[Global] [EXTERNAL] Reactor vessel flange cleaning?

[York, Robert]

Kevin,

Here at Seabrook we use the same process you are using. Head lowered to approx. 24", flanged wiped down with long handled tools.

Rob York
Seabrook ALARA
603-773-7359


From: Global <global-bounces at list.rpalara.org> On Behalf Of Coughlin, Joseph J:(Constellation Nuclear)
Sent: Tuesday, May 2, 2023 9:13 PM
To: kevin.licklider at dominionenergy.com; global at list.rpalara.org
Subject: Re: [Global] [EXTERNAL] Reactor vessel flange cleaning?

Kevin, We do similar to what you do here at Braidwood. However we have a flange cleaner that we do underwater flange cleaning prior to drain down to knock off bulk of corrosion. Then we stop with the
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Kevin,

We do similar to what you do here at Braidwood. However we have a flange cleaner that we do underwater flange cleaning prior to drain down to knock off bulk of corrosion. Then we stop with the head at about 6ft and spray/rinse off flange with spray wands. The flange cleaner we use have had a while came from ROV/Rolls Royce I believe but now contracted thru Westinghouse.........Thx Joe

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Subject: [EXTERNAL][Global] Reactor vessel flange cleaning?




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Good Moring All,
I know it is outage season and everyone is very busy, but I have some questions.

What is your process for cleaning the reactor vessel flange prior to setting the reactor head?  Clean underwater? Employ a flange cleaning tool?
If you use a flange cleaning tool who is the manufacturer

At NAPS we wait until the head is approximately 18" from the flange for shielding and use long handled tools to clean the O-ring grooves.
One unit has experienced a slight inner O-ring leak during power operations ~0.05 gpm.

Thank You in Advance for your reply

Kevin Licklider
North Anna Power Station
ALARA Coordinator
540-894-2873

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