ML20058G581
| ML20058G581 | |
| Person / Time | |
|---|---|
| Site: | 07109024 |
| Issue date: | 11/09/1990 |
| From: | Osaden E ST. LOUIS TESTING LABORATORIES, INC. |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9011130291 | |
| Download: ML20058G581 (8) | |
Text
714A
)
Chemical, Metallurgical, Mechanical Nondestructive, Environmental Testing, Analyses and Field Service.
I November 9, 1990 1
U.
S. Nuclear Regulatory Commission ATTN: Mr. Charles E. MacDonald, Chief Transportation Branch Division of Safeguards and Transportation, NMSS Washington, D.C.
20555 Attachments:
1.
Operating Procedures on Model No. STL-201 Package II.
Maintenance Program on Model No. STL-201 Package III.
Maintenance Program on Model No. STL-100 IR Exposure Device
Dear Sir:
This is in reference to your letter dated October 12, 1990 requesting a revision to our Certficate of Compliance No. 9024, for the Model No. STL-201 package.
^y your request I am submitting:
1.
a list of operating procedures presented sequentially in order in which the operations are performed.
The procedures also address inspection prior to
- loading, notes'on package handling, installation of security seals and labels, determination of external radiation per regulatory
- limits, 2.
a list of procedure instructions pertinent to receiving and unloading the package and limits on package content and 3.
the maintenance program describing checks on labels and cannister's damage, quarterly inspection of cannister annually, semi-annually leak test inspection of cannister.
4.
and set up of inspection and maintenance on Model STL-100 IR Exposure Device.
I hope the information provided is satisfactory.
Sincerely, f
wh k
Ed Osaden/
Radiation Safety Officer EO/cif 9011130291 901109 PDR ADOCK 07109024 C
PDC 2810 Clark Avenue
- St. Louis, MO 63103-2574 * (314) 531-8080
- FAX (314) 5318085 l
1 I.
OPERATING PROCEDURES ON MODEL NO. STL-201 PACKAGE A.
When used by radiographers in the field:
- 1. Visually determine cannister is not damaged (dents, holes, etc.)
- 2. Check all labels, must be visible:
r
- a. (2) each: Caution - Radioactive Material b.
(2) each: Department of Transportation Type D labels showing company's name, model number, serial number and weight.
- 3. After ascertaining the source is in a shielded position (per radiographer's manual pg. 82) and exposure device is locked, insert exposure device in -
cannister and lid together, secure locking ring with a lock.
4.
Determine, by the amount of radiation at the surface and at one meter from cannister, what Department of Transportation stickers (quantity 2) to be used:
category I-white (10.5 mR at surface and 0 mR 1 meter), category II-yellow (2 50mR at surface and 2 1.0 mR at 1 meter), category III-yellow (> 200mR at surface and 1 10 mR at 1 meter).
5.
Place cannister in vehicle.
6.
Fasten cannister securely to vehicle.
- 7. After completing the job return exposure device to cannister, secure and lock safety ring.
- 8. Check radiation level at the surface and at (1) meter from cannister and fasten cannister to vehicle.
- 9. After returning back to the lab and before unlocking cannister, check radiation level again making sure radiation level is the same as the original reading.
- 10. Unlock safety ring, take off lid, take exposure device out and place it in the vault.
- 13. Put lid back on cannister, safety ring (unlocked) around it, return cannister assembly to storage area.
t
I.
B. When returning an old source to the manufacturer:
1.
Visually determine cannister is not damaged (dents, holes, etc.)
2.
Check all labels, must be legible:
a.
(2) each: Caution-Radioactive Material b.
(2) each Department of Transportation Type B labels showing company's name, model number, serial number, and weight.
3.
With a leak tester check surface of exposure device dnd internal surface of cannister for any Contamination (readings should not exceed.005 m curies).
If readings exceed.001 m curies initiate emergency procedures at once.
4.
Place camera locking device in the exposure device and lock it with a tamper proof security seal.
5.
Insert exposure device in cannister, place lid on top of cannister, place locking ring sealing cannister and lid together, secure locking ring with a tamper proof security seal.
6.
Determine, by the amount of radiation at the surface and at one meter from the cannister, what Department of Transportation stickers (quantity 2)-
to be used:
category I-white (2
0.5 mR at surface and 0 mR at one meter),
category II-yellow (1 50 mR at surface and 2
4 1.0 mR at one meter),
category III-yellow (1 200 mR at surface and 1 10 mR at one meter).
7.
Make sure all Department of Transportation signs are on the cannister:
i a.
Air Cargo Only (2) b.
UN or ID number c.
Type of package d.
Certificate number Make out shipping papers per shipping company and Department of Transportation Regulations and send cannister to company that will replace your old m urce with a new one.
~
8.
When cannister with new source returns to you, check for any damages, check radiation level at surface and at one meter.
Open cannister, remove exposure device, unlock it and do a leak test on exposure device surfaces and i
interior of cannister.
Leak test readings should not l
exceed.005 m curies.
If they do, initiate emergency procedures at once. If not, secure exposure device with lock.-
Replace lid and locking ring (unlocked) on cannister and return it to storage area.
C. When returning an empty exposure device to manufacturer:
1.
Follow same procedure as in part I.
B.
D. Model No. STL-201 package is made to house an exposure device which contains no more than 100 curies of IR 192.
a l
1
II.
MAINTENANCE PROGRAM ON MODEL NO. STL-201 PACKAGE 1.
