RE: Ion Chamber

[Glen.Vickers@ucm.com]

As far as the technical bulletin, I believe I there was an NRC IE notice
~90-44.  I have not read the bulletin myself but have read a synopsis from
our corrective actions program.  I believe the problem had to do with a
magnetic switch arm and a reed switch.  The result would be a significant
under-response of the instrument.  This was associated with the rotary range
switch.  I believe some of the models mentioned were the RO-2, RO-20, RSO-5,
and RSO-50.

We have used used the RO-2 for many years and are now starting to go to
RSO-50E models.  The RO-2 models have paid for themselves many times over.
Instruments often get treated a little rough in a power plant environment,
but they seem to have held up well.  I don't have enough data to determine
the durability of the RSO-50E, but it does seem like it should hold up quite
well also.

Sincerely,
Glen Vickers
glen.vickers@ucm.com

	-----Original Message-----
	From:	Steve Frantz [SMTP:sfrantz@aone.com]
	Sent:	Wednesday, March 03, 1999 5:45 PM
	To:	Multiple recipients of list
	Subject:	Ion Chamber

	We're using Eberline RO-2's and have very few problems as long as we
	remember to turn the knob slowly (see technical bulletin) and bake
them
	periodically. The RO-20's may not have the same switch problem.

	We use a lot of Ludlum GM tubes and love them, but I haven't tried
one
	of their ion chambers. Our Model 19 works like a charm.

	We can't keep the Victoreen 450s working. They are mostly in storage
	now.

	My opinion only.

	Stephen Frantz
	Reed College Reactor
	3203 SE Woodstock Blvd.
	Portland, Oregon 97202
	503 777-7222
	fax: 503 777-7274
	mailto: sfrantz@reed.edu



	
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