (Child thyroid), a reading from an air sample taken at the selected location.

3.0 ACTIONS 3.1 RMT Field Measurement Calculation (Whole Body Dose Rate Reading) 3.1.1 Record the measurement location, wind direction (from), distance from plant, and measurement time-in the heading of the RMT Field

- Measurement Calculation Sheet.

3.1.2 Convert the measured dose rate, taken at a point approximately in the centerline of the effluent plume, from mrem/hr to rem/hr and record in block A of RMT Field Measurement Calculation Sheet.

3.1.3 Obtain the X/Q values for the actual sample location, and the site boundary, 2 mi., 5 mi., and 10 miles from Attachment 1 of this instruction.

If the measurement was not taken'at the site boundary ora whole mile increment, round the distance up to the next highest mile.

3.1.4 Record the X/Q value for the sample location in block B, and the X/Q values for the site boundary, 2 mi., 5 mi., and 10 miles in block F of RMT 'Field Measurement Calculation Sheet.

3.1.5 Divide the measured dose rate (block A) by the X/Q for the sample location (block B) and record the result in block C.

-f EPI-B7b Rev.: 10 Attachment 3.1 Sheet- 2"of 10 Page: 20 I,

DOSE CALCULATIONS BASED ON FIELD.MEASUREMENTS (Cont.)

3.1.6 Choose the most appropriateigamma to TEDE conversion factor from the table below, and enter in block D. For elapsed times greater than 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, an air sample analysis shall be used to more accurately account for inhalation dose.'

__ DATA TABLE 3-1 Time Less Than 4% 0 .5 1 2 4 6 8 Power (in hours)

Gamma-TEDE Factor 1.09 1.16 1.22 1.29 1.43 1.59 1.75 Source: Validation & Verification Report for the Perry Plant CADAP, dated 11/15/93. [Pacific Nuclear Systems, Inc./mbs Consulting Partners]

"3.1.7 Record the release duration, in hours, in block E.

3.1.8 Calculate the TEDE dose rates for each distance by multiplying values in blocks C x D x E x F together. Enter the results for each respective distance in block'G.

3.1.9 Enter the date, time and signature of the person who performed the calculations.

3.2 RMT Air Sample (Iodine) Calculation 3.2.1 Record the measurement location, wind direction, distance from plant, and measurement time on the RMT Air Sample Calculation Sheet.

3.2.2 Evaluate the filter paper surrounding the'sample canister, by performing the following:

1. Determine the number of' hours at less than 4% power.

-- If the reactor is not <4% power, or if it has not been <4%

for at least one hour, use one hour.

2. Use Figure 3-1 to find the Iodine Correction Factor (CF).

3. Calculate the total fission product activity on the filter by determining the difference (D) in the~filter-adsorber and-bare adsorber readings.

4. Calculate the corrected filter reading at the time of the measurement due to iodihe by multiplying the correct CF x D.

3.2.3 Evaluate the canister filter-adsorber, by performing the following:

1. Determine the adsorber net counting rate (N) by subtracting background (B) from the bare adsorber measurement (G), i.e., the adsorber canister with the filter paper removed. [N = G - B]

EPI-B7b Rev.: 10 Attachment, 3 Sheet 3 of 10. Page: 21 DOSE CALCULATIONS BASED ON FIELD MEASUREMENTS (Cont.)

2. Add the corrected filter reading (F) to the net adsorber reading (N) to obtain the total-iodine counting rate (R). [R = F +,N]

3. Use Figure 3-2 to determine the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Child Thyroid Dose, Commitment.

4. If the immersion time is greater than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, use Figure 3-3 to determine the correction factor by which to multiply the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> immersion dose commitment value.

3.2.4 Determine the Child Thyroid dose received at the site boundary, 2 mi., 5 mi., and 10 miles by performing the following using the RMT Air Sample Calculation'Sheet.

