[Global] [EXTERNAL] Reactor Vessel flange cleaning

[Coughlin, Joseph J:(Constellation Nuclear)]

Kevin,

We at Braidwood do similar to you. Prior to drain down we have an underwater flange cleaner that is used. Not sure of make as is vendor supplied. During drain down we will stop the head at about 6ft off flange and use water lances to spray the flange again. The go to 18" and enter to inspect and do final clean as needed. Any questions let me know......Thx Joe

From: Global <global-bounces at list.rpalara.org> On Behalf Of kevin.licklider--- via Global
Sent: Thursday, June 8, 2023 1:31 PM
To: global at list.rpalara.org
Subject: [EXTERNAL][Global] Reactor Vessel flange cleaning




EXTERNAL MAIL. Do not click links or open attachments from unknown senders or unexpected Email.


Good Moring All,
I hope everyone is finished with their outage, 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

PS
Thanks for the replies already from Seabrook, Braidwood, Sequoyah and Watts Bar on this matter.


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

CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
This Email message and any attachment may contain information that is proprietary, legally privileged, confidential and/or subject to copyright belonging to Constellation Energy Corporation or its affiliates ("Constellation"). This Email is intended solely for the use of the person(s) to which it is addressed. If you are not an intended recipient, or the employee or agent responsible for delivery of this Email to the intended recipient(s), you are hereby notified that any dissemination, distribution or copying of this Email is strictly prohibited. If you have received this message in error, please immediately notify the sender and permanently delete this Email and any copies. Constellation policies expressly prohibit employees from making defamatory or offensive statements and infringing any copyright or any other legal right by Email communication. Constellation will not accept any liability in respect of such communications. -CEGIP
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.rpalara.org/pipermail/global_list.rpalara.org/attachments/20230608/6fc1d94b/attachment.html>