ML20245J218
| ML20245J218 | |
| Person / Time | |
|---|---|
| Site: | 07000157 |
| Issue date: | 07/25/1989 |
| From: | Bauer T, Wehring B TEXAS, UNIV. OF, AUSTIN, TX |
| To: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 25822, NUDOCS 8908170585 | |
| Download: ML20245J218 (8) | |
Text
" ' " " " ~ ~ "
"~
T'FI2i lo-'k* "
[
Ny.N sQ'N DEPARTMENT OF MECHANICAL ENGINEERING Q
' l C j?%)
W\\ THE UNIVERSITY OF TEXAS AT AUSTIN l
.m Nud rF ff I
atm 10100Burm
($12)471-5787 U S h c ylfUuTaghe h-S Jggg h (~Tj HUG Ckp: oy
^
y r
n g,.
ujOcctior f
I"WLLibyg l-
- fSS A
Q D0y57 (
i
July 25, Y89 q [g/
Director Office of Nuclear Material Safety and Safeguards U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
SNM-180 Survey of area for release to unrestricted use.
Dear Sir:
The enclosed report is provided pursuant to SNM-180 license (item 17).
Amendment of the license is requested to remove Engineering Science Building Room 32N from the license description. Release of the room 32N area is for unrestricted use.
Sincerely, b %3w Thomas L. Bauer Assistant Director Nuclear Engineering Teaching Laboratory 10100 Burnet Road Austin, Texas 78758 bh W.b Approved:
Bernard W. Wehring, Dir tor Nuc1 car Engineering Teaching Laboratory TLB:j gr Enclosure xc:
B. Wehring B. Bryant l '
ms j
bbl l
8908170583 890723 PDR ADOCK 07000157 fg; C
FDC L
25822
[Dh DEPARTMENT OF MECHANICAL ENGINEERING jd $$ % T' a {. Oil THE UNIVERSITY OF TEXAS AT AUSTIN
.;.I
%6gd5y -
NudearEngimering Tuuhing Laleratory
- 10100 Burnet Rud Asstin,. exas 78738 *($12)471-3727
\\ ;,
v UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of b
The University of Texas 6
at Austin i
Docket No. 50-602 Balcones Research Center Nuclear Engineering Teaching Laboratory (NETL)
AFFIDAVIT Gerhard J. Fonken being duly sworn, hereby deposes and says that he is Executive Vice President and Provost, The University of Texas at Austin; that he is duly authorized to sign and file with the Nuclear Regulatory Commission the attached Request for Amendment of Construction Permit CPRR-123; that he is familiar with the content thereof; and that the matters set forth therein are true and correct to the best of his knowledge and belief.
Qin.. -
Gerhard J. Fonken Exe[utive Vice President & Provost STATE OF TEXAS StateofTexas,thisJ/Jgtobeforeme,aNotaryPublicinandforthe Subscribed and swor
. day of p
, 1989.
hAx6 0A41-
&btary Public in and for the State of Texas
y w.
4 G
- Q,c O
E Report of Survey-License'ShT-180 - Room 32N The University of. Texas at Austin l
License Materials on License SNM-180 consist'of U-235 suberitical assembly.and PuBe neutron sources..The Engineering Science Building (ENS)-
Room 32N was an experiment area for use of the PuBe sources. LAt no time L.
.was the:subcritical' assembly used in ENS room-32N. Periodic surveys of the.
l ENS'32N' area maintained surveillance for surface' contamination on a regular
. basis. Periodic. source swipes monitored the condition of the sealed sources. After removal of all' radioactive materials (including agreement-state materials such as calibration sources) several contamination surveys of the' license area were made. These measurements consist of-3 separate surveys to determine ~the conformance of area surfaces and equipment to the license requirements of.an area to be released for unrestricted use.
The first! survey consisted of-24 samples of an area of concrete block shield wall. Removal of the wall was necessary before other materials could be removed from the area. Approximate wall dimensions were 8 feet high by 16. feet long. Both sides of the wall were sampled with one' sample'
-for each 10 square feet. Swipes were counted by.a-liquid scintillation counter. The largest count rate per minute uncorrected for efficiency was 72 cpm with a: 2 sigma error of 22%. All other count rates were less than 50' cpm. Since the counter efficiency exceeds 90% for all but the lowest energy betas these' activity measurements for surf 3ce rx 4s fo 100 square centimeters'are significantly less than'to 1000 dpm fo' rta gamma activity.
Subsequent measurements of specific pieces of equipment, consisting of 15 samples showed similar results. Maxinum count rate per minute was 61 cpm at 25% error (2 sigma); all other court rates were less'than 50 cpm.
Af ter adjustment the count rate for efficiancy (90%). is still substantially less than 1000 dpm for a 100 aquare centimeter area.
A final survey was made after removal of equipment and all radioactive materials, shields, and other related materials to other license sites. A total of 90 samples of the area was measured by an alpha-beta proportional counter to provide for detection of either alpha or beta activity. The maximum count rate was 54 cpm with an error of 13 %.
An 2
efficiency of 66 % converts the measurement to 82 dpm/100 cm.
