ML20134J688
| ML20134J688 | |
| Person / Time | |
|---|---|
| Issue date: | 10/24/1996 |
| From: | Bangart R NRC OFFICE OF STATE PROGRAMS (OSP) |
| To: | Volpe J KENTUCKY, COMMONWEALTH OF |
| References | |
| NUDOCS 9611150344 | |
| Download: ML20134J688 (7) | |
Text
_ = _ -.. - - -.. -
8 John A. Volpe, Ph.D., Manag:r DCT 2 4 W i
Radi: tion cnd Tcxic Agints Control S ction Cabinet for Health Services 275 East Main Street Frankfort, KY 40621-0001
Dear Mr. Volpe:
This is response to your letter of May 22,1996, requesting assistance in resolving the l
long standing issue related to the short term use of an EMR/Schlumberger, Model 758, j
neutron generator at Western Kentucky University.
Jim Myers, of our Office, has been in touch with you over the last several months to discuss aspects of the use of the neutron generator. A quick search of the resources on-the Internet did not produce information that would be directly applicable to this situation.
I Most information found related to activation products produced by very large accelerators, or radioactive devices, that were used over very long time periods in the same facility.
i Although the EMR/Schlumberger device produces 14 MeV neutrons, it is unlikely that i
significant activation products would have accumulated during its very short exposure cycle. Any activation products which may have been created in the concrete while the device was in use would not appear to create a health hazard to future occupants of the room. This finding was confirmed by surveys conducted by your office which allowed the j
room to be subsequently released for unrestricted use. Absent new information j
contradicting the use of the generator, further investigaiic:: into this issue would appear to be unwarranted.
l_
If you have any question regarding this correspondence, please contact me or Jim Myers at (301) 415-2328 or E-mail JHM@NRC. GOV.
i d
Sincerely, s
i Originat sianed By - 1 l
'IttCHAF' 'GAUN Richard L. Bangart, Director i
Office of State Programs l
j Distribution:
DlR RF (6S-142)
DCD (SPO6)
RLBangart PDR (YES X NO
)
PLohaus SDroggitis JMyers DCooi 150039 Kentucky File
'See previous concurrence.
DOCUMENT NAME: G:\\JHM\\VOLPE3.JHM
\\
To receive a copy of this document, Indicate in the box: "C" = Copy without
\\
attachment / enclosure "E" = Copy with attachment / enclosure "N" = No copy OFFICE OSP l
OSP:DD
[
IMNS:D l
OSP:gh l NAME JMyers:maj PHLohaus DCool RLBangartHd DATE 10/01/96*
10/03/96*
10/09/96*
10/p1/96 OSP FILE CODE: SP-AG-11 e
4 9611150344 961024
'"f"*%
NRC HLE CMTS COPY
e c
y UNITED STATES j
j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20eE4001 October 24, 1996 3
L John A. Volpe, Ph.D., Manager Radiation and Toxic Agents Control Section Cabinet for Health Services i
275 East Main Street Frankfort, KY 40621-0001
Dear Mr. Volpe:
This is response to your letter of May 22,1996, requesting assistance in resolving the long standing issue related to the short term use of an EMR/Schlumberger, Model 758, i
neutron generator at Western Kentucky University.
j Jim Myers, of our Office, has been in touch with you cesc the last several months to discuss aspects of the use of the neutron generator. A quier search of the resources on the Internet did not produce information that would be directly applicable to this situation.
Most information found related to activation products produced by very large accelerators, l
or radioactive devices, that were used over very long time periods in the same facility.
Although the EMR/Schlumberger device produces 14 MeV neutrons, it is unlikely that significant activation products would have accumulated during its very short exposure cycle. Any activation products which may have been created in the concrete while the device was in use would not appear to create a health hazard to future occupants of the room. This finding was confirmed by surveys conducted by your office which allowed the room to be subsequently released for unrestricted use. Absent new information contradicting the use of the generator, further investigation into this issue would appear to be unwarranted.
If you have any question regarding this correspondence, please contact me or Jim Myers at (301) 415-2328 or E-mail JHM@NRC. GOV.
Sincerely, l(
g?a Q Ric ard L. Bangart, Director Office of State Programs i
=
=-
4 John A.
Ipe, Ph.D., Manager Radiation an Toxic Agents Control Section Cabinet for H lth Services 275 East Main treet Frankfort, KY 4 21-0001
Dear Mr. Volpe:
This is response to you letter of May 22,1996, requesting assistance in resolving the long standing issue relat to the short term use of an EMR/Schlumberger, Model 758, neutron generator at West m Kentucky University.
t Jim Myers, of our Office, ha been in touch with you over the last several months to discuss aspects of the use of e neutron generator. A quick search of the resources on the Internet did not produce inf mation that would be directly applicable to this situation.
