[ RadSafe ] Kr-85

[Bob Hearn]

The charcoal bed trains were commonly installed on the ehxaust from the
steam jet air ejectors of GE BWR's, the exhaust bieng mixed with other more
dilute air streams prior to release.

----- Original Message ----- 
From: <JGinniver at aol.com>
To: <Jim_Hardeman at dnr.state.ga.us>
Cc: <radsafe at radlab.nl>
Sent: Friday, September 23, 2005 2:01 PM
Subject: Re: [ RadSafe ] Kr-85


>
> In a message dated 23/09/2005 15:28:37 GMT Standard Time,
> Jim_Hardeman at dnr.state.ga.us writes:
>
> Due to  the 10.7 yr half-life of Kr-85, noble gas decay doesn't help a
whole
> lot in  minimizing releases of Kr-85, not does it buy you much with
Xe-131m
> (11.8  day), Xe-133 (5.2 day), or Xe-133m (2.2 day). It DOES however, help
to
> minimize releases of Kr-85m (4.5 hr), Kr-87 (76 minutes), Kr-88 (2.8 hr),
> Xe-135 (9.1 hr) and Xe-138 (14 minutes).
>
>
>
> It's been awhile but my recolletion was that the charcoal beds on PWRs
were
> designed to delay the release of noble gases by about 90 days so you will
see
> a  significant reduction in all but the Kr-85.
>
> Regards,
>     Julian
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