ML20210J255
| ML20210J255 | |
| Person / Time | |
|---|---|
| Site: | Framatome ANP Richland |
| Issue date: | 07/29/1997 |
| From: | Manning C SIEMENS POWER CORP. (FORMERLY SIEMENS NUCLEAR POWER |
| To: | Harry Felsher NRC |
| References | |
| TAC-L30978, NUDOCS 9708150303 | |
| Download: ML20210J255 (4) | |
Text
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% OS7 From:
Manning, Calvin < Calm @ otter.nfuel.com>
To:
felsher <hdf@nrc. gov >
Datsa 7/29/97 11:19am
Subject:
Questions on NT-IX inner container License Admendment
?hery; All infornal corruspondance regarding criticality safety at SPC should be directed to me.
All offical correspondance regarding licensing actions should be directed to Jim Edgar.
The file that you attaced to your e-mail correspondance is not the final model used in the CSA for the NT-IX inner shipping container. The attached file in a sample input used for a single tier planar array.
Please note that this is simply a sample for one of many conditions evaluated.
The responses to your questions follow:
1.
Why this density of uo27, this wt.% h2o, why this volume fraction of h2o.
Responses the sample input that you referred to evaluates one of many l
conditions. When saturated with water powder densities in the 2.0-2.8 g/cc range produce the highest keff.
At 7 wt.% moisture SPC produced uo2 powder is visibly damp / wet.
The use of 7 wt.% water added to the powder for the case in question is somewhat arbitrary. However, it gives a direct comparison to calculations previously done to evaluate 5-gallon containers stored in similar planar arrays on the plant site.
The conservative way of figuring the wt.% water added to UO2 @ 7 wt. % water is as followa:
density of UO2 /.93= density of uo2-h20 @ 7 wt % water.
2.
Why this density of reg-con?, why this volume fraction of interspersed h2o?
Response
In the limiting calculations the density of reg-concrete is set at the default value of 2.3 g/cc. As you imply by your question it is an error to asse.me reg-concrete has.a density of
.0 g/cc in the limiting case.
The interspersed water density for the cese in question was chosen to represent zero interspersed moderator. The CSA evaluates interspersed moderator at various volume percents at part of the sensitivity studies.
3.
Where did the RES data come from?
Response: The SPC version of KENO.Va has the capability of tracking filghts and arrivals of neutrons from and two materials that are resonance absorbers.
This data is used to calculate the dancoff and L bar actually "seen" by the code. The analyst compares the numbec "actually seen" by the code with the valuc inputed in CSAS. The analysc reviews the results of the calculation and compares the inputed values with those actually seen.
If necessary the cases are repeated with revised RES data.
This process continues until the analyst concludes the correct RES data are used, hf mnm l!I.l!Il.l!Il.lill.Il 11ll!I1111111 9700150303 970729 PDR ADOCK 07001257 C
I The SPC validation of KENO.Va demonstrated that the additions to the code to allow tracking filghts and arrivals from resonance materials does not change the calculated keff when the same input parameters are used.
This enhancement to the code permits the analyst to model plant conditions more correctly.
4.
Why use the same ID & HT?
it appears your HT cylinder data is incorrect. Did you redo analysis with correct dims?
Response: The attached file is a sample input used in the final CSA evaluation. This combined with the drawing provided to you will enable you to create a model from scratch and to compare the SPC Model with the actual size of the container.
5.
Check your reflector data, it appears to be incorrect.
Response: The reflector data places concrete on one side of the planar array
(-z) and water on the otherside of the array (+z).
This is correctly modeled inspite of the comment cards that indicate that both reflectors were placed on the +z face of the model.
6.
Why water bias?
Response: The bias card for water is not used in this calculation. The water is modeled as a single 30 cm thick region. The bias card is included simply so that ten 3 cm thick regions could be used in the model for subsequent calculations if tue analyst chooses to use this option.
7.
Does the lid and bottom have the thickness given?
Response
The drawings previously provided to you list the thickness of the wall and the lid (1.2 mm). The attached file shows the dimmesions used in the SPC model.
You will notice that the SPC model does not include the lid.
This modeling increases keff in the accident condtions where the containers are stacked.
8.
What were your results?
Response: The case attached to this email is for 2.0 g/cc powder saturated with water, keff is 1.01451 +/- 0.003"J.
This same case at 7 wt % water in the powder has a keff of 0.59502 +/-
.00272 I hope this infomation helps you in your evaluation.
