ML20247G619
| ML20247G619 | |
| Person / Time | |
|---|---|
| Issue date: | 11/21/1991 |
| From: | Steven Baggett NRC |
| To: | Nash J FLORIDA, STATE OF |
| Shared Package | |
| ML20247G595 | List: |
| References | |
| SSD, NUDOCS 9805200305 | |
| Download: ML20247G619 (3) | |
Text
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UNITED STATES n
sE NUCLEAR REGULATORY COMMISSION 8
o, WASHINGTON, D.C. 20555 g
November 21, 1991 J.
Daniel Nash Office of Radiation Control State of Florida 1317 Winewood Blvd.
Tallahassee, F1 32399-0700
Dear Mr. Nash:
This refers to your facsimile dated November 19, 1991 requesting review and comment on Vindicator Inc. proposed use of a shroud to reduce the likelihood of product contamination and our phone conversation on November 20, 1991.
The following comments concerning the shroud should be resolved prior to licensing the unit.
- The primary use of a source shroud is to keep product carriers from hitting, trapping or dislodging sources from the rack.
Is the solid thin stainless steel plate designed to withstand the product or a carrier hit without serious damage to the plates or supporting structure.
- Does the heat generated by the sources cause significant thermal expansion of the shroud?
If so, could buckling occur and breakage of the welds holding the shroud together.
- Vindicator and the State will be relying a great deal on Nordion for support.
Have you considered the delay in time before Nordion could arrive at the site in the emergency procedures.
If you have any questions please call me.
My phone number is 301-492-0542.
Sincerely O
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1 Steven ggett Sealed Source Safety Section l
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9805200305 911122
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J. Daniel Nash E ^>
Office of Radiation Control
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State of Florida
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1317 Winewood Blvd.
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Dear Mr. Nash:
/yr This refers to your facsimile dated November 19, 1991 requesting review and co pt on Vindicator Inc. procedures for contamination
/%J detection /
omments are as follows.
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- The primarily use of a source shroud is to keep from hitting and dislodging sources from the rack.
If a solid thin
@f stainless s' teel plate is used 41Twffect-the papcse.** I
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Specifically,)if a carrier / hit the shroud will it dent such that the source rack cannot move to he fully shielded position.
M
- page 4 concerning water sampling.
Sampling from the top of the pool seems inefficient since the water filter system draws from this zone in the pool.
The small particles found near the surface N
would be circulated easily to the filter back and detected by the filter monitor.
I would suggest that a third sample be taken near j
iI the source rack to increase the likelihood that a leaking source s
g would be detected.
- page 5 concernin'g~the air borne contamination.
The audible alarq f 5
is r e p o r t e d - t'o activate the "deionizer monitor" light on flie console. I suggest that'a e indicator light be usedy.A I
- I suggest that the solid shroud be swiped on the surface near the
'N sources at six month intervals.
This would find low levels of t
l contamination before a
meter
- survey, given the background ge variations in;the irradiation cell.
4 Several %
G, I am not a propionate of wipe testing the sources.
fundamental questions arise concerning what you could find. A Especially since you generally do not wipe the weld area, which is i
the most likely leaking area for cobalt sources.
I suggest that'd
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the grab water samples would be in place of this method.j j
Additionally, the wipe of the bottom of the pool is a good ideal 4
and would likely find the heavy particles.
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-I suggest you reconsider the need to stop, product leaving the' facilityj6nbstartTroduc6 contami. nation /sugeys a p for is bq g a
sleakbDtdQ11d be\\ nev4r-alMys-Af ae suspected a leak confirmed and product could alrehdy/ e in the public4 omain.
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- Vindicato p n the State is relying a great deal on Nordion for support.
Have yo onsidered the delay in e before-Nordion coul& arrive at the s in the emer ocedures.
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