05000331/FIN-2010002-02
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Finding | |
|---|---|
| Title | Lift Height Assumptions in Drop Load Analyses Not Reflected in Rigging Procedures |
| Description | A finding of very low safety significance was identified by the inspectors for deficiencies in the design documents for failure to translate the lift height assumptions used in drop load evaluations into field instructions in appropriate rigging procedures. Specifically, calculations for accidental drop during handling of the fuel pool area demineralizer shield plug and of the reactor feed pump motor were based on specific lift heights during rigging; however, no field instructions were provided for limiting the rigging to the specified heights. The licensee documented the condition in CAPs 072551 and 072811 and initiated actions for calculation/procedure revisions. The inspectors determined that lack of field instructions or procedures restricting the lift heights was inconsistent with the assumptions used in the drop load analyses and was a performance deficiency. The finding was determined to be more than minor because the finding was associated with the Mitigating Systems Cornerstone attribute of Equipment Performance and affected the cornerstone objective to ensure availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). The inspectors evaluated the finding using the SDP in accordance with IMC 0609, Significance Determination Process, Attachment 0609.04, Phase I - Initial Screening and Characterization of Findings, Table 4a for the Mitigating Systems. Using the screening questions in Table 4a, the inspectors determined that the finding was of very low safety significance because the deficiency did not result in loss of operability or function. This finding has a cross-cutting aspect in the area of Problem Identification and Resolution because the licensee did not perform a thorough evaluation of CAP 053197 in October 2007 which identified that the lift height assumptions used in the calculation for the stud tensioner load drop were not translated into field instructions or procedures P.1(c). |
| Site: | Duane Arnold  |
|---|---|
| Report | IR 05000331/2010002 Section 1R20 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | K Riemer R Orlikowski M Mitchell R Baker V Meghani R Russell R Murray P Smagacz |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
| Finding closed by | |
| IR 05000331/2010002 (14 May 2010) | |
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Finding - Duane Arnold - IR 05000331/2010002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Duane Arnold) @ 2010Q1
Self-Identified List (Duane Arnold)
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