ML102910685

Email - from: Fagan, Paul (Paul.Fagan@Pgnmail.Com) to: Lakelf@Bellsouth.Net'; Lake, Louis Cc: Miller, Garry Dated Monday December 14, 2009 11:14 Am Subject: Emailing: 2009 Dec 11 - Root Cause Update for Nrc.Pptx Attachments: 2009 Dec 11 - R

ML102910685
Person / Time
Site:	Crystal River
Issue date:	12/14/2009
From:	Fagan C Progress Energy Co
To:	Lake L NRC/RGN-II/DRS/EB3
References
FOIA/PA-2010-0116
Download: ML102910685 (3)

Text

Sengb~pta, Ab~hijit From: Fagan, Paul [Paul.Fagan @pgnmail.com]

Sent: Monday, December 14, 2009 11:14 AM To: 'lakelf @bellsouth.net'; Lake, Louis Cc: Miller, Garry

Subject:

Emailing: 2009 Dec 11 - Root Cause Update for NRC.pptx "'

Attachments: 2009 Dec 11 - Root Cause Update for NRC.pptx - .

The message is ready to be sent with the following file or link attachments:

2009 Dec 11 - Root Cause Update for NRC.pptx Note: To protect against computer viruses, e-mail programs may prevent sending or receiving certain types of file attachments. Check your e-mail security settings to determine how attachments are handled.

1 rol Uý (Yý

Root Cause Analysis - P11 Metrics as of Dec 11th 2009 Open FailureModes (yet to be supported or refuted) 80 ) External Events 70 (4)Operational Events 60 n (7) Inadequate Containment qutting 50  ;)Inadequate Concrete - Tendon teractions 40 ,) Chemically or Environmentally duced Aging 30 *(4) Shrinkage, Creep and Sbttlement 20 ) Inadequate Use of Concrete aterials 10 0

J I~I H U-

) Inadequate Concrete onstruction

> > 0 > > > > 0 0 0 0 0000 0 0

• (1) Inadequate Concrete Design 000 o0 o0 0 0 0 0 0 0 0 0 0 0 0 4, 4 )6)4 4)4)4)4) 0)4) 1Z z z z z z(0 z z z(NJ z z z z 0000 I I I I 00 due to High Local Stress

(-I c0 d)

N, (NJ CC (6 C6 6 0C~(0

~ '- ,- '-NI 2Progress Energy

Root Cause Analysis - PII Metrics as of Dec 11th 2009 FailureModes Identified (to date) as PotentialContributors 16 ) External Events 14 ) Operational Events N(7 12 ) Inadequate Containment C1itting 10 0(6

) Inadequate Concrete -

TE

ýndon interactions 8 ) Chemically or E rvironmentally Induced Aging 6 * (4) Shrinkage, Creep and S ,ttlement 4 m(2) Inadequate Use of Concrete M aterials 2 w (2) Inadequate Concrete C nstruction 0 > > > > > > > > > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

-i) Inadequate Concrete Design 0 0 0 0 0 0 0 0 00 V 0 0 0*0* 0 0* 0 0*0 0 0 0 0 0 0 0 0 0 Z Z Z Z Z Z Z Z Z a a 0 0~ al a a a' a 0 0 0 0 0 0 a0 0 a & Analysis (Excessive Local Stress)

Note that wtlie there is some evidence suggesting that conditions physically exist to sup! Iort Progress Energy these failure modes, they may still transition to a "Refuted" status as the root cause anal) isis 2 proceeds, a d their specific contribution to the root cause is further quantified/analyzed