ML19295B378
| ML19295B378 | |
| Person / Time | |
|---|---|
| Issue date: | 09/11/1980 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | NORFOLK SHIPBUILDING & DRYDOCK CORP. |
| References | |
| NUDOCS 8010080100 | |
| Download: ML19295B378 (1) | |
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NUCLEAR REGULATORY COMMISSION n
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101 MARIETTA ST., N.W., SUITE 3100 AT LANT A, GEORGI A 3o303
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In Reply Refer To:
RII:JP0 AND D YDOCK CC R
NURFULK SHIPbulLUING P.U. tiUx 2100 suRFULK vA 23501 NHL LIC. #1 (y 01 )
Gentlemen:
The enclosed Bulletin 80-22 is sent to you for action.
If there are any questions related to the requested actions, please contact this office.
Sincerely, C o-P. O'Reilly irector
Enclosures:
1.
IE Bulletin No. 80-22 w/ enc 1 2.
List of Recently issued IE Bulletins e
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8006190050 IEB 80-22 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 September 11, 1980 IE Bulletin No. 80-22: AUTOMATION INDUSTRIES, MODEL 200-520-008 SEALED-SOURCE CONNECTORS Description of Circumstances:
An accident recently occurred in the State of California (an Agreement State) that resulted in several serious overexposures (see enclosed Circular 79-16).
The accident involved the use of an Automation Industries (AI) Model 200-520-008 source pigtail to drive cable connection. The connector is identified by the manufacturer as its " quick disconnect" type of connector and is used with several models of cobalt-60 and iridium-192 source assemblies distributed by the manufacturer. The connection is a simple book and eye connection (see Fig.
- 1) that will permit separation of the eye from the hook when they are oriented at right angles to each other without any further positive action. As a result of the design, a disconnection mcy occur any time the source assembly is cranked out of the exposure device without the guide tube being attached.
Since the Automation Industries Model 200-520-008 sealed-source assembly is authorized to contain up to 120 curies of iridium-192, a source disconnection creates a potential for a serious exposure.
A disconnect is very unlikely to occur if proper procedures are followed by users of Automation Industries sealed sources containing the " quick disconnect".
However, due to the large number of overexposures that occur in the radio-graphy industry due to the failure to follow proper procedures, the NRC has determined that continued use of the Automation Industries " quick disconnect" connector with its Model 200-520-008 sealed-source assembly or other assemblies can constitute a hazard to the public health, safety or interest.
As a result, the NRC has ordered Automation Industries to discontinue distribution of the AI Model 200-520-008 sealed-source assembly or any other sealed-source assembly that uses the " quick disconnect" type of connector.
Additionally, the NRC will not accept new applications for authorization to use the AI Model 200-520-008 or other sealed-source assemblies using the
" quick disconnect".
In effect, this will remove such iridium-192 source and pigtail assemblies from service as licensees exchange their diminished activity Special arrangements should be made for removing from service, those sources.
connectors that are attached to longer lived scu.ces such as cobalt-60.
The removal from service of the " quick disconnect" type of connector will require that those drive cables having the matching open hook connector be modified.
Actions To Be Taken by Licensees To assure the safe operation of radiography equipment in which the AI " quick disconnect" connector is used, all licensees authorized to use byproduct materials under 10 CFR Part 34 shall perform the following:
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IEB 80-22 September 11, 1980 Page 2 of 2 (1) Determine the number of AI Model 200-520-008 and other assemblies in your inventory that have the " quick disconnect" connector and establish a disposal schedule.
Your schedule for iridium-192 sources should be no longer than your usual exchange schedule for diminished activity sources.
Your exchange schedule for connector modification for cobalt-60 sources should be accomplished as soon as is conveniently possible. However, you should complete your disposal or modification by September 1,1981.
(2) In the interim, a warning mark or tag should be placed on each radio-graphic device in which AI " quick disconnect" type assemblies are being used.
(3) This matter should be reviewed with all radiographers. They should be cautioned of the disconnect possibility and be informed of the method used to identify equipment as marked in accordance with Item (2) above.
(4) Review and modify operating, maintenance, inspection and handling procedures as appropriate to preclude this type of accidental disconnect.
NOTE: You may want to contact the manufacturer for assistance in determining appropriate procedural changes or fixes to preclude a disconnect.
(5)
Discuss with the radiographers the importance of making adequate surveys and the need for following procedures.
A report of your actions for c ch of che above numbered items shall be submitted to the director of the appropriate regional office within 30 days from the date of this Bulletin. A copy of the report shall also be sent to the Director, Division of Fuel Facility and Materials Safety Inspection, Office of Inspection and Enforcement, U.S. Nuclear Regulatory Commission, Washington, D.C.
20555.
Approved by GAO, B180225 (R0072); approval expired July 31, 1980.
(Application for renewal pending before GAO). Approval was given under a blanket clearance specifically for identified generic problems.
Enclosures:
1.
IE Circular No. 79-16 2.
Figure 1 a
Accesuuns No.
7 7903070582 fru L SSit45:6830 W J La u UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF THSPECTION AND ENFORCEMENT
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20555 August 16, 1979 IE Circular No. 79-16 EXCESSIVE RADIATION EXPOSURES TO MEMBERS OF THE G RAD 10GRAPHER Description of Circumstances:
During radiographic operations using 40 curies of iridium-192, the source became disconnected unbeknownst to the radiographer--he did of the customer for which radiography was perfonned, saw the source and, survey instrument.