Most information found related t activation products produced by very large accelerators, or radioactive devices, that were u ed over very long time periods in the sarpe facility g/ Net / pThe EMR/Schlumberger device prod ces 44elativ2/ 'av. enewri14 MeVffieutronsjis unlikely that significant activation pr ucts would have accumulated _du in its very short exposure cycle. The sniell ydsnidies MM3vation producthe concrete hich may have been created /while the device wa in use would not appeFtB~iffM e a health hazard -
to future occupants of thegog.,Jhjs fi dingjppfc?!!c be confirmed by surveys j
conducted by your office,and the room'4 u'6sequentpeleasel r unrestricted use.
fo Absent new information cc,ntradicting the se of thd' generator, further investigation into this issue would appear to be unwarranted.
If you have any question regarding this corres ondence, please contact me or Jim Myers at (301) 415-2328 or E-mail JHM@NRC. GOV.
- incerely, Richa L. Bangart, Director Office f State Programs Distribution:
DIR RF (6S-142)
DCD (SP06)
IllBangart PDR (YES X--
NO
)
Flohaus LDroggitis Jt'p,JJ JMyers
,y Kentucky File DOCUMENT NAME: G:\\JHM\\VOLPE3.JHM A
' k 7 ".e.w. n.: w.4
.t.i.4.. i. $. w c m y A nooi g f
'w.
.c. c,,,%.n.,,,,,u,,,,,,,...,,,,,,,
0FFICE OSP wl 0514 0 V IMNS:D l
OSP:D l
l NAME JMyers:kk T PHLohabs DCool" RLBangart DATE 10/ / /96 10/ y /96 10/ 'l /96 10/
)
if
.l Y
- John A. Volpe,' Ph.D.', Manager,
l Radiation and Toxic Agents Control Section Cabinet for Health Services 275 East Main Street Frankfort,' KY 40621-0001
Dear Mr. Volpe:
This is response to your letter of May 22,1996,(equesting assistance in resolving the long standing issue related to the short term use of an EMR/Schlumberger, Model 758, neutron generator at Westerri Ken'tucky University Jim Myers, of our Office, has been in touch with you over the last several months to discuss aspects of the use of the neutron generatok A quick search of the resources on the Internet did not produce information that would be directly applicable to this situation.
Most information found related to activation product's produced by very large accelerators, or radioactive devices, that were used over very long\\ time periods in the same facility.
The EMR/Schlumberger device produces a relatively low energy (14 MeV) neutron. it is unlikely that significant activation products would hav's accumulated during its very short exposure cycle. The small quantities of an activation pjoduct in the concrete which may
' have been created while the device was in use would not appear to create a health hazard to future occupants of the room. This finding appears lo be confirmed by surveys conducted by your office and the room's subsequent rel' ease for unrestricted use.
. Absent new information contradicting the use of the gerkrator, further investigation into this issue would appear to be unwarranted.
if you have any question regarding this correspondence, p. ease contact me or Jim Myers at (301) 415-2328 or E-mail JHM@NRC. GOV.
Sincerely, Richard L. Bangart, Director Office of Sta'e Programs t
Dist ibution:
DIR ltF (65-142)
DCD'(SP06)'
RL8angart PDR (YES X NO-
)
PLohaus.
SDroggitis JMyers y
Kontrcky File DOCUMENT NAME: G:
A n
w..
,.em.
\\.JHM\\VOLPE3.JHM. w n..:
c Mhanom mi.ch,n.nu.new...
r - copy with.ti. chm.n /.nclosw.
- N* = No copy
.we 0FFICE OSP, #-l
' OS$W\\ -l IMNS:D
-l-
-OSP:D l
l NAME JMyers:kk T PHLohabs DCool RLBangart DATE 10/ / /96 10/ ( /96-10/
/96 10/1 /96 OSP FILE-CODE: SP-AG-ll l
\\
NYzi) ledL PHL Sco EXECUTIVE TASK MANAGEMENT SYSTEM
<<< PRINT SCREEN UPDATE FORM >>>
TASK # - 6S142 DATE- 05/30/96 MAIL CTRL. - 1996 TASK STARTED - 05/30/96 TASK DUE - 06/13/96 TASK COMPLETED -
/
/
TASK DESCRIPTION - 5/22/96 LTR UNSAFE USE OF NEUTRON GENERATOR AT WESTERN KENTUCKY UNIVERSITY REQUESTING OFF. - KY REQUESTER - J.
VOLPE WITS -
0 FYP - N PROG.- JHM PERSON -
STAFF LEAD - JHM PROG. AREA -
PROJECT STATUS -
OSP DUE DATE:
6/14/96 PLANNED ACC.
-N LEVEL CODE -
1 i
h 4-
--w am-
. -. ~ -. _...
i
~5NM
%.- Cm vv Nke b bl=g
%d Nere%\\(khg ack%,
toAw% wh R% nrwss.
\\k so 3(kh gov QYodt ow (s%whh be b%\\
%M k 618 Asaa 6/n/e
_ ~9am _
y k
CABINET FOR HEALTH SERVICES COMMONWEALTH OF KENTUCKY I
L e
FRANKFORT 40621-0001 A@
k
, DEPARTMENTIUR HEALTH SERVICES d
May 22, 1996 PAUL H LO US DEPUTY DIRECTOR OFFICE OF STATE PROGRAMS U S NUCLEAR REGULATORY COMMISSION WASHINGTON D C 20555 DEAR MR. LOHAUS:
This office has conducted an investigation involving alleged unsafe use of a neutron generator at Western Kentucky University.
