ML20207A941

Registry of Radioactive Sealed Sources & Devices,Safety Evaluation of Device for Pipeliner Model 300. Certificate:NR-300-D-871-S

ML20207A941
Person / Time
Issue date:	10/21/1998
From:	Michele Burgess, John Lubinski NRC
To:
Shared Package
ML20207A912	List: ML20207A910 ML20207A924 ML20207A941 ML20207A961
References
SSD, NUDOCS 9905280055
Download: ML20207A941 (21)

Text

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVIL _

NO.- NR-300-D-871-S DATE: OCT 21 1998 PAGE 1 or 5 DEVICE TYPE: Pipewall Thickness Gauge MODEL: Pipeliner Model 300 MANUFACTURER / DISTRIBUTOR: Gamma Industries, Inc.

P.O. Box 2543 Baton Rouge, LA 70821 .

1 SEALED SOURCE MODEL DESIGNATION: Gamma Industries VD(HP) l ISOTOPE: MAXIMUM ACTIVITY:

Cobalt-60 125 mci (4.63 GBq)

Cesium-137 20 Ci (740 GBq) ,

Depleted Uranium Shielding, 11.8 kg (26 lb.)

l LEAK TEST FREQUENCY: 6 Months l

PRINCIPAL USE: (A) Industrial Radiography CUSTOM DEVICE: YES X NO 9905280055 990526 PDR RC SSD PDR is

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1 REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES j SAFETY EVALUATION OF DEVICE I NO.: NR-300-D-871-S DATE: OCT 21 1998 PAGE 2 OF 5 DEVICE TYPE: Pipewall Thickness Gauge DESCRIPTION:

The device is a right circular cylinder, approximately 5-1/2" (13.97 cm) tall and 4-3/4" (12.07 cm) in diameter,'with a lock box attached to one side and consists of a depleted uranium shield enclosed in a stainless steel housing. The housing has two attaching rings, one machined into the surface at the bottom i of the device and one 1 inch from the top. The top and lock box are heliarc (TIG) welded to the device. The cover plate is i aluminum and is bolted to the device using six 1/4 - 20, 1" (2.54 cm) bolts. The cover plate holds in place a tungsten l collimator, which has a 3/16" (4.76 mm) diameter beam port.

The depleted uranium shield is a right circular cylinder with the top taking a hemispherical dome configuration. The shield is 3.842" (9.76 cm) in diameter by 4.156" (10.56 cm) in length. A snap ring holds the source capsule securely into a tungsten insert which has been pressed into a hole centered on the outside edge of a 2.187" (5.55 cm) diameter by 1" (2.54 cm) thick depleted uranium wheel. The source wheel is rotated by a tungsten shaft which is 0.375" (9.53 mm) in diameter at the wheel and 0.5" (1.27 cm) in diameter at the locking mechanism. The wheel is secured to the shaft with a Woodruff key.

The source position is controlled by rotation of the tungsten shaft. In the shielded position the source is 180 degrees from the cover plate and oriented towards the dome part of the depleted uranium shield. A plunger-type lock, which has been modified by the manufacturer for this particular application, is incorporated to lock the source in either the " exposed" or the

" shielded" positions. The tungsten shaft is fitted with a knurled knob which has an arrow engraved to point to the "off" or "on" position. The "off" and "on" positions are stamped into the front of the lock box to indicate when the source is exposed or shielded. The sources can be locked in the "on" position so that while the unit is being operated for pipe inspection, the source will remain in a rigid position with no movement of the source to affect the electronic readout.

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.- NR-300-D-871-S DATE: OCT 21 1993 PAGE 3 OF 5 DEVICE TYPE: Pipewall Thickness Gauge LABELING:

The device bears the manufacturer's name plate which specifies that it contains approximately 26 pounds (11.8 kg) of depleted uranium. The plate also specifies the isotope and the maximum activity permissible. A second plate is attached to the device which specifies the source manufacturer, model number, serial number, activity, and date of calibration. Two other identical labels with the conventional radiation caution symbol state

" Danger, Do Not Handle - Radioactive Material, Notify Gamma Industries, Baton Rouge, Louisiana, or Civil Authorities."

