[Global] ISFSI Question on stack up (for vertical storage

[Armstrong, Joel L]

TVA uses the HOLTEC HI-STORM FW system.  Our fuel canister is the MPC-37.  Terminology is a bit different but it is a vertical cask storage system.  Dose rates vary based on the fuel load so the dose accrual will vary as well.  Training and crew proficiency also impact the dose accrual.

For our two PWRs, Sequoyah averaged 101.8 mrem and Watts Bar averaged 69.8 mrem during their most recent loading campaigns.  These dose totals include all the prep work, the actual stackup and transfer of the fuel canister, de-stack activities, and installation of the overpack lid.  The average decay heat at Sequoyah was 31.86 kW and at Watts Bar was 35.47 kW.

We stackup and transfer inside the aux building so these doses do not include transport to the ISFSI.  That is typically small unusually 2-5 mrem.

Joel L Armstrong
ALARA Engineer
TVA Spent Fuel Services
(256)614-6429 Office
(423)280-3417 Mobile

From: Global <global-bounces at list.rpalara.org> On Behalf Of Edelman, Steven K:(Exelon Nuclear)
Sent: Thursday, June 10, 2021 4:11 PM
To: global at list.rpalara.org
Subject: [Global] ISFSI Question on stack up (for vertical storage

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All,

Can anyone supply their dose they receive while performing the tasks associated with the stack up of the  and insertion of the TSC into the VCC? We are preparing to start our first dry cak campaign in the fall and are looking for some experiences and OE.

Thanks


Steve Edelman



NRRPT/ALARA/RPS/Rad Shipper

Phone: (717) 948-8516

Three Mile Island

2625 River Road
Middletown, Pa. 17057



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