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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Morning Krystyn,<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">For Sizewell B (4 loop Westinghouse SNUPPS, 1200 MWe), we have 2 planned Containment Entries at Power in an 18 month operating cycle, and normally allow dose in the annual plan for
one emergent entry.<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">The planned entries include a Tech Spec surveillance programme boric acid walkdown of accessible annulus areas and access to our Flux Mapping Platform and Pressuriser Cell (VHRA
areas). This is the highest dose activity. Also included is the collection of a reactor leak-off sample and some other sundry routines. Entrants are issued with Thermo EPD-N2s which are our “legal record” dosimeters for neutron and gamma.<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 typically plan for 2 person.millisieverts (200 person.mrem) of neutron and gamma dose when scoping the annual dose budget a year in advance, based upon “expected” activities.
The last entry in September 2025 was delivered for 1.3 p.mSv (130 p.mrem). Our annual dose for 2025 to date is 2.176 p.mSv (~220 p.mrem) for two entries.<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">There is a justification flow chart to include other work in a planned entry, which I have attached. Basically it reflects whether there is a significant nuclear safety impact to
the work, or work is needed to prevent a reactor trip or power reduction and whether the work can be performed in an outage.<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">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>
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<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’s 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:.7395in" id="x_Picture_x0020_3" src="cid:image001.jpg@01DC53AB.DA11E0B0" 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>
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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<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>Kono, Krystyn M via Global<br>
<b>Sent:</b> 11 November 2025 15:33<br>
<b>To:</b> 'global@list.rpalara.org' <global@list.rpalara.org><br>
<b>Subject:</b> [Global] Work in CTMT at Power<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">What is your yearly dose for work in CTMT at Power? What is the criteria for work in CTMT at power to be worked?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN" style="font-size:11.0pt;font-family:72;color:black">Krystyn Gowdy Kono</span></b><b><span lang="EN" style="font-size:11.0pt;font-family:72;color:#CC0000"><br>
</span></b><b><i><span lang="EN" style="font-size:14.0pt;font-family:72;color:red">X</span></i></b><b><i><span lang="EN" style="font-size:11.0pt;font-family:72;color:black">cel Energy</span></i></b><b><span lang="EN" style="font-size:11.0pt;font-family:72;color:black">
</span></b><span lang="EN" style="font-size:11.0pt;font-family:72;color:#666666"><br>
</span><b><span lang="EN" style="font-size:11.0pt;font-family:72;color:#595959">Radiation Protection - ALARA Foreperson</span></b><span lang="EN" style="font-size:11.0pt;font-family:72;color:#595959"><br>
<b><i>Prairie Island Nuclear Generating Plant<o:p></o:p></i></b></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><span lang="EN" style="font-size:11.0pt;font-family:72;color:#595959">1717 Wakonade Dr, Welch, MN 55089<br>
<b>P:</b> 651-267-6556 </span><span lang="EN" style="font-size:11.0pt;font-family:72;color:#666666"><br>
</span><b><span lang="EN" style="font-size:11.0pt;font-family:72;color:#595959">E:</span></b><span lang="EN" style="font-size:11.0pt;font-family:72;color:#595959">
</span><u><span lang="EN" style="font-size:11.0pt;font-family:72;color:blue"><a href="mailto:krystyn.kono@xcelenergy.com"><span style="color:#0563C1">krystyn.kono@xcelenergy.com</span></a></span></u><b><span lang="EN-US" style="font-family:"Times New Roman",serif"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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