ML20052B579
| ML20052B579 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 04/05/1982 |
| From: | TOLEDO EDISON CO. |
| To: | NRC |
| Shared Package | |
| ML20052B576 | List: |
| References | |
| NUDOCS 8205030317 | |
| Download: ML20052B579 (2) | |
Text
_
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DAVIS-BESSE REVISION COVER SHEET
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APR 51982 ks' f
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FROM: ENERG. PLANNING & PREPAREDNESS SUPV.
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SUBJECT:
Davis-Bessa EMERCENCY PLAN SUPPORTING PROCEDURES Manual Changes This latter transmits additions and revisions to the Davis-Besse EMERGENCY PLAN SUPPORTING PROCEDURES Manual.
Control Copy Instructions for the material are as follows:
REMOVE AND RETURN INSERT Revision Index, Rev. 135 Revision Index, Rev. 136 AD 1827.12.6 AD 1827.12.7 Date Ravision Entered Addresuae Signature RL'IURN TO THE OFFICE MANAGER STOP #3050 f00b
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DAVIS-BESSE REVISION COVER SHEET APR 51982 DATE Jhl1 M} 40tr. K0A b!T rX TO:
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FROM: EMERG. PLANNING & PREPAREDNESS SUPV.
SUBJECT:
Davis-Besse EMERGENCY PLAN SUPPORTING PROCEDURES Manual Changes This letter transmits additions and revisions to the Davis-Desse EMERGENCY PLAN SUPPORTING PROCEDURES Manual.
Control Copy d d b.
Instructions for the material are as follows:
ItEMOVE AND ITTUltN INSEltT Revision Index, Rev. 135 Revision Index, Rev. 136 AD 1827.12.6 AD 1827.12.7 Date Revision Entered Addressee Signature l
RETURN TO THE OFFICE MANAGER STOP #3050
THE TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION EMERGENCY PLAN SUPPORTING PROCEDURES REVISION INDEX PAGE REVISI0N PROCEDURES
, REVISION TEMPORARY MODIFICATIONS l
i 5
AD 1827.01 2
T-6020 AD 1827.02 7
T-5917 AD 1827.03 1
AD 1827.04 1
T-6019 AD 1827.05 2
AD 1827.06 2
AD 1827.07 2
AD 1827.08 1
AD 1827.09 1
AD 1827.12 7
AD 1827.13 4
AD 1827.14 1
AD 1827.15 3
AD 1827.16 1'
AD 1827.17 1
AD 1850.04 3
AD 1850.05 5
ADMINISTRATIVE MEMORANDUMS REVISION No. 37 - ECS Pager and Telephone Numbers 25 l
No. 38 - First Aid Team 11 No. 39 - Fire Brigade 12 No. 41 - Emergency Duty Officer (EDO) 23 No. 42 - Radiation Monitoring Teams (RMI) 13 1
Revision 136 l
p{
April, 1982 geo43OOO3I
_,e m ese reee:
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." D O O " 0 0 0 0 N W
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a i
THE *ID!.EDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION EME*ENCY PLAN SUPPORTING PROCEDURES REVISION INDEX PAGE REVISION PROCEDURES REVISION TEMPORARY MODIFICATIONS i
AD 1827.01 2
T-6020 AD 1827.02 7
T-5917 AD 1827.03 1
AD 1827.04 1
T-6019 AD 1827.05 2
t AD 1827.06 2
AD 1827.07 2
AD 1827.08 1
AD 1827.09 1
AD 1827.12 7
AD 1827.13 4
AD 1827.14 1
AD 1827.15 3,
AD 1827.16 1
h AD 1827.17 1
AD 1850.04 3
i AD 1850.05 5
I
- L t
ADMINISTRATIVE MEMORANDUMS REVISION No. 37 - ECS Pager and Telephone Numbers 25
]
No. 38 - First Aid Team 11 li No. 39 - Fire Brigade 12 No. 41 - Emergency Duty Officer (EDO) 23 i
No. 42 - Radiation Monitoring Teams (RMI) 13 I
i Revision 136 April, 1982 l
Davic-3csco Nuclear Po.:cr Station
'N Unit No. 1 (v)
Ad=inistrative Precedure AD 1827 12 Protect 1re Actica Ouldelines J
I a
j Record of Approval and Changes Prepared by C. Doyel/W. Green 2/23/76 Date Submitted by E_L1 b tw 3 / i i / 7 d, Synon lland Date
)Recowended by M
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d
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SRB Chairman bate 4
d A ~ deh
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QA Approved V
Man ger Mualit/A'fsurance Date t
[d d M Approved by
~ Btifion Superintendent Date Revision SRB QA S ta. Supt.
