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Re: Area Postings for Beta
Anyone know of a similar reference for DOT? I've always labeled and shipped
based on the sum of all radiations involved. This is particularly necessary
in the case of shipping spent nuclear fuels (which of course not many of you
are doing). Also, the limits expressed in 49CFR173.443 (c) and (d) for
returning vehicles back to service could be greatly affected by beta dose
rates if used. (I have always considered beta when meeting these limits.)
As a note to plant posting, I have also posted some areas around
penetrations based on a sum of neutron and gamma.
Bob Denne
ATG, Richland
----- Original Message -----
From: Ruyter, David S. <David.Ruyter@pseg.com>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Sent: Friday, September 10, 1999 2:54 AM
Subject: RE: Area Postings for Beta
> NRC Question and Answer (Q&A) #74 states that for purposes of posting an
> area, the "dose equivalent" used in the definitions of RA, HRA and VHRA
are
> all considered to be at a tissue depth of 1 cm (1000 mg/cm^2), i.e., DDE.
> Q&A information can be obtained from the NRC Web site:
>
> http://www.nrc.gov/NRC/NMSS/HP/QA/index.html
>
> -----Original Message-----
> From: x [mailto:netngatr@magnolia.net]
> Sent: Friday, September 10, 1999 12:51 AM
> To: Multiple recipients of list
> Subject: Area Postings for Beta
>
>
> This is a multi-part message in MIME format.
>
> ------=_NextPart_000_0022_01BEFB1D.4C14AF80
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> charset="iso-8859-1"
> Content-Transfer-Encoding: quoted-printable
>
> Fellow RADSAFERS,
> =20
> I've searched the RADSAFE archives and can't find exactly what I'm =
> looking for. I know someone out there has the solution, I haven't seen =
> a question yet go unanswered.
>
> I would appreciate any opinions, practices, and references you may have =
> dealing with the posting of areas due to beta radiation where DDE from =
> beta is not a concern.
>
> Assume the only source of radiation is power plant components with mixed =
> fission/corrosion products and no significant gamma contribution to dose =
> rates. The beta energies are low enough that DDE from beta is not =
> significant, documented in past studies.
>
> 1. Do you post 'Radiation Area' signs for those areas that exceed 5 =
> mrem/hr beta @30 cm from the source, or HRA signs for 100 mrem/hr beta =
> @30cm? Since the 10CFR20.1003 definition of RA and dose equivalent do =
> not differentiate between DDE and SDE, it seems clear to me that posting =
> is required.
>
> 2. Assume these high levels of contamination are now wrapped with =
> plastic to preclude requiring protective clothing for handling the item, =
> but >100 mrem/hr beta @30 cm penetrates the plastic. Does anyone use a =
> "Beta High Radiation Area" posting or similar to ensure SDE or extremity =
> monitoring when handling such wrapped items?
>
> 3. Do all of the normal requirements for a HRA entry apply? (Tech Specs =
> similar to RegGuide 8.38)
>
> Thanks for your help,
> Richard Sumrall
> HP Instructor
> Grand Gulf Nuclear Station
> rsumral@entergy.com
>
> My personal questions and musings only, not reviewed or endorsed by my =
> employer.
>
> ------=_NextPart_000_0022_01BEFB1D.4C14AF80
> Content-Type: text/html;
> charset="iso-8859-1"
> Content-Transfer-Encoding: quoted-printable
>
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
> <HTML>
> <HEAD>
>
> <META content=3Dtext/html;charset=3Diso-8859-1 =
> http-equiv=3DContent-Type><!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 =
> HTML//EN">
> <META content=3D'"MSHTML 4.72.3616.1301"' name=3DGENERATOR>
> </HEAD>
> <BODY bgColor=3D#ffffff>
> <DIV><FONT color=3D#000000 size=3D2>Fellow RADSAFERS,</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>I've searched the RADSAFE archives and can't find =
> exactly what=20
> I'm looking for. I know someone out there has the solution, =
> I=20
> haven't seen a question yet go unanswered.</FONT></DIV>
> <DIV><FONT size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>I would appreciate any opinions, practices, and =
> references you=20
> may have dealing with the posting of areas due to beta radiation where =
> DDE from=20
> beta is not a concern.</FONT></DIV>
> <DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV></DIV>
> <DIV><FONT color=3D#000000 size=3D2>
> <DIV><FONT color=3D#000000 size=3D2>Assume the only source of radiation =
> is power=20
> plant components with mixed fission/corrosion products and no =
> significant gamma=20
> contribution to dose rates. The beta energies are low enough that =
> DDE from=20
> beta is not significant, documented in past studies.</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV><FONT color=3D#000000 size=3D2>1. Do you post 'Radiation =
> Area' signs for=20
> those areas that exceed 5 mrem/hr beta @30 cm from the source, or HRA =
> signs for=20
> 100 mrem/hr beta @30cm? Since the 10CFR20.1003 definition of RA =
> and dose=20
> equivalent do not differentiate between DDE and SDE, it</FONT><FONT=20
> color=3D#000000 size=3D2> seems clear to me that posting is =
> required.</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV>2. Assume these high levels of contamination are now wrapped =
> with=20
> plastic to preclude requiring protective clothing for handling the item, =
> but=20
> >100 mrem/hr beta @30 cm penetrates the plastic. Does anyone =
> use a=20
> "Beta High Radiation Area" posting or similar to ensure SDE or =
>
> extremity monitoring when handling such wrapped items?</DIV>
> <DIV></FONT> </DIV>
> <DIV><FONT size=3D2>3. Do all of the normal requirements for a HRA entry =
> apply?=20
> (Tech Specs similar to RegGuide 8.38)</FONT></DIV></DIV>
> <DIV> </DIV>
> <DIV><FONT color=3D#000000 size=3D2>Thanks for your help,</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>Richard Sumrall</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>HP Instructor</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>Grand Gulf Nuclear =
> Station</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2><A=20
> href=3D"mailto:rsumral@entergy.com";>rsumral@entergy.com</A></FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>My personal questions and musings only, not reviewed =
> or=20
> endorsed by my employer.</FONT></DIV></BODY></HTML>
>
> ------=_NextPart_000_0022_01BEFB1D.4C14AF80--
>
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information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html