It could not be determined, based on interviews conducted with individuals involved, that the generator was used at any time other than during a shielding evaluation.
There appear to be no witnesses to document use of the generator at any time other than the single instance when the users of the generator admit to conducting a test to determine shielding adequacy.
The individual who brought this situation to our attention still has concerns regarding how many times the generator may have been used, and any resultant potential exposures to other individuals.
He believes it is necessary to obtain a core sample of the concrete beneath the location of the generator for neutron activation analysis to verify whether the generator was in fact, used on multiple occasions. The gentleman has agreed that if the Nuclear Regulatory Commission indicates this would not be practical or necessary, he will feel that the investigation is concluded.
If the analysis is deemed to be necessary, the University would be instructed to obtain the sample and submit it to a third party, selected by this office, for analysis.
The generator which was used is a EMR/Schlumberger, Model 758, with a 7-10 curie tritium source, in a sealed envelope.
A copy of the Sealed Source and Device Registry Sheet is enclosed for your convenience.
The generator is capable of producing fourteen (14) MeV neutrons.
Please inform this office if you consider the neutron activation analysis to be indicated in this situation.
If additional information is needed, please contact Radiation Control staff at (502) 564-3700.
e
- ely, t$2b
/
ohn A. Volpe, Ph.D., Manager Radiation and Toxic Agents 4,yn, Section
[yU i V ]()()J J f
f$
.....1 REGI$TRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SATETY EVALUATION OF DEVICE s
NR-316-D-101-S DAU: July 14, 1992 PAGE 1 OF 7 DEVICE TYPE:
Neutron Generator MODELS:
758, 761, 762 MANUFACTURER / DISTRIBUTOR:
EMR Photoelectric Technology A Division of Schlumberger Corporation P.O. Box 44
. Princeton, NJ 08542-0044 ISOTOPE:
MAXIMUM ACTIVITY:
Hydrogen-3 (Tritium) 10.0 Curies trax TEST FREOUENCY:
Not Required PRINCIPAL USES:
(F)
Well Logging CUSTOM DEVICE:
YES X
NO L91 h t ? e r i I
I W V l() ' (J U( l
__l
1 REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SATETY EVALUATION OF DEVICE H2&:
NR-316-D-101-8 D&Ig: July 14, 1992 PAGE 2 OF 7 DEVICE TYPE:
Neutron Generator DEECRIPTION:
The EMR Photoelectric Models 758, 761, and 762 neutron generators are small, high-voltage accelerators used to generate high energy neutrons reaction.(14.2 MeV, 1.42 Joules) from a deuterium-tritium fusion nuclei of surrounding material (ex. marth in well-loggingNeutron applications).
and related to the properties of the surrounding material.The results of of ceramic and metal.The devices are comprised of a hermetically sealed envelope m places inside the envelope: Deuterium and tritium are adsorbed in two a thin metal film coating the face of coiled tungsten filament.a copper target post and in another thin metal film coating a opposite ends of the envelope.The target and filament are located at Neutron generation may only take place when a high voltage charge is applied to the generator.
activation, the current causes the tungsten filament to heat upOn releasing the deuterium and tritium into gaseous form inside tne sealed envelope.
particles toward the copper target which, upon impact, causeThe app neutron production through a' deuterium-tritium fusion reaction.
The generator envelopes for all three models are constructed trade name for a Fe/Ni/Co alloy used for sealing to ceram and 0FHC copper.
Model 758 also contains a small section of stainless steel.
by a brazing practice using a cu-Ag eutectic braza material.The metalliz envelope seal is done with a cold-weld pinch-off which is then All protected by a thin metal overlay which is soldered in place.
Wall thicknesses vary according to the material used.
range from approximately 0.020" to 0.030" The matals thick, while the ceramics are all approxima(tely0.51 to 0.76 mm) thick.
that the 758 uses stainless steel for its midsection w 761 and 762 use Kovar.
Another' difference of note is physical size.
The 758 is approximately 5.5" in diameter, the 761 is appr(oximately 4.7" (12 cm)14 cm) in length b (2.54 cm) length by 1" (2.54 cm) in (14 cm) in length by 2"in diameter, and the 762 is approxinately 5"
(5.1 cm) in diameter.
- 1
l
~
l
)
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE EQt:
NH-316-D-101-S D&IX: July 14, 1992 PACE 3 OF 7 Device TYPE:
Neutron Generator DESCRTPTION: (Cont'd)
The neutron generators are designed to be placed inside of a metal high voltage assembly.
For the Models 758 and 761 this assembly consists of a long, cylindrical, sealed tube approximately 1.68" (4.3 cm) in diameter and 84" (2.13 m) long.
The tool assembly for the 762 is larger in diameter and measures approximately 30" (76 cm) in length.
The assemblies are constructed of metal, are completely sealed, provide additional protection from damage to the capsula and would contain any tritium gas if the generator capsule should break and/or leak.
