ML20206Q919

Registry of Radioactive Sealed Sources & Devices,Safety Evaluation of Device for Model Agt 400.Certificate: NR-1064-D-101-G

ML20206Q919
Person / Time
Issue date:	01/11/1999
From:	Steven Baggett, John Lubinski NRC
To:
Shared Package
ML20206Q913	List: ML20206Q909 ML20206Q919 ML20206Q984 ML20206R094
References
SSD, NUDOCS 9901190055
Download: ML20206Q919 (13)

Text

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j REGISTRY'OF RADIOACTIVE SEALED SOURC'ES AND DEVICES SAFETY EVALUATION OF DEVICE A

NO.::NR-1064-D-101-G'. 4 .DATE: - gg ) 11999 PAGE 1 OF 10 DEVICE' TYPE: Gamma Gauge:

MODEL:- AGT<400 MANUFACTU$tER / DISTRIBUTOR : Advanced Gauging Technologies, L.L.C. l

. 8323--Big; Walnut Road, Suite 100

-Westerville, OH 43082-9467

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SEALED SOURCE MODEL DESIGNATION: Amersham Model AMC.19

- Bebig Trade.Model AM1.G44 l

l l r-ISOTOPE: ~ MAXIMUM ACTIVITY:

Americium-241 liCurie-_(37 GBq)

. LEAK TEST FREOUENCY: 6 Months i-PRINCIPAL USE: (D). Gamma Gauges.

9901190055 990111

• PDR RC SSD PDR l1 .

CUSTOM DEVICE: YES X NO i

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i REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NQ,: NR-1064-D-101-G DATE: j u 1 1 1333 PAGE 2 OF 10 DEVICE TYPE: Gamma Gauge

' DESCRIPTION:

The AGT 400 is a source housing designed for measurements in industrial environments such as steel mills and other factories.

It is part of a transmission gauge with the radiation source housing and detector housing ("the measuring heads") on opposite sides of the material being measured. The thickness is determined by measuring the amount of radiation which penetrates the material between the heads.

The AGT 400 is housed in a cylindrical aluminum housing tube which has a wall thickness of 0.5" (1.27 cm). It's dimensions are as follows: the diameter is 7" (17.78 cm) or 8 " (20.32 cm),

-depending on customer requirements, and the height is 3" (7. 62 cm) . The top cover plate is 0.25" (6.35 mm) thick aluminum and has a shutter position inspection port to allow visual inspection of shutter's mechanical position, (i.e., open [ red]

and closed [ green]). The seal between the top cover plate and the housing assembly is provided by 1/16" (1.59 mm) thick neoprene rubber gasket. The bottom cover plate is 0.5" (1.27 cm) thick aluminum. Both top and bottom covers are secured to the source head housing tube using six 8-32x1/2" stainless steel socket head screws, at least one of which shall be a tamper

. resistant screw of the pin-in-hex type for each cover.

The sealed source is held captive in a brass source holder (1.75"

[4.45 cm) outside diameter, 0.375" (9.53 mm) thick, and 1.75"

[4.45 cm] high) and between the solenoid mounting plate and the bottom of the source head.

Under the sealed source, there are one lead spacer (1.21"

[3.07 cm) diameter and 0.02" [0.51 mm) to 0.07" [1.78 mm) thick depending on the thickness of source capsule) and one aluminum spacer (1.187" [3.01 cm] diameter and 3/8" [9.53 mm) thick).

When mounted in the source head, the source holder is covered by a tungsten alloy shutter (1.4" [3.56 cm) in diameter by 0.1"

[2.54 mm) thick). This shutter opens against a spring in the solenoid, so that if power.is lost the spring force will close the shutter. The shutter can be locked in the closed position by

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES ,

SAFETY EVALUATION OF DEVICE I 1

I NO . NR-;.0 6 4-D-101-G DATE: PAGE 3 OF 10 g g g ; ;g33 pjVICE TYPE: -Gamma Gauge DESCRIPTION (Cont'd):

a key switch in the operator's control station. The key cuts off the power to the shutter solenoid, returning the shutter to the shutter closed position. The key can not be removed in the open position, nor can the shutter be locked in the open position.

A space ring under each solenoid is provided to distribute the load across the entire base of solenoid so that it can reduce the risk of shearing off the mounting studs holding the solenoid in place.

