At one time or another, we’ve had most of the problems listed. The biggest fix
was switching to the LDM-250. That prevented the folks from taking the
dosimeter in the middle of writing to the dosimeter. Far fewer issues since
doing that. Failing the LDM-250, coach folks to take their hands off the
dosimeter until HIS-20 displays the screen that indicates it is done with the
access transaction (there is a small window of opportunity between when the
access transaction is written to the database and the signal is sent to the
dosimeter to turn it on).
Some OE from a previous life: look for any RF interference in the area
anywhere near the LDM to DMC-2000S radio frequency. It is very low power and
all too easy to mess with. Proximity to a CRT monitor is enough. In one case
we wound up putting the readers in a small Faraday cage because the interfering
RF was really powerful and could not be removed. Easy to test this with an
electrically grounded metal box.
Sr. Radiological Engineer
Radiation Protection – Fort Calhoun Station
Omaha Public Power District
9610 Power Lane, Blair, NE 68008
From: BJ Thompson [mailto:bj.thomp...@dominionenergy.com]
Sent: Monday, March 12, 2018 11:55 AM
Cc: Tom Pastor <tom.pas...@dominionenergy.com>
Subject: [powernet] DMC-2000 Question
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North Anna has a question for plants that use Canberra’s HIS-20 software and
DMC-2000 electronic dosimeters.
1. Have you had any occurrence where the DMC-2000 has been found in PAUSE
after being issued in HIS-20?
2. Have you had any occurrence where the DMC-2000 once issued has turned
back to PAUSE without interfacing with a dosimeter reader?
3. Have you had any occurrence with the DMC-2000 losing contact with the
wireless reader during the issuance or return process?
4. Have you had any occurrence during the issue process, the system
issues then quickly returns the dosimeter?
5. If you have answered “yes” to any of these questions – what corrective
measures have you put in place to prevent these events?
Barbara J. Thompson
North Anna Power Station
1022 Haley Drive
Mineral, Va 23117
Superintendent Health Physics Technical Services
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