ML21025A175

License Amendment Request to Adopt TSTF-505 - Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b Pre-Application Meeting, January 26, 2021 (Slides)

ML21025A175
Person / Time
Site:	Susquehanna
Issue date:	01/26/2021
From:	Talen Energy Susquehanna Steam Electric Station
To:	Sujata Goetz NRC/NRR/DORL/LPL1
Goetz S
References
Download: ML21025A175 (10)

Text

Susquehanna Steam Electric Station License Amendment Request to Adopt TSTF-505 Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b Pre-Application Meeting January 26, 2021

Meeting Purpose

• Describe a future license amendment request

- Scope of Request

- Variations from TSTF-505

- PRA Models and CRMP Summary

• Schedule

© Talen Energy 2

Scope of Amendment

• TSTF-505, Revision 2

• RICTs apply to 22 SSES LCOs

• Applicable in Modes 1 and 2

• No Loss of Function Actions

© Talen Energy 3

Variations

• SSES plant-specific RAs not in TSTF-505

• Propose to include TS 3.3.2.1 in RICT Program

• TSTF-505 Conditions/RAs not applicable to SSES

• Administrative Changes

• Cross-reference list for TSTF-505 markups to SSES site-specific TS RAs provided

© Talen Energy 4

TS 3.3.2.1 - Control Rod Block Inst.

• Propose to include Condition A in scope CONDITION REQUIRED ACTION COMPLETION TIME A. One rod block monitor (RBM) channel A.1 Restore RBM channel to OPERABLE status. 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> inoperable.

- Generically excluded per criterion 11

- Conservative surrogate identified

© Talen Energy 5

PRA Technical Adequacy

• Internal Events, Fire, and Flooding Models

- RG 1.200, Revision 2 Peer Review

- Appendix X F&O Closure Review

- 13 F&O Findings remain open

• Internal Events - 1

• Fire - 12

• Internal Flooding - 0

© Talen Energy 6

PRA Technical Adequacy (cont.)

• Seismic

- No Seismic PRA Model

- Seismic penalty will be applied to all RICTs

• Additional LERF penalties will be applied when containment is de-inerted

• Other external hazards

- All other external hazards screen out

© Talen Energy 7

Real-Time Risk Model

• Similar to Maintenance Rule (a)(4) CRMP

- Incorporates RICT/RMAT calculation features

- Incorporates seismic penalty factor

© Talen Energy 8

Schedule

• Submit by end of March 2021

• Requested issuance in April 2022

• Requested implementation period of 180 days and no earlier than August 31, 2022

© Talen Energy 9

List of Acronyms CRMP Configuration Risk Management Program F&O Fact and Observation LCO Limiting Condition for Operation LERF Large Early Release Frequency PRA Probabilistic Risk Assessment RA Required Action RG Regulatory Guide RICT Risk Informed Completion Time RITSTF Risk-Informed Technical Specifications Task Force RMAT Risk Management Action Time SSES Susquehanna Steam Electric Station TS Technical Specifications TSTF Technical Specifications Task Force

© Talen Energy 10