ML20198G074
| ML20198G074 | |
| Person / Time | |
|---|---|
| Issue date: | 02/20/1986 |
| From: | Steven Baggett, Stephen Bell NRC |
| To: | |
| Shared Package | |
| ML20198G014 | List: |
| References | |
| SSD, NUDOCS 9708130276 | |
| Download: ML20198G074 (7) | |
Text
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REGISTRY OF'RADI0 ACTIVE SEALED SOURCES-AND DEVICES
~4' SAFETY-EVALUATION OF DEVICE 1
PAGE:
1 of 5 NO: NR-321-D-105-S
,0 ATE:
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0EVICE TYPE:
Contir.uous Level Indicator MODEL:'
13320 l
MANUFACTUPER/ DISTRIBUTOR:
General Nucleonics, Inc.
- 2807 Metropolitan Place y
Pomona, CA 91767 rn > >
, 4 ii SEALED SOURCE MODEL-DESIGNATION:
General Nucleonics Model No. 13326 2
ISOTOPE:
MAXIMUM ACTIVITY:
Krypton-85 10.8 curies (Total for the seven sources used-in-the-device. No source shall exceed 2.5 curies)
LEAK TEST FREQUENCY 1 Not required PRINCIPAL USE:
(E) Beta' Gauge CUSTOM DEVICE:
X YES NO Hawaiian Independent Refinery
~~
91-325 Komohana Street Ewa Beach, Hawaii 96707 9708130276 970008 PlHt RC SSD PDR
REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE-NO: NR-321-D-105-S DATE:
g gg PAGE:
2 of 5
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-DEVICE TYPE:
Continuous Level Indicator DESCRIPTION:
This system utilizes a continuous source holder to gauge-the height of material over a six. foot span in the Hawaiian Independent Refinery, Inc. T-175 vacuum tower. The Model 13320 source enclosure is a 71 foot tall, 6 inch diameter stainless steel cylinder (with one side flat) which contains a 4 inch 0.D.
-inner cylinder welded to the same flatened side-(see attached sketch). The volume between these two cylinder is lead filled. A third cylinder fits inside
.the 4 inch 0.D.-tube and rotates on a center shaft. This cylinder has a 1 inch
-deep grove.to hold the source tubes. Rotating the innermost cylinder 180' carries the source tubes from "0N" (source shine into the vessel) to " SAFE" position =in which'the source.is shielded in all directions. The source _can be locked in the " SAFE" position whenever someone must work inside the_ vessel or if the source enclosure has to-be moved or relocated.
'The sources are 3/4 inch diameter by 1 foot long tubes filled with gaseous Krypton-85 and sealed with welds at both ends. There are 7 tubes in all with different amounts of Kr-85. The strongest at the lower end of the source enclosure, contains 2.5 times more Kr-85 than the top one for instance, so the response to changes in height of reduced crude is linear over the 6 foot range.
LABELI.':G:
The device is affixed with two labels that contain the information required by
--10 CFR 20.203.
DIAGRAM:
See attachment 1 and 2.
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4 REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES
-ar SAFETY EVALUATION OF. DEVICE
.A N01-NR-321-D-105-S DATE:
FEB80gggl PAGE: 3 of 5 DEVICE' TYPE:
Continuous Level Indicator CONDITIONS OF NORMAL USE:
The device is used to monitor the level of vacuum tower number T-175. The device is mounted to the tower at approximately 25 feet above the ground and
'the only access is by-ledder. The device is subjected to environmental conditions intrinsic to Hawaii.
PROTOTYPE TESTING:
No testing was done on this custom unit. The device is very similar with the exception of activity and shielding dimensions to a gauge design approved by the State of California in 1977. We have no reason to believe that this custom unit would behave any differently when sub,iected to the specified conditions of use, then the currently approved unit.
EXTERNAL RADIATION LEVELS:
The radiation dose rate near the source caclosure will be les; than 2 mR/hr on the surface and less than 0.5 mR/hr at ? ft., so personnel working near the system will not need-to wear film badges or other monitoring devices. Only inside the vessel, with the source in the "0N" position, will the radiation levels exceed the 2 mR/hr that would require wearing film badges. The manufacture also reported a dose rate of 5 mR/hr at 30 ft., in the beam path inside the vessel.
QUALITY ASSURANCE AND CONTROL:
.This device is manufactured by General Nucleonics of California. They have been in the gauging business for several years. The State of California has found their Quality Program acceptable for licensing purposes.
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REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES i
SAFETY EVALVATION OF DEVICE NO NR-321-0-105 $
DATE:
IIIIIO III pAGE 4 of 5 OEVICE TYPE:
Continuous level Indicator LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USEt This device shall only be distributed to Hawaiian Independent Refinery, Inc.
Handling, storage, use, transfer, and disps, alt To be determined by the licensing authority.
The device shall be installed and initially tested for proper operation of the source exposure mechanism, safety warning components, labels, external radiation levels (fource exposed, sour:e shielded) and leak tested by General Nucleonics, Inc. or other persons specifically licensed by the TOC or an Agreement State.
1 This registration sheet and the information contained within the i
references shall not be changed or transferred without the written consent of the NRC.
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SAFETY ANALYSIS
SUMMARY
1 Based-on our review-of the information cited below, we conclude that the Model 13320 continuous level indicator design is acceptable for custom licensing purposes.
Futhermore.. based on operational history of a similar uevice registered by the State of California, we conce.'de that-this device would be expected to maintain its integrity for normal conditions of use which might
- occur during uses specified in this certificate.
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i REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALVATION OF DEVICE i
PAGE:
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DEVICE TYPE:
Continuous Level Indicator i
REFERENCESt The following supporting documents for the device Model 13320 are hereby incorporated by reference and are made a part of this registry document.
Hawaiian independent Refinery, Inc, letters dated July 26, 1985 and i
September 30, 1985 with enclosure thereto.
4 General Nucleonics certificote of registration Number CA 321-5-102 5 dated April 20, 1972.
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ISSUING i.GENCY:
U. S. NUCLEAR REGULATORY COMMIS$10N I-
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