[Global] Question on cask shielding

[Parlone Richard]

[Classification: NOT PROTECTIVELY MARKED]
Hi Kevin,

We use tungsten impregnated Silflex shielding for our Holtec HI-TRAC cask work:


-          Shield bell, tungsten/neutron blankets hung on a circular ring on a support stand in the low dose rate are, then lifted to the top of the HI-TRAC

-          MPC lid "pizza slices" with tungsten/neutron shielding to put over the annulus, neutron only for the centre of the lid

-          Silflex tungsten/neutron blankets for the top of our MPC when a person needs to step over the annulus onto the MPC lid to remove the MPC lifting trunnion bolts

We have tungsten T-Flex "snakes" based upon the Braidwood design for our MPC annulus area, very effective. These are from NPO.

We also use standard high temp lead wool blankets to move around when needed to support work over the MPC/HI-TRAC; we do additional tasks compared to standard MPCs including lid to shell milling and UT of the LTS weld.

All shielding is shown here: https://www.isoe-network.net/docs/symposium-proceedings-classification/job-experiences/dry-cask-storage-1/4012-parlone2018-ppt-2/file.html

And I can make an ALARA report with the shielding effectiveness available to you if you wish.

Best regards,
Richard

Richard Parlone
Head of Radiological Protection
Technical & Safety Department

EDF Energy Generation
Sizewell B Power Station, Nr. Leiston, Suffolk, IP16 4UR
Tel - (+44) 01728 653750 Internal - 718 3750
richard.parlone at edf-energy.com<mailto:richard.parlone at edf-energy.com>
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From: Global <global-bounces at list.rpalara.org> On Behalf Of kevin.licklider at dominionenergy.com
Sent: 31 May 2022 17:05
To: global at list.rpalara.org
Subject: [Global] Question

This Message originated outside your organisation.
________________________________
Hello all,
Anyone use silflex shielding for their dry cask storage preferably in the annulus region?  Snakes or wedges type shielding ?  Tungsten or lead impregnated ?
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