ML20090H076
| ML20090H076 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/12/1984 |
| From: | Bray L SOUTHERN CALIFORNIA EDISON CO. |
| To: | Fish R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML20090H044 | List: |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737 NUDOCS 8407260100 | |
| Download: ML20090H076 (9) | |
Text
'
Attukmot B
Sou/hern Ca/iforn/a Ed/ son Company S AN ONOFRC NUC LE AR GENER A TING ST A TSON P.O. Boa 12, S AN C LEMENT E C A LIF ORNI A 92672 April 12, 1984 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5358 Attention:
Ray Fish, Team Leader Emergency Preparedness Facility Appraisal' Subjec;:
Docket No. 50-206/361/362!
Dose Assessments for Scenarios Nos. 2, 5, 19 and 20 from NUREG/CR 3012, Volume 3 i
San Onofre Nuclear Generating Station, 1, 2 and.3 i
I Per ycur request at the exit interview for the Emergency Preparedness Facility Appraisal, I have completed dose assessments using the EARS program for scenarios numbers 2, 5, 19 and 20 from NUREG/CR 3012, Volume 3.
Copies of computer printouts of these assessments are attached for your review.
j The results of these dose assessments were compared to the results obtained from the IRADAM model utilized in the NUREG, and the following points were noted:
X 1)
EARS currently uses a recirculation factor in the calculation of /q.
The value of this factor varies from about 4 at the site boundary to 1.1 X/q at 10 miles.
As a result of the recirculation effect, the value X
calculated by EARS is slightly higher than the /q calculated by IRDAM.
l 2)
EARMAN utilizes a mixing depth (inversion layer) value which acts as an upper boundary for reflection of a plume.
This value is a variable and is entered by the user during meterological input. The current default for the mixing depth is 101 meters, as suggested by the Cor-porate Meterologist.
I performed two runs of each scenario utilizing l
mixing depths of 101 meters and 1000 meters to demonstrate the effect X
of different mixing depths on the calculeted /q values. When the mixing depth is low, the oz value quickly approaches the mixing height
[
but cannot expand beyond this layer..,As a result, the vertical
~
dispersion is reduced and the concentrati~oh downwind is increased.
i;i ili.d C?. w i?
B407260100 840709 l
PDR ADOCK 0500036i e, ::.;*n a l
0 PDR L
MR. RAY FISH April 12, 1984 3)
The dose rates at a distance downwind calculated by IRDAM are performed at slightly different locations than those calculated by EARS.
For instance, EARS calculates the EAB dose rate at a distance of 580 meters, while IRDAM's first comparable talculation distance is for 500 meters.
4)
Scenarios 19 and 20 were calculated by IRDAM as elevated releases; however, EARS calculates all releases at ground level.
As a result of this X/q values calculated by EARS are difference in release height, the higher than those calculated by IRDAM for these two scenarios.
When all the differences noted in points 1 through 4 have been addressed, the values calculated by EARS agree to within a factor of 2 or better with the values calculated by IRDAM.
This comparison has been tabulated in Attachment 1 for scenarios 2 and 5.
Comparisons between EARS (with L equal to 1000) and IRDAM can be made directly at distances of 2 and 5 miles, and indirectly from the hand calculation at any other distance.
Similar extensive comparisons with EARS printouts and hand calculations have been done to verify that the computer calculations are performed correctly, however, these are contained in various memos and log books. We are currently assimilating these documents and the validations on meterological and RMS inputs performed by the Computer Group into one record.
If you have any further questions regarding these or any other dose assessments provided, please contact me at (714) 492-7700, ext.59-108.
Sincerely, LINDA BRAY Health Physics Engineer Enclosures cc: E. Branigan (USNRC Headquarters)
L
ATTACIDfENT 1 Table of Dose Rate (mr/hr) Calculations j
f l
liand Calculation
- Scenario 2
With Recire Factor Without Recire Factor Distance EARS (L=101m)
EARS (L=1000m)
L = 101 L = 1000 L = 101 L = 1000 IRDAM 0.3 mi.
19 19 4.8 4.8 4.97 r
)
0.36 mi.