The assembly used with the Models 758 and 761 is designed for use in well logging applications.
The assembly used with the Model 762 is designed for use in devices which perform elemental analysis of bulk material in non-well logging applications.
LABELING:
The external surface of each neutron generator target is engraved with a target assembly I.D. number consisting of year-month-day (date of construction) serial number assigned to the neutron generator.and target position and the sequentia tritiation, the neutron generators have the model number (758, After 761, or 762) and " Radioactive H3" etched or engraved on the annulus of the and Kovar piece at the pinchoff end.
remaining annular space is taken by a second engraving of the The serial number.
DIAGRAMS:
see Attachments 1 and 2.
CONDITIONS OF NORMAL USE:
These neutron generators may be used in well logging applications and in devices which perform elemental analysis of bulk material such as in airports and laboratories.
would present the most hazardous environment.Well logging applications Therefore, the generators are designed to withstand this type of environment.
4
~
b REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVIC SAFETY EVALUATION OF DEVICE H22:
NR-316-D-101-S DAIE: July 14, 1992 PACE 4 oF 7 DrvicE TYPE:
Neutron Generator CONDITIONS OF NORMAL USE: (Cont'd)
The capsules are designed for the following operating conditions:
e Operating temperature:
-4'F to 325*F (-20*C to 163 *C) with brief excursions of -67'F to 392*F (-55*C to 200*C) allowed for one hour or less, e Thermal cycling (non-operating) of 50*F/ min (10*C/ min) with half-hour dwell limits of 32*F and 437'F (O'c and 225'C).
Up to a 100 g shock of 8 millisecond duration along the revolution axis and any perpendicular axis.,
Sinusoidal vibration up to 7.5 g from 10 Hz to 18 Hz, except limited to 0.5" along the revolution axis and any perpendicular axis.(1.27 cm) doub Mechanical strength: Up to 80 psi (552 kPa) in tension.
Storage temperature between -67'F to 122*F (-55'c to 50*C)
Operation of the generator at voltages in excess of the Also, at temperatures above 1832*F (1000*C) desorption of th tritium will occur.
breached at this temperature, leakage of tritium gas may resultIf the in PROTOTYPE TESTING:
A fully operational Model 758 generator was tested for' resistance to multiple shocks (50 each) at various levels ranging from 110 g to 550 g for durations of 11.5 as to 3.4 as respectively.
maximum expected shock during normal handling and'use is 100 g.
The The generator was initially tested with partial power applie normally.
The unit was ratested with full power applied.
showed that th?
'3 nit performed normally.Following the second series of tests, an been breached. unit is an indication that the integrity of the capsule has notNormal op i
i REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVIC SAFETY EVALUATION OF DEVICE M22:
NR-316-D-lo1-5 D&II: July 14, 1992 PACE 5 OF 7 Device TYPE:
Neutron Generator PROTOTYPE TESTINc: (Cont'd)
The manufacturer states that the Model 758 has been in use since 1985 with minimal reported failures or breakages and the Model 761 has been in use since 1988 with no reported failures or breakages.
shown to have an approximate " working life" of three years unde normal conditions of use.
governed by operational efficiency.The " working life" of the unit is EXTERNAL RADIATION LEVrrs:
The generator only produces neutron radiation when high voltage is applied.
In the " power off" condition, no neutron radiation will be produced; however, gamma radiation may be present as a result of neutron interaction with the components of the generator itself and the high voltage assembly.
The majority of the gamma radiation produced is due to activated aluminum, copper and iron with short half lives (less than lo minute half life for the copper target and aluminum in the ceramic envelope components and less than 15 hour1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> half life for the copper and aluminum components of the generator and the iron cosponents of the assembly).
not contribute significantly to the radioactive output. Longer-lived activation prod hour after the units were shut off following three hours ofradia The continuous operation.
Three hours is a t for the units to be turned on during use.ypical period of time ETAPSED TIME lo min./N 8227 S/N 8299 S
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> lo min.
I hour DISTANCE Radiation Levels (aren/hr (pSv/hr))
s em 3.4 (34.o]
1.2 [12.0) 4.o (40.o) 1.o [lo.o) so en o.3
[3.o]
o.1
[1.o]
o.as [2.s) 0.09 to.9) 100 cm o.oS Co.8) 0.02 to.2) 0.02 to.2) 0.02 to.2)
Typically, surface gamma radiation levels will fall below.2 mram/hr (2o pSv/hr) within twenty four hours after use.
l t
REGISTRY OF RADIOACTIVE SEALED SOURCSS AND DEVICES j.
{
SAFETY EVALUATION OF DEVICE i
i
}
HQt:
NR-316-D-101-S i
DAIE: July 14, 1992 PAGE 6 OF 7 5
DEVICE TYPE:
Neutron Generator 3
d j
OUALTTY ASSURANCE AND CONTROL
- The manufacturer claims to maintain a Quality plan that meets the
}
following MILITARY STANDARDS:
i MIL-Q-9858 " Quality Program MIL-STD-45662 " Calibration System Requirements". Require
{
j All neutron the end product must meet the internal standards of a i
i' vacuum device.
