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Forwards Calculations & Results in Support of 5 Mile Radius for Alerting & Providing Prompt Instruction to Public within Plume Exposure Pathway Emergency Planning Zone.Info Suppls 810724 Response to 810701 Request
	ML18046A962
Person / Time
Site:	Palisades
Issue date:	09/21/1981
From:	Johnston B; CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
	NUDOCS 8110200171
	Download: ML18046A962 (6)
	v • d • e

,

.consumers Power

.company General Offices:

2*12 West Michigan Avenue, Jackson, MI 49201 * (617) 7138-0650 September 21, 1981 Mr James G Keppler Office of Inspection Region III and Enforcement US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET. 50-255 - LICENSE DPR PALISADES PLANT - EPZ ALERTING AND PROMPT INSTRUCTION SYSTEM SUPPLEMENTAL iNFORMATION

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NRC letter dated July 1, 1981 requested Consumers Power Company to pro~fd;;~*py7..' ~

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July 24, 1981, confirmation that the ~uly 1, 1981 implementing date. of the syift-em for providing prompt notification to the public within_ the plume exposure path-'

Wa.y Emergency Planning Zone (EPZ) in the event of an emergency, has been met plus a description of that system.

You were provided that information by our *1etter of July 24, 1981 and you were also provided.with the *statement and the supportive reasons why the alerting and prompt instruction zone is within a 5 mile radius of the Palisades Plant.

This submittal prpvides the actual.calculations arid results, as Attachment I, in support of the 5 mile radius for alerting and prompt instruction.

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Brian D Johnson Senior Licensing Engineer CC Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforc~ment NRC Residen*t Inspector - Palisades

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PALISADES PLANT EPZ ALERTING AND PROMPT INSTRUCTION SYSTEM CALCULATIONS BASED ON ACTUAL X/Q VALUES Attachment I Whole body doses to the public as a result of a Class 9 accident were calculated based on actual Palisades X/Q values (see printout attached).

The method used was that of RWS 175-79, "Primary Emergency Planning Zone Radius for Big Rock Point NU.Clear Plant" (December 13, 1979), JLB 81-14, "Palisades Plant - Class 9 Accident Dose Calculation at 5 and 8 Miles, 11 and AA 81-08, "Midland EPZ Calculation Based on Actual X/Q Values.

11 The method is outlined below.

The 24-hour inte rated whole bod dose at a radius of 5 miles was found to be less than 110 rems for 5 ~ meteorology at the most probable wind speed of 5 m/ s.

Thus, the Emergency Planning Zone (EPZ) for Palisades is within a 5-mile radius (at least with regard to the need for immediate notification).

Method The whole body penetrating radiation dose rate due to immersion in a semi-infinite radioactive cloud may be written as (Reg Guide 1. 4):

D. =

y

l.

E. =

~ l.

x.' =

l.

0.25 E.X.

yl. 'l.

Gamma dose rate from a semi-infinite cloud in rad/sec delivered by nuclide i Average gamma energy per disintegration of nuclide i

(MEV/dis) (see Table I attached)

Concentration of nuclide i in the cloud (Ci/m3)

The concentrations and release rates may be written as:

Where:

x. l.

X/Q

= (X/Q) Q.e

l.

-LT

l. ' Q. = Q. e

l.

01.

-".t

l.

3

= Meteorological dispersion factor (sec/m ) obtained from two years of data collected on site.

These plant-specific X/Q values are smaller than general X/Q values (at 1 m/s) listed in Reg Guide 1.4 because the actual wind speeds are used to calculate them.

The 5th percentile values corresponding roughly to sta.bili ty Category F are used.

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Qi = Release rate from containment for nuclide i (Ci/ sec) li = Decay constant for nuclide i (sec -l) (see Table I)

T =Transit time.from containment to 5 miles (1610 sec for 5 m/s wind speed which is the most probable wind speed found by ratioing the actual x/Q values to the ones in Reg Guide 1.4 which are for 1 m/s wind speeds)

Q

= Containment r.. elease rate for nuclide i. at t=O (shutdown) oi (see Table I) t = Time post~accident (sec) (from 0 to 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months ).

