ML20216B017

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Registry of Radioactive Sealed Sources & Devices,Safety Evaluation of Device for Model 4493-97. Certificate:NR-8003-S-821-S
ML20216B017
Person / Time
Issue date: 06/29/1993
From: Doug Broaddus, John Lubinski
NRC
To:
Shared Package
ML20216B022 List:
References
SSD, NUDOCS 9805150011
Download: ML20216B017 (8)
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Text

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE I

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NR-8003-S-821-S DATE:

June 29, 1993 PAGE 1 OF 6 I

DEVICE TYPE:

Scanner Flask I

MODEL:

4493-97 MANUFACTURER / DISTRIBUTOR:

Atomic Energy of Canada, Ltd.

(AECL) 413 March Road P.O.

Box 13500 Kanata, Ontario, Canada K2K 1B7 SEALED SOURCE MODEL DESIGNATION:

Amersham Corporation Model No. CDC.PE3 1SOTOPE:

MAXIMUM ACTIVITY:

Cesium-137 20 curies (740 GBq)

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Depleted Uranium 100.3 lbs (45.5 kg)

LEAK TEST FREOUENCY:

6 months PRINCIPAL USE: (D) Gamma Gauge CUSTOM DEVICE:

X YES HO CUSTOM USER:

Atomic Energy of Canada Limited Process Analysis Services P.O. Pox / C.P.

13500 Kanata, Ontario, Canada K2K 1X8 t

i 9005150011 930629 PDR RC D

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE i

HQ2:

NR-8003-S-821-S DATE:

June 29, 1993 PAGE 2 OF 6 QE' ICE TYPE:

Scanner Flask DESCRIPTION:

The device is constructed of a depleted uranium sphere 6.25" (15.88 cm) in diameter, weighing approximately 45.5 kilograms

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(100.3 lb) and encased in a stainless steel cylinder. The I

cylinder has a thickness of 0.28" (0.71 cm).

The source is held in the device by a removal plug of depleted uranium encapsulated in stainless steel.

The plug can be rotated to move the source from the " safe" or " transportation" position to the "open or window" position.

Once positioned, the plug is held in that position by a stainless steel bolt.

A tapered window, located on the side of the device, allows for insertion of a cepleted uranium plug to provide additional shielding during transportation.

The depleted uranium plug is replaced with a collimator plug at the time of use.

The removal and insertion of the plugs is accomplished by the use of a special tool.

This tool limits the radiation exposure to the users' hands.

Steel guide cables are used to hold a scintillation detector on one side of the column or tower to be scanned and the scanner flask on the side directly opposite the detector.

Both the detector and flask are moved up and down the guide cables by a cable connected to synchronized hoist motors.

Thus, both units move up and down the column or tower at the same time and location.

The scanner flask is the source holder assembly for the AECL Gamma Scanning System.

LABELING:

The outer stainless steel casing is stamped with the words

" CAUTION-RADIOACTIVE MATERIAL".

Two labels are affixed to the device.

The first label contains the wording " RADIOACTIVE MATERIAL AECL-CRNL".

The second label consists of "Cs-137", the activity and date of assay.

DIAGRAM:

See Attachments 1 and 2.

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES 1

SAFETY EVALUATION OF DEVICE EQ2:

NR-8003-S-821-S DATE:

June 29, 1993 PAGE 3 OF 6 DEVICE TYPE:

Scanner Flask CONDITIONS OF NORMAL USE:

The device is used to scan chemical or petroleum columns or towers where gases and liquids come in contact.

The device is used in ambient environmental conditions and in temperature ranges of -40'F to 122'F (-40*C to 50'C).

The device has been used to scar towers 300 feet (91.4 m) abcVe ground level.

PROTOTYPE TESTING:

The Amersham Corporation sealed source Model No. CDC.PE3 has been tested in accordance with ANSI N542-1977 requirements.

The source achieved a classification of 77E63535.

Since this is a custom device, the manufacturer did not test the unit.

However, through engineering analysis, they estimated the ANSI N538 classification of the device to be 24-885-885-23.

Additionally, the manufacturer stated that the device had been used in Canada for three years without any report of loss of containment integrity.

During the three year operational period, one incident was reported.

The cable used to raise and lower the scanner flask broke.

The safety cable lock assembly stopped the l

fall of the scanner flask within one foot of the break.

This incident did not result in a release of radioactive material nor did the device lose containment integrity.

