ML19298A955

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License Amendment Request for a Revision to the Dose Consequence Analysis for a Loss of Coolant Accident - Pre-Application Meeting, October 29, 2019
ML19298A955
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 10/29/2019
From: Sujata Goetz
Plant Licensing Branch 1
To: Cimorelli K
Susquehanna
Goetz S
References
Download: ML19298A955 (8)


Text

Susquehanna Steam Electric Station License Amendment Request for a Revision to the Dose Consequence Analysis for a Loss of Coolant Accident Pre-Application Meeting October 29, 2019

Meeting Purpose

  • Describe a future license amendment request
  • Establish a common understanding of the scope of the request
  • Establish a common understanding of the schedule
  • Obtain NRC feedback

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Proposed Changes to Analysis

  • Upgrade to ORIGEN-ARP for source term
  • Increase assumed CRHE inleakage
  • Eliminate CRHE continuous occupancy areas to align with RG 1.183
  • Upgrade to RADTRAD Version 3.10

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Impacted Parameters Parameter Existing DBA LOCA AOR RB Inleakage 140%/day (4041.1 cfm)

SGTS Flow Rate 11,110 cfm (first 10 minutes) and 4041.1 cfm thereafter ESF Leakage into RB 20 gpm (2.674 cfm)

CRHE Unfiltered Air Inleakage 500 cfm Continuous occupancy locations Elevation 741-1 (all)

Elevation 729 (all)

Elevation 698 (Computer Room)

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Continuous Occupancy Assumptions Current Assumptions Revised Assumptions

  • Elevation 741-1
  • Elevation 741-1

- All Areas - Technical Support Center Only

  • Elevation 729
  • Elevation 729

- All Areas - Control Room Only

  • Elevation 698
  • Elevation 698

- Computer Room Only - Computer Room Only

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Aggregate Dose Impacts Post-LOCA Existing DBA LOCA AOR Regulatory Limit

  • Control room dose will Dose Type (Rem TEDE) (Rem TEDE) decrease Control Room 4.69 5 (30 Day)
  • EAB dose will increase EAB (Worst 12.0 25 - Remains below Case 2 Hour) regulatory limit LPZ (30 Day) 4.53 25
  • LPZ dose will decrease

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Summary

  • Change in method
  • Multiple changes to assumptions/inputs
  • Minor impacts to TS and TS Bases
  • Required to support fuel loading in spring 2021

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List of Acronyms AOR - Analysis of Record LPZ - Low Population Zone CR - Control Room MSIV - Main Steam Isolation Valve CRHE - Control Room Habitability RB - Reactor Building Envelope DBA - Design Basis Accident RG - Regulatory Guide EAB - Exclusion Area Boundary SGTS - Standby Gas Treatment System ESF - Emergency Safety Feature TEDE - Total Effective Dose Equivalent LOCA - Loss of Coolant Accident TS - Technical Specifications

© Talen Energy 8