7 9
16 16 4
4 1
1 2.6
.8 2
1.65 0.7 0.5 4
1.2 1.52 1.25 0.5 0.38 0.189 i
2 0.9
.09 0.7 0.13 0.35 0.07 0.06 5
0.3
.03 0.13 0.01~
0.13
-0.01 0.01 10 0.1
.01 0.07 0.01 0.07 0.01 12.4 0.05 0.007 0.05 0.007 0.005 f
O.3 5
5.6E4 5.6E4 1.4E4 1.4E4 1.6E4 i
0.36 SE4 8E4 4.7E4 4.7E4 1.2E4 1.2E4 i
1 1 lE4 3.6E3 5E3 4.7E3 1.7E3 1.6E3 1.2 1.3E3 1.2E3 6.18E2 4
2 3.5E3 3.6E2 2E3 4E2 1E3 2E2 1.97E2 1
5 9.8E2 1.E2 4E2 4E1 4E2 4E1 3.6El i
10 4.6E2 4.7El 2E2 2E1 2E2 2E1 i
f 12.4 1.4E2 1.4E1 1.4E2 1.4E1 1.6El i
- Example lland Calculations are included in Attachment 2.
(
- : h ' '..
i. t,
- s. d.' V ' ~
l
.,.,. a e
ATTACINENT 2 Hand Calculations of Dose Assessments
~~
for Scenarios 2, 5, 19 and 20 of NUREG/CR 3012 1.
Scenario #2 Input:
Windspeed u = 4.5 mps Stability Class = B Gross release rate = 1 Ci/see total Noble gas Initial ef fective age = 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Duration of release = 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> Based on Stability Class B Distance Downwind EAB 1 mile 2 miles 5 miles 10 miles z
60 220 800 8,600 44,000
- y 90 200 400 900 1,700 With Mixing Height L z
Q
[1 + 2 exp (-2 (
))]
for 6
> 2L Xj g
2n6 Lu y
where K - recirculation factor :
K = 4 if d < 1200 C.
K = 1 if d 51500, otherwise d.
,[
K = -2.59814(log d)3 + 31.70108 log dr 10 10 l,.
129.38097 log d + 177.6703 D (whole body dose rate) = X/q x Q x DCF x 1.14 E2 x CR 8
where DCF
= dose conversion factor mrem - m = 2.94 E2 for Xe-133 yr pCi 3
1.14 E2
= conversion to mrem m hr C1 CR
= correction factor for gas age s 10 A) Case 1 L = 101m Xj
_[1 +.01] = 5 E-5 at EAB :
=
Q EAB n(60)(90)(4.5)
ATTACIDIENT 2 Page 2.
at 1 mile 6 > 2L.
K=3 X/ z 3
9
= 5.3 E-6 2n(200)(101)4.5 at 2 miles K=2 X/
2
= 2 E-6
=
9 2n(400)(101)4.5 at 5 miles K=1 X/
1
= 4 E-7
=
9 2n(900)(101)4.5 at 10 miles K=1 X/
=*
1 9
2n(1,700)(101)4.5
~
~ ( ! }EAB
- (*
D E*
EAB Q
sec a 16 mrem /hr Dg,ty,, (Xj )1 mile q
x 3.35ES : 2 mrem /hr D2 miles = (Xj )2 miles q
x 3.35E5 s 0.7 mrem /hr 5 miles = (Xj )5 miles q
x 3.35ES a 0.13 mrem /hr 10 miles - (X/q)10 miles x 3.35ES a 0.07 mrem /hr l
I
ATTAClDIENT 2 Page 3 B) Case 2 L = 1000m (Comparable to IRDAM treatment of mixing depth, includes var {ablerecirculationfactor) 7 4
[1 + 2 I exp
( -2 (nL)2)
( /q) = n(60)(90)(4.5) at EAB :
n=1 6,
a 4
[1 + a0) w(60)(90)(4.5)
=
5 E-5 at 1 mile (X/)=
3
[1 + s0]
n(220)(200)4.5 5 E-6
=
at 2 miles (X/q) n(800)(400)4.5 2
[1 + 20]
4 E-7
=
at 5 miles (Xj ).
1 9
2n(900)(1000)4.5 4 E-8
=
10 miles (Xj ),
1 at q
2n(1700)(1000)4.5
- 2 E-8
- .D
~
EAB D1 mile = 4 E-6 x 3.35E5 = 1.65 D2 miles = 0.13 D5 miles = 0.01 "10 miles = 0.01 1
ATTACHMENT 2 Page 4 II.
Scenario #5 X
Same meterological inputs as Scenario #2, therefore, same / values.
