ML20125C395
| ML20125C395 | |
| Person / Time | |
|---|---|
| Issue date: | 07/29/1983 |
| From: | Nussbaumer D NRC OFFICE OF STATE PROGRAMS (OSP) |
| To: | Corcoran R MARYLAND, STATE OF |
| Shared Package | |
| ML20125B114 | List: |
| References | |
| FOIA-92-93 NUDOCS 9212110170 | |
| Download: ML20125C395 (11) | |
Text
- 2, P *%g UNITED STATES J
4 NUCLEAR REGULATORY COMMISSION 4
O' o
WASHINGTON, D. C. 20555
{ E (t Ref: SA/ LAB k..../
UUL 29 1983 RECUT W
Mr. Robert E. Corcoran, Chief Division of Radiation Control 1/
Department of Health and Mental Hygiene 39g 3 3g33 201 West Preston Street Baltimore. Maryland 21201 DMSION OF Dear ML.
- ran
HADIATION CONTROC We have received your letter of June 20, 1983, requesting technical assistance on a Neutron Produr.ts amendment.
Our engineering staff has reviewed the submittal, however, they did not have adequate information to permit a suitable analysis. We need additional information on the following items:
1.
A more detailed description of the source,'includs procedures and standards required for fabrication and examination of the source.
2.
Descriptions of the operating conditions intended for the source including any limitations (environment, temperature,
(.
cycles,etc.).
3.
Maximum stress levels expected and maximum number of cycles in design life of source.
How does the enclosed O'Donnell &
Associates, Inc. report apply to the change?
4.
Are any operating restrictions being recommended for the amended license by the applicant or being considered by the State that shou'Id be considered in an analysis?,
5.
Was ANSI N538 or DOT Special Form testing *< formed on the source? If not, please provide data that snows the source will meet these requirements.
The source should be evaluated
'~
to the new, July 1983, DOT Special Form testing requirements.
We will continue our review upon receipt of the above information. -If.
you have any questions, please let us know.
O ENCLOSUfLE I
To
- umee, w lili@3, C. SMEbid M.
km, TC R. 0 ORC 0f 4d recIorfor RECEIVEL sat State Agreements Program i-Office of State Programs NOV 171923 9212110170 920504
//
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Determination 1.
Component / system /struct,ure with the nonconformance (Itc) 2.
llature of the liC (reference the appropriate specification, criteria, or drawing) 3.
klio discovered the 1:C7 4.
k' hen uns the NC discovered?
5.
11ou vas the !!C discovered?
6.
Cause, of the Itc.
i Part I Author:
Signature _
_ Date Complete Parts II aiid III, as appropriate.
Route to QA Manager.
II.
Significance Part II Author:
signature Date Complete-Parh III as appropriate.
Route to appropriate Vice President or qp !!anager.
Vice Presideni o,r QA Manager Acknowledgeeent:
Signature Corrective Action Assigned:
1 III.
Recom:r.cnded Correr tive Actions 1.
Recoenended repair 2.
Inspection / testing requirements of fix w e
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DIVl3M CF
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3.
1 told points during repair 4.
Determination of repair needed referred to 5.
Design review required 6.
Repair requires approval of Part III Author:
Signature Date Route to abpropriate Vice President.
Vice President Approvil:
Signature QA Manager Approval:
Signature IV.
Corrective Action Documentation 1.
Component /systett structure with the nonconformance (;.6),
2.
Design reviu date 3.
Inspection or testa of repairs required
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Corrective actiop ta n
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Repair performed by I,
6.
Repair date I:
7.
Inspection or test (of repair) date Part IV Author:
Signature Date Route to QA Manager.
Action Completed:
QA Acknowledgement:
Signature
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FINAL ACCEFI'ANO2. -
DAT2 UmsvN OF.
