Diablo Canyon response:
1) Yes. We have both DMC2000 and 3000 in service. We use dose and rate
warnings and alarms.
2) We have used them for years. They served as a tool early on, but now most
key indicators are based off the warning levels.
3) N/A
4) Yes we do and I urge everyone to evaluate it for your site. Please see our
OE in INPO IER L3 13-12. For those that have asked, latching is the feature
that causes a rate alarm to not clear even when the person goes to an area of
lower dose rates. During fuel inspections in the FHB we got a bundle too close
to an empty transfer canal. We had AMPs on the bridge crane. All EDs and the
AMPs went into alarm. The bridge operator recognized the cause and immediately
move the bridge crane away from the empty transfer canal. This caused all
devices to go out of alarm. Because of the noise made by the AMPs they never
heard the EDs alarm. The AMPs did not see much more than 300 mrem/hr. Work
continued for a bit of time. When they exited the RCA the fuel handler
spotting the bundle had an ED dose rate of approximately 2500 mrem/hr. One of
the actions coming out of the investigation and root cause for this event was
to latch dose rates. We now keep a small number of unlatched EDs for
conditions that warrant it. Our wish to MG is that we could control latching
on the alert just as you can on the alarm.
5) Sentinel V1.11.01
6) Contact me for further information.
Thanks,
Linda
Linda M. Sewell, CHP
Principal Health Physicist
Pacific Gas & Electric Company
Diablo Canyon Power Plant
MS 119/1/117
PO Box 56
Avila Beach, CA 93424
P: 805.545.4315 | F: 805.545.2618| [email protected]<mailto:[email protected]>
From: [email protected] [mailto:[email protected]] On Behalf Of
Bradley A Krupp
Sent: Tuesday, April 01, 2014 4:44 AM
To: [email protected]
Cc: Adam C Horne; Benjy P Bertossi
Subject: Powernet: ED warning alarms and latching rate alarm
Fermi 2 would like feed back from our industry peers on the following:
1. Do you use the dose and/or rate alarm warnings available with the
DMC2000/DMC 3000?
2. If you do, why and what issues have you had?
3. If you don't, why not?
4. Do you use the rate alarm latching feature?
5. What access control software do you use and what version is it?
6. Please provide a contact for additional information.
Thanks in advance for your assistance.
Brad Krupp
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