No.
Re om.cn ' gon' Date Approved Date Appresa Date h
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1 AD 1827.12.6 9.
PURPOSE To define a specific set of guidelines to be followed in determin-ing protective actions to be taken in the event of emergencies involving radioactivity releases at the Davis-Besse Nuclear Power Station (DBNPS).
2.
REFERENCES 2.1
- 10 CFR 20, Standards for Protection Against Radiation 2.2 10 CFR 100, Reactor Site Criteria 6
2.3 USAEC TID-14844, Calculation of Distance Factors for Power and Test Reactor Sites 2.4 AD 1808.00, Industrial Security Plan 2.5 Davis-Besse Nuclear Power Station Emergency Plan 2.6 AD 1827.10, Emergency Off-Site Dose Estimates 2.7 SANI) 77-1725, Public Protection Strategies for Potential Nuclear Reactor Accidents - Sheltering Concepts with Exi. sling Public and Private Structures I
I 2.8 EPA Guidelines - September 1975, EPA-520/1-75-001 2.9 U.S. Food and Drug Administration, Federal Register, Vol.
43, No. 242, Dec. 15, 1978 2.10 Reg Guide 1.109, Calculation of Annual Doses to Man f rom Routine Releases of Reactor Effluents for the purpose of Evaluating Compliance with 10 CFR Part 50 Appendix I 21FINIT10NS 3.
2 6
3.1 Decision Dose That value of projected thyroid dose above which evacua-tion is beneficial.
3.2 Evacuation Dose That dose that a potential evacuee would receive if he were openly exposed during the evacuation.
3.3 Evacuation Exposure Period The period during which the evacuee is exposed to the i9 i
radioactive plume.
L
2 AD 1827.12.7 3.4 Off-Site The area outside the Cwner Ccatrolled Area as defined in AD 1808.00, Industrial Security Plan.
3.5 Projected Exposure Time That period of time in which the population surrounding DBNPS will be exposed to radiation as a result of an accidental airborne radioactive release.
Proj ec ted Exposure Time starts when the airborne radioactivity released crosses the Owner Controlled Area Boundary and ends when radiation levels off-site return to normal.
3.6 Sheltering Dose That dose that an individual would receive if he were to remain within a shelter having ventilation control during the passage of the plume.
The method of calculating the sheltering dose is significantly different for the whole body and thyroid dose.
This is because a ventilation controlled shelter, i.e. door, windows and ventilation shut, provides thyroid protection for only two hours.
After two hours the inhabitant receives the full thyroid dose For the whole body exposure there is no limit on the resident's time in the shelter.
4.
RESPONSIBILITIES 4.1 In the event an emergency is declared at DBNPS that involves the release of radioactivity or radiation, the Emergency Duty Officer (EDO) and his assisting personnel shall use the calculating methods found in AD 1827.10, Emergency Off-Site Dose Estimates, to calculate the instantaneoua radiation exposure rates for various offsite locations.
(In the event o f an emergency during of f-normal hours, this calculation is the responsibility of the Shift Supervisor while acting as EDO until such time as he is relieved by the EDO.)
The results of these calculations shculd be utilized as specified in Section 6. for evacuation and shelter recem-mendations, and compared with the guidelines given in Sections 5. and 7.
to determine the proper protective act ions rc<pii red t o protect the heatth and salety ul
/
Station personnel and the general public.
lloweve r, in the ev: :t that time ducs not permit the use of the Section 6 Data Sheets (i.e.,
if the plume is moving relatively fast towards the public and especially large population centers),
protective actions should be based on an immediate com-pa rtson of the dose projectio.v calculated in AD 1827.10 with the criteria given in Section 5.1 of this procedure.
_. ~. _.
