Part 21 Report - 1995-167
ACCESSION #: 9505180293
Syncor Syncor International Corporation
The Service Difference
March 23, 1995
U.S. NUCLEAR REGULATORY COMMISSION
Document Control Desk
11555 Rockville Pike
Rockville, MD 20852-2738
RE: NRC Event #28561 - Written Report pursuant to 10 CFR 30.50(c)(2)
Dear NRC Representative:
Enclosed is a written follow-up to NRC Event #28561 which was reported to
Mr. McGinty at the NRC Operations Center on March 20, 1995. The reported
event was a fume hood failure at Syncor's Swartz Creek, MI,
radiopharmacy, NRC License #21-21141-01MD.
Following is a summary of events surrounding the failure of Swartz
Creek's main fume hood on March 20, 1995. All times are Pacific Time
unless otherwise specified:
2300 Swartz Creek's pharmacy manager, Bill Thompson, noticed that
3/19/95 the fume hood was not running at 2 AM (Eastern Time).
0530 Bill Thompson located an available electrician to repair the
3/20/95 fume hood. The electrician determined that a new motor was
needed and the appropriate equipment was ordered.
0830 Tara Domiter (Health Physicist, Chatsworth, CA) returned Bill
Thompson's phone mail message. Mr. Thompson informed Tara that
his fume hood was down. He explained that it was not
functioning when he arrived for work at approximately 2 AM
(Eastern Time) on March 20, 1995. There were approximately 52
mCi of xenon-133 and 300 mCi of iodine-131 on hand in the
pharmacy at the time. Tara Domiter advised Mr. Thompson to
shift to a daily air sampling frequency pending resolution.
Based on air sampling results, the average restricted area air
concentration of iodine-131 over the sampling period (less than
7 days) was less than 1% of the Derived Air Concentration.
Syncor is confident that the restricted area air concentration
did not exceed this amount, since any iodine picked up by the
sample filter and back decayed over half the sampling time
would have exaggerated the effects of a recent release.
The maximum unrestricted area iodine-131 air concentration was
approximately 436% of the effluent release limit over the
sampling period from 3/16/95 to 3/21/95. Syncor is confident
that the unrestricted area air concentration did not exceed
this amount, since any iodine picked up by the sample filter
and back decayed over half the sampling time would have
exaggerated the effects of a recent release. When averaged
over one year, this value would be well below the annual
Effluent Limit. The maximum iodine-131 air concentration
decreased to approximately 25% of the effluent release limit on
20001 Prairie Street o Chatsworth, CA o 91311 o (818) 886-7400
Based on the xenon-133 inventory and assuming that the fume
hood was down for about 37 hours:
However, this room has a supply vent rated at 100 CFM.
Revising the calculations based on this flow rate:
Since the supply vent is rated at 100 CFM of air flow in the
room, the air concentration of xenon-133 in both the restricted
and unrestricted areas is negligible.
1346 Tara Domiter phoned the NRC Operations Center to report the
incident, and made a report to Mr. McGinty (Event #28561).
1215 A new motor was installed and the fume hood has been operating
3/21/95 properly since 3:15 PM (Eastern Time) on March 21, 1995. We
estimate that the fume hood was down for 37 hours.
If you have any questions or require additional information, please
contact Tara Domiter at 800/999-9098, X-4615. Thank you for your time
SYNCOR INTERNATIONAL CORPORATION
Katherine Seifert, R.Ph., BCNP
Corporate Radiation Safety Officer
cc: Bill Thompson, R.Ph., Manager, Swartz Creek, MI
Materials Inspection Section Chief, USNRC Region III, Lisle, IL
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