Daily check to make sure all labels are visible and there is no damage to cannister.
2.
Quarterly inspection of cannister assembly:
a.
Check cannister b.
Check lid c.
Check locking ring d.
Check wooden block inside of cannister e.
Check labels 3.
Anything found defective in stop (1) and 11 be cither fixed or replaced.
4.
Semi-annually leak test inspection of
.de of cannister.
III.
MAINTENANCE PROGRAM ON MODEL STL-100 IR 1.
Periodic inspection of STL-100 IR can be found in STL -
Radiographer's Manual, page 84 through page 86.
Upon completion of the exposure, the tource is rapidly retracted to the "off" or " shielded" position.
'the radio-grapher will immediately make a survey with e sarvey meter to establish that the source has been returned to the expo-sure device and is in the "off" or ' shielded" position.
This is accomplished by first approaching the exposure end of the exit conduit and monitoring the entire lensth of the conduit and then monitoring the exposure device.
If additional exposures are to be made in nearby areas the drive cable locking device may be used to insure that the source is not removed from the storage position.
prior to securing the exposure device, the device will be surveyed with a survey meter to insure that the source is in the " shielded" or "off" position, after which the results will be recorded and the record maintained for inspection by the Commission.
Inspection and Haintenance of the Model STL-100-Ir Exposure Device Following are the procedures to be used for inspection and maintenance of the STL-100-Ir device.
The following sequential numbers correspond to the numbers in the ill,ustration of the device (Figure 2).
1.
CASE The case and exterior appurtenances shall be examined visually for cracks, dents, damaged threads, distortion and foreign material such as mud.
2.
SOURCE SHIELDING An examination of the unit shall be made by checking the locking cable and its ball stop for free movement to the locked and unlocked position.
3.
SOURCE POSITIONING HECHANISH TOR BEAM EXpOSUPE This item shall be examined visually for damage by attaching its cable connector to the disconnect yoke of the pigtail to check for proper fit.
A snug fit is desirable.
4.
SOURCE POSITIONING CONTROL HECHANISH FOR EXTERNAL EXp0SURES This unit consists of an aluminum housing, a cover plate screwed with four screws, an 80-tooth hobbed wheel with mating serrated shaft and a crank.
The unit shall be checked visually for damace and operated by the crank to make sure it functions freely and smoothly.
_a page 84
s' NOTE:
At the eucrtarly inspections the cover plate shall be removed and the unit inspected for defects cnd excessive wear, and cleaned and olled as required.
Use only non-corrosive lubricant, and one that will not impair operation of the unit under adverse temperature conditions.
5.
CAMER6_ LOCKING _pBVICE This device chall be inspected visually for cleanliness, damage and for proper position-ing.
6.
QLIVE CABLE LOCKING DEVICE This device shall be visually inspected for damage and operated to insure that it functions properly.
7.
COND_UIT - SOURCE EXIT The source exit conduit shall be j
inspected visually over its entire exterior surface area for dents or damaged areas.
The drive cable shall be cranked into the exit conduit if there is any doubt as to whether or not the conduit has been dented or crushed rendering it unusable.
The stop at the end of the exit tube and the quick dis-connect at the opposite end shall be checked by twisting and pulling b9 hand to insure that they are swaged tightly to the conduit.
8.
CONDUIT - DRIVE CABLE The drive cable conduit shall be checked for free and smooth operation by cranking the.dlive cable back and forth.
Fittings at each end of this conduit shall be checked for tightness.
9.
CONDUIT - DRIVE CABLE STORAGE This conduit shall be checked for proper functioning by cranking the drive cable back and forth.
Fittings at each end of this conduit shall be checked for tightness.
- 10. SOURCE HOLDER Inspection of the source holder 1s not
- feasible, page 85
l l
- 31. RALL_0 TOP The correct locotion of the ball stop on the pictail is indicated by the length of the disconnect yoke (Tigure 2-12) of the plata11 protrudina (0.5*) out of the i
male disconnnect fitting at the back end of the device.
If the disconnect yoke protrudes more than 0.75",
a radia-tion survey shall be made to insure that the radiation level at the surface of the device is less than 150 mr/hr.
- 12. DISCONNECT YOKE This fitting shall be visually inspected and checked with a drive cable connector for proper fit.
A snug fit is desirable.
- 13. DBIVE CAght The drive cable is subject to wear and flexina as it goes around the hobbed wheel in the aluminum housing.
l Hake a visual incoection of a two or three foot section for cleanliness, wear aid damage by cranking it out of the con-duit.
If cranking the cable back and forth in the conduit is difficult, the entire control mechanism and cable shall be taken apart, inspected, cleaned and oiled.
NOTE:
The quarterly inspection of the drive cable shall be inspected for wear or damage. cleaned and oiled.
!1
- 14. DRIVE CABLE CONNECTOR A visual examination shall be made of the drive cable connector for distortion and wear.
It shall-function smoothly when mated with the disconnect yoke of the: pigtail.
A snug fit is desirable.
- 15. QUICK DISCONNECTS Each quick disconnect shall be visually inspected for cleanliness, distortion, damage'and checked
.to insure that it will engage into the proper position.
- 16. EJPOSURE'SILECTOR The exposure selector shall be visually i
inspected for cleanliness, distortion, damage, and checked oto insure that it will screw into the proper position.
1 l
l' 2
page 86 l-i i