ML23174A001

Pre-submittal Meeting Slides Regarding Update to the FitzPatrick Fuel Handling Accident Analysis with Impacts to Technical Specifications, June 26, 2023

ML23174A001
Person / Time
Site:	FitzPatrick
Issue date:	06/23/2023
From:	Hasanat A, Staum C Constellation Energy Generation
To:	Division of Operating Reactor Licensing
Poole J
References
Download: ML23174A001 (1)

Text

James A. FitzPatrick License Amendment Request: Pre-submittal Meeting Date: June 26, 2023 Presenter: Abul Hasanat, Christopher Staum Update to the FitzPatrick Fuel Handling Accident Analysis with Impacts to Technical Specifications

• The FitzPatrick Fuel Handling Accident (FHA) analysis is being revised to account for two major changes to support the transition from a Triangular Mast to an NF-500 Mast in 2024.

• These changes would increase dose consequences sufficiently that prior NRC approval is required.

• Changes:

-A single updated radial peaking factor (RPF) for both GNF2 & GNF3 fuel.

-Redefinition of recently irradiated fuel as it relates to Secondary Containment (SC) and Control Room Ventilation (CREVAS) operability.

Proposed Change:

1

Proposed Change (cont.):

• Technical Specification (TS) impacted by way of TS Bases updates:

-Recently Irradiated Fuel definition changing from 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> to 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s:

• TS Table 3.3.6.2, Secondary Containment Isolation Instrumentation, Items #3

& #4: RB Exhaust Radiation & Refueling Floor Exhaust Radiation

• TS 3.6.4.1, Secondary Containment

• TS 3.6.4.2, Secondary Containment Isolation Valves (SCIVs)

• TS 3.6.4.3, Standby Gas Treatment (SGT) System

-Recently Irradiated Fuel definition changing from 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> to 104 hours0.0012 days <br />0.0289 hours <br />1.719577e-4 weeks <br />3.9572e-5 months <br />

• TS 3.3.7.1, CREVAS System Instrumentation

• TS 3.7.3, CREVAS System

• TS 3.7.4, Control Room Air Conditioning (AC) System

• TS 3.8.2, Electrical Power Systems/AC Sources Shutdown

• TS 3.8.5, Electrical Power Systems/DC Sources Shutdown

• TS 3.8.8, Electrical Power Systems/Distribution Systems-Shutdown 2

FitzPatrick FHA Licensing Basis History

• FitzPatrick FHA analysis implemented 10 CFR 50.67 Accident Source Term in 2002 (ML022350228).

• JAF-CALC-RAD-04410, Rev. 1

• FitzPatrick FHA analysis further updated with two revisions by way of 10 CFR 50.59 Screening and Evaluation.

• JAF-CALC-RAD-04410, Rev. 2 (2018) utilized higher RPF with the fuel (GNF2) in use at that time.

• JAF-CALC-RAD-04410, Rev. 3 (2021) incorporated new GNF3 fuel type.

3

Dose Analysis Updates:

Existing FitzPatrick FHA analysis (JAF-CALC-RAD-04410, Rev. 3) models:

Both the Triangular Mast & NF-500 Mast with differing RPF Both GNF2 & GNF3 Fuel with differing RPF No credit for CREVAS Credit for SC from 0 - 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> post reactor shutdown.

Requires automatic action within 2 minutes.

4 0 - 96 Hours Control Room EAB LPZ Dose 1.95 2.72 0.304 Limit 5

6.3 6.3

>96 Hours Control Room EAB LPZ Dose 4.68 2.74 0.306 Limit 5

6.3 6.3

Dose Analysis Updates (cont.):

Revised FitzPatrick FHA analysis (JAF-CALC-RAD-04410, Rev. 4) models:

Only the NF-500 Mast with fixed RPF (1.70)

Both GNF2 & GNF3 Fuel with fixed RPF (1.70)

Credit for CREVAS from 24 - 104 hours0.0012 days <br />0.0289 hours <br />1.719577e-4 weeks <br />3.9572e-5 months <br /> post reactor shutdown.

Requires Operator manual action within 8 minutes.

Credit for SC from 0 - 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> post reactor shutdown.

Requires automatic action within 2 minutes.

5 0 - 24 Hours Control Room EAB LPZ GNF2 Dose 2.13 2.98 0.333 GNF3 Dose 2.03 2.84 0.317 Limit 5

6.3 6.3 24 - 104 Hours Control Room EAB LPZ GNF2 Dose 4.95 0.541 0.0605 GNF3 Dose 4.71 0.515 0.0576 Limit 5

6.3 6.3

> 104 Hours Control Room EAB LPZ GNF2 Dose 4.94 0.285 0.0319 GNF3 Dose 4.71 0.271 0.0303 Limit 5

6.3 6.3

Technical Justification:

Fuel Mast and RPF modeling:

Utilization of the NF-500 mast for refueling is planned starting with refueling outage J1R26 (September 2024). The existing FHA analysis does not support the RPF with current core loading strategies and the NF-500 mast. Therefore, changes to the RPF and elimination of the triangular mast were introduced into the FHA analysis.

Credit to SC and CREVAS:

Transition of crediting the SC to CREVAS after 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> was determined to provide relief for outage planning and management. The existing FHA does not credit CREVAS. Modeling of CREVAS at 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> necessitates an operator manual action of 8 minutes.

Operator manual action is controlled by procedure AOP-44. Expected operator response to be under 4 minutes.

Additional cases at 104 hours0.0012 days <br />0.0289 hours <br />1.719577e-4 weeks <br />3.9572e-5 months <br /> post reactor shutdown demonstrated that neither SC or CREVAS are needed to produce acceptable FHA results.

6

Proposed Schedule:

Target Submit Date: 3 August 2023 Requested Approval Date: 3 August 2024 Implementation Date: 2 September 2024 7