05000373/FIN-2016001-01
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Finding | |
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| Title | Adequacy of Changes to Pool Swell Analysis |
| Description | (Opened) Unresolved Item 05000373; 05000374/201600101: Adequacy of Changes to Pool Swell Analysis Introduction: The inspectors identified an unresolved item (URI) related to the licensees changes to the assumptions in their design basis method of analysis associated with the pool swell calculation of record. The inspectors could not resolve the issue of concern during the inspection period due to the need for additional information. Description: While reviewing the recent revision to operability evaluation 12003, the inspectors identified an issue of concern regarding the licensees changes to the assumptions of the design basis calculation of record for the loss of coolant accident suppression pool swell analysis. This operability evaluation assessed the effects of a previous error identified by the licensee in the design calculation and incorporated additional changes in the design assumptions which resulted in the recapture of significant amount of margin in the analysis. Specifically, the licensee changed the initial blowdown characteristics from all air to an air/steam mixture, which improved the margin of the analysis. The inspectors are evaluating the changes against the guidance of IMC 0326, Operability Determinations & Functionality Assessments for Conditions Adverse to Quality or Safety. Additionally, the inspectors are reviewing whether or not regulatory relief was/is required to be sought by the licensee from the NRC for the ASME Code requirement per the guidance in IMC 0326. The inspectors are opening this URI because more information/guidance is needed from the NRC Headquarters Office of Nuclear Reactor Regulation to determine if this issue of concern represents a violation of regulatory requirements. (URI 05000373; 05000374/201600101: Adequacy of Changes to Pool Swell Analysis). |
| Site: | LaSalle  |
|---|---|
| Report | IR 05000373/2016001 Section 1R15 |
| Date counted | Mar 31, 2016 (2016Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | B Dickson C Hunt G Roach J Robbins R Ruiz R Zuffa T Bilik T Go |
| INPO aspect | |
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Finding - LaSalle - IR 05000373/2016001 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (LaSalle) @ 2016Q1
Self-Identified List (LaSalle)
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