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{{#Wiki_filter:ASTPresentationSeptember16,2014 NuclearSequoyahNuclearPlant(SQN)
{{#Wiki_filter:Sequoyah Nuclear Plant (SQN)         Nuclear AST Presentation September 16, 2014
TVA Nuclear Power Group 2 Introduction Introduction Purpose of Meeting  
 
*Discussion of AST as it pertains to RAI KAB-044
Introduction Purpose of Meeting
-Current Licensing Bases
* Discussion of AST as it pertains to RAI KAB-044
-Improved Technical Specification Impact
      - Current Licensing Bases
      - Improved Technical Specification Impact


===Introductions===
===Introductions===
*NRC*TVA TVA Nuclear Power Group 3 Current Licensing Bases Current Licensing Bases
* NRC
*TVA-SQN-TS-02-08 submitted to NRC, January 14, 2003
* TVA 2                                      TVA Nuclear Power Group
-Request to modify TS 3.9.4 "Containment Building Penetrations" and Partial scope  
 
Current Licensing Bases
* TVA-SQN-TS-02-08 submitted to NRC, January 14, 2003
    - Request to modify TS 3.9.4 Containment Building Penetrations and Partial scope implementation of the alternate source term
    - Modified applicability requirement for the containment building equipment door (CBED)
    - CBED closure only required during recently irradiated fuel
* NRC approval received on October 28, 2003 3                                      TVA Nuclear Power Group
 
Current Licensing Basis Current wording for T/S 3.9.4 4                              TVA Nuclear Power Group
 
Current Licensing Basis
* TVA and NRC recognized that the Fuel Handling Accident (FHA) within containment is the only Design Basis Accident (DBA) affected by the proposed change
* TVA evaluated a FHA both inside and outside containment
* NRC found that the change to replace the current accident source term used in the design basis FHA within containment with an AST was acceptable 5                                  TVA Nuclear Power Group
 
Current Licensing Basis Excerpt from NRC SE 6                              TVA Nuclear Power Group
 
Current Licensing Basis Excerpt from NRC SE 7                              TVA Nuclear Power Group
 
Current Licensing Basis
* Analysis done for the FHA with AST assumes that the CBED is open and that ABGTS is out of service (no filtration of releases)
* TVA revised some of the assumptions in the FHA Analysis of Record (AOR) in June of 2013
      - Changed the time of the CVI from 30 to 300 seconds
      - Changed the containment air volume for mixing from 5% to 50%
      - Change was done under 10 CFR 50.59
      - Consequences to the FHA decreased by ~7%
8                                                TVA Nuclear Power Group
 
Current Licensing Basis
* Analysis done for the FHA with AST assumes that the CBED is open and that ABGTS is out of service (no filtration of releases)
* TVA revised some of the assumptions in the FHA Analysis of Record (AOR) in June of 2013
      - Changed the time of the CVI from 30 to 300 seconds
      - Changed the containment air volume for mixing from 5% to 50%
      - Change was done under 10 CFR 50.59
      - Consequences to the FHA decreased by ~7%
9                                                TVA Nuclear Power Group
 
Current Licensing Basis 10                      TVA Nuclear Power Group
 
Current Licensing Basis 11                      TVA Nuclear Power Group


implementation of the alternate source
Current Licensing Basis 12                      TVA Nuclear Power Group


term-Modified applicability requirement for the containment building equipment door (CBED)-CBED closure only required during "recently irradiated fuel"
Improved Tech Spec Impact
*NRC approval received on October 28, 2003 TVA Nuclear Power Group 4 Current Licensing Basis Current Licensing BasisCurrent wording for T/S 3.9.4 TVA Nuclear Power Group 5 Current Licensing Basis Current Licensing Basis
* Four T/S were changed in this conversation by changing the APPLICABILITY from During movement of irradiated fuel to During movement of recently irradiated fuel
*TVA and NRC recognized that the Fuel Handling Accident (FHA) within
      - 3.3.6 Containment Ventilation Isolation Instrumentation
      - 3.3.8 Auxiliary Building Gas Treatment System Actuation Instrumentation
      - 3.7.12 Auxiliary Building Gas Treatment System
      - 3.9.4 Containment Penetrations
* In none of these specifications, does SQN CTS have DURING CORE ALTERATIONS 13                                                  TVA Nuclear Power Group


containment is the only Design Basis Accident (DBA) affected by the proposed
Improved Tech Spec Impact
* 3.3.6 Containment Ventilation Isolation Instrumentation 14                                          TVA Nuclear Power Group


change*TVA evaluated a FHA both inside and outside containment
Improved Tech Spec Impact
*NRC found that the change to replace the current accident source term used in
* 3.3.8 Auxiliary Building Gas Treatment System Actuation Instrumentation 15                                          TVA Nuclear Power Group


the design basis FHA within containment
Improved Tech Spec Impact
* 3.7.12 Auxiliary Building Gas Treatment System 16                                        TVA Nuclear Power Group