There are three visible indicators of shutter status are provided: two electrical and one mechanical. On the display screen of the operator's control station a red indicator shows shutter open, a green indicator shows closed. Adjacent to the source head a red light shows shutter open, a green light shows shutter closed. On the top surface of the source head a mechanical indicator shows red for shutter open, green for' shutter closed. This indicator is visible through a clear acrylic window (0.5" [1.27 cm] diameter with 1/8" [3.18 mm) thick) in the top of the source head.

Various mounting arrangements may be used. However, the method of mounting the measuring heads is the same in all installations.

l The source head is mounted using at least four, and as many ac six,'1/4"-20 stainless steel socket head cap screws. The detector head is mounted directly above and aligned to within %"

(1.27 cm) of the axis of the source head. The typical air gap in an AGT 400 device is 6" (15.24 cm) to 8" (20.32 cm), and the maximum air gap is 12" (30.38 cm).

DIAGRAMS.

See Attachments 1 and 2.

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i REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES -

SAFETY EVALUATION OF; DEVICE I NO,: NR-1064-D-101-G. '

DATE: PAGE 4 OF 10 JAN 11 }339 DEVICE TYPE: Gamma Gauge LABELIhh l

The device is labeled-in accordance with 10 CFR 20.1901. The label'contains the radiation symbol, model number, serial number, isotope,: quantity, date of assay, name of manufacturer, and the words " CAUTION-RADIOACTIVE MATERIAL."

The label also contains the words required by 10 CFR 32.51.

The label is made of aluminum label, rectangular in shape with a dual attachment system in order to reduce the chance of the label being torn off the head. There is adhesive on the back of the label, and it is mechanically attached with four button head screws.

The label is attached to the side of the source housing and is visible to users in the area of the device.

s CONDITIONS FOR NORMAL USE:

The device's radiation beam points vertically and measures the thickness of flat sheet material in industrial environments. The expected operating conditions are:

Temperature 0 to +122*F (-18 to +50 C)

Humidity Low Humidity Pressure Atmospheric Corrosion Ranges from zero to low corrosive vapors Vibrations Ranges from zero to low Fire NEC Division 2 hazardous area possible Explosion NEC Division 2 hazardous area possible The device itself lasts generally 15 years based on the Am-241 capsule manufacturer's specifications, i

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES

! SAFETY EVALUATION OF DEVICE NO.: NR-1064-D-101-G DATE: PAGE 5 OF 10 JM 11 GH DEVICE TYPE: Gamma Gauge PROTOTYPE' TESTING:

A prototype of the Model AGT 400 was subjected to the tests listed below. No malfunction occurred nor was there any loss of shielding or containment integrity.

Temperature 185 F (85 C) '

Vibrations Approximately 60 Hz at an amplitude of 0.5 mm

(0.02") for 30 minutes Impact Dropped three times from a height of 1.2 m l (3.94 ft) l OFF/ON Mechanism Operated by solenoid for a total 20,000 times l at 3 seconds intervals A prototype of the device has been tested in accordance with ANSI N538-1979 and has achieved a classification of 43-555-885-R4.

The device passed the tests in accordance with the acceptance l criteria included in the standard.

The solenoids used in the AGT 400 device are rated for one million cycles at an ambient temperature of 20 C (68 F). With an anticipated annual use of 20,000 cycles per year and a 15 year working life, the total number of cycles for the AGT 400 shutter is'about 30% of the manufacturer's specification. This margin of design indicates that the shutter should be reliable. Further evidence comes from the historical record of the GR100, which uses the same solenoids.

The design of the AGT 400 device is virtually identical to that of the GR100 device (manufactured and distributed by Gamma Instruments, Inc.) which was originally licensed for distribution to' general licensees by the State of California in September 1981 and was re-licensed by the State of Illinois in June 1996. There

are approximately 300 GR100 installations and Advanced Gauging l Technologies reports that there have not been a case in more than 16 years since.the first GR100's were place in service where the shutter mechanism, the source holder mechanism, or the other  ;

' radiation safety containment features of the source have been  !

damaged to the point of failure.

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

.NO.: NR-1064-D-101-G DATE: gg;ggg PAGE 6 OF 10

-DEVICE TYPE:

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' Gamma Gauge, PROTOTYPE TESTING (Cont'd)-

, The' sealed sources used in the device have been tested by their manufacturers and have achieved the ANSI N542-1977 Classification of C64344.