3 AD 1827.12.7 1
l
'N The'EDO shall then implement those actions for Station
,)
perscnnel and communicate the recommended off-site actions to the Ottawa County Shariff's Department (or the State and County Emergency Operations Centers if they have been activated).
4.2 in order to simplify evacuation instructions for the public, evacuation " subareas" (see Figure 1) have been
[
established by municipal and geographical boundaries.
When making evacuation decisions in an emergency situa-i tion, the EDO shall consider the time available (based on l
plume t.avel speed) to evacuate the affected subarea (s),
in comparison to the estimated evacuation times as given in Table 1.
The data sheets used in Section 6. assist in i
i this process.
5.
PROTECTIVE ACTION GUIDELINES l
7 5.1 Recommended Protective Actions for the Plume Exposure 4
Pathway (10 mile) Emergency Planning Zone to avoid whole body and thyroid dose from exposure to a gaseous plume:
Projected Dose (Rem) to the Population Recommended Actions (#)
Comments
}-
[ g Whole body
<1 Noplann(g) protective Previously i
actions Issue an reccmmended Thyroid
<5 advisory to seek protective shelter and await actions may further instructions, be recon-Monitor envi ronmental.
sidered or I
i radiation levels.
terminated.
Whole body 1 to
<5 Seek shelter as a min-If con-i imum.
Consider evacu-straints l
ation.
Evacuate unless exists, Thyroid 5 to
<25 constraints make it special i
impractical.
Monitor cons ide ra-environmental radia-should be tion levels.
Control given for access.
evacuation 1
of children and preg-nant women.
Whole body 5 and above Conduct mandatory Seeking evacuation.
?!on i t o r sheIter environmental, radia-would be an Thyroid 25 and above tion levels and adjust alternative area for mandatory if evacua-evacuation based on tion were these levels, not immedi-js s
l
(
)
Control access.
ately pos-1 s_ /
sible.
I s
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4 AD 1827.12.7 (a)
These actions are recommended for planning purposes.
Protective action decisions at the time of the incident must take existing conditions into Con-sideration.
(b)
At the time of the incident, officials may implement low-impact protection actions in keeping with the principle of maintaining radiation exposures as low as reasonably achievable.
5.2 Guidelines for protection against ingestion of contamina-7 tion for the Ingertion Exposure Pathway (50 mile) Emergency Planning Zone:
I.
Ground Contamination A.
Action Levels
- 1. Projected whole body dose above the ground 2 rem
- 2. Ground Contamination levels h2000 pCi/m2 at t= 1 he post-accident
- 3. Exposure rate 212 mR/llr at 1 meter above ground at t=
1 hr post-accident B.
Recommended Protective Actions
- 1. Evacuation of affected areas
- 2. Restriction of entry to contaminated off-site areas until radiation level has decreased to State approved levels II.
Food and Water Contamination A.
Action Levels Concentration in Milk or Water (0.5 '
or bone:
Total Intake 1.5 rem 15 rem via all Pasture
_ thyroid)
_ thyroid) l'ood & Water Grass Preventive Emergency Pathways (Fresh Weight _)__
- l. ve l f.e ve l Prevent ive l'mergency Preventive Emergency l
hoy,1 i de -
(pCi/l)
(pCi/l)
(pCi)
(pCi)
(pCi/kg)
(mci /kg) i 1-131 (thyroid) 0.012 0.12 0.09 0.9 0.27 2.7 If other nuclides are present, Reg. Guide 1.109 will be used to
5 AD 1827.12.7 calculate the dose to the critical organ (s).
Infants are the 9
critical segment of the population Concentration in Milk or Water (0.5 (5
or bone:
Total Intake 1.5 rem 15 rem via all Pasture thyroid) thyroid)
Food & Water Grass Preventive Emergency Pathways (Fresh Weight) 1.e ve l Level Preventive Emergency Preventive Emergency Nuc lide'i
( Ci/1)
(pCi/1)
(pCi)
( Ci)
(pCi/kg)
(pCi/kg)
Cs-137 (Whole flody) 0.34 3.4 7.0 70 3.5 35 Sr-90 (bone) 0.007 0.08 0.2 2.0 0.7 7.0 Sr-89 (bone) 0.13 1.3 2.6 26 13 130 B.