with an AST was acceptable TVA Nuclear Power Group 6 Current Licensing Basis Current Licensing BasisExcerpt from NRC SE TVA Nuclear Power Group 7 Current Licensing Basis Current Licensing BasisExcerpt from NRC SE TVA Nuclear Power Group 8 Current Licensing Basis Current Licensing Basis
Improved Tech Spec Impact
*Analysis done for the FHA with AST assumes that the CBED is open and that ABGTS is out of service (no filtration of releases)
* 3.9.4 Containment Penetrations 17                                  TVA Nuclear Power Group}}
*TVA revised some of the assumptions in the FHA Analysis of Record (AOR) in June of 2013
-Changed the time of the CVI from 30 to 300 seconds
-Changed the containment air volume for mixing from 5% to 50%-Change was done under 10 CFR 50.59
-Consequences to the FHA decreased by ~7%
TVA Nuclear Power Group 9 Current Licensing Basis Current Licensing Basis
*Analysis done for the FHA with AST assumes that the CBED is open and that ABGTS is out of service (no filtration of releases)
*TVA revised some of the assumptions in the FHA Analysis of Record (AOR) in June of 2013
-Changed the time of the CVI from 30 to 300 seconds
-Changed the containment air volume for mixing from 5% to 50%-Change was done under 10 CFR 50.59
-Consequences to the FHA decreased by ~7%
TVA Nuclear Power Group 10 Current Licensing Basis Current Licensing Basis TVA Nuclear Power Group 11 Current Licensing Basis Current Licensing Basis TVA Nuclear Power Group 12 Current Licensing Basis Current Licensing Basis TVA Nuclear Power Group 13 Improved Tech Spec Impact Improved Tech Spec Impact
*Four T/S were changed in this conversation by changing the APPLICABILITY from "During movement of irradiated fuel" to "During movement of recently irradiated fuel"
-3.3.6 Containment Ventilation Isolation Instrumentation
-3.3.8 Auxiliary Building Gas Treatment System Actuation Instrumentation
-3.7.12 Auxiliary Building Gas Treatment System
-3.9.4 Containment Penetrations
*In none of these specifications, does SQN CTS have DURING CORE ALTERATIONS TVA Nuclear Power Group 14 Improved Tech Spec Impact Improved Tech Spec Impact
*3.3.6 Containment Ventilation Isolation Instrumentation TVA Nuclear Power Group 15 Improved Tech Spec Impact Improved Tech Spec Impact
*3.3.8 Auxiliary Building Gas Treatment System Actuation Instrumentation TVA Nuclear Power Group 16 Improved Tech Spec Impact Improved Tech Spec Impact
*3.7.12 Auxiliary Building Gas Treatment System TVA Nuclear Power Group 17 Improved Tech Spec Impact Improved Tech Spec Impact
*3.9.4 Containment Penetrations}}

Latest revision as of 01:06, 4 November 2019

9/16/2014 Meeting Slide for Sequoyah Nuclear Plant, Units 1 and 2 Regarding AST Presentation
ML14262A330
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 09/16/2014
From:
Tennessee Valley Authority
To:
Office of Nuclear Reactor Regulation
Hon A DORL/LPL2-2 301-415-8480
References
Download: ML14262A330 (17)
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Text

Sequoyah Nuclear Plant (SQN) Nuclear AST Presentation September 16, 2014

Introduction Purpose of Meeting

  • Discussion of AST as it pertains to RAI KAB-044

- Current Licensing Bases

- Improved Technical Specification Impact

Introductions

  • NRC

Current Licensing Bases

  • TVA-SQN-TS-02-08 submitted to NRC, January 14, 2003

- Request to modify TS 3.9.4 Containment Building Penetrations and Partial scope implementation of the alternate source term

- Modified applicability requirement for the containment building equipment door (CBED)

- CBED closure only required during recently irradiated fuel

  • NRC approval received on October 28, 2003 3 TVA Nuclear Power Group

Current Licensing Basis Current wording for T/S 3.9.4 4 TVA Nuclear Power Group

Current Licensing Basis

  • TVA and NRC recognized that the Fuel Handling Accident (FHA) within containment is the only Design Basis Accident (DBA) affected by the proposed change
  • TVA evaluated a FHA both inside and outside containment
  • NRC found that the change to replace the current accident source term used in the design basis FHA within containment with an AST was acceptable 5 TVA Nuclear Power Group

Current Licensing Basis Excerpt from NRC SE 6 TVA Nuclear Power Group

Current Licensing Basis Excerpt from NRC SE 7 TVA Nuclear Power Group

Current Licensing Basis

  • Analysis done for the FHA with AST assumes that the CBED is open and that ABGTS is out of service (no filtration of releases)
  • TVA revised some of the assumptions in the FHA Analysis of Record (AOR) in June of 2013

- Changed the time of the CVI from 30 to 300 seconds

- Changed the containment air volume for mixing from 5% to 50%

- Change was done under 10 CFR 50.59

- Consequences to the FHA decreased by ~7%

8 TVA Nuclear Power Group

Current Licensing Basis

  • Analysis done for the FHA with AST assumes that the CBED is open and that ABGTS is out of service (no filtration of releases)
  • TVA revised some of the assumptions in the FHA Analysis of Record (AOR) in June of 2013

- Changed the time of the CVI from 30 to 300 seconds

- Changed the containment air volume for mixing from 5% to 50%

- Change was done under 10 CFR 50.59

- Consequences to the FHA decreased by ~7%

9 TVA Nuclear Power Group

Current Licensing Basis 10 TVA Nuclear Power Group

Current Licensing Basis 11 TVA Nuclear Power Group

Current Licensing Basis 12 TVA Nuclear Power Group

Improved Tech Spec Impact

  • Four T/S were changed in this conversation by changing the APPLICABILITY from During movement of irradiated fuel to During movement of recently irradiated fuel

- 3.3.6 Containment Ventilation Isolation Instrumentation

- 3.3.8 Auxiliary Building Gas Treatment System Actuation Instrumentation

- 3.7.12 Auxiliary Building Gas Treatment System

- 3.9.4 Containment Penetrations

  • In none of these specifications, does SQN CTS have DURING CORE ALTERATIONS 13 TVA Nuclear Power Group

Improved Tech Spec Impact

  • 3.3.6 Containment Ventilation Isolation Instrumentation 14 TVA Nuclear Power Group

Improved Tech Spec Impact

Improved Tech Spec Impact

Improved Tech Spec Impact

  • 3.9.4 Containment Penetrations 17 TVA Nuclear Power Group
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