Additionally, material procurement checks j
in-process assambly inspections and performance testing ar,e j
l performed and documented under the manufacturer's Quality Plan.
LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USEt 4
- The Models 758, 761 and 762 neutron generators shall be distributed only to persons specifically licensed by the NRC i
or an Agreement State.
Handling, Storage, Use, Transfer, and Disposal:
determined by the licensing authority.
To be i
In view that these activated, they should be handled only by experiencedgen i
personnel using adequate remote handling equipment and j
procedures.
i
- This registration sheet and the information contained with the references shall not be changed without the written i
consent of the NRC.
I The generators shall not be subjected to environmental and i
conditions specified in the users manual and in theuse con i
" Conditions of Normal Use " section above.
REVIEWER NOTE:
The generators are exempt from leak testing i
requirements.
However a significant reduction in the operational efficiency,of the unit may indicate leakage of the souros.
be taken out of service and tested for leakage usingA devic j
techniques capable of detecting the presence of tritium.
dealing with this possibility.The licensee should develop proc J
. ~
REGISTRY OF RADIOACTIVE SEA 1.ED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE EQ,.:
NR-316-D-101-S g&'Ig: July 14, 1992 PAGE 7 OF 7 DEVICE TYPE:
Neutron Generator SAFETY ANALYSIS EUMMARY:
Based on our review of the information and test data cited below and the past use history of the Models 758 and 761, we conclude that the Models 758, 761 and 762 n acceptable for licensing purposes.eutron generators are Furthermore, we conclude that these neutron generators would be use which might occur during the uses specified in thisexpected t registration sheet.
REFERENCES:
The following supporting documents for the Models 762 neutron generators are hereby incorporated by reference and 758, 761 and are made a part of this registry document:
- EMR Photoelectric's letters dated July 16, 1991, September 5, 1991, July 17, 1992 with enclosures thereto.1991, January 13, 1992, and January 15, ISSUING AGENCY:
U.S. Nuclear Regulatory Commission Date:.
July 14. 1992 Reviewer:-
b 4
Date:_.
July 14. 1992 Concurrence:_
Ne 0
0 e
9
3-~
, w.-* ; g ' ~..N, _ a. ^. rW q.,
.9.
REGISTRY OF RADIOACTIVE SEiLED SOURCES AND DEVICES i
SAFETY EVALUATION OF DEVICE EQa.:
NR-316-D-101-8 g}A22;: July 14, 1992 ATTACHMENT 1 DEVICE TYPE:
Neutron Generator SS APPROX.
STAINLESS XDVAR -
STEEL TIG VELD-
- KDVARJ-
---)(DVAR!
j W
'{-CDPPER
~~
,s d
s
-2 x
CDPPER TIG VELD CERAMIC -
IRAZE 10 KOVARF
- PROTECTIVE.01 PlNCH-DFT CAP - Sm.DERED 1.0' DIA. APPRDX.
MODEL 758 IElm0N IDOWOR N01 WLigg utraY 5/h00(L M8 M8 IED[L
'[
5
( -s.s,
~
'"~
~
~~
\\
t
,./.-.
egg
}
l
r--
I REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE EQ.a.:
NR-316-D-101-S DAT.E: July 14, 1992 ATTACHMENT 2 DEVICE TYPE:
Neutron Generator 3r appeos.
gg gg g, MADC MM UfRON ( M DR r-
/
/
l L
1
/
t t
J l
Y I
-.. r 1
i
\\
l
~
l l
w uM mom muct atamar FlW WONI10R NEVIRON GENERATOR IDCH VOLTAGE ASSEusty FOR CENERAL NEUTRON SOURCE APPUCATONS.
4 9
4
0 8
\\
&W '
'\\
O' f 0* b"'k
~
{}[) it fli:
dh, w f Arc h'"<
ryesamtola t h
p adu b pneA4 i
(b] ( d ui eb to e A y p.cl I f d d o k,ges,y4,{ c u,,[ ] c ', /
s
~
ben t I ' ' [Lig s cn
.g i
fY v
Q f'
Q.g(p I
d(
g f _ (,
"gs
(s.
{
GWjk s
I i
o
MEMORANDUM T0:
Bill M. Morris, Director Division of'Resulatory Applications Office of/ Nuclear Regulatory Research FROM:
Richard L. Bangart, Director Office o State Programs
SUBJECT:
0FFICE CONCURRENCE;/ REVISED PART 34 We have reviewed the revisio\\
ps to art 34 submitted with your memo of May 9, 1996 and concur in the changes.