Thus, the dose rate equation becomes:

).t

).T yDi = ~-25 Eyi x/Q ~i e-i e-i The release is assumed to be uniform and to be taking* place over a 24-hour period. Folloving the suggested method in Reg Guide l. 4,.different x /Q values for 0-8 hours and 8-24 hours are used.

Thus, the total integrated dose for nuclide i becomes:

24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months

- rs hrs f 24 hrs.

.. yl>i ~t J yDi dt +

yDi dt

. 0 O

8 hrs 1 T [ *

28800 sec

= 0.25 Ert~ie-i

~ 8 hr J e-l1t dt 0

+

= 0.25 °Eyi lloi e -A1T[ a8 hr. :i (

l-~-28800Ai)

+ ~

6 hr f;: (

0-28800A1_0 -8640PA1 >]

Where T = 1610 sec is the 5-mile transit time for 5 m/s wind, and x/Q8 hr = 1. 2 E-5 sec/m3, x/Q16 hr = l. 2 E-6 sec/m3 (from the.attached printout).

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For the halogens, no transit time decay is assumed (T=O) and the core spray is assumed to reduce the halogen inventory available for release from 25%

originally to 1% at t=2 hr (Reg Guide 1.4).* Thus, the integrated dose for halogen i becomes:

24 J 0

yDidt

0.25 En <io1

+X QS hrs l~ 8 hrs 1

(1 -7200).i)

>.i

-e 3

Dose contribution due to each nuclide is given in Table. I.

Doses below 1 mrem are not shown.

The total integrated whole body dose due to all nuclides is then found by summing the contributions from each nuclide:

24 hrs Total dose = ~ ~ yDi dt Using the above method, total dose is found.to be z 110 rems at 5 miles for stability Class F at 5 m/s (corresponding to 5th percentile Palisades plant-specific x/Qs.

A bou."lding case calc.ulation in which no credit is taken for noble gas* decay in transit (T=O) will give <127 rems of whole body dose.

This letter calculi;Ltion avoids any assumptions regarding probable wind speeds.

I

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Isotope

).(Sec-1 )

Kr-83m l.03E-4 Kr-85m

4. 38E-5 Kr-85 2.03E-9 Kr-87

1. 52E-4 Kr-88 6.90E-5 Kr-89 3.63E-3 Kr-90 2.15E-2 Kr-91 8.07E-2 Kr-92 3-77E-l Kr-93

5. 37E-,l Kr-94 6.93E-l Xe-13lm 6.72~7 Xe-133m 3-55E-6 Xe-133

l. 52E-6 Xe-135m 7-37E-4 Xe-135 2.lOE-5 Xe-137

3. 02E-3 Xe-138 8.13E-4 Xe-140 5.lOE-2 Xe-141

4. 03E:..l.

Xe-143 7~22E-l Rb-88 6.90E-5 Cs-138 3.58E-4 I-131 9.82E-7 I-132 8.52E-5 I-133

. 9.48E-6 I-134 2.22E-4 I-135 3.05E-5 Br-84 3.63E-4

( 1 )

From MEDLIST.

TABLE I Palisades Plant - Core Inventory at t=O, Nuclide Data, and Doses Core Activity Initial Release Dose (Rem)

E(MeV) (1)

(Ci at t=0)(2)

