Ephraim Schwartz │ Manager │ Health Physics Department
Ontario Power Generation Inc. │ 1549 Victoria Street East, Whitby, Ontario
L1N 9E3
Internal: 402 – 3334 │ External: 905.430.2215 ext. 3334 │ Facsimile:
905.430.8583
Mobile: 416.407.4902
Make every mrem count
From: DUHIG John -NUCLEAR <[email protected]>
Sent: Wednesday, February 22, 2017 7:18 AM
To: SCHWARTZ Ephraim -NUCLEAR
Subject: Powernet question
Hi Ephraim,
Can you ask what other utilities are using for waste bag monitor alarm set
points through use HPS powernet?
INPO provides an example that is lower than our current alarm set points
(2.25nCi vs 10nCi). Based on our MDA, we would be challenged to drop to
2.25nCi without significantly increasing count times. I’m interested how (if
at all) others are achieving this detection limit.
Thanks,
John
INPO 05-008 Rev2 Section 4.f:
f. Unconditional release of clean trash from the radiologically controlled area
Trash is monitored to ensure radioactive material will not be released off
site. This monitoring may be done in a number of ways. For example, use a
gamma-sensitive tool or box monitor capable of detecting contamination within
the bag of trash at a level of 5,000 dpm. Each piece of trash may be surveyed
with a handheld beta-sensitive frisker, rebagged, followed-by performance of an
aggregate survey of the material.
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