1. Record the Child Thyroid Dose Commitment (Rem) in block A on Part II of the RMT Air Sample Calculation Sheet.

2. Obtain the X/Q values for the actual sample location, and the site boundary, 2 mi., 5 mi., and 10 miles from Attachment 1 of this instruction.

If the measurement was not taken at the site boundary or a whole mile increment, round the distance up to the nearest mile.

3. Record the X/Q value for the sample location in block B, and the X/Q values for the site boundary, 2 mi., 5 mi., and 10 miles in block D.

3.2.5 -Divide the projected thyroid dose (block A) by the X/Q for the sample location (block B) and record the results in block C.

3.2.'6 Calculate the dose for each distance by multiplying the entry (block C) by the X/Q for each indicated distance (block D). Enter the results for each respective distance in block E.

3.2.7 Enter the date, time and signature of the 'person who perfornmed the calculation.

-3.3 RMT Sample Analysis Calculation 3.3.1 When the analysis results are obtained, enter the iodine concentrations in pCi/cc in block B on the RMT Sample Analyses Calculation Sheet.

3.3.2 Enter the X/Q for the sampled-location obtained using Attachment 1 in block C.

/

3.3.3 Calculate the release rate by dividing each entry in block B by the value in block C; enter the results in block D. -

I-l EPI-B7b Rev.: 10 Attachment 3ý Sheet 4 of 10 *Page: 22 DOSE RATE ASSESSMENT BASED ON FIELD MEASUREMENTS (Cont.)

3.3.4 Multiply the values in blockD by the'values inblock E; enter the V results in blocks F.

3.3.5 'Sum block F values for each isotope listed to obtain a modified dose factor for further calculations.

3.3.6 Enter the X/Q for the Site Boundary, 2 miles, 5 miles and 10 miles in block G.

3.3.7 Calculate the dose rates for each distance by multiplying the entry in block F times the entries in block G; record the results in block H.

3.3.8 If required,_sum block D values for each isotope listed to obtain the total release rate in Ci/sec.,

3.3.9 Enter the date, time, and signature of the person who performed the calculations.

41

.1i

EPI-B7b Rev.: 10 Attachment 3 Sheet 5 of 10,ý,Page: 23 RMT FIELD MEASUREMENT CALCULATION SHEET EPI-B7b N INUrl,. 5u049 rixv. I uw1UU DATE TIME MEASUREMENT LOCATION DISTANCE FROM PLANT (mi)

WIND DIRECTION (from) - MEASUREMENT TIME SIGNATURE REVIEWED BY A B C D E F G Measured Dose X/Q for Actual Fractional X/Q Gamma Release X/Q for each TEDE Dose (rem)

Rate at Sample Sample Location TEDE Duration Distance Location (NB) Factor (Hours) (CxDxExF)

(rem/hr) site Boundary Note: Measured Dose Rate is taken -in mrem/hr and must be converted to rem/hr. 2 ml.

5 mi.

10 ml.

DATA TABLE 3-1 Time Less Than 4% Power 0 0.5 1.0 2.0 4.0 60 80 (in hours)

Gamma-TEDE 1.59 1.75, 1.09 1.16 1.22 1.29 1.43 Factor _ * -

• I__________________

EPI-B7b Rev.: 10 Attachment 3, Sheet-6 of 10 Page: 24 RMT AIR SAMPLE CALCULATION SHEET PNPP No. 8050 Rev. 11/93 EPI-B7b DATE TIME MEASUREMENT TIME MEASUREMENT LOCATION DISTANCE FROM PLANT (mi) *,WIND DIRECTION (from)

• SIGNATURE i REVIEWED BY  :

(FILL OUT FOR EACH AIR SAMPLE)

PART 1: GLASS FILTER CLOTH EVALUATION Step 1: Time of measurement - Reactor < 4% power = hrs Step 2: (from Figure 3-1) Iodine Correction Factor = , [CF]

Step 3: Filter-adsorber reading _ _ _ cpm - Bareadsorber reading cpm cpm [D]

Step 4: Step 2 [CF] x Step 3 [D] __ = cpm Corrected Filter Reading [F]

FILTER-ABSORBER EVALUATION Step 5: Bare-absorber reading cpm - Background cpm = cpm Absorber Net Count Rate [N]

Step 6: Step 4 [F] cpm + Step 5 [N] " _ cpm = cpm

[R] Total Iodine Count Rate Step 7: THYROID DOSE COMMITMENT (from Figure 3-2) rem.