\\
The incorporation of the requir ment for two qualified individuals to be present during radiography ope,ations and certification of radiographers will help establish uniform, nation 1 standards in industrial radiography. The return to the language curren 1y\\used in Part 34.20 (b)(2), (e) and (f) will lessen confusion about perfor)mance_ standards for radiography equipment during time needed to re-evaluate t e requ_irement.
x Ifyouhaveanyquestionsr/egardingtbiscorrespondence,pleasecontactmeor the individual named below/
POINT OF CONTACT: Jim ers TELEPHONE:
(301)'415-2328 FAX:
(301) 415-3502 INTERNET:
JHM@NRC. GOV Richard L. Bangart, Director Office of State Programs cc:
C. Trottier, RES Distribution:
DIR RF DCD (SP02)
RLBangart PDR (YES X N0
)
PLohaus SDroggitis JMyers RES File DOCUMENT NAME: G:\\JHM\\.PT34 FIN.JHM j
n
.. i..s. m:
- c.. co,,.i.nooi..cs
,.ocio.o,.
. co,,.iis... sm.oi,.ocio.o,.
u. no..,
0FFICE OSP l
OSP:DD OSP:D l
NAME JMyers PLohaus RBangart DATE 05/
/96
/ /96
/ /96 OSP FILE CODE: SP-0-ll i
CABINET FOR HEALTH SERVICES COMMONWEALTH oF KENTUCKY 1 2 N l FRANKFORT 40621-0001 w"
DEPARTMENT FOR HEALTH SERVICES May 22, 1996 PAUL H LO US DEPUTY DIRECTOR OFFICE OF STATE PROGRAMS U S NUCLEAR REGULATORY COMMISSION WASHINGTON D C 20555 DEAR MR. LOHAUS:
This office has conducted an investigation involving alleged unsafe use of a neutron generator at Western Kentucky University.
It could not be determined, based on interviews conducted with individuals involved, that the generator was used at any time other than during a shielding evaluation.
There appear to be no witnesses to document use of the generator at any time other than the single instance when the users of the generator admit to conducting a test to determine shielding adequacy.
The individual who brought this situation to our attention still has concerns regarding how many times the generator may have been used, and any resultant potential exposures to other individuals.
He believes it is necessary to obtain a core sample of the concrete beneath the lucation of the generator for neutron activation analysic to verify whether the generator was in fact, used on multiple occasions. The gentleman has agreed that if the Nuclear Regulatory Commission indicates this would not be practical or necessary, he will feel that the investigation is concluded.
If the analysis is deemed to be necessary, the University would be instructed to obtain the sample and subnit it to a third party, selected by this office, for analysis.
The generator which was used is a EMR/Schlumberger, Model 758, with a 7-10 curie tritium source, in a sealed envelope.
A copy of the Sealed Source and Device Registry Sheet is enclosed for your convenience.
The generator is capable of producing fourteen (14) MeV neutrons.
Please inform this office if you consider the neutron activation analysis to be indicated in this situation.
If additional information is needed, please contact Radiation Control staff at (502) 564-3700.
c
- ely,
/
ohn A. Volpe, Ph.D., Manager Radiation and Toxic Agents Section "An Equal Oppommity Employer WFal' (6
00
b\\M
~3A. - Cxn yv hkch bl og
% d Nc4e% \\ 6ceTg n.e k %
toAwAc wh Oh nmss.
\\ k.so 3 (kh gov QTod t m es%whh b e hTe\\
%W k
61 8
4,1. ' e,.' i &
W
+4l69;f A'f e -k;
., _9 b,.
e';*
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE E9s.:
NR-316-D-101-S DATE: July 14, 1992 PAGE 1 OF 7 DEVICE TYPE:
Neutron Generator MODELS:
758, 761, 762 MANUFACTURER / DISTRIBUTOR:
EMR Photoe1ectric Technology A Division of Schlumberger Corporation P.O. Box 44
. Princeton, NJ 08542-0044 ISOTOPE:
MAXIMUM ACTIVITY:
Hydrogen-3 (Tritium) 10.0 Curies LEAK TEST FREOUENCY:
Not Required PRINCIPAL USES:
(F)
Well Logging CUSTOM DEVICE:
YES Y
NO O
e f
I o
00 Sh q(
a.
i REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE HQt:
NR-316-D-101-s DATE: July it, 1992 PACE 2 OF 7 DEVICE TYPE:
Neutron Generator DESCRIPTION:
The EMR Photoelectric Models 758, 761, and 762 neutron generators are small, high-voltage accelerators used to generate high energy neutrons reaction.(14.2 MeV, 1.42 Joules) from a deuterium-tritium fusion Neutrons emitted from the generator interact with the nuclei of surrounding material (ex. marth in well-logging applications).
and related to the properties of the surrounding material.The results of the of ceramic and metal.The devices are comprised of a hermetically sealed envelope m places inside the envelope: Deuterium and tritium are adsorbed in two a thin metal film coating the face of coiled tungsten filament.a copper target post and in another thin metal film coating a opposite ends of the envelope.The target and filament are located at place when a high voltage charge is applied to the generator. Neutron generation activation, the current causes the tungsten filament to heat upOn releasing the deuterium and tritium into gaseous form inside the sealed envelope.
The applied voltage causes a flow of ionized particles toward the copper target which, upon impact, cause neutron production through a' deuterium-tritium fusion reaction.
The generator envelopes for all three models are constructed similarly from high density metallized alumina ceramic, Kovar and OFHC copper. trade name for a Fe/Ni/Co alloy used for sealing to ceramics),(a stainless steel.
