Shari, Here are the answers for STP. Our guidance is based on SOER 01-1 Rec 6b which recommends stay time tracking at 1500 mrem/hr OR 500 mrem per entry.
Additionally, INPO Tier 3 document NISP-RP-10 (Radiological Job Coverage)
states:
3.4 Track Stay Time
3.4.1 Establish and track the stay time of workers if any one of the following
conditions exists.
a. Work area dose rates exceed 1,500 mrem per hour (deep dose
equivalent).
b. A worker's dose for a single entry into the work area is
expected to exceed 500 mrem.
c. As otherwise required by the RWP or ALARA Plan.
3.4.2 Use Attachment 2, Stay Time Log (or equivalent) to track stay times.
a. Manually track stay times when required even if telemetry is in
use.
b. Ensure direct communications with (or to) workers are in place
to enable timely intervention
when stay times are approached or exceeded.
3.4.3 The technician tracking stay time shall provide continuous attention to
stay time tracking and
have no other duties with the following exception:
a. A technician may use Attachment 2 to track stay time while
performing remote
monitoring/telemetry to control individual doses.
3.4.4 Instruct workers to exit the area before the dose limit is exceeded,
allowing sufficient time to
place the work area in a safe condition.
3.4.5 Instruct workers to relocate to a low dose rate area before exceeding
stay times if an evaluation
is needed for a stay time extension.
a. Allow sufficient time to place the work area in a safe condition.
3.4.6 Ensure any extension of a stay time is documented and approved by RP
supervision in compliance with the following:
a. Personnel are moved to a low dose area while the stay time
extension is evaluated.
b. The initial stay time has not been exceeded.
c. Accumulated dose is less than 80% of the SRD dose setpoint.
d. Radiological conditions are stable.
e. RP supervision has reviewed work scope, effective dose rates,
and the remaining margin to
the SRD dose setpoint.
f. The revised stay time will not result in exceeding the SRD dose
setpoint and still enable
placing equipment in a safe condition prior to exiting the area.
g. Workers have been briefed on the revised stay time requirement.
h. Approval for the extension is documented on Attachment 2.
Let me know if you have any additional questions.
Matthew Pilgreen
Technical Support Supervisor
Health Physics
South Texas Project NOC
(361) 972-7138
[email protected]
From: Mosty, Shari [mailto:[email protected]]
Sent: Tuesday, January 09, 2018 3:16 PM
To: [email protected]
Subject: [powernet] Stay Time Tracking
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Comanche Peak would like to know how other stations perform stay time tracking.
Attached is a short questionnaire to find out what other plants are doing when
entering a non-uniform LHRA.
Appreciate any info.
Thanks
Shari Mosty
Sr. Health Physicist
Comanche Peak Nuclear Power Plant
6322 N. FM 56
Glen Rose, Texas 76043
254.897.5204
[email protected]<mailto:[email protected]>
Stay Time Tracking Survey.docx
Description: Stay Time Tracking Survey.docx
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