ML101180262

Root Cause Analysis - PII Metrics as of Dec 28th 2009

ML101180262
Person / Time
Site:	Crystal River
Issue date:	12/28/2009
From:	Progress Energy Carolinas
To:	Office of Information Services
References
FOIA/PA-2010-0116
Download: ML101180262 (2)

Text

Root Cause Analysis - P11 MetriCS as of Dec 2811,2009 Open FailureModes 80 *(9) External Events 70 (8) Operational Events 60 * (7) Inadequate Containment Cutting 50 * (6) Inadequate Concrete - Tendon interactions 40 a (5) Chemically or Environmentally Induced Aging 30 0 (4) Shrinkage, Creep and II Settlement 20 0 (3) Inadequate Use of Concrete Materials I

10 (2) Inadequate Concrete 0

C~4(~.I z +.z 0000 a 0 (T--1 z z IL z; 1 IzLa ~ 11 Construction

• (1) Inadequate Concrete Design due to High Local Stress 1

SProgress Energy

Root Cause Analysis - PH MetriCS as of Dec 28th 2009 FailureModes Identified (to date) as PotentialContributors 16-14 1 (9) External Events (8) Operational Events 12

• (7) Inadequate Containment 10 - Cutting

• (6) Inadequate Concrete -

8 - -Tendon interactions

• (5) Chemically or 6 Environmentally Induced Aging

• (4) Shrinkage, Creep and 4 Settlement m(3) Inadequate Use of Concrete 2 Materials (2) Inadequate Concrete 0 , , -_----

,T-V_--,-,-,- - ,,---- Construction Note that while there is some evidence suggesting that conditions physically exist to support 2

these failure modes, they may still transition to a "Refuted" status as the root cause analysis proceeds, and their specific contribution to the root cause is further quantified/analyzed Progress Energy