Model 758 also contains a small section of by a brazing practice using a Cu-Ag eutectic braze material.The metallize metal-metal joining is accomplished by a tig weld, and the final All envelope seal is done with a cold-weld pinch-off which is then protected by a thin metal overlay which is soldered in place.
Wall thicknesses vary according to the material used.
range from approximately 0.020" to 0.030" The metals thick, while the ceramics are all approximately 0.10"(0.51 to 0.76 mm) thick.
The main structural difference between these models is(2.54 mm) that the 758 uses stainless steel for its midsection while the 761 and 762 use Kovar.
The 758 is approximately 5.5"Another' difference of note is physical size.
(2.54 cm) in diameter, the 761 is appr(oximately 4.7"14 cm) in length by 1" length by 1" (2.54 cm) in diameter, and the 762 is app (roximately 12 cm) in 5" (14 cm) in length by 2" (5.1 cm) in diameter.
a
1 I
4 REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE HQt:
NR-316-D-101-5 DAIE: July 14, 1992 PACE 3 or 7 DEVICE TYPE:
Neutron Generator DESCRIPTION: (Cont'd)
The neutron generators are designed to be placed inside of a metal high voltage assembly.
For the Models 758 and 761 this assembly consists of a long, cylindrical, sealed tube approximately 1.68" (4.3 cm) in diameter and 84" (2.13 m) long.
The tool assembly for the 762 is larger in diameter and measures approximately 30" (76 cm) in length.
The assemblies are constructed of metal, are completely sealed, provide additional protection from damage to the capsule and would contain any tritium gas if the generator capsule should break and/or leak.
The assembly used with the Models 758 and 761 is designed for use in well logging applications.
The assembly used with the Model 762 is designed for use in devices which perform 'lemental e
analysis of bulk material in non-well logging applications.
LABELING:
The external surface of each neutron generator target is engraved with a target assembly I.D. number consisting of year-month-day (date of construction) and target position and the sequential serial number assigned to the neutron generator.
After tritiation, the neutron generators have the model number (758, 761, or 762) and " Radioactive H3" etched or engraved on the annulus of the end Kovar piece ht the pinchoff and.
The remaining annular space is taken by a second engraving of the serial number.
DIAGRAMS:
See Attachments 1 and 2.
CONDITIONS OF NORMAL USE:
These neutron generators may be used in well logging applications and in devices which perform elemental analysis of bulk material such as in airports and laboratories.
would present the most hazardous environment.Well logging applications Therefore, the generators are designed to withstand this type of environment.
O
q*
k REGISTRY OF T<ADICACTIVE SEALED SOURCES AND DEVICES
~
'iATETY EVALUATION OF DEVICE EQ4:
NR-316-D-101-5 D&IE: July 14, 1992 PACE 4 OF 7 DEVICE TYPE:
Neutron Generator CONDITIONS OF NORMAL USE: (Cont'd)
The capsules are designed for the following operating conditions:
- Operating temperature: -4 *F to 325'F (-20*C to 163 *C) with brief excursions of -67'F to 392'F (-55*C to 200*C) allowed for one hour or less.
- Thermal cycling (non-operating) of 50*F/ min (10*C/ min) with half-hour dwell limits of 32 *F and 437'F (O'c and 225'C).
- Up to a 100 g shock of 8 millisecond duration along the revolution axis and any perpendicular axis.,
- Sinusoidal vibration up to 7.5 g from 10 Hz to 18 Hz, except limited to 0.5" along the revolution axis and any perpendicular axis.(1.27 cm) double a
- Mechanical strength: Up to 80 psi (552 kPa) in tension.
e Storage temperature between -67*F to 122*F (-55'c to 50'C).
Operation of the generator at voltages in excess of the Also, at temperatures above 1832*F (1000*C) desorption of theop tritium will occur.
If the integrity of the sealed envelope is breached at this temperature, leakage of tritium gas may result.
PROTOTYPE TESTING:
A fully operational Model 758 generator was tested for' resistance to 550 g for durations of 11.5 as to 3.4 as respectively.to multi maximum expected shock during normal handling and'use is 100 g.
The The generator was initially tested with partial power applied.
Following the test, full power was applied and the unit operated normally.
The unit was ratested with full power applied.
showed that the unit performed normally.Following the second series Normal operation of the been breached. unit is an indication that the integrity of the capsule has not i
w 4
\\
REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES
~
SAFETY EVALUATION OF DEVICE EQA:
NR-316-D-lol-S Q&IE: July 14, 1992 PAGE 5 oF 7 DEVICE TYPE:
Neutron Generator ERQTDT12JlL2ESTING: (Cont'd)
The manufacturer states that the Nodel 758 has been in use since 1985 with minimal reported failures or breakages and the Model 761 has been in use since 1988 with no reported failures or breakages.-
shown to have an approximate " working life" of three years unde normal conditions of use.
governed by operational efficiency.The " working life" of the unit is M ERNAL RADIATION LEVFTA:
The generator only produces neutron radiation when high voltage is applied.