Recommended Protective Actions Preventive Emergency 9
- 1. Removal of lactating Isolate food and water dairy cows from con-from its introduction Laminated pasture and into commerce after substitution of uncon-considering:
taminated stored feed.
- 2. Substitute source of
- a. availability of uncontaminated water.
other possible
- 3. Withhold contaminated actions; milk from market to
- b. importance of par-allow radioactive decay.
Licular food in
- 4. Divert fluid milk to nutrition; production of dry whole c.
time and effort to milk, butter, etc.
take action;
- d. availability of other foods.
7 5.3 Representative shielding factors f rom airborne radio-nuclides:
Shielding [,) Reps ventative Range Structure or 1.ocation Factor Outside 1.0 Vehicles 1.0 9
l Wood-frame house 0.9 l
(no basement) i
i
)
o AD 1827.12.7 i
Shielding (3) Representative Range Structure or Location Factor Basement of wood house 0.6 J.1 to 0.7(C) i l
Masonry House (no base-0.6 0.4 to 0.7(c) ment)
Basement of masonry house 0.4 0.1 to 0.5(c) t Large office oc indus-0.2 0.1 to 0.3(c' d) l trial building (a)
The radio of the dose received inside the structure to the dose that would be received outside the structure.
l (b) i A wood frame house with brick or stone vencer is approximately equivalent to a masonry house for shield-ing purposes.
(c)
This range is mainly due to different wall materials and different geometries.
(
The shielding factor depends on where the personnel are located within the building (e.g., the basement or an inside room).
e 7
5.4 Representative shielding factors for surface deposited i
radionuclides:
Representative
) Representative Structure or Location Shielding Factor Range 1 m above an infinite 1.00 sm<n th sur face 1 m above ordinary ground 0.70 0.47-0.85 1 m above center of 50-ft 0.55 0.4-0.6 roadways, 50% decontam-inated C. : : u n 'iO - 1 L road:
!<u.nl t ul ly contamina ted 0.5 0.4-0.7 Ito.nl 50*; decon ta,aina ted 0.5 0.4-0.6 Road fully decontaminated 0.25 0.2-0.5 Trains 0.40 0.3-0.5
=.
7 AD 1827.12.7
.p Representativeg) Representative Structure or Location Shielding Factor Range One and two-story wood-0.4(b) 0.2-0.5 l
frame house (no basement)
One and two-story block 0.2(b) 0.04-0.40 l
and brick house (no base-ment)
House basement, one or two 0.1(b) 0.03-0.15
{
walls fully exposed:
One story, less than 2 0.05(b) 0.03-0.7 ft of basement, walls exposed Two stories, less than 2 0.03(b) 0.02-0.05 ft of basement, walls exposed 1
Three-or four-story structures, 5000 to 2
10,000 ft per floor:
g)
^
First and second floors: 0.05(b) 0.01-0.08 Ilasement 0.01 0.001-0.07 Millistory structures, 2
>10,000 ft per floor:
^
Upper floors 0.01(b) 0.001-0.b2
)
Basement 0.005 0.001-0.015 4
(a)
The ratio of dose received inside the structure to the dose 'th't would be received outside the structure.
a
()
Away from doors and windows.
7 5.5 Distribution of Potassium Iodide Tablets i
1.
The EDO will direct Station personnel to take a KI l
tablet if, (a}5the known iodine concentration will exceed 1 x 10 pCi/cc for greater than one hour, or-i (b) the total known dose to an adult thyroid will
}
exceed 10 rems, r
- F 2.
Base the distribution of KI on actual thyroid doses',
not projected doses.
K1 is 90% ef fective i f admin-intered within one hour a f ter the uptake, and 50%
i ef fective if administered within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> af ter uptake.
J l
3.
Call Radiation Management Corporation if KI is
,O administered for further directions regarding usage.
r lL r
V
. ~ -..
8 AD 1827.12.7 6.
PROCEDURE 6.1 Whole Body Dose i
Complete Data Sheet 1.
t 7
6.2 Thyroid Dose
,i Complete Data Sheet 2.
6.3 '
Protective actions should be recommended as developed by Data Sheet I and 2.
