ML083220972: Difference between revisions

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{{#Wiki_filter:Accession No. ML083220972  
{{#Wiki_filter:Accession No. ML083220972 From:                     Peter Tam Sent:                     Monday, November 17, 2008 3:41 PM To:                       Jack Gadzala (jack.gadzala@dom.com); Thomas Breene (thomas.l.breene@dom.com); Craig Sly (craig.d.sly@dom.com)
 
Cc:                       George Thomas (NRR); Robert Palla
From: Peter Tam Sent: Monday, November 17, 2008 3:41 PM To: Jack Gadzala (jack.gadzala@dom.com); Thomas Breene (thomas.l.breene@dom.com); Craig Sly (craig.d.sly@dom.com) Cc: George Thomas (NRR); Robert Palla  


==Subject:==
==Subject:==
Kewaunee - Draft RAI on the PRA of proposed amendment re. extended ILRT interval (TAC MD9612)
Kewaunee - Draft RAI on the PRA of proposed amendment re. extended ILRT interval (TAC MD9612)
Jack: The PRA Licensing Branch (APLA) has reviewed Dominion Energy's risk analysis submitted in support of its request to extend the test interval for the Integrated Leakage Rate Test (ILRT) for Kewaunee Power Station. APLA has identified areas where additional information is needed to complete its review.
Jack:
: 1.         The baseline internal event core damage frequency (CDF) and large early release frequency (LERF) values used in the integrated leak rate test (ILRT) analysis (8.1E-5 per year and 9.9E-6 per year, respectively, based on PRA Version K107Aa dated July 2008) are about half the values reported in the recent Kewaunee severe accident mitigation alternative (SAMA) analysis (4.21E-5 per year and 4.86E-6 per year, respectively, based on PRA Version K101AASAMA dated May 2007). Provide a description of the major changes to PRA models and assumptions that account for these reductions.
The PRA Licensing Branch (APLA) has reviewed Dominion Energys risk analysis submitted in support of its request to extend the test interval for the Integrated Leakage Rate Test (ILRT) for Kewaunee Power Station. APLA has identified areas where additional information is needed to complete its review.
: 2.         Identify the version of the PRA subjected to the independent assessment performed in January 2008. Describe any assessment findings/issues in areas related to the aforementioned CDF and LERF reductions. Describe the resolution of these issues and the impact of any unresolved issues on the risk results for the requested change.
: 1.     The baseline internal event core damage frequency (CDF) and large early release frequency (LERF) values used in the integrated leak rate test (ILRT) analysis (8.1E-5 per year and 9.9E-6 per year, respectively, based on PRA Version K107Aa dated July 2008) are about half the values reported in the recent Kewaunee severe accident mitigation alternative (SAMA) analysis (4.21E-5 per year and 4.86E-6 per year, respectively, based on PRA Version K101AASAMA dated May 2007). Provide a description of the major changes to PRA models and assumptions that account for these reductions.
: 3.         The fire LERF used in the ILRT analysis (3.18E-8 per year based on a December 2003 RAI response) is lower than the value reported in the SAMA analysis (4.90E-8 per year). Describe the evolution of the fire LERF value from the IPEEE to present. Justify the fire LERF value used in the ILRT analysis in view of the results from the most recent internal event and fire assessments.
: 2.     Identify the version of the PRA subjected to the independent assessment performed in January 2008. Describe any assessment findings/issues in areas related to the aforementioned CDF and LERF reductions. Describe the resolution of these issues and the impact of any unresolved issues on the risk results for the requested change.
: 3.     The fire LERF used in the ILRT analysis (3.18E-8 per year based on a December 2003 RAI response) is lower than the value reported in the SAMA analysis (4.90E-8 per year). Describe the evolution of the fire LERF value from the IPEEE to present. Justify the fire LERF value used in the ILRT analysis in view of the results from the most recent internal event and fire assessments.
Please contact me to set up a conference call where we will discuss disposition of these drat questions.
Please contact me to set up a conference call where we will discuss disposition of these drat questions.
The sole purpose of this e-mail is to prepare you and others for the proposed conference call. It does not formally request for additional information, and it does not convey a formal NRC staff position. Peter S. Tam, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation E-mail Properties Mail Envelope Properties (C56E360E9D804F4B95BC673F886381E717F7B2E8F1)  
The sole purpose of this e-mail is to prepare you and others for the proposed conference call. It does not formally request for additional information, and it does not convey a formal NRC staff position.
Peter S. Tam, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation E-mail Properties
 
Mail Envelope Properties (C56E360E9D804F4B95BC673F886381E717F7B2E8F1)


==Subject:==
==Subject:==
Kewaunee - Draft RAI on the PRA of proposed amendment re. extended ILRT interval (TAC MD9612)  
Kewaunee - Draft RAI on the PRA of proposed amendment re. extended ILRT interval (TAC MD9612)
 
Sent Date:       11/17/2008 3:41:16 PM Received Date:        11/17/2008 3:41:00 PM From:             Peter Tam Created By:        Peter.Tam@nrc.gov Recipients:
Sent Date:       11/17/2008 3:41:16 PM Received Date:        11/17/2008 3:41:00 PM From:               Peter Tam  
jack.gadzala@dom.com (Jack Gadzala (jack.gadzala@dom.com))
 
