ML083240835

From kanterella
Revision as of 05:46, 12 July 2019 by StriderTol (talk | contribs) (Created page by program invented by StriderTol)
Jump to navigation Jump to search

Revised Draft RAI on the PRA Associated with Proposed Amendment Extension of ILRT Interval
ML083240835
Person / Time
Site: Kewaunee Dominion icon.png
Issue date: 11/18/2008
From: Tam P
Plant Licensing Branch III
To: Breene T, Gadzala J, Sly C
Dominion Energy Kewaunee
Tam P
References
TAC MD9612
Download: ML083240835 (2)


Text

Accession No. ML083240835

From: Peter Tam Sent: Tuesday, November 18, 2008 6:56 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 - Revised draft RAI on the PRA for proposed amendment re. extended ILRT interval (TAC MD9612)

Jack: During the conference today, the PRA Licensing Branch agreed to amend the 3 draft RAI questions. Following are the results.

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 (4.21E-5 per year and 4.86E-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 (8.1E-5 per year and 9.9E-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). Justify the fire LERF value used in the ILRT analysis in view of the results from the most recent internal event and fire assessments.

I believe you said in the conference call that you would respond to these questions in about 30 days.

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 (C56E360E9D804F4B95BC673F886381E717F7B2E906)

Subject:

Kewaunee - Revised draft RAI on the PRA for proposed amendment re. extended ILRT interval (TAC MD9612)

Sent Date: 11/18/2008 6:56:15 PM Received Date: 11/18/2008 6:56:00 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 13906 11/18/2008

Options Expiration Date:

Priority: olImportanceNormal ReplyRequested: False Return Notification: False

Sensitivity: olNormal Recipients received: