ML20202E490

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Registry of Radioactive Sealed Sources & Devices,Se of Source Holder for Movement Detector for Model RSS-811 (Safety Ray).Certificate:NR-8086-D-801-B
ML20202E490
Person / Time
Issue date: 03/07/1997
From: Steven Baggett, Thomas Rich
NRC
To:
Shared Package
ML20202E472 List:
References
SSD, NUDOCS 9802180164
Download: ML20202E490 (10)
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Text

t REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.: NR-8086-D-801-B DATE: March 7, 1997 PAGE 1 OF 6 DEVICE TYPE: Source Holder for Movement Detector MODEL: RS"-811 (Safety" Ray)

P MANUFACTURER / DISTRIBUTOR: GE Reuter-Stokes, Inc.

Edison Park, 8499 Darrow Road Twinsburg, OH 44087-4045

. Republic Steel Corp. (Formerly)

Research Center Independence, OH 44131 SEALED SOURCE MODEL DESIGNATION: Monsanto Research 2705 New England Nuclear NER-479C ISOTOPE: MAXIMUM ACTIVITY:

Americium-241 1 Ci (37 GBq)

LEAK TEST FREQUENCY: 6 Months PRINCIPAL USE: (T) Other CUSTOM DEVICE: YES X NO 9802180164 970310 PDR RC

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? REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES ~

SAFETY. EVALUATION OF DEVICEf' J

NO.1 NR-8086-D-801-B DATE: March 7, 1997 PAGE^2 OF-6 ,

DEVICE TYPE: Source' Holder for: Movement De ctor j -DESCRIPTIONt-GE Reuter-Stok'es, 'Inc. . (formerly Republic Steel' _ Corporation).

= Model' RSS-811. (Safety Ray) detector systems detect the presence or absence of moving objects in~ steel rolling, mill operations.

LThe Safety Ray source holder contains one Monsanto Research L LCorporation Model 2705 or New England _ Nuclear NER-479C sealed  ;

source held in a rear position of_a 1 inch (2.54 cm) thick walled-

. cylinder _of Type.304 stainless steel. The_ rear-end plate'of'

- 1 inch (2.54 cm)- thick thickness, the recessed 0.010 inch-(0.025<. cm) thick window, and the 0.25 inch (0.635 cm) thick

-foreplate are also constructed of Type 304 stainless steel. The source holder measures 6.5sinches (16.5 cm) long by 3 inches (7.62 cm)1 diameter. 'The source is hermetically sealed within the -

device by placing a gasket over.the source and then_ bolting the-2 cover plate onto the scurce holder. The -assembbi is held

. together_by tamper proof bolts. In all directions but in-that of j

Lthe 1 inch (2.541cm) diameter beam-port, up . to one -inch (2.54 cm)

.of steel shieldingLis-provided. The' device does not have a shutter mechanism. .The source holder-is welded:to its base:which is bolted to a' supporting structure when installed.

As:an-added precaution, an additional steelaplate'is:placed in-

.the beam window to minimize the. radiation exposure'that.might occur during shipping _ and insta]1ation: procedures., This temporary: shield is removed when'the syst'em is readybto be placed

'in service'. Once the-cover plate is removed,..the' device. remains =

in the "ON" position. ,. ,

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Republic Steel. Corporation furnished laniinstruction manual (which provides step by step instructions and precaution's'concerningh

installation, operation, and' safety. The, manual contains-the~

following representations: ~. -

e Warnings concerning unnecessary, exposures, e1 Warning concerning tampering with th'e source holder and containing against unauthorized = disposal.

  • Step by step instructions in"the use'of Republic Steel Corporation leak test kit, o Emergency instructions for dealing with damaged or leaking devices.

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REGISTRY OF RADIOACTIVE: SEALED-SOURCE"-AND~ DEVICES-SAFETY EVALUATION OF ' DEVIC ' ' '

v.

NO.: NR-8086-D-801-B DATE:t March'7,'1997 PAGE 3 OF'6 DEVICE TYPE: Source Holder for Movement Detector ,

I DIAGRAM: 3 l

See attachments 1 and'2. ,

LABELING:

The devices are labeled _in accordance with the requirements of 10 CFR 32.51, when distributed as generally licensed' devices.

Labels constructed of 0.125 inch (0.313 cm) thick Type 316 stainless steel are engraved with markings (legible to 950*F (510 *C)) substantially similar to the following:

" Caution, Radioactive Material; the receipt, possession, use and transfer of this device are subject to a general license and the Regulations of the U.S. NRC Or an Agreement State.

Removal of this label is prohibited; this label shall be maintained in a legible condition. See instruction manuals before installation, operation or servicing." " Republic Steel Corporation, Cleveland, Ohio, SAFETY RAY, Serial Number, 1 Curie, AM-241," and the radiation symbol.

The devices are labeled in accordance with 10 CFR 20.1901-when distributed to persons specifically licensed. Labels constructed of 0.04 inch (0.1 cm) thick Type 316 stainless steel are etched with markings substantially similar to the following:

" Caution, Licensed Radioactive Material; Installation, removal, or servicing of this device only under authorized supervision. Removal of this label is prohibited." "GE Reuter-Stokes, Serial Number, 1 Curie AM-241," and the radiation synbol.

CONDITIONS OF NORMAL US2:

The Model Safety Ray is intena,..i for use in steel rolling mills and will likely experience extreme environmental conditions. The device is designed to operate in up to 752'F (4 00

  • C) environments and in a hot moist atmosphere. The devicenis designed to be safely operated by persons not having training in radiological safety.

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

NO,: NR-8086-D-801-B DATE: harch 7, 1997 PAGE 4 OF 6 DEVICE TYPE: Source Holder for Movement Detector PROTOTYPE TESTING:

These devices have been manufactured and distributed under NRC specific and general licenses by Republic Steel Corporation and GE Reuter-Stokes, Inc since 1975.

EXTERNAL RADIATION LEVELS:

In the beam center, maximum radiation levels are as follows: at the window - 10 mR/hr (100 pSv/hr) , at i ft (30 cm) from the window - 4 mR/hr (40 pSv/hr) , and at 6 ft (1.8 m) -

less than 1 mR/hr (10 pSv/hr). The nearest access.tgr personnel to the low level radiation beam while a mill is in operation is typically 15 to 20 ft (4.6 - 6.1 m). When the mill is notLin operation,.a person would have to work in the' beam (at a distance of 6 ft-(1.8 m) from the source) for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> per week to exceed 10% of the limits set forth in 10 CFR,20.1201, which is extremely-unlikely. It is unlikely that any person would receive an external radiation dose or dose commitment in excess to levels.

specified in 10 CFR 32.51.

OUALITY ASSURANCE AND CONTROL:

The Republic Steel Corporation submitted a quality assurance ~and control program which was deemed acceptable for licensing purposes by NRC. A quality assurance and control program for GE

'Reuter-Stokes, Inc. was not submitted.

LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:

e The device is no longer manufactured or2 distributed by GE Reuter-Stokes, Inc.

  • Maintenance, repair, and initial radiation survey of devices containing radioactive material, leak testing, installation, replacement and dtsposal of sealed sources containing radioactive material used in this device can only be performed by persons holding a specific license.
  • The device has been distributed to specific and general licensees of NRC or Agreement States.
  • Handling, storage, use, transfer, and disposal: To be determined by the licensing authority.

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.: NR-8086-n-801-B DATEL March 7, 1997 EAGE 5 OF 6 DEVICE TYPE 3ou,ce Holder for Movement Detector L p/ITATIONS AND/OR OTHER CONSIDERATIONS OF USEt (Cont'd) e The device shall be leak tested at intervals not to exceed 6 months using techniques capable of detecting 0.005 pCi (185 Bq) of removable contamination.

o Reviewer Notet Inspector / Reviewer should ensure that the licensee performs leak testing at the required intervals and at the time the unit is serviced. Reports of Aeaking sources in the Model Safety Ray devices should be coordinated with the Medical, Academic, and Commercial Use SafGty Branch, IMNS, NMSS, for determination of generic issues.

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

SAFETY ANALYSIS

SUMMARY

Since the effective date cf this document, the Model Safety Ray devices are not current products manufactured nor serviced by the Republic Steel Corporation or GE Reuter-Stokes, Inc. However, the devices remain acceptable for use by general and specific licensees.

The Model Safety Ray was registered by Republic Steel Corporation

~1n 1975 as a device to be used under a general license. An

-application dated November 12, 1976, was received from Reuter-Stokes Instruments, Inc. requesting to manufacture and distribute the Model Safety Ray to be used under a specific license. In 1984, Republic Steel Corporation merged with another steel company and the resulting company was called LTV Steel Company.

In a letter dated August 6, 1991, LTV Steel Company informed the NRC that the registration certificate for the Model Safety Ray should be transferred to Reuter-Stokes Instruments, Inc. because the rights to manufacture and distribute the Model Safety Ray had been transferred to Reuter-Stokes Instruments, Inc. a few years prior to the formation of LTV Steel Company. Reuter-Stokes Instruments, Inc. ceased distribution and servicing of the Model Safety Ray in the early 1990's and is now named GE Reuter-Stokes, Inc.

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE NO.t NR-8086-D-801-B DATE: March 7, 1997' PAGE 6 OF 6 DEVICE TYPE: Source Holder for Movement Detector SAFETY ANALYSIS

SUMMARY

(Cont'd)

There have been instances of leaking sources. Thret .aaking sources were identified by GE Reuter-Stokes, Inc. during routine servicing when the source holder was opened and the gasket removed. No contamination was detectable on the outer surface of the source holder. One leaking source was returned to the manufacturer for disposal and analysis. The manufacturer was unable to determire the failure mode or root cause of the failure. As of this time, no further information is available indicating that this is a generic problem.

REFERD'CES t The following supporting documents for the Model Safety Ray are hereby incorporated by reference and are made a part of this registration certificate.

  • Republic Steel Corporation letter dated October 31, 1975.

e LTV Steel Company letter dated August 6, 1991.

  • GE Reuter-Stokes, Inc. letter dated December 19, 1996, and facsimile dated February 20, 1997, with enclosures thereto.

ISS_ qui:1.. AGENCY :

i U Nuclear Regulatory Commission Date: March 7, 1997 Reviewer: - *' N M '

Thomas W. Rich 9

Date: March 7. 1997 Concurrence: sd

' Steven L7 Baggett 4

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