EXTERNAL RADIATION LEVELS:

,The manufacturer reports that the following measured external radiation levels-were taken around the AGT 400 gauge using a Technical Associates Model CP-5M Cutie Pie. Radiation readings were taken for a 1.0 Ci (37 GBq) of Am-241 sealed source at distances of 5, 30, and 100 cm (1.97, 11.81, and 39.37 in.) from the device surface. Measurements were.taken while the gauging device was in both the open and closed positions. The air gap width of 12" (30.48 cm) gave the maximum radiation levels.

Maximum Radiation Level (Gap Width 12" [30.48 cm])

~ Distance _

Shutter Open (inches) (cm) (mrem /hr) ( Sv/hr)

'1.97 5 6.00 60.0 11.81' -30 0.40 4.0 39.37 100 0.40 4.0

'The maximum radiation level around the source housing with the )

shutter closed does not exceed 0.2 mrem /hr (2.0 pSv/hr). 1 Those measurements were made using the rectangular steel outer

' housing (8.75" x 7" x 3.5" (22.23 cm x 17.78 cm x 3.39 cm]) with j aluminum top cover for the AGT400 source head. The change to a ,

cylindrical. aluminum outer housing has no effect on the dose rate  !

L profiles because virtually all the shielding in the AGT400 source L head comes from the brass cylinder which houses the source and I

the heavy metal shutter which covers the source in the closed position. l l

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.: NR-1064-D-101-G DATE: jg j g gg PAGE 7 OF 10

.EEVICE TYPE: Gamma Gauge- ' '

EXTERNAL RADIATION ~ LEVELS (Cont'd):

The diameter of the head housing tube may be 7" (17.78 cm) or 8" (20.32 cm), depending on customer requirements. The size of the head housing tube has less than 10% effect on the dose rate

- profiles at 30 cm (11.81"), and less than 3% at 100 cm (39.37").

. The effect of this diameter change can be estimated using'the inverse square relationship between the dose rate and the source i measuring instrument distance.

h Teef fect of changes . in alignment of 3P (1.27 cm) or less between-the measuring heads also affects the dose rate profiles at 3 0 cm (11.81") and 100 cm ( 3 9. 37 " ) by less than 10% and less than 3%, respectively. For the low dose rates around the AGT400 source head these possible variations would not have significant effects on possible exposure to generally-licensed gauge users.

OUALITY ASSURANCE AND CONTROL:

1 The manufacturer maintains a quality assurance and control program which has been deemed acceptable for licensing purposes by NRC. A copy of the program is on. file with NRC.

LIMITATIONS AND OTHER CONSIDERATIONS OF USE:

-* This device may be distributed to persons generally licensed by NRC or an Agreement State.

• Handling, storage, use, transfer, and disposal: As required by 10 CFR-31.5 or Agreement State equivalent.

• - Installation,- service, repairs, andLtraining of the AGT 400 device shall be performed only by the device manufacturer or persons specifically licensed for these functions by NRC or an Agreement State.

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

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NO. NR-1064-D-101-G DATE: PAGE 8 OF 10

.MN11GH DEVICE TYPE: Gamma. Gauge 1

LIMITATIONS AND OTHER CONSIDERATIONS OF USE (Cont'd): I l

• . The device shallibe tested for proper functioning of the ON/OFF mechanism =and-indicator at installation and at i , . intervals not exceeding f months by person (s) specifically licensed by NRC or from.an Agreement State to perform such activities.

The device shall be leaked test at intervals not to exceed 6 months using techniques capable of detecting l 0.005 microcurie (185 Bq) of removable contamination.

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

!-  : SAFETY ANALYSIS

SUMMARY

. Based on our review of the manufacturer's information and test data, our conclusion regarding the safety of the AGT 400 gauging

-devices is as follows:

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• The device can be safely operated by persons not having training in radiological protection.

L *. lUnder ordinary conditions of handling, storage, and use of l

x- the device, the byproduct material contained in the device will not be released or inadvertently removed from the source housing, and it is unlikely that any person will receive in any period of one calendar quarter a dose in L ,

excess of 10 percent of the limits specified in the table in Section 20.1201(a) of 10 CFR Part 20.

