ML082130193

Draft RAI for Relief Request #1

ML082130193
Person / Time
Site:	Saint Lucie
Issue date:	07/31/2008
From:	Mozafari B NRC/NRR/ADRO/DORL/LPLII-2
To:	Frehafer K Florida Power & Light Co
References
TAC MD8041
Download: ML082130193 (2)

Text

Accession Number: ML082130193

From: Brenda Mozafari Sent: Thursday, July 31, 2008 10:16 AM To: 'Ken_Frehafer@fpl.com'

Subject:

St. Lucie 1 RAI Draft Questions for RI-ISI Relief Request 1 (TAC MD8041)

Ken, REQUEST FOR ADDITIONAL INFORMATION ST. LUCIE UNIT 1, INSERVICE INSPECTION PLAN FOURTH TEN-YEAR INTERVAL UNIT 1 RELIEF REQUEST 1

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated December 7, 2007, Florida Power and Light (FPL) submitted Relief Request 1 for the fourth 10-year inservice inspection (ISI) interval for St. Lucie Unit 1. To complete its review of Relief Request 1, the NRC's staff requests the following additional information.

1) Development of a risk-informed ISI (RI-ISI) program requires estimating conditional core damage and conditional large early release probabilities (CCDPs and CLERPs respectively) from the baseline PRA. Please briefly describe how the CCDPs and CLERPs that are used in the RI-ISI calculations are generated.

2) Has FPL modified or manipulated the cut-sets (or other equivalent logic model results) obtained from the baseline PRA model prior to calculating the CCDPs and CLERPs that are used to develop the RI-ISI program?

3) If the cut-sets are modified or manipulated, please describe the technical bases for the changes and explain why the changes were judged necessary.

4) If the cut-sets are modified or manipulated, please describe the reviews done on the technical bases for the changes, and the manipulations used to make the changes, to demonstrate that the changes are consistent with the ASME PRA standard and prior peer review results with respect to the PRA quality requirements needed to support RI-ISI.

Previously the following question was sent via email on May 22, 2008, and the staff is expecting a response shortly.

"The PWSCC damage mechanism should be addressed separately from RI-ISI with an augmented program (MRP-139) that includes its own selection criteria and response to degradation identification. The MRP-139 inspection program may not be subsumed into RI-ISI and the inspections may not be credited to satisfy inspections required under the

RI-ISI program. The RI-ISI program should satisfy the WCAP's selection criteria and response to flaw identification independently of the MRP-139 program. " This question is docketed in ADAMS as an email (ML082050619).

The sole purpose of this e-mail is to prepare you and others for the proposed telephone conference. With or without the conference, we plan to formally issue an RAI to you around August 8, 2008. Thus, this e-mail does not formally request additional information or convey an NRC staff position.

Brenda Mozafari Senior Project Manager Nuclear Regulatory Commission Saint Lucie 1 and 2; Turkey Point 3 and 4 301-415-2020

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Subject:

St. Lucie 1 RAI Draft Questions for RI-ISI Relief Request 1 (TAC MD8041)

Sent Date: 7/31/2008 10:03:05 AM Received Date: 7/31/2008 10:16:00 AM From: Brenda Mozafari

Created By: Brenda.Mozafari@nrc.gov

Recipients:

Ken_Frehafer@fpl.com ('Ken_Frehafer@fpl.com')

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