Tracking Status: None thomas.l.breene@dom.com (Thomas Breene (thomas.l.breene@dom.com))
Created By:        Peter.Tam@nrc.gov  
Tracking Status: None craig.d.sly@dom.com (Craig Sly (craig.d.sly@dom.com))
 
Recipients:
jack.gadzala@dom.com (Jack Gadzala (jack.gadzala@dom.com))                 Tracking Status: None thomas.l.breene@dom.com (Thomas Breene (thomas.l.breene@dom.com))                 Tracking Status: None craig.d.sly@dom.com (Craig Sly (craig.d.sly@dom.com))
Tracking Status: None George.Thomas2@nrc.gov (George Thomas (NRR))
Tracking Status: None George.Thomas2@nrc.gov (George Thomas (NRR))
Tracking Status: None  
Tracking Status: None Robert.Palla@nrc.gov (Robert Palla)
 
Tracking Status: None Post Office:
Robert.Palla@nrc.gov (Robert Palla)                 Tracking Status: None  
HQCLSTR02.nrc.gov Files           Size     Date & Time MESSAGE           9818     11/17/2008 Options Expiration Date:
 
Priority:                 olImportanceNormal ReplyRequested:         False Return Notification:        False Sensitivity:       olNormal Recipients received:}}
Post Office:
HQCLSTR02.nrc.gov  
 
Files               Size       Date & Time  
 
MESSAGE       9818       11/17/2008  
 
Options Expiration Date:
Priority:                       olImportanceNormal ReplyRequested:       False Return Notification:        False  
 
Sensitivity:         olNormal Recipients received:}}

Latest revision as of 12:07, 14 November 2019

Draft RAI Re. PRA Associated with Proposed Amendment to Extend ILRT Interval
ML083220972
Person / Time
Site: Kewaunee Dominion icon.png
Issue date: 11/17/2008
From: Tam P
Plant Licensing Branch III
To: Breene T, Gadzala J
Dominion Energy Kewaunee
Tam P
References
TAC MD9612
Download: ML083220972 (2)
v • d • e


Text

Accession No. ML083220972 From: Peter Tam Sent: Monday, November 17, 2008 3:41 PM To: Jack Gadzala (jack.gadzala@dom.com); Thomas Breene (thomas.l.breene@dom.com); Craig Sly (craig.d.sly@dom.com)

Cc: George Thomas (NRR); Robert Palla

Subject:

Kewaunee - Draft RAI on the PRA of proposed amendment re. extended ILRT interval (TAC MD9612)

Jack:

The PRA Licensing Branch (APLA) has reviewed Dominion Energys risk analysis submitted in support of its request to extend the test interval for the Integrated Leakage Rate Test (ILRT) for Kewaunee Power Station. APLA has identified areas where additional information is needed to complete its review.

1. The baseline internal event core damage frequency (CDF) and large early release frequency (LERF) values used in the integrated leak rate test (ILRT) analysis (8.1E-5 per year and 9.9E-6 per year, respectively, based on PRA Version K107Aa dated July 2008) are about half the values reported in the recent Kewaunee severe accident mitigation alternative (SAMA) analysis (4.21E-5 per year and 4.86E-6 per year, respectively, based on PRA Version K101AASAMA dated May 2007). Provide a description of the major changes to PRA models and assumptions that account for these reductions.
2. Identify the version of the PRA subjected to the independent assessment performed in January 2008. Describe any assessment findings/issues in areas related to the aforementioned CDF and LERF reductions. Describe the resolution of these issues and the impact of any unresolved issues on the risk results for the requested change.
3. The fire LERF used in the ILRT analysis (3.18E-8 per year based on a December 2003 RAI response) is lower than the value reported in the SAMA analysis (4.90E-8 per year). Describe the evolution of the fire LERF value from the IPEEE to present. Justify the fire LERF value used in the ILRT analysis in view of the results from the most recent internal event and fire assessments.

Please contact me to set up a conference call where we will discuss disposition of these drat questions.

The sole purpose of this e-mail is to prepare you and others for the proposed conference call. It does not formally request for additional information, and it does not convey a formal NRC staff position.

Peter S. Tam, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation E-mail Properties

Mail Envelope Properties (C56E360E9D804F4B95BC673F886381E717F7B2E8F1)

Subject:

Kewaunee - Draft RAI on the PRA of proposed amendment re. extended ILRT interval (TAC MD9612)

Sent Date: 11/17/2008 3:41:16 PM Received Date: 11/17/2008 3:41:00 PM From: Peter Tam Created By: Peter.Tam@nrc.gov Recipients:

jack.gadzala@dom.com (Jack Gadzala (jack.gadzala@dom.com))

Tracking Status: None thomas.l.breene@dom.com (Thomas Breene (thomas.l.breene@dom.com))

Tracking Status: None craig.d.sly@dom.com (Craig Sly (craig.d.sly@dom.com))

Tracking Status: None George.Thomas2@nrc.gov (George Thomas (NRR))

Tracking Status: None Robert.Palla@nrc.gov (Robert Palla)

Tracking Status: None Post Office:

HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 9818 11/17/2008 Options Expiration Date:

Priority: olImportanceNormal ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received:

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