<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1256">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Aptos;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:12.0pt;
font-family:"Aptos",sans-serif;
mso-ligatures:standardcontextual;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#467886;
text-decoration:underline;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0cm;
margin-right:0cm;
margin-bottom:0cm;
margin-left:36.0pt;
font-size:12.0pt;
font-family:"Aptos",sans-serif;
mso-ligatures:standardcontextual;}
span.EmailStyle23
{mso-style-type:personal-reply;
font-family:"Aptos",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
mso-ligatures:none;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:460881479;
mso-list-type:hybrid;
mso-list-template-ids:295205878 410519698 134807555 134807557 134807553 134807555 134807557 134807553 134807555 134807557;}
@list l0:level1
{mso-level-start-at:0;
mso-level-number-format:bullet;
mso-level-text:-;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Aptos",sans-serif;
mso-fareast-font-family:Aptos;
mso-bidi-font-family:"Times New Roman";}
@list l0:level2
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level3
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
@list l0:level4
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Symbol;}
@list l0:level5
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level6
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
@list l0:level7
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Symbol;}
@list l0:level8
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level9
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
@list l1
{mso-list-id:534123020;
mso-list-template-ids:247470896;}
@list l1:level1
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:36.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Symbol;}
@list l1:level2
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:72.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:"Courier New";
mso-bidi-font-family:"Times New Roman";}
@list l1:level3
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:108.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l1:level4
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:144.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l1:level5
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:180.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l1:level6
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:216.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l1:level7
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:252.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l1:level8
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:288.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l1:level9
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:324.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
--></style>
</head><body lang="EN-GB" link="#467886" vlink="#96607D" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Hi Mike,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">We found on dry fuel cask cleaning (Holtec HI-TRAC) and cavity wall plus floor cleaning that pressure washer sprays were not enough, we needed to agitate or scrub the surface. We
clean our cavity walls up to 9 feet, all floors.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Our equipment of choice looks very similar to what Joe has posted below:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo2"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Pressure washer lance heads topped by rotating hinged nylon brushes. We buy about 10-15 of these for an outage. Price is about
$60 each (UK price shown), company is Nilfisk. Operational Experience is to secure the couplings with a suitable bonding agent (e.g. Loc-Tite) and to teach the teams to start the pressure washer spray and brush rotation away from the wall, floor or cask surface,
then move the brush to the surface. Excellent decon factor.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:none;mso-fareast-language:EN-US"><img width="289" height="213" style="width:3.0138in;height:2.2152in" id="_x0000_i1029" src="cid:image001.png@01DC4F1D.1F0ACE40"></span><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo2"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Floor cleaners identical to Joe\u2019s post but using the rotating pressure washer heads and brush surface. Good for large areas,
we have several different sizes because of the floor furniture (cavity blanks, ISI gallery covers, etc). We have some wall cleaners like this and are experimenting the best option between the brushes noted above and the larger surface area cleaner. Combination
has definitely reduced cleaning time and dose over the years. Units couple to the standard pressure washer lance and have two rotating spray heads underneath.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:none;mso-fareast-language:EN-US"><img width="353" height="222" style="width:3.6736in;height:2.3125in" id="_x0000_i1028" src="cid:image002.png@01DC4F1D.5FC00D60"></span><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Richard<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#FF6F18;mso-ligatures:none">Richard Parlone</span></b><span style="font-size:10.5pt;color:black;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#04488D;mso-ligatures:none">Head of Radiological Protection<br>
</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#04488D;mso-ligatures:none">Technical & Safety Support Department<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#04488D;mso-ligatures:none">EDF Nuclear Operations<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-ligatures:none">Sizewell B Power Station, Suffolk, United Kingdom IP16 4UR</span><span style="font-size:11.0pt;color:#1F497D;mso-ligatures:none"><br>
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#7F7F7F;mso-ligatures:none">T:<b>
</b>(+44) (0)1728 65 3750 (Internal 718 3750)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">Proud Sponsors of Alzheimer\u2019s Society<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:none"><img width="188" height="71" style="width:1.9583in;height:.743in" id="x_Picture_x0020_3" src="cid:image004.jpg@01DC4F1D.1F0ACE40" alt="7BE33704"></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal" style="vertical-align:baseline"><span style="font-size:11.0pt;mso-ligatures:none"><a href="https://www.alzheimers.org.uk/" target="_blank"><span style="color:blue">https://www.alzheimers.org.uk/</span></a><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none"> Global <global-bounces@list.rpalara.org>
<b>On Behalf Of </b>Coughlin, Joseph J: (Constellation Nuclear) via Global<br>
<b>Sent:</b> 06 November 2025 11:58<br>