CONDITIONS OF NORMAL USE:

The device is intended primarily as a source holder to be used in l a pipewall thickness gauge. When used in this manner the operator should receive only scatter radiation. The radiation intensity will vary around the inspection machine depending on pipe size, pipe elevation, material thickness, type and distance i of other materials in the area. The only way to determine the l level of scatter radiation is to perform a radiation survey.

After unlocking the device, the source is exposed by manually rotating the control knob 180 degrees clockwise. To secure the  ;

source, the control knob is rotated 180 degrees counterclockwise and the lock plunger depressed. Positive stops are provided for the " exposed" and " shielded" positions.

1 EXTERNAL RADIATION LEVELS:

With a 500 millicurie (18.5 GBq) Cesium-137 source in the shielded position, a survey was performed using a Ludlum Model III G-M. survey meter calibrated against a 100 millicuries (3,7 GBq) Cesium-137 source. With the source in the shielded position, the highest exposure rate at the surface of the device was 5 mr/hr. The manufacturer also supplied a radiation profile which indicated that the maximum exposure rate at 6" (15.24 cm) was 0.9 mr/hr and the maximum exposure rate at 1 m (3.28 ft) was 0.25 mr/hr.

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l REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.- NR-300-D-871-S DATE: OCT 21 199B PAGE 4 OF 5 DEVICE TYPE: Pipewall Thickness Gauge EXTERNAL RADIATION LEVELS (Cont'd).

With a 125 millicurie (4.63 GBq) Cobalt-60 source in the shielded position, a survey was performed using a Victoreen Model 492 survey meter calibrated against a 2000 millicurie (74 GBq)

Cesium-137 source. With the source in the shielded position, the highest exposure rate of the surface of the device was 360 mr/hr.

The manufacturer also supplied a radiation profile which indicated that the maximum exposure rate at 6" (15.24 cm) was 45 mr/hr and the maximum exposure rate of 1 m (3.28 ft) was 1.7 mr/hr.

LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:

The manufacturer furnishes operating instructions which include step-by-step instructions for using the Pipeliner Model 300, and step-by-step instructions for periodic maintenance of the device.

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The license should include provisions, for 26 pounds (11.8 kg) of depleted uranium.

It should be noted that there are no procedures for source exchange ~by the licensee. The device must be returned to a source supplier for source exchange.

The device shall be possessed and used by persons specifically licensed by the NRC or an Agreement State.

Handling, storage, use, transfer, and disposal: To be determined by the licensing authority.

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

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.: NR-300-D-871-S DATE: OCT 21 1998 PAGE 5 OF 5 DEVICE TYPE: Pipewall Thickness Gauge SAFETY ANALYSIS

SUMMARY

The Pipeliner Model 300 device is no longer manufactured or distributed by Gamma Industries, Inc. and Gamma Industries, Inc.

is no longer in business. Therefore, the registration 4 certificate is being converted to an inactive registration certificate.

1 The device was originally approved for licensing purposes by the Louisiana Division of Radiation Control. NRC attempted to obtain copies of all information submitted by the registrant in support of the evaluation. However, NRC could not locate all the information. Therefore, no safety evaluation of the device was performed as part of the conversion of the certificate to inactive status.

REFERENCES:

The following supporting documents for the Pipeliner Model 300 are hereby incorporated by reference and are made a part of this registry' document. I l

- Gamma Industries' letter dated November 4, 1986 and Gamma Industries Radiation Profile dated November 3, 1986.

l ISSUING AGENCY:

U.S. Nuclear Regulatory Commission

1. l OCT 21 1393 Date: Reviewer: /

/ 4. / ///r[

J Lubinski

/'ohh W.

Date: Concurrence: n MX.lTu.o.

Michele L. Burgesh