In the interest of a rapid turnaround for your question Diablo Canyon answers are:
1) Very similar to what you quote
2) Orex Extremes and Maxair Hood
3) We have been working with hydrogen peroxide addition, but that is beyond the
scope of a quick response.
I am not the contact person but can refer you to someone if more information is
desired.
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
John Sukosky (Generation - 3)
Sent: Friday, March 07, 2014 10:18 AM
To: [email protected]
Subject: Powernet: Do You Allow Workers to Enter Cavity During Rx Head Set
Without Respiratory Protection?
It is probably easier for you to reply via email, but I would enjoy talking
with you.
When we drain the cavity following refueling we typically find contamination
levels exceeding 1,000,000 dpm/100 cm2 and multiple spots >1 rem/hour on
contact. We, therefore, prescribe plastic suits and PAPHs for an HP and SRO to
enter the cavity during reactor head set.
I was challenged to determine why other plants experience contamination levels
< 200,000 dpm/100 cm2 and are able to allow entry into the cavity without
respiratory protection during reactor head set.
1. What are your typical radiological conditions in the cavity during reactor
head set at your station (e.g., contamination levels)
2. What are your station’s requirements for respiratory protection and
protective clothing for workers in the cavity during reactor head set?
3. Also, is there feasibly anything that can be done to improve Surry’s
radiological conditions in the cavity during reactor head set? We do not have
polished cavity surfaces and do not perform ultrasonic cleaning of spent fuel.
A quick response would be greatly appreciated.
Jim Keithley
Sr. Health Physicist
Surry Power Station
(757) 365-2069
(757) 365-0536
[email protected]<mailto:[email protected]>
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