ML20137W377
| ML20137W377 | |
| Person / Time | |
|---|---|
| Site: | 07000391 |
| Issue date: | 09/20/1985 |
| From: | Faust J PRINCETON UNIV., PRINCETON, NJ |
| To: | Glenn J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20137W321 | List: |
| References | |
| 03276, 3276, NUDOCS 8512100233 | |
| Download: ML20137W377 (7) | |
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4 Princeton University omcc or occupational Health & sarery James Forrestal Campus Princeton, New Jersey 08544 609-452-5294 Re:
License No. SNM-356 September 20, 1985 Docket No. 070-00391 Control No. 03276 John E.
Glenn, Ph.D.
Chief, Nuclear Materials Safety Section B Division of Radiation Safety Safeguards k
U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406
Dear Dr. Glenn:
This is in response to your letter of June 26, 1985, regarding our request for renewal of license number SNM-356.
The additional in-formation you requested follows:
1.
The following criteria are used to determine the frequency at which individual investigators are required to perform surveys.
a.
Personal and work area contamination surveys are required at the end of an experimental procedure and at the end of the day for multi-day procedures.
b.
Personal and work area contamination surveys are required during the manipulating of millicurie quantities of open sources.
Because of the diversity of the radioactive materials and the experimental procedures performed in research activities at the University, the frequency and the timing ~of this type of survey is best left to the judgment of the individual performing the experiment.
c.
Personal and work area contamination surveys are required during and following the opening of radioactive materials packages.
d.
Personal and work area contamination surveys are required following withdrawals from stock solution vials conta ning millicurie quantities.
e.
Personal contamination surveys are required prior to exiting the restricted area.
In developing the above criteri4 the recommendations in Regulatory Guide 8.23 - Radiation Safety Surveys at Medical, Institutions -
were adapted to the academic environmeEt.C C> M
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letter,:
John E.
Glenn, Ph.D.
page 2 NRC - RegionI' 9/20/85
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Re:
License No.kSNM-356 a
Decontamination is re uired when removable surface contamination equals or exceeds the limits recommended in, Table II of Regulatory Guide 8.23.
Sections 10.D and 10.E of the Radiation Safety Guide will be revised to reflect the above.
2.
Our criteria are stated in Section ll.B of the Radiation Safety Guide.
"1 As a matter of practice, whole body personal monitors are provided to individuals who use or are exposed to sources of neutrons, photons and/or beta radiation sufficient to be measured by the personal dosimeter.
Additionally, individuals who actually manip-ulate these sources are provided with TLD ring badges and/or wrist badges.
Specifically, individuals who manipulate millicurie quan-tities of P-32 and I-125 are issued andyrequired to wear finger dosimeters.
Section ll.B of the Radiation SafetyJGuide will be revised to include the requirement that finger dosimeters be worn when manipulating millicurie quantities of P-32, I-125 or other sources that may cause significant hand exposure.
3.
It is confirmed that all individuals, including post-doctoral research staff, will receive initial and annual refresher train-ing in accordance with the requirements in 10 'CFR 19.12.
The ap-plicable sections of draft Regulatory Guide, Task OP 212-4,
" Radiation Protection Training for Personnel Employed in Medical Facilities", are being used as a model for this training.
It provides guidance for documentation and training session content.
While radiation safety training provided by the Health Physics Staff for radiation workers is in place, other training sessions for ancillary personnel are being improved or developed.
This effort is in progress and will be completed no later than December 31, 1985.
Section 6.I of the Radiation Safety Guide will be changed to reflect the above.
4.
The Health Physics Staff have calibrated radiation measuring in-struments since the inception of the SNM License.
The information you request follows:
Quantity a& b)
Manufacturer's as of Serial #
Model #
Nuclide 9/1/85 M-742 N/A*
Pu-239 1 Ci M-941 N/A*
Pu-239 1 Ci
- Sources manufactured by Monsanto Chemical Company - Mound Laboratory, Miamisburg, Ohio
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.letterj. John E. Glenn,-Ph'.D.
page 3 1~
' NRC -. Region I
~9/20/85 Re:' Lic'ense"No. SNM-356 f
l c) LThe above: sources'have.been calibrated by the National Bureau' of. Standards '(NBS) Jor have calibrations traceable to:the NBS. 1The calibration information is on file &t
'the' Office of Occupational Health and Safety.
c
-d) i The.following are:.the step by step procedures, including,
'tdun associated radiation safety procedures used during the.
calibration of our exposure rate. measuring. instruments.
- The-applicdble sections of ANSI N323-1978..were followed in developing these. calibration procedures.
Precalibration. Test #.ng of Instrument
. A _ precalibration test is performed to assune that operating
- requirements. specified by the instrument manufacturer are met.
.The rfollowing tests constitute precalibration:
~
11). 'The. instrument is determined to be free of radioactive contamination.
2)
The batteryLcomplement is checked for proper type, condition, and output.-
- 3) 1The meter is' turned-on and allowed to stabilize.
4)
Range ' switches and meter readout are checked for
. proper-functioning.-
5)
Electronic adjustments are set to manufacturer's
- specifications.
6)
The zero is adjusted.
The control is checked for proper functioning. ' The-zero reading is observed - watch
'for' excessive drift or instability.