'4 s JCM lt
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i.., A. $ ~!b ~ sff FitOM : Cacmine Smedita DATE: October 27, 1983
SUBJECT:
Dickerson II Source Plaque Analysis As part of our internal review o'f the 'Analys'is of Permissible Activity for the Dickerson II Irradiator, prepared for the :taryland DilMH, 1 performed e
independent calculations of the anticipated external source temperatures. My analysis confirmed that the analysis submitted in your letter of June 3, 1983 to D! nth is conservative.
The fundamental conclusions of my calculations are that there is no practical significance to limiting the total activity in a sourcer that a more significant specification is the activity per unit lengths and that a license limit of 30,000 ci/ft for any size source is sufficient to assure that the surface tem;>erature of any practical irradiator source will not exceed 6290F.
\\
In additio,n it is worth noting that a typical 9/16" diameter NPI teradiator source of the.present design"will have a_ cobalt loading not exceeding 150 gms/ft. Thus a 30,000 ci/ft source would require the use of 200 ci/gm material which ic nearly twice as high as anything we are likely to use for radiation processing ' sources.
It is possible hot:ever to put about 270 gms/f t in a 9/16' diameter source which would require a cpecific act.ivity on the order of 100 ci/gm for a-30,000 ci/ft source. The-surface temperature of this source would not exceed 6130F, and the internal temperature gradient would be of no importance because in auch a source the inner capsule would essentially contain a single solid. rod.
l Enclosed you will find the details and results of my calculations.
j.
f i
i
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I RECEIVED t-I g
7g ENCL osvEE
~7 DIVISION OF.
L.h # t e R It fly l[3 RADIATION CONTROL
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$ /M E D D
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neutron PRODUCTS inc
Radiation Processing Source Temperature Calculations calculations of the external temperatures of irradiator sources were performed as follows:
1.
Determine the total heat generated in a source, 07, from a.
Gan;ma ray self attenuation = Q 3A 3
b.
Beta ray self 4.ctenuation = Og3A c.
The absorbed samma dose from the other soruces in the plaque = OpA He r.c e t QT=06SA + OBSA + O A P
2.
Use natural convection with 1000F air and radiation to 1000F surfaces in the irradiator cell to remove the heat.
Hence:
g = otA ( (1bO) - 983) + hA (T-560)
Radiation Heat Transfer Natural convection heat transfer for source of temperature for source of temperature (T) in (T) in 0 Rankina to O Rankine with 1000P Air 1000F surfaces 2
4 a = Stephan Boll: man Constant =.173 Btu /hr-ft _oR c = emissivity; assumed to be =.3 A = source surface area in ft2 h=naturakconvectionheattransfercoefficient=.27'(
).25
-100 9
Btu /ht-ft where T is in OF, D is the source diameter in feet.
2 SolvetheabovhequationsforT.
Note that this method ignores the fact that there is d forced flow of air through the irradiator cell.
It also ignores any heat transfer by conduction which may tak. place from the source to the racks to the pool water.
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RECEIVED t!)V 171993 DIVISION Or
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DETERMINATION OF RADIATION PROCESSING SOURCE TEMPERATURES h;}
cd Source Diameter 1"
l' 9/16' 9/16" 3/8" d
Camma self. absorption 251 20t 154 10%
9%
C Beta s' elf.pbsorption 1001 1001 1001 1004 1001
-!,oading, (gms/f t) 850 500 270 150 100 1
. [
Curies / foot 30,000 30,000 30,000 30,000 30,000 g
Specific a,ctivity (Ci/gm)-
35 60 111 200 300 g
Plaque dose rate MR/hr 10 10 10 10 10 Heat from gamma 375 300 225 150 135 Absorption (Btu /hr)
Heat from beta 57 57 57 57 57
'*9 Absorption (Btu /ht) li Heat from plaque 81 47' 19 10 10 O
Exposure (Btu /hr)
Total Heat (Btu /hr) 513 404 301 217 202 4
d Heat transferred by 178 129 93 60 57 Thermal radiation (Btu /hr)
Heat transferred by 335 275 208
,157
- 145 e
Natural convection (Btu /hr)
- -8
'sJ External Source Temp. ( F) 629 552 613-511 590
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+
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---