ML102910696

Email - from: Orf, Tracy to: Lake, Louis Dated Monday, December 14, 2009 7:32 Am Subject: FW: CR3 Root Cause Information Attachments: 2009 Dec 11 - Root Cause Update for Nrc.Pptx

ML102910696
Person / Time
Site:	Crystal River
Issue date:	12/14/2009
From:	Orf T Plant Licensing Branch II
To:	Lake L NRC/RGN-II/DRS/EB3
References
FOIA/PA-2010-0116
Download: ML102910696 (2)

Text

Sengupta, Abhijit From: Orf, Tracy Sent: Monday, December 14, 2009 7:32 AM To: Lake, Louis

Subject:

FW: CR3 Root Cause Information Attachments: 2009 Dec 11 - Root Cause Update for NRC.pptx )

From: McCabe, Brian [1]

Sent: Monday, December 14, 2009 7:29 AM To: Sykes, Marvin; Franke, Mark; Wert, Leonard; Kennedy, Kriss; Saba, Farideh; Orf, Tracy

Subject:

CR3 Root Cause Information As we discussed last Thursday, the root cause investigative work (not the report) is scheduled to be completed by 12/28.

Brian

Root Cause Analysis - PII Metrics as of Dec 11th 2009 qP Open FailureModes (yet to be supported or refuted) 80 ) External Events I,

70 ($) Operational Events 60 Iutting Inadequate Containment 50 I) Inadequate Concrete - Tendon teractions 40  ;) Chemically or Environmentally iduced Aging 30 [) Shrinkage, Creep and ettlement 20 m(4) Inadequate Use of Concrete Materials 1

I1 0

m .

L w I0 a (4) Inadequate Concrete cqonstruction 0 (1) Inadequate Concrete Design 0 0 Q Z 0 0 000 0 0 Z0> z Z0> Z0> Z0 0'11 r!-& ' &

C z z z z z z z z z C) C) C C.) 0000004b V-4)V-4)-4) T)4)4) N due to High Local Stress 4 (b (& A z zCzz 1

Progress Energy