- Regards, cal
(( drdb-2.Onr 2061 in drdb-2.Onr ))
=csas25 infinite array of nt9 inner pail 27 infh powder in drum 2.0 gm/cc, sat water uo2 1 den =2.0 1.0 293.0 92235 5.0 92238 95.0 end h20 1
den =1.0 0.81752 293.0 end as304 2 1.0 293.0 end material 3 is borated stainless steel arh-600 specification:
density m.p. deg c element wt.%
atomic density 7.87 g/cc 71540 b
1.0
.00439 fe 68.0
.005773 cr 19.0
.01733 ni 12.0
.00969
' drawing ka-3089 lists chemical compostion as cri 18,0-20.0%
ni:
9.0-13.0%
b:
1.0-1,3%b use arh-600 composition here arbmbas304 7.870 4 1 0 1 5000 1.0 26000 68.0 24000 19.0 28000 12.0 3 1.0 293. end material 4 is reflector water h2o 4 den =1.0000 1.0 293.0 end
' material 5 is regular concrete reg-concrete 5 1.0 293.0 end material 6 is interspersed water h2o 6 den =1.0000 1.0e-6 293.0 end end comp more data res.
1 cyli 3.4126E+00 dan ( 1) 7.1841E-01 res=
2 slab 1.0005E-01 dan (
2)= 3.0960E-01 res=
3 slab 1.9200E-01 dan (
3)= 3.5876E-01 end more nt9 inner pail read parameters tme=60 gen =103 npg=500 nak 0 f1x=yes fdn=yes xs1=yes nub =yes pwt=yes run=yes pit =no end parameters read geometry i
i
' unit 1 com=" single nt-9 inner pail
' pail is 285 +/- 0.3 mm inside diameter and 205 +/- 0.5 mm inside height model assumes id=287 mm inside height = 206 mm borated ring id 276 mm (max) h 180 mm thk 2mm model assumes ring id 283 mm h 180 mm uo2 to maximum id inside of borated ring cyli 1 1 14.15 20.6 2.60 add boronated insert 2.0 mm (. 07 9 ")
thick cyli 3 1 14.35 20.6 2.60 add uo2 under borated ring and out to as304 wall cyli 1 1 14.35 20.6 0.12
' add as304 wall 1.2 mm (0.472") lid ommitted cyli 2 1 14.47 20.6 0.00 cubo 6 1 4p14.47 20.6 0.00 global unit 2 com="6x6 array of nt-9 inner pails with speclar reflection arra 1
-29.3166
-29.3166 0.0 add 30 cm water reflector +z repl 4 1 4r0.0 30.0 0.0 1
' add 30 cm concete reflector _z repl 51 4ro.0 0.0 30.0 1
' end geom read array ara =1 nux=6 nuy=6 nuz=1 fill f1 end fill end array read bias id=500 2 11 end bias read bnds all-specular zfc= vacuum end bnds read plot neh=' 127456' ttl 'zx section at y=0.0 xul=-18. xlr=18.
yul=0.0 ylr=0.0 zul=45.24 zlr=-30.0 uax=1.0 wdn=-1.0 1pi=6 nax=140 end ttl='yx section at z=7. lcm' xul=-38. xlr=38. yul=30.
ylr--30.
zul=7.1 zlr=7.1 uax=1.0 vdn=-1.0 1pi=6 nax=140 end ttl 'yx section at z=1.0cm' xul=-18.
e
. 49 x1r=18. yul 10.16 ylr -10.63625 zul 1.0 zlr=1.0 uax=1.0 vdn--1.0 1pi=6 nax=140 end nch=' f$p*#.' ttl='zx section at y=0.0 xul=-18. xlr=18.
yul=0.0 ylr=0.0 zul=45.24 21r=-30.0 uax=1.0 wdn=-1.0 1pi=6 nax=120 end ttl='yx section at z=7.1cm' xul=-38. xlr=38. yul=30.
ylr=-30.
zul=7.1 zlr=7.1 uax=1.0 vdn=-1.0 1pi=6 nax=120 end ttl 'yx section at z=1.0cm' xul=-18.
xlr=18. yul=10.16 ylr -10.63625 zul=1.0 zlr=1.0 uax=1.0 vdn=-1.0 1pi=6 nax=120 end end plot end data end CC:
Maas, Loren <LorenM@ otter.nfuel.com>
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