Additional guidance is as follows:
EXAf!PLES OF ACTIONS ACCIDENT PHASE EXPOSURE PATH %'AYS TO BE RECOM>LENI)ED Inhalation of Evacuation, shelter, EMERGENCY gases, radio-access control, res-PHASE 1 iodine, or par-piratory protection, (0.5 to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />)f-ticulate prophylaxis (thyroid protection)
Direct whole body Evacuation, shelter, exposure access control Ingestion of Take cows off pas-milk ture, prevent cows from drinking sur-face water, discard contaminated milk, or divert to stored products such as cheese INTERMEDIATE Ingestion of Wash all produce, or Pl!ASE2 fruits and impound produce, vegetables delay harvest until approved, substitute
{
uncontaminated pro-duce Ingestion of Cut off contaminated water supplies, substitute f rom other sources,
filter, demineralize (24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to Whole body expo-Relocation, decon-30 days)i-sure and inhala-tamination, fixing tion of contamination, deep _ plowing,,,_
1 Emergency phase - Time period of major release and subsequent plume ex)osure.
2 Intermediate phase - Time period of moderate con-tinuous release with plume exposure and contamination of environment.
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Inges-ion of food Decontamination, and water con-condemnation, or taminated from destruction of food; LONG TIRM the soil either deep plowing, coc-l
?HASI3 by resuspension demnation, or al-i or uptake ternate use of land through roots Whole body expo-Relocation, access sure from deposi-control, decontam-l (over 30 days)*
tion material or ination, fixing of inhalation of re-contamination, deep j
suspended plcwing material i
3 Long Term Phase - Recover / period.
l
" Typical" ?ost-accident time periods.
6.4 Small Children and Pregnant Women t
i I
Anv time the projected whole body does is expe::cd to i
i execed 500 mrem or the p roj ect.c.! thy roid close is expec tect i
I to exceed 1.5 rem, advise the Ottawa County Sheriff's I
Department to conduct an evacuation in the area of exposure j
of families in which there are pregnant w: men or small l
children.
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n3,p,,x.-a.a. n '. s - *. r =.. o 3.
0 u' '. a. ;.. n.
o.#
.' n. a..- a. s u (1, 2, 5, or 10 miles) miles NOTE:
Use the distance in which the proJ ected exposure levels i
calculated in AD 1327.10 are above the Protective Action Guidelines given in Section 5.1.
A data sheet should be a,..,, a.,d :o e s s a a. c,c.,u
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e.
c.
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3 ca.cu. ate,.nc,.c
_ody
,o s e,.sa t e :
L (D=?!?./HR f rom Step la, Data Sheet 1 of AD 1327 10, Emergency Off-site Dose Rate Estima e)=
mR/HR 4.
Release Curation (If not -:nown assume 10 hrs.)
hours 5.
troj ected dose = dose rate x duration = ~: ems 3 x 4 =
REM 1000 1000 6.
Wind Speed
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Distance (i:em 2) 1, i u m e.. rave.. I..t m e =
,W i n e, a p e e t,
- ttem 0;
.s
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G Use information frca Items 1 and
'.0 to get Estimated s
Evacuation Time from Table 1.
hours i
12.
Exposure Time:
Item 11 - Item 9 =
hours l
{
SOTE:
If Item 9 is negative, keep in mind that minus a negative l
j number gives a positive result.
If Item 9 is larger than i,
Item 11, enter zero hours.
]
13.
Evacuation Exposure Period (EEP):
Take the smaller of Exposure Time (Item 12) or
~
1
)
Release Duration (Item 4) hours 1
j 10.
Evacuation Dose = EEP hours x Dose Rate = (Item 13) x (Item 3) =
l REM 1000 1000
.l I
4 l
13.
Sheltering Cose -
Projected Cose x Structure Shielding Factor (from j
3.3) --
"m.".
1
)
{
..oTE :
Since the housing in the 10 mile Emergency ?'anning Zone i
j is basically wood homes, a structure shielding factor of
{
j 0.'9 should normally be used.
i.
16.
' sing tr.e above information and following table, l
u j
determine the protective actions to be re:cm. mended:
l 1
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i j
Projected Dose (Item 5) less than a.
NC ACTION l
a.
I rem j
b.
Sheltering Cose (Item 16) is greater t.