He not knowing what it was, picked it up and placed it in his hip pocket.
carried it about for approximately two hours, later giving it to his su belonged to the radiographer, and while waiting for the radiographer to pick visor to examine.
up the source, nine employees of the radiographer's customer were expo h
source was also left with a secretary who was instructed to contact the radiog The radiographer returned, examined and took the source assurring the c employees that there was no problem, stating that the source was a " d On the evening of the event, the employee who had put the source in his At that time pocket became nauseous and went to a hospital for treatment.The initial diagnosis an a blister was found on his buttock. Thirty one days after this initial treatment the indi-At that vidual was hospitalized for treatment of the injury to his buttock.
for an insect bite.
time the individual asked the physicians if there could be any connection of the injury to the radiography that had been performed at his place one month previously.
information.
The individual who had carried the source in his pocket remains under The attending physician does not cons.ider the care following surgery.
Neither does amputation appear necessary.
exposure to be life threatening.The localized dose is estimated to be 1.5 m 60,000 rem at I cm depth and 7,000 rem at 3 cm depth. Hand doses ranged to doses to other individuals ranged from 1 to 60 rem.The radiographer r 5,000 rem.
body and S0 rem to the hands.
However, another important aspect These are serious radiation overexposures.
is of the case, second only to the physiological effects of d
The radiographer's failure to individuals and for his own personal safety. inform the involved ind i
d management within his own and the customer's company is a serious d s for safety and denied the exposed individuals early medical attentien.
IE Circular No. /9-16 August 16, 1979 Page 2 of 3 The primary cause of this incident was the failure to perform a radiation survey, a common underlying cause in radiation overexposures in the radiography industry. The number of radiation overexposures experienced in the radiography industry over the past several years has been higher than for any other single group of NRC licensees.
To inform radiography licensees of NRC's concern for these recurring overexposure incidents, NRC staff representatives met with licensees in a series of five regional meetings during the period December 1977 throught March 1978. The main purposes of the meetings were to express NRC's concern for the high incidence of overexposures, and to open a line of communication between the NRC and radiography licensees in an effort to achieve the common goal of improved radiation safety. A written summary of those meetings was published by the NRC in NUREG-0495, "Public K_eting on Radiation Safety for Industrial Radiographers".
A copy of that document was mailed to each NRC radiography licensee and to other companies which sent representatives to the meetings.
The remarks prosented by the staff and subjects discussed at those meetings included, among others, ways and means of incorporating safety into radiography operations, and case histories of overexposure incidents, with highlights of the causes and possible preventions.
In a discussion of the causes of over-exposures, a presentation of statistics at the meetings showed that the failure of the radiographers to perform a radiation survey af ter each radiographic exposure was by far the most prevalent cause. While these surveys are required by regulation in 10 CFR 34.43(b), they are also the most basic, fundaruntal and common-sense thing to do when dealing with radiation levels inherent in a typical radiography operation.
Failure to perform the surveys indicates a lack of train-ing intensive enough to permanently instill in radiographers the extreme importance of surveys for protection of both themselves and other people. Some of the case histories discussed in NUREG-0495 resulted in painful radiation injury to hands and fingers, with eventual loss of one or more fingers in some cases.
Notice to Radiography Licensees:
NRC licensees authorized to use byproduct material under 10 CFR Part 34 are requested to take the following actions:
1.
Review the event described in this Circular (and the other case histories in NUREG-0495) with all of your radiographic personnel at an early date; discuss and emphasize:
the extreme importance of radiation surveys in assuring protection a.
of themselves and of other people, and b.
the importance of reporting promptly any unusual events or circumstances to responsible management.
2.
Review your training to assure that appropriate emphasis is placed on the subjects in item 1 in both initial and refresher training courses.
9
IE Circular No. 79-16 August 16, 1979 Page 3 of 3 3.
Review your internal audit program to assure that appropriate emphasis is placed on these same subjects, particularly the requirenent for auditors to observe radiographic operations to assure the proper coaduct of radiation surveys.
No written response to this Circular is required.
If you need additional information regarding this subject, please contact the Director of'the appropriate NRC Regional Office.
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IEB 80-22 September 11, 1980 RELENTLY ISSUED IE BULLETINS Bulletin No.
Subject Date Issued Issued To 80-22 Automation Industries, Model 9/11/80 All radiography 200-520-008 Sealed-Source licensees Connectors 79-26 Boron loss from BWR 8/29/80 All BWR power Revision I control blades facilities with an OL 80-20 Failures of Westinghouse 7/31/80 To each nuclear Type V-2 Spring Return power facility in to Neutral Control Switches your region having an OL or a CP 80-19 Failures of Mercury-7/31/80 All nuclear power Wetted Matrix Relays in facilities having Reactor Protective Systems either an OL or a CP of Operating Nuclear Power Plants Designed by Combus-tion Engineering 80-18 Maintenance of Adequate 7/24/80 All PWR power reactor Minimum Flow Thru Centrifugal facilities holding OLs Charging Pumps Following and to those PWRs Secondary Side High Energy nearing licensing Line Rupture Supplement 2 Failures Revealed by 7/22/80 All BWR power reactor to 80-17 Testing Subsequent to facilities holding OLs Failure of Control Rods to Insert During a Scram at a BWR Supplement 1 Failure of Control Rods 7/18/80 All BWR power reactor to 80-17 to Insert During a Scram facilities holding OLs at a BWR 80-17 Failure of Control Rods 7/3/80 All BWR power reactor to Insert During a Scram facilities holding OLs at a BWR 80-16 Potential Misapplication of 6/27/80 All Power Reactor Rosemount Inc., Models 1151 Facilities with an and 1152 Pressure Transmitters OL or a CP with Either "A" or "D" Output Codes 80-15 Possible Loss Oi Hotline 6/18/80 All nuclear facilities With Loss Of Off-Site Power holding OLs