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

Thu Jun 10 17:59:52 EDT 2021

Palo Verde uses NAC's MAGNASTOR system:

Dry Cask Storage Collective Radiation Exposure Summary
Palo Verde Generating Station: through 5/31/2021

Description     Unit    Start Date      End Date        Days    kW      RCA Entries     RCA Hours       mrem/Entry      mrem/hour       Total Dose
Fuel Load # 153 3       03/01/20        03/18/20        18      17.1    610     2234    0.10    0.03    0.059
Fuel Load # 154 3       05/11/20        05/20/20        10      17.6    447     1656    0.16    0.04    0.073
Fuel Load # 155 3       05/24/20        06/03/20        11      17.6    368     1348    0.19    0.05    0.071
Fuel Load # 156 3       06/07/20        06/17/20        11      16.6    297     1086    0.24    0.07    0.071
Fuel Load # 157 3       06/17/20        07/01/20        15      16.4    385     1319    0.17    0.05    0.065
Fuel Load # 158 1       08/23/20        09/03/20        12      17.8    410     1618    0.18    0.05    0.075
Fuel Load # 159 1       09/04/20        09/15/20        12      17.9    321     1154    0.24    0.07    0.077
Fuel Load # 160 2       02/08/21        02/16/21        9       18.0    342     1536    0.32    0.07    0.108
Fuel Load # 161 2       03/07/21        03/16/21        10      18.2    295     1151    0.36    0.09    0.105
Fuel Load # 162 2                               19.0
Fuel Load # 163 2                               18.0

James Bungard
Radiation Protection - Radiological Engineering
Palo Verde Generating Station
Work: 623-393-5007
Cell: 602-828-9965

________________________________
From: Global <global-bounces at list.rpalara.org> on behalf of Armstrong, Joel L via Global <global at list.rpalara.org>
Sent: Thursday, June 10, 2021 14:38
To: Edelman, Steven K:(Exelon Nuclear) <Steven.Edelman at exeloncorp.com>; global at list.rpalara.org <global at list.rpalara.org>
Subject: Re: [Global] ISFSI Question on stack up (for vertical storage

***CAUTION***   ***CAUTION***   ***CAUTION***

This e-mail is from an EXTERNAL address (global-bounces at list.rpalara.org). DO NOT click on links or open attachments unless you trust the sender and know the content is safe. If you suspect this message to be phishing, please report it to the APS Cyber Defense Center at ACDC at aps.com.

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

This is an EXTERNAL EMAIL from outside TVA. THINK BEFORE you CLICK links or OPEN attachments. If suspicious, please click the “Report Phishing” button located on the Outlook Toolbar at the top of your screen.

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

This Email message and any attachment may contain information that is proprietary, legally privileged, confidential and/or subject to copyright belonging to Exelon Corporation or its affiliates ("Exelon"). 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. Exelon policies expressly prohibit employees from making defamatory or offensive statements and infringing any copyright or any other legal right by Email communication. Exelon will not accept any liability in respect of such communications. -EXCIP
--- NOTICE ---

This message is for the designated recipient only and may contain confidential, privileged or proprietary information.  If you have received it in error, please notify the sender immediately and delete the original and any copy or printout.  Unintended recipients are prohibited from making any other use of this e-mail.  Although we have taken reasonable precautions to ensure no viruses are present in this e-mail, we accept no liability for any loss or damage arising from the use of this e-mail or attachments, or for any delay or errors or omissions in the contents which result from e-mail transmission.