<b>To:</b> Michael J Griffin <mjgriffin@aep.com>; global@list.rpalara.org<br>
<b>Subject:</b> Re: [Global] [EXTERNAL] Request for Recommendations \u2013 Cavity Decontamination Equipment and Techniques<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Morning Mike,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">We use a similar pressure washer but have a rotary spray surface cleaner attachment to use vs traditional standard tip. This is not exact one we use but similar. Takes some force to hold to walls
but gets a lot more surface area then just the tip. Hope this helps\u2026\u2026\u2026Thx Joe<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:none"><img border="0" width="1316" height="798" style="width:13.7083in;height:8.3125in" id="_x0000_i1026" src="cid:image005.png@01DC4F1D.1F0ACE40"></span><span lang="EN-US" style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none"> Global <<a href="mailto:global-bounces@list.rpalara.org">global-bounces@list.rpalara.org</a>>
<b>On Behalf Of </b>Michael J Griffin via Global<br>
<b>Sent:</b> Tuesday, November 4, 2025 2:22 PM<br>
<b>To:</b> <a href="mailto:global@list.rpalara.org">global@list.rpalara.org</a><br>
<b>Subject:</b> [EXTERNAL][Global] Request for Recommendations \u2013 Cavity Decontamination Equipment and Techniques<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p><span lang="EN-US"> <o:p></o:p></span></p>
<table class="MsoNormalTable" border="0" cellspacing="3" cellpadding="0" style="background:black">
<tbody>
<tr>
<td width="654" style="width:490.5pt;background:red;padding:.75pt .75pt .75pt .75pt">
<p><em><b><span style="font-family:"Aptos",sans-serif;color:yellow">EXTERNAL MAIL. Do not click links or open attachments from unknown senders or unexpected Email.</span></b></em><o:p></o:p></p>
</td>
</tr>
</tbody>
</table>
<p><span lang="EN-US"> <o:p></o:p></span></p>
<div>
<p><strong><span lang="EN-US" style="font-family:"Aptos",sans-serif">Subject: Request for Recommendations \u2013 Cavity Decontamination Equipment and Techniques</span></strong><span lang="EN-US"><o:p></o:p></span></p>
<p><span lang="EN-US">We are currently evaluating opportunities to enhance the efficiency and effectiveness of our cavity decontamination process. At present, we utilize a 3500 PSI pressure washer with a standard tip to decon the cavity walls and floor. For
optimal performance, the tip must be positioned within 2 inches of the surface; otherwise, multiple passes (typically 4\u20136) are required to achieve acceptable results.<o:p></o:p></span></p>
<p><span lang="EN-US">This limitation significantly impacts productivity, particularly when cleaning vertical surfaces up to 6 feet high and approximately 60 feet in length, which can take several hours. Additionally, the cavity floor presents challenges due
to the presence of NI detector covers and nozzle access covers, which are elevated several inches above the main floor. These obstructions prevent the use of conventional floor-cleaning equipment such as buffers or scrubbers.<o:p></o:p></span></p>
<p><span lang="EN-US">We are seeking input from other sites or teams regarding equipment, pressure washer tips, and attachments that have proven effective in similar conditions. Our goal is to improve decon efficiency, reduce time, and minimize dose.<o:p></o:p></span></p>
<p><span lang="EN-US">Any recommendations or lessons learned would be greatly appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="margin-left:10.8pt;border-collapse:collapse">
<tbody>
<tr style="height:54.15pt">
<td width="138" valign="top" style="width:103.8pt;border:none;border-right:solid red 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:54.15pt">
<p class="MsoNormal" style="line-height:105%"><span style="font-size:10.0pt;line-height:105%;color:#1F497D;mso-ligatures:none"><img border="0" width="124" height="82" style="width:1.2916in;height:.8541in" id="Picture_x0020_1" src="cid:image006.png@01DC4F1D.1F0ACE40"></span><span style="font-size:10.0pt;line-height:105%;color:#1F497D;mso-ligatures:none"><o:p></o:p></span></p>
</td>
<td width="479" style="width:358.95pt;padding:0cm 5.4pt 0cm 5.4pt;height:54.15pt">
<p class="MsoNormal" style="line-height:105%"><b><span style="font-size:9.5pt;line-height:105%;font-family:"Arial",sans-serif;color:#C00000;text-transform:uppercase">Michael J. Griffin</span></b><span style="font-size:9.5pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D;text-transform:uppercase">
</span><span style="font-size:9.5pt;line-height:105%;font-family:"Arial",sans-serif;color:#595959;text-transform:uppercase">|
</span><b><span style="font-size:9.5pt;line-height:105%;font-family:"Arial",sans-serif;color:black;text-transform:uppercase">ALARA planner</span></b><b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:gray;text-transform:uppercase">
</span></b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:gray;text-transform:uppercase"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="font-size:8.5pt;line-height:105%;font-family:"Arial",sans-serif;text-transform:uppercase"><a href="mailto:mjgriffin@aep.com"><span style="color:#0563C1">mjgriffin@aep.com</span></a><span style="color:gray">
| </span></span><span style="font-size:8.5pt;line-height:105%;font-family:"Arial",sans-serif;color:gray"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="font-size:8.5pt;line-height:105%;font-family:"Arial",sans-serif;color:#404040;text-transform:uppercase">cook nuclear plant<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="font-size:8.5pt;line-height:105%;font-family:"Arial",sans-serif;color:#404040;text-transform:uppercase">1 Cook place, Bridgman, MI 49106
<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="font-size:8.5pt;line-height:105%;font-family:"Arial",sans-serif;color:#404040;text-transform:uppercase">| 269-465-5901 *7547 | cell 269-449-2437</span><span style="font-size:8.5pt;line-height:105%;font-family:"Arial",sans-serif;color:gray;text-transform:uppercase"><o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Times New Roman",serif;mso-ligatures:none">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 <o:p></o:p></span></p>
</div>
<br><br>
<p style="font-family:Arial;font-size:14px">
This e-mail, and any attachments, is confidential and for the use of the addressee only. If you are not the intended recipient, please telephone +44 (0) 1355 846000. We do not accept legal responsibility for this e-mail or any viruses. All e-mails sent and received by us are monitored. Contracts cannot be concluded with us by e-mail.<br>
<br>This message has been sent from EDF Energy Nuclear Generation Ltd, a company registered in England and Wales No. 03076445, with registered office at Javelin House, Building 1420 Charlton Court, Gloucester Business Park, Gloucester GL3 4AE. </p></body></html>