Gross release rate = 1 Ci/sec Iodine Thy - (X/ ) x Q x THYDCE x 3.6 E6 x CR 3
where THYDCF = dose conversion factor for I-131 a 5.15 E2 rem m see Ci 3.6 E6 = converts rem /see to mrem /hr CR = correction for gas mix age s 0.5 A) Case 1 :
L = 10lm
. at BD THY = (X/q) x 1 x 5.15 E2 x 3.6 E6 x 0.5 = Xj x 9.3 E8' q
= 5 E-5 sec x 9.3 E8 m'
s 4.7 E4 mrem /hr at 1 mile D
= 5.3 E-6 x 9.3 E8 a 5 E3 tarem/hr THY at 2 miles D
= 2 E-6 x 9.3 E8 a 2 E3 mrem /hr THY at 5 miles D
= 4 E-7 x 9.3 E8 a 4 E2 mrem /hr THY at 10 miles D
= 2 E-7 x 9.3 E8 r 2 E2 mrem /hr THY B) Case 2 :
L = 1000m at EAB D
= 5 E-5 x 9.3 E8 a 4.7 E4 mrem /hr THY at 1 mile D
= 5 E-6 x 9.3 E8 2 4.7 E3 THY at 2 miles D
= 4 E-7 x 9.3 E8 : 4 E2 THY at 5 miles D
= 4 E-8 x 9.3 E8 m 4 El THY at 10 miles D
= 2 E-8 x 9.3 E8 a 2 El THY
"a S. C.
MGM.
I Massage:
RADIOLOGICRL RCTION LEVEL 8 04/03/29 1980 :
Alert CLASS A MODEL EMERGENCY CLASS CRITERICH CURRENT ESTIMRTE SEC-UNUSUAL SITE GENERAL DOSE TYPE 9 ER3 TOR EVENT RLERT EMERGENCY EMERGENCY TECH SPEC.
1.7E+00 A
.057e
.570e WHOLE BODY mrem /hr mrem /h'r mrem /hr (H. GASES ONLY)
(R1-1)
(R2-1)
I TECH SPEC.
4.0E+00 R
.340+
3.400+
SKIH mrem /hr meem/hr mrem /hr (R1-1)
(R2-1)
TECH SPEC.
8.5E-03 A
.170 1.700 THYROID arem/hr mrem /hr mrem /hr (R1-1)
(R2-1)
EPR P.R.G.
3.0E+00 R
500 WHOLE BODY mrem meen (R3-0)
.EPR P.R.G.
1.7E-02 R
5000 4
THYROID arem nrem (A3-8)
HUREG 0654 1.5E+00 A
50 500 WHOLE BODY mrem /hr meem/hr mrem /hr (RLL ISOTOPES)
(R3-3)
(R4-1)
HUREG 0654 8.5E-03 A
250 5000 THYROID mrem /hr mrem /hr mrem /hr (A3-4)
(R4-2)
Ident ifies Any value Which Exceeds the Radiological Resion Level 4
e NOTE:
The Rbove Calculations are based on a CHI /Q of 5.0E-05 Calculated from the Most Recently Entered MET Data.
l NOTE:
State of California Regulations Require the Site and General Emergency Values to be 500 mrem (meem/hr) rather than itse meem Cerem/hr) as recommended for Whole Body Exposure by HUREG 0654 and EPR P.R.G.
1 l
m Attac..wt D
- t I
s j
A
. l..... [.......l l
q
....i.......
,/
- +
.f
- S..P.W.@..15.....
t
.J
...,g 9.
- g /
.:CS.A;T(R.. R..N. O::: p 5..
g
'(Eu&.....
l l},
g
,~
' .,,..[x
- Q.;E.nENTE i,'
l 4.,
'~
n
,... *:.../.,,......,,.
3,
, )
e
...or
~. x
"' "'r.,a\\*,. 9...,
,sm l
l..
f
! CRMP PENDiETON i
I, i
c
,v.
g.....
y.
s
,... ~.... -
,, ~.
h i
,,"J..J,.,',.,.,>.,.. h' ri.i.,
- !,s
- ,3....'pth,,,.:..:a 8c LONE RORD
. '~~e<.
. r i
.?
'..1.,,.,-....,
.=
1 1 r
- jj,;....u. "'.pRu~.
.as.
.c,Hdy.}qp
.......l.,,,,.........:.,,,,,
1,7
=
i.
++"..
? ;< '.,, = 'I.... -
...,f-2,
...."y o,.;.
s.
t
',**.f,'.'
- q9 l[**
i.
.'[
- 'p
!; {i.
.'lij N
(
r-'
f
.s.,
. b..,
2 2
?
,, 4
'f T
=
.j,' #s j
r.
r :..
i.
s..
,i
,.g,
s
...*,',.i.,,-
/
,. s,.
. -g,,
s.
~
l, 1
,,i.!
m.
r.
PRCIR. C ' 66EE].b.il,
...c.:.,,.<1 '
'f, 2 4 10 Mile Radius Ralease Start: 84/03/28 1905 Wind Speed:
4.0 M/sec Plume Updat e: 84/03/28 1205 Wind Dir. :
170.0 Deg Edge Dose Rate & Type:
6.1E-02 mrem /hr (THYROID)
D I
l e