No removeable activity was noted in any of the experiment areas,
~
during routine periodic surveys or during the 3 phase cleanup activities in the facility area. Nofixedcontaminagionhasbeennotedbyperiodicarea surveys. A random survey with a 50 cm scintillator probe for alpha-beta activity shows no unusual fixed contamination. Although conditions are not considered credible in which fixed contamination would be present without removeable activity, several. measurement points were made for fixed activity.
Results were negative.
. Table 1 - 5 summarize the survey measurements. The data in Table 3 includes data taken before and after removal of equipment from the room.
O
- - v,
~
a
.. 'f ;
n
. i
[-
L Table 1-
't Source Leak Test. Data Source #
Date DPM*-
M797 1/12/88 7/12/88 1/13/89 l
7/13/89 r
s M798 1/12/88 7/12/88 1/13/89 7/13/89 M799 1/12/88 7/12/88 1/13/89 7/13/89
- Nomeasurablealphaactivgtywasdetectedforthesesources sensitivity'1ess than 10 microcuries
..s
n...
-1. :
h; i
> v;.. r 7 _r, i
+
4 i
L
. Table 2 3
o Phase I Wall Removal Survey 2
-Sample #
'DPM/100cm
- Sample #
' CPM DPM/100cn/
1 37.5 39.5 13 2'
26.5' 27.9 14 4.5 4.07 1 q
3.
8.5 8.9 15 31.0 32.6 i
4<
39.0 41.1 16 10.5 11.1
.\\
)
5 46.5 48.9 17 49.0 151.6 6
4.0 4.2 18 72.0 75.8 l
7 1.0 1.1 19
.0 7.0 7.4 20 8.5
- 8. 9 j
I 9
7.5 7.9 21 33.0 34.7 10 22 16.0 16.8
-11 13.5 14.2 23 32.5 34.2 12 23.5'
.24.7 24 43.0 45.3 l
- Note. liquid scintillation counter efficiency of 95%.
s i
i.
U; 3:r
'd
, E.;,
a..
4@.
- g..
l; * *
{ ': )..' *
'l sg y,;
x 44 1
T h. -
\\
Tabic 3 i
3 3
' i-
. Phase 2.- Couponent Survey
'{
'. Item #
-DPM /100cm DPM /100cm y
.j
]
1 20.5 21.6, 2
,7 2
38.5 40 5 9
i a
j 3
'18.0' 18.9 2
l e.
7 4
13 0i 13.7 2
5' 29.0 30.5 9
\\
]
-6
- 49. 0 51.6 8
1 7
45.0 47.4 L
8 19.0 20.0 9
32.5 34.2 2
10 9.0 9.5 12 x
11 20.5 21.6 3
12 22.5 23.7 13
!6.0 16.8 14-
-13.5 14".2
'3 4
15 61.0 64.2 2
i 16 8
1 f
.17 6
u t
1
- Note (i) Liquid scintillation couster efficiency ~95%
(2) Proportional counter resulta of fixed room compenenets, fans sinks, exhaust etc.
.j i
i' i
I l
l' l
\\
l
- 4
- i..-
~.
1
.)
' ~q-
..%p
,a
_,f
..nl's ;; p 1'
h i
l t
c..:.
g
) ~ 4 4
1 Table 4 1
Ph,ase 3 - Cleanup Supey
]
Data in DPM/100cm Floor Floo'.
Floor Grid #
' Area,.
Grid #
Are.a Grid #
Area 1.-
13 3
25 e
14 6
26 l
M.'
^2 3
15 5
27 3
4 16 28 82 1
a.-
5 3
17 29 2
6 18 5
'30 31 2
7 5
19 1
.8 20 5
32 3
9 8
21 33 10 2
22 34 2
11.
23 35' 1,
12 3
24 3
36 3
South West North East South West North East cU
-Grid #
Wall Wall Wall Wall Grid #
Wall Wall Wall Wall 1
3 32 11 2
2 2
12 3
1 3
3 2
13 6
2
(
4 5
14 9
i 5
3 15 j
6 11 5
16 7
3 17 3
f1
/8
'5 18 5
9 2
19
\\
j
.10 20 1
r.
i.. 1.
p Ob5 n___.-___.._._______--___..
l
Y * '.'!_:f,4 j q
~~
Table 5 Survey for Fixed DPM/100cm Location Counts / minute (1) beta - gamma Millirem /hr 1
197 450 0.3510.50 0.45 2
160 80 0.40 0.30 0.35 3
213 610 0.35 0.45 0.35 4
202 500 0.50 0.60 0.45 5
216 640 0.50 0.45 0.50 6
236 850 0.50 0.40 0.35 7
140 0.40 0.35 0.45 8
194 420 0.50 0.60 0.60 9
187 350 0.30 0.65 0.70 10 212 600 0.30 0.50.0.55 11 165 130 0.30 0.35 0.40 12 213 610 0.40 0.50 0.35 13-237 850 0.40 0.55 0.45 14 194 420 0.40 0.30 0.50 15 216 640 0.40 0.75 0.30 16 17
.18 19 j
20' Background 152 0.40 0.30 0.35 t
1)
Bieron Frisk-Tech with AB50 probe y
calibration - 5/25/89; assume 20% efficient, Tc 99 beta 2)
Bicron - Microrem seter calibration - 5/25/89
)
t
.N
- - - - - - -