ML102910685
| ML102910685 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 12/14/2009 |
| From: | Fagan C A Progress Energy Co |
| To: | Lake L F NRC/RGN-II/DRS/EB3 |
| References | |
| FOIA/PA-2010-0116 | |
| Download: ML102910685 (3) | |
Text
Sengb~pta, Ab~hijit From: Sent: To: Cc:
Subject:
Attachments:
Fagan, Paul [Paul.Fagan
@ pgnmail.com]
Monday, December 14, 2009 11:14 AM'lakelf @ bellsouth.net';
Lake, Louis Miller, Garry Emailing:
2009 Dec 11 -Root Cause Update for NRC.pptx "'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 U ý (Yý Root Cause Analysis -P11 Metrics as of Dec 11th 2009 Open Failure Modes (yet to be supported or refuted)80 70 60 50 40 30 20 10 I~I) External Events (4) Operational Events n (7) Inadequate Containment qutting;) Inadequate Concrete -Tendon teractions
,) Chemically or Environmentally duced Aging J 0 0 o o) Inadequate Use of Concrete aterials) Inadequate Concrete onstruction
- (4) Shrinkage, Sbttlement Creep and 0 H U-000 1Z 0 z c0 0 z> >0 0 z z 0 z (0 0 z 0 z d)N, 0 z (NJ (NJ> >0 0 z z CC (6> >0 0 z z C6 6 0 4, (-I 0 0 0 4 )6)4 0000 4)4)4)4)0000 I I I I 0C~(0~ '- ,-0 0 0)4)00'-NI*(1) Inadequate Concrete Design due to High Local Stress 2Progress Energy Root Cause Analysis -PII Metrics as of Dec 11th 2009 Failure Modes Identified (to date) as Potential Contributors 16 14 12 10 8 N(7 C1 0(6 TE) External Events) Operational Events) Inadequate Containment itting) Inadequate Concrete -ýndon interactions) Chemically or 6 4 2 0 E rvironmentally Induced Aging* (4) Shrinkage, Creep and S ,ttlement m (2) Inadequate Use of Concrete M aterials w (2) Inadequate Concrete C nstruction-i) Inadequate Concrete Design& Analysis (Excessive Local Stress)Iort Progress Energy isis> > > > > > > > > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 V 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 Note that wtlie there is some evidence suggesting that conditions physically exist to sup!these failure modes, they may still transition to a "Refuted" status as the root cause anal)proceeds, a d their specific contribution to the root cause is further quantified/analyzed 2