Columbia provides the following response.
1. Do you use standard dose and rate alarms or are each RWP/Task set points
evaluated individually?
We do not set dose and dose rate alarm set points at the task level. They are
set at the RWP level.
* Give examples of the EAD set points for General or Standing RWPs for
RP, Chemistry, Maintenance, and Operations.
HP RWP for pre job surveys, 100mrem, 500mrem/hr. Chemistry RWP non HR 10mrem,
80mrem/hr. Operations Non HR 10mrem, 80mrem/hr, HR 100mrem, 500mrem/hr, LHRA
150mrem, 800mrem/hr.
1. How many alarms for dose, rate and clock are received in a typical
non-outage year?
In 2010 we had 4 unanticipated dose rate alarms and 1 dose alarm. We do not
track clock alarms.
* What is your response to an EAD alarm?
For dose and dose rate alarms the workers are required to put their work in a
safe condition and report to Health Physics. HP will then investigate the cause
of the alarm. All alarms are documented in the HP electronic logbook and a
Condition Report (CR) is initiated.
* If you allow workers to work through anticipated dose rate alarms, how
is the alarm documented?
Workers are not allowed to work through dose rate alarms. If they cannot
correct the condition which caused the alarm immediately they are required to
leave the area.
Do you allow any work group(s) to remain logged on an RWP all shift or do you
require all workers to log off the RWP on each exit from the RCA?
Only HP, Chemistry, Operations and Security, for alarm response, are allowed to
remain logged in. All other work groups are required to log out immediately
after exiting the RCA.
From: [email protected] [mailto:[email protected]] On Behalf Of
RICKETTS, BOBBY R G
Sent: Thursday, February 24, 2011 12:45 PM
To: [email protected]
Subject: Powernet: EAD Alarm Set Points and Actions
Grand Gulf Nuclear Station requests information on how other stations set up
their electronic alarming dosimeters alarm set points for dose, dose rate, and
clock alarms (allowed time to be logged onto the RWP). The specific areas of
interest are below.
1. Do you use standard dose and rate alarms or are each RWP/Task set points
evaluated individually?
* Give examples of the EAD set points for General or Standing RWPs for
RP, Chemistry, Maintenance, and Operations.
1. How many alarms for dose, rate and clock are received in a typical
non-outage year?
* What is your response to an EAD alarm?
* If you allow workers to work through anticipated dose rate alarms, how
is the alarm documented?
Do you allow any work group(s) to remain logged on an RWP all shift or do you
require all workers to log off the RWP on each exit from the RCA?
Bob Ricketts
GGNS / Entergy
HP Instructor
601-437-2702 ext
8-437-2702 int