Step 8: (if immersion time greater than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />):i Thyroid dose correction factor (Figure 3-3) .. x Thyroid dose commitment (Step 7) _ _=- rem.

4 PART Ih: 1. 4 A. B CD E Thyroid dose at X/Q for Actual Fractional X/Q for each Thyroid Dose Sample Location Sample Location X/Q Distance (rem)

(rem) (A/B) J (CxD)

Site

,__ _Boundary I.2 mi.

5mi.

l mi. j

C Cz EPI-B7b Rev.: 10 Attachment 3 Sheet 7 of 10 Page: 25 IODINE CORRECTION FACTOR GRAPH TIME SINCE REACTOR POWER <4%

a... . i.3 a:

wr a:

0r C3)

1) Obtain the elapsed time since reactor power less than 4% (in hours). Locate the value on the horizontal axis. If between lines, use the next lowest line.

2) Locate the point of intersection'from the horizontal'axis to the graph BWR line.

3) From the point of intersection, locate thd Iodine Correction Factor on the vertical axis. If between lines, use the next highest line.

Figure 3-1

EPI-B7b Rev.: 10 Attachment 1 Sheet 8 of 10 Page:-, 26 CHILD THYROID DOSE COMMITMENT GRAPH 301 102 1 103 10e I05 102 w

101 8.

93" 100 100 0

a:

'10-1 1 10 - ".

TOTAL IODINE COUNT RATE (CPM)

NOTE: Thyroid dose commitment for a 5 year old child for a 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> inhalation duration.

1) Obtain the Total Iodine Count Rate (R) from Step 6. ýLocate the value on I.

the horizontal axis. If betweenlines, use the nextl highest line.

2) Obtain the.elapsed time since reactor power less than 4% (in hours).

Identify the approximate graph line corresponding to this value. If between lines, use the next highest line.

3) From the point of intersection, locate the Thyroid Dose Commitment on the vertical axis. If between lines; use the next highest line.

Figure 3-2

'1 EPI-B7b Rev.: 10 Attachment'3 Sheet 9 of 10 Page: 27

,-YINHALATION DECAY GRAPH 0 2 3 5 10 15 20 30 50 70 100 300.0, I I -I 300.0ý-

30.0 20.0 I 15.0 10.0 7.0 3.0 2.0 1.5 1.0 U Z 3 1.o 15 ZO 10 o0 70 100 IMMERSION TIME (HOURS).

1i) Obtain the Immersion Time, in hours. Locate the value on the horizontal axis. If between lines, use the next highest line.

2) Locate the limit of intersection from the horizontal axis to the graph line.*

3) From the point of intersection, locate the Correction Factor on the vertical axis. If between lines, use the next highest line.

Figure 3-3

EPI-B7b Rev.: - 10 Attachment 3 Sheee 10- of 10 Page: 28 "RMTSAMPLE ANALYSIS CALCULATION SHEET PNPP No. 8052 Rev. 11/93 EPI-B7b DATE TIME MEASUREMENT LOCATION DISTANCE FROM PLANT (mi)

WIND DIRECTION (from) MEASUREMENT TIME SIGNATURE REVIEWED BY A B C DE F G H Isotopic Sample X/Q for Release Dose Modified X/Q for Dose Rate Analyses Conc. Sampled Rate Factor (1) Dose each Child Distance pCilcc Location Ci/sec Factor distance Thyroid (B/C) (DxE) rem/hr (FxG) 1-131 2.78E+6 1-132 3.31 E+4 1-133 6.58E+5 1-134 8.67E+3 1-135 1.35E+5 Site Sum 1 I I.-

Boundary Block F's 2 mi.

5 mi.

NOTE: Ifrequired, sum block D's to obtain Total Release Rate. 10 Hl.

(1) Source: Technical Basis Package for Alternate Offsite Dose Calculations

[NUS Corporation File No. 2065-49]

EPI-B7b Rev.: 10 'Attachment-4 Sheet 1 of 3 Page: 29 CALCULATION OF ACCUMULATED DOSE 1.0 PURPOSE This attachment provides instructions for calculating the accumulated doses following a significant accidental release of radioactive materials. It depends on dose rate input from calculations performed in accordance with the methods of Attachments 2 or 3, and may also be used with dose rate data from <EPI-B7a>.

2.0 PREREQUISITES 2.1 Dose rate results calculated in accordance with the methods of Attachments 2 or 3, or from CADAP (EPI-B7a).

3.0 PROCEDURE 3.1 A separate Accumulated Dose Calculation Sheet will be initiated for each sector.

3.2 On each Calculation Sheet, enter the accident type, release path(s) (if identified), release duration, and the sector of concern.

3.3 Enter the method (Attachment number) used to perform the dose rate calculation in block A.

3.4 'Enter the time of the current monitor reading upon which the calculation was based (or the time that the sample was taken if the data is not based on a monitor reading) in block B. Copy this data from the appropriate dose rate calculation sheet.

3.5 Calculate the time since the last monitor reading or sample, in hours, and enter the results in block C.

• For the initial time for the first entry it is the elapsed time from the start of the accident to when the monitor is read.

3.6 Divide TEDE and child thyroid doses by the release duration (used to calculate them) to obtain dose rates.

3.7 Transfer the TEDE and child thyroid dose rates for the applicable distances from the Calculation Sheets (or CADAP Summary prints) to block D.

"3.8 Calculate the dose that occurred during the time interval A Time by multiplying block C times block D and entering the result in block E.

3.9 Calculate this accumulated dose by summing the TEDE and child thyroid entries in block E for each distance, and entering the total in block F.

EPI-B7b1ý Rev.: 10- Attachment 4i Sheet 2 of 3 Page:* 30 CALCULATION OF ACCUMULATED DOSE (Cont.)

3.10 Transfer the direction (wind from) entry from the appropriate Calculation Sheets (or from CADAP) to block G.

3.11 Enter the date, time, and signature of the person who performed the calculations in the spaces provided when the calculations are'completed.

3.12 Calculate new accumulated doses as required'.

-t 4 4 4

-NI

EPI-B7b Rev.: 10 Attachment' 4 Sheet 3-of 3 Page: 31 - LAST ACCUMULATED DOSE CALCULATION SHEET PNPP NO. 8054 Rev. 11/93 A B C D .E F G CALC. TIME OF TIME SINCE PROJECTED ACCUMULATED WIND DIRECTION 0

METHOD MONITOR LAST MONITOR DOSE RATES DOSE DURING DOSE (SUM OF BLOCK FFROM)

(2, 3 READING READING OR remlhr ATIME EVALUES FOR TEDEICT ON WHICH DOSE SAMPLE DOSE (Cx 0) PROJECTION IS OR CADAP) OR SAMPLE -HRS RELEAE DURO FOR EACH DISTANCE) BASED TEDE CT 2 TEDE ML CT 5 TEDE ML cr__ _ _ _

10 TEDE MI. CT 5 SCT__

TEDE 2 TED E .... ______

MI. cT 5 TED!

ML. CT ______

10 TEDE MLcr ssTED! ________

7 TEDE ML CT 5 TEEDE Mi. cr 1 TEDE M.cr ss TEDE 2 TEDE MI. CT 5 TEDE ML CT 10 TEDE MlICT SB TEDE CT 2 TEDE MI. CT 5 TEDE

!10 TEDE ML cT