[Global] Containment entries while maneuvering power PWR

[Hertz, John-Joseph Michael]

SQN has a similar situation to DC Cook. Entering Upper Containment (where we have the Polar Crane) is easy peasy because dose rates are only 5-10 mrem/hr and the Polar Crane dose rates are <1 mrem/hr.

We only enter Lower Containment where dose rates are several REM/hr if there is an serious risk to plant equipment and the entry will be a quick check. We have not done an at power entry into Lower Containment in several years.

Thanks,
John Hertz
Radiation Protection / ALARA

Desk: 423-843-6875   Cell: 808-366-0072   Email: jjhertz at tva.gov<mailto:jjhertz at tva.gov>
Sequoyah Nuclear Plant
[TVA logo]
2600 Sequoyah Access Rd, Soddy-Daisy, TN 37379

From: Global <global-bounces at list.rpalara.org> On Behalf Of Mike McLean via Global
Sent: Wednesday, March 1, 2023 2:18 PM
To: Williams, Michelle Lewis <MIWILLIA at southernco.com>; global at list.rpalara.org
Subject: Re: [Global] Containment entries while maneuvering power PWR

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Cook doesn’t have any issue doing or polar crane PM’s due to being an ICE plant.
However we do have requirements for entering containment inside our bio shield wall >10% power.
This would require a special RWP, ALARA plan and Full ALARA committee approval.
Thanks Mike

Mike McLean
Radiation Protection
General Supervisor
ALARA / Projects

From: Global <global-bounces at list.rpalara.org<mailto:global-bounces at list.rpalara.org>> On Behalf Of Williams, Michelle Lewis
Sent: Wednesday, March 1, 2023 1:41 PM
To: global at list.rpalara.org<mailto:global at list.rpalara.org>
Subject: [EXTERNAL] [Global] Containment entries while maneuvering power PWR

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Good afternoon,
Recently I was challenged with allowing access into our U1 Containment Building to perform polar crane PM’s to gain time for mobilizing equipment into containment. The entry would be made around 50% power and then lowering power ~ 5 % every hour until we trip the reactor at 20% power. I know Farley has in their procedure that entries into containment is not allowed while maneuvering power up or down at 3% or greater. I was wondering if any other utility had procedural restrictions on entering containment at power and if so can you share that with me? I was able to present to the ALARA committee details I had from Salem and Diablo Canyon as well as the information I got for those who attended the Winter RP ALARA meeting. The committee voted no on going in to do this activity. I need to put a bow on it so I am not challenged on this again. Thanks in advance!

Michelle Williams
Radiation Protection Manager
Vogtle 1&2
miwillia at southernco.com<mailto:miwillia at southernco.com>
cell 919.770.7138
office 706.848.4236
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