Rate G-0 (Ci/ sec) ( 3) at 5 Miles 2.58E-3 7.94E+6 9.19E+l 5.58E-3

l. 57E-l

1. 72E+7 l.99E+2

1. 48E+O 2.21E-3 7-95E+5 9.20E+O 2.llE-3 7.16E-l 3.06E+7 3.54E+2 3.85E+O

. l.81E+O 4.48E+7 5.19E+2 3.20E+l l.02E+O 5.28E+7 6.11E+2

1. 49E-3 l.12E+O 5.41E+7 6.26E+2 7-31E-l 3.48E+7

4. 03E+2*

6.95E-l

1. 75E+7 2.03E+2 l.39E+O 4.32E+6 5.00E+l 3.04E+6 3.52E+l 3.27E-3 4.66E+5

5. 39E+O*

1. 80E-3 2.40E-2 5.18E+6

. 6. OOE+l

1. 38E-l 3.02E-2

1. 50E+8

1. 74E+3 5.26E+O 4.28E-l

4. 50E+7 5.21E+2 2.77E-l 2.45E-l 2.59E+7 3.00E+2 5.00E+O

1. 37E-l

l.25E+8 l.45E+3

1. 53E-3 9.87E-1 1.17E+8

1. 35E+3

1. 33E+O

9. 44E-l 5.13E+7 5,94E+2 4.39E-l

1. 56E+7 l.81E+2 5.15E+5 5.96E+O 5.85E-l

4. 48E+7( 4) 5.19E+2 1.04E+l 2.24E+O 5.85E+7(5) 6.77E+2 7.14E+O Subtotal ::: 6T rem

3. 75E-l.

l.95E+7 2.26E+2 2.lOE+O 2.22E+O

2. 76E+7 3.19E+2 l.19E+l 5-77E-l 3.19E+7 3.69E+2 5.00E+O 2.46E+O 4.12E+7 4.77E+2 1.28E+l l.42E+O 3.26E+7 3-77E+2 l.13E+l l.63E+O 3.10E+6 3-5.9E+l 4.50E-l Subtotal :: 4 3 rem TOTAL -:::110 rem (2)

From NED0_.24782 based on Palisades data of 2650 MW+, 100% noble gases, 25%

halogens at. t<2 hr and 1% halogens at t>2 hr as a result of containment spray removal.

( 3)

Core inventory divided by 86400 sec ( 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months ).

( 4)

In equili briutn with Kr-88 after 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , starting with pure parent.

(5)

Reaches max activity in 0.5 hour5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months from pure parent of Xe-138 (max activity approx 0.5 initial parent activity).

......-?

PALISADES PLANT METEOROLOGY DATA December 1978-November 1980 Distance from plant = 5 miles T for 60 m - 10 m height difference Winds measured at a height of 10 m above ground 1 HOUR INTERVAL FINISHED 16802 WORDS 1 HOURS AVERAGE:

WORST CASE:

ONE PERCENTILE:

FIVE PERCENTILE:

FIFTY PERCENTILE:

ARITHMETIC MEAN:

16802 VALUES 0.2245E-03 0.3917E-04 0.2574E-04 0.1779E-05

0. 5083E-05 2 HOUR INTERVAL FINISHED. 16801 WORDS 2 HOURS AVERAGE:

WORST CASE:

ONE PERCENTILE:.

FIVE PERCENTILE:

FIFTY PERCENTILE:

ARITHMETIC MEAN:

16801 VALUES 0.1358E-03 0.3107E-04 0.1959E-04 0.1520E-05 0.4040E-05 8 HOUR. INTERVAL FINISHED 16795 WORDS 8 HOURS AVERAGE:

16795 VALUES WORST CASE:

0.5060E-04 ONE PERCENTILE:

0.1930E-04 FIVE PERCENTILE:

0.1186E-04 FIFTY PERCENTILE:

0.1300E-05 ARITHMETIC MEAN:

0.2881E-05 16 HOUR INTERVAL FINISHED 16787 WORDS 16 HOURS AVERAGE:

16787 VALUES WORST CASE.:

0. 48 30E-05 ONE PERCENTILE:

0.1736E-05 FIVE PERCENTILE:

0.1191E-05 FIFTY PERCENTILE:

0.3442E-06 ARITHMETIC MEAN:

0.4828E-06

ML18046A962

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