SHELTER than I rem but less than 5 rem i
c.
Sheltering Ocse greate r than 5 c.
EVACUATE lI rem, and Evacuatton Cose (Item 15s ess tnan dhettering vose I
1 I
i d.
She t'.cring Dos e grea ter tn.an o rem d.
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l 13 AD 1327.12.6 l
TABLE 1 I
Evacuation Time Estimates j
Land Sub-Areas Population
- Normal Adverse Severe **
i 1
2,775 2 hr. 55 min.
823 4 hr. 10 min.
[
823 15-20 hr.
2
.2,675 3 hr. 5 min.
}
}
861 4 hr. 50 min.
i 361 30-40 hr.
I 4
6 3
10,717 3 hr. 35 min.
~
l 3,242 6 hr. 30 min.
t 3,242 35-45 hr.
l l
4 608 2 hr. 50 min.
608 4 hr. 15 min.
l 608 10-15 br.
t 5
4,940 3 hr. 30 min.
4,940 4 hr. 30 min.
4,940 40-45 h-I I
h p 6 4,940 3 hr. 30 min.
A 1,506 5 hr. 10 min.
1,506 30-40 hr.
l 4
l 7
1,365 4 hr.
1,795 6 hr. 25 min.
I 1,795 50-60 hr.
l P
TOTAL EPZ 28,484 5 hr. 15 min.
I 13,775 10 hr. 55 min.
13,775 75-100 hr.
6i Lake Sub-Areas Boaters Normal Adverse Severe 3 thru 13 Varies 4 hr.
N/A N/A Special Case,
Poculation Normal Adverse Severe Port Clinton 10,12S 4 hr. 45 min.
/,e29 6 hr.
7,229 24-30 hr.
APopulation varies due to location and transient resident variations due to season and unf avorable weather conditions.
"ime ranges are provided due to the uncertain nature of severe weather i
onditions (e.g., during a severe snow fall or bli::ard, the time it takes l
Lv evacuate can vary depending on the direction and speed of the wind).
I i
-, ~.
f 14 AD 1327.12.7 l
un A cu._rr1
?-
m i
l Evacuation vs Shelter Decision Guide For Thyroid Dose 1.
Evacuation subarea frem Figure 1 i
l 2.
Complete Data Sheet 1 l
3.
Release Duration from Data Sheet 1, Item 4 (If not known assume 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />) hours l
l l
4.
Evacuation Exposure Period (EEP) from Data Sheet 1, Item 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> 7
5.
Calculated Thyroid Dose Rate (Step 12, Data mR/HR Adult Sheet 2, AD 1327.10) mR/RR Child 6.
Projected Thyroid Dose = Item 3 x Item 5 =
Decision Dose is that value of Projected Thyroid Dose above which evacuation is beneficial.
The Dec i s i on Do:a- <lepends on the HeIcase Duraticn as tollow h
Release Duration Decision Dose (hours)
(rem) 2 75 3
45 4
38 5
34 6
32 8
30 12 23 24 27 above 24 25 Decision Dose =
REM d.
Using the abcve information and following L.i bl e, le t e na i nc the protective actions to be recommended:
11' THE:4 I
Pru;ected Thyraid Dose (' tem 6) less a.
.,0 ACTiU:.
i than 5 rem O
I 15 AD 1827.12.7 I
-DATA SHEET 2 (Continued) i E
THEN l
7 b.
Projected Thyroid Dose greater than b.
EVACUATE 5 rem but less than 25 rem CHILDREN AND WOMEN OF CHILD-BEARING AGE IF POSSIBLE, SHELTER
- OTHERS-i c.
Projected Thyroid Dose greater than c.
EVACUATE IF 25 rem, but less than the POSSIBLE OR l7 Decision Dose (Item 7)
OTHERWISE j
SKELTER
- 1 i
j d.
Projected Thyroid Dose greater than d.
Perform action l
Decision Dose, then as follows:
i
.l 1.
If EEP less than Release 1.
EVACUATE I
Duration 2.
If EEP equal to Release 2.
SIIELTER*
i Du ra Lion
- SHELTER is to be with VENTILATION CONTROLLED.
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l I
i l
l-Ir-END
_ _ _ _ - _,