• Under accident conditions associated with handling, storage, and use of the source housing, it is unlikely that any person would receive an external radiation dose or dose commitment in excess of the dose to the appropriate organ as specified in the following chart:

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REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.:. NR-1064-D-101-G DATE1 JAN 118% PAGE 9 7F 10 DEVICE TYPE: Gamma Gauge SAFETY ANALYSIS

SUMMARY

(Cont'd)-

PART OF BODY DOSE Whole body; head and trunk; active blood-forming' organs; gonads; or lens of eye 15 rem (0.15 Sv)

Hands and forearms; feet and ankles; localized areas of skin averaged over areas no larger than 1 cm2 200 rem (2.0 Sv)

Other organs 50 rem (0.50 Sv)

Based on review of the Model AGT 400, and the information and test data cited below, we conclude that the device is acceptable for licensing purposes.

Furthermore, we conclude that the device would be expected to maintain it's containment integrity for normal conditions of use and accidental conditions which might occur during uses specified in this certificate.

The only likely personnel to be in the vicinity of the device due to the location of the device are those persons performing maintenance on the device.

REFERENCES.

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

• Advanced Gauging Technologies' application dated, March 3, 1998, with enclosures thereto.

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES l SAFETY EVALUATION OF DEVICE j NO.: NR-1064-D-101-G DATE1 JAN 111333 PAGE 10 OF 10 DEVICE TYPE: Gamma Gauge i

l REFERENCES (Cont'd)-

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Advanced Gauging Technologies' letter dated November 20, '

1998, with enclosures thereto.

Advanced Gauging Technologies' e-mail dated January 9, 1999.

ISSUING AGENCY:

U.S. Nuclear Regulatory Commission Date: Reviewer: / I />!

John W. Lubinski JANIi1333 /

Date: Concurrence: . 5) /?/#

' ' Steven 'L . Baggett

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REGISTRY OF RADIOACTIVE SEALED SOURCE AND DEVICES SAFETY EVALUATION OF DEVICE RQL NR-1064-D-101-G DATE: JAN 111399 ATTACHMENT 1 l

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Mr. Ronald L. Cook, President Advanced Gauging Technologies, LLC 8323 Big Walnut Road, Suite 100 January 11, 1999 Columbus, OH 43082-9467

Dear Mr. Cook:

Based on the information and test data submitted in your application dated March 3,1998, with enclosures thereto, we conclude that the AGT 400 thickness measuring device is acceptable for licensing purposes in accordance with the conditions of the enclosed registration certificate (NR-1064-D-101-G). A copy of the certificate has been forwarded to the appropriate reviewer for licensing action.

Please be advised that you must manufacture and distribute the product in accordance with the l

statements and representations contained in your application, with enclosures thereto, and the information set out in your registration certificate. As a general rule, you must request and obtain an amendment to the certificate before you make changes or modifications to the information submitted to obtain the certificate.

Please read over the registration certificate in its entirety and notify us immediately of any errors or omissions.

l You are obligated to notify us promptly in writing should you decide to no longer manufacture or offer service support for the product.

l Please be aware that, as a holder of an NRC registration, you may be subject to the NRC's licensing and inspection fees in accordance with 10 CFR Part 170, and annual fees in

- accordance with 10 CFR Part 171. If you have any questions concerning the fee requirements, please contact the License Fee and Debt Collection Branch at (301) 415-7544.

If you have any questions, please contact me at (301) 415-5787 or Mr. John Lubinski at (301) 415-7868.

Sincerely, original signed by Seung Lee Seung J. Lee, Mechanical Engineer Materials Safety Branch Division of Industrial and Medical Nuclear Safety Office of Nuclear Material Satoty and Safeguards

Enclosure:

As stated cc w/ encl: SKimberley, LFDCB Distribution: g MSB r/f IMNS r/f SSD-98-36 ' NE01 SSD File # NR 1064-D-101-GC# ---

DOCUMENT NAME: H:\SJL\N1064101. CMP

- Ta receive a copt of thle document. Indicate in the box: "C" = Cooy without a4chrnent/ enclosure "E* = Copy with attachment / enclosure 'N' = No copy OFFICE MSB lE MSB < J Al NAME Slee (// JLubinski AA(

DATE 01/11/99 01/j l /99 ')

OFFICIAL RECORD COPY

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