EXTERNAL RADIATION LEVELS:

1 The manufacturer reported the following maximum dose rates for the device containing 20 curies of Cesium-137:

Source in " safe" position with plug in beam path Distance Dose Rate

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5 cm/1.97" 15 mrem /hr (150 pSv/hr) 30 cm/11.8" 7 mrem /hr (70 ySv/hr) 100 cm/39.4" 1 mrem /hr (10 pSv/hr) 1 i

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE EQz:

NR-8003-S-821-S DATE:

June 29, 1993 PAGE 4 OF 6 DEVICE TYPE:

Scanner Flask EXTERNAL RADIATION LEVELS: (Cont'd)

Source in the "open" position with collimator plug in beam path Distance Dose Rate 5 cm/i 97" 7 mrem /hr (70 pSv/hr) 30 cm/11.8" 2 mrem /hr (20 pSv/hr) 100 cm/39.4" 0.5 mrem /hr (5 pSv/hr)

Dose rates in beam path Distence Dose Rate 5 cm/1.97" 270 R/hr (2.7 Sv/hr) 30 cm/11.8" 60 R/hr (600 mSv/hr) 100 cm/39.4" 7 R/hr (70 mSv/hr)

OUALITY ASSURANCE AND CONTROL:

Since this is a custom device, the unit was constructed under the supervision of a mechanical engineer and in accordance with t

manufacturer's specifications.

AECL submitted a quality assurance and control program which was j

deemed acceptable for licensing purposes by NRC (formerly AEC).

A copy of the prcgram is on file with the Source containment and Devices Branch.

LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:

  • This device shall only be distributed to and used by the custom user listed on the first page of this certificate.
  • The device shall be leak tested at intervals not to exceed six months using techniques capable of detecting 0.005 microcuries (185 Bq) of removable contamination.

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE i

hot:

NR-8003-S-821-S DATE:

June 29, 1993 PAGE 5 OF 6 DEVICE TYPEL Scanner Flask LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USP: (Cont'd) 2 Thndling, storage, use, transfer, and disposal: To be o=Lermined by the licensing authority.

In view that the sealed source exhibits high surface dose rates when unshielded, these sealed sources should be handled only by experienced licensed personnel using adequate remote handling equipment and procedures.

This device exhibits high radiation dose rates in the beam

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e field.

The license reviewer should insure that AECL has adequate safety measures to institute and enforce restricted I

access areas around the scanning equipment.

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  • This registration sheet and the information contained within the references shall not be changed without the written consent of the NRC.

FAFETY ANALYSIS

SUMMARY

The Model 4493-97 scanner flask is a custom device and manufactured by Atomic Energy of Canada Limited for use by their personnel to I

provide a service to American chemical and petroleum industries.

l The sealed source used in the device is manufactured by Amersham Corporation and is their Model No. CDC.PE3 and has received an ANSI N542-1977 classification of 77E63535.

The manufacturer claimed that the device was used in Canada for three years without any report of loss of containment integrity.

The increase in sealed source activity from 2 curies to the present 20 curies required the slight modification of the source holder.

This modification did not affect the overall integrity of the scanner flask.

Based on the above considerations and our review of the information and test data contained in the referenced cited below, we continue to conclude that the Model 4493-97 scanner flask is acceptable for custom licensing to Atomic Energy of Canada Limited.

However, this device is no longer used by the custom user and is not a current product manufactured by AECL.

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i REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES j

SAFETY EVALUATION OF DEVICE j

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NR-8003-S-821-S DATE:

June 29, 1993 EbGE 6 OF 6 j

l DEVICE TYPE Scanner Flask

REFERENCES:

The following supporting documents for the AECL Model 4493-97. device are-hereby incorporated by reference and are made a part of this registry document:

  • Atomic Energy of Canada Limited, Process Analysis Services application hand delivered April 20, 1983 and letters dated May 10, 1983 and July 29, 1983.

e Nordion International, Inc. letters dated June 25, 1993, March 16, 1992, December 5, 1991, November 18, 1991, and October 3,

1988, with enclcsures thereto.

ISSUING AGENCY:

U.S.

Nuclear Regulatory Commission Date:

June 29, 1993 Reviewer:

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DougT,As A. Broaddus N

Date:

June 29, 1993 Concurrence:

Jop W.

Lubinski i

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE 1

1 No,; NR-8003-S-821-S DATE:

June 29, 1993 ATTACHMENT 1 Source plug can be turned to move source fras " safe" position to "open" position:

arrow indicates location of source.

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U REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE F_O,_i NR-8003-S-821-S DATE:

June 29, 199'.s ATTACHMENT 2 Q

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