7)
Unusual ~ switching transients are noted.
8)..The response time'is checked.
9)
,If1the instrument fails any of the above tests in steps 7
1 through 8, terminate the calibration and refer' the
] problem to tdun Health Physicist.
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O letter: ' John E.
Glenn, Ph.D.
page 4 NRC - Region I 9/20/85 i
Re:
License No. SNM-356 Calibration Tools The following items are needed to. calibrate neutron survey instruments:
1)
A neutron source of a known dose rate.
This_is a.
source' calibrated by NBS or a calibrated source traceable to NBS.
2)
An instrument calibration assembly to accurately measure the distance from the center of the source to the center
~
of the chamber and to assure that positioning errors are minimized.
3)
Tools for making adjustments.
4)
An accurate timing device or time indicator to calibrate integrating _ instruments.
5)
The appropriate instruction manuals..
Calibration Set Up Set up instrument on the calibration table.
The neutron survey instrument-is calibrated in the same orientation as
'that used in the field.
The neutron detector is positioned a known distance from the neutron source.
The distances are center to center.
The moderating sphere of the neutron detector is placed on the end of the table to minimize scattering.
The neutron source is placed on a tripod.
This operation is performed in the center of the calibration facility to minimize scattering.
PRIMARY CALIBRATION Reproducibility Test The survey instrument is tested at a dose rate value that occurs at the mid-point on each scale of interest.
The in-strument is _ exposed three or more times under identical con-ditions on each range of interest.
The reading on each scale shall not vary by more tha'n 10 percent (E 0.10 E).
This test is performed prior to making calibration adjustments.
The calibration data generated from all the tests are recorded on a calibration data sheet, ' OHS Form # 87 (see attached).
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~ letters. John:E. Glenn, Ph'.D.
page 5
_NRC
' Region._I
'9/20/85 Re:
License No.:SNM-356-d l
Rea out Sca e &-Linearity-Calibration & Adjustment-
- If controls.-are provided
- for each' scale, adjustment of each Eshall be madefaccording to-the manufacturer's specifications or at the mid-point'of.each scale.
If.only one control is
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provided, adjustments.shall be made either:
'l) _ At.the, point specified by the manufacturer.
- -y -
2)
Near the mid-point of the middle scale.
3)
Near the mid-point of the scale that is particularly important to our requirements.
- After;this adjustment, the calibration shall be checked near
'the ends,of each scale (approximately 20 percent'and 80 per-
- cent of full scale).
After an adjustment or adjustments have f
been-completed,finstrument readings must be within 10 per-
-cent'of known radiation values at these two points.- However, readings within' 201 percent shall~be acceptable if.a cali-bration chart or graph (containing correction factors) is prepared ~ and made available.with the instrument.
A neutron survey instrument with integration capabilities.is
-calibrated by exposin'g.the detector to a known amount of-
_ neutrons within accurately. measured time periods.
TEhe count at'the'endLof the timing period is normalized to a neutron
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dose. ' The' timer is electronic and-integral with the instru-
< ment.
Calibration Frequency Pre-and primary calibration is performed nominally at six
. month' intervals.
Radiation Safety Considerations a
-The sources.used for calibration are one Curie PuBe sources 9:
andidofnot'present~an immediate danger to-the calibrator..The calibrator minimizes his exposure by working as efficiently as possible and at. sufficient distances to " limit his exposure.
Sources are1 manipulated with handling ~ tools. ' Ring, wrist and Lbody. dosimeters are, worn by the calibrator during the entire process.
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Q) letter:. John E.
Glenn, Ph.D.
page 6 NRC - Region I 9/20/85 Re:
License No. SNM-356 I
We trust that the information provided above meets your needs and that you can now proceed to review our renewal application for the subject. license.
-We are in the process of making the revisions to our Radiation Safety Guide; the commitments made above will be re-flected in that revision.
Changes to the Radiation Safety Guide-
.will,-as in the past, be forwarded to you as soon as they have been completed. ~Thank you for your cooperation.
Very truly yours, M8 4 Lee Jack C.
Faust Director JCF:lt
.cc:
Radiation Safety Committee Committee On Occupational Safety and. Health file 9.2
Attachment:
OHS Form #87 O
PRINCETON UNIVERSITY - 0FFICE OF OCCUPATIONAL ITAI!Ill G SAFETY o
CALIBRATION DATA SIIEIrr PQJIPbENT DATE TBIPERK11JRE i
SDDEL TIME 1RNIDITY MANUFACTURER CALIBRATION FACILITY ADOSPIERIC PRESSURE SERIAL NO.
CALIBRA'IDR AIR DENSITY CORRECTION FACIOR DEPARDIENT CALIBRATION GEGIETRY
% ERROR SOURCE DISTANCE DOSE RATE SCALE READING
% ERROR REPRODUCIBILITY TEST PRECALIBRATION GECK LIST:
FIEE OF CONTAMINATION O BATTERY OIECK O 1h'0 MIhUTE STABILIZATION O RANGE SWI'IUIES 6 READ OUT O ELECTRONIC ADJUSDIENTS O ZERO ADJUST O SWITQlING TRANSIENT GECK O RESPONSE TIME O RECORD A.P. TBIP IRNIDITY 0I163 Fcnn #87 (Rev.10/84) (front)