In the " power off" condition, no neutron radiation will be produced; however, gamma radiation may be present as a result of neutron interaction with the components of the generator itself and the high voltage assembly.
The majority of the gamma radiation produced is due to activated aluminum, copper and iron with short half lives (less than lo minute half life for the copper target and aluminum in the ceramic envelope components and less than 15 hour1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> half life for the copper and aluminum components of the generator and the iron components of the assembly).
not contribute significantly to the radioactive output. Longer-lived activation prod hour after the units were shut off following three hours ofradiatio The continuous operation.
Three hours is a t for the units to be turned on during use.ypical period of time FTAPSED TIME lo min./N 8227 S/N 8299 S
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> lo min.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> DISTANCE Radiation Levels (aren/hr [pSv/hr))
5 cm 3.4 [34.o) 1.2 [12.o) 4.o (4o.o) 1.o (lo.o) 30 cm o.3
[3.0) 0.1
[1.o]
o.2s [2.s) o.o9 [o.9) 100 cm o.o8 to.8) 0.o2 to.2) 0.o2 [o.2) 0.o2 to.2)
Typically, surface gamma radiation levels will fall below.2 aram/hr [2o pSv/hr) within twenty four hours after use.
s.
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE 322:
NR-316-D-101-8 Q&IE: July 14, 1992 PAGE 6 OF 7 DEVICE TYPE:
Neutron Generator OUALTTY AEEURANCE AsD COivrnOL:
Tr.= manufacturer claims to maintain a Quality plan that meets the following MILITARY STANDARDS:
MIL-Q-9858 " Quality Program Requirements"; MIL-I-45208A " Inspection System Requirements"; and MIL-STD-45662 " Calibration System Requirements".
All neutron generators are 100% tested for conformance to specifications, and the end product must meet the internal standards of an ultra-high vacuum device.
Additionally, material procurement checks in-process assembly inspections and performance testing ar,e performed and documented under the manufacturer's Quality Plan.
LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:
The Models 758, 761 and 762 neutron generators shall be distributed only to persons specifically licensed by the NRC or an Agreement State.
i Handling, Storage, Use, Transfer, and Disposal:
determined by the licensing authority.
In view that these To be generators produce high levels of neutron radiation when activated, they should be handled only by experienced personnel using adequate remote handling equipment and procedures.
This registration sheet and the information contair.ed with the references shall not be changed without the wrhtten consent of the NRC.
The generators shall not be subjected to' environmental and conditions specified in the users manual and in theuse condit
" Conditions of Normal Use " section above.
REVIEWER NOTE:
The generators are exempt from leak testing requirements.
However a significant reduction in the operational efficiency,of the unit may indicate leakage of the source.
be taken out of service and tested for leakage usingA device techniques capable of detecting the presence of tritium.
dealing with this possibility.The licensee should develop proced
y --
y
.. y
. ~
I
/
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE h:
NR-316-D-101-S DA22: July 14, 1992 PACE 7 OF 7 DEVICE TYPE:
Neutron Generator SAFETY ANALYSIS
SUMMARY
Based on our review of the information and test data cited below and the past use history of the Models 758 and 761, that the Models 758, we conclude 762 and 762 neutron generators are acceptable for licensing purposes.
Furthermore, we conclude that these neutron generators would be use which might occur during the uses specified in thisexpected to m registration sheet.
REFERENCES:
The following supporting documents for the Models 758, 762 neutron generators are hereby incorporated by reference and 761 and are made a part of this registry document:
- EMR Photoelectric's letters dated July 16, 1991, July 17, 1991, September 5, 1991, January 13, 1992, and January 15, 1992 with enclosures thereto.
ISSUING AGENCY:
U.S. Nuclear Regulatory Commission Date:
July 14. 1992 Reviewer:
w Date:
July 14. 1992 Concurrence:
Me 9
0 s
e m
K" u
RECISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES i
SAFETY EVALUATION OF DEVICE E9.:
NR-316-D-101-8 DATE: July 14, 1992 ATTACHMENT 1 DEVICE TYPE:
Neutron Generator SS APPROX.
STAINLESS KDVAR -
KDVAR}-
---)(DVA@ TIG WELD-STEEL COPPER TIG VELD CERAMIC -
l RAZE TO KOVARF
- PRDIECTIVE.01 PINCH-OFF CAP - SDLDERED l.0* DIA. APPRDX.
MODEL 758 m==aan a utanumrum m 7m uma g
et t -;
}
..f.
_.g
\\
W
)
,.l ks k
l i
cr (5
y i
a"
L
.L = :: -
REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE EL:
NR-316-D-101-S DATE: July 14, 1992 ATTACHMENT 2 DEVICE TYPE:
Neutron Generator w enos.
s wass sita owoca same arm "u!!OiS'au
~
l'~
~
/
/
I L
1
/
}
J j
y l
7 s
\\
l I
me sum mi sta utmmt nur mon NEUTRON GENERATOR lilGH VOLTAGE ASSEuBLY FOR GENERAL NEUTRON SOURCE APPtlCATIONS.
O O
I
- - - - - - -