05000454/FIN-2009003-02
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Finding | |
|---|---|
| Title | Diesel Oil Storage Tank Vent Regulatory Compliance Backfit May be Required |
| Description | The inspectors noted that the diesel oil storage tank (DOST) vent piping was non-safety related and was located in a non-safety related structure. Subsequent inspector questions focused on the DOSTs ability to vent if the vent lines were crimped during a seismic or tornado generated missile event. During the course of the inspection, the inspectors ascertained that in the associated amendments and Supplemental Safety Evaluation Reports of the early 1980s, the NRC reviewers position was that the vents needed to be seismic and missile protected. Subsequent to that time, communications between the licensee and the NRC resulted in the NRC reviewers accepting the licensees design where the vent lines were routed through the Category II turbine building. However, the reviewers basis was that the licensee had committed to make the vent lines seismically supported, that the licensee had stated that the vent lines would break before crimping, that there were alternate vent paths and that the lines were designed in accordance with ANSI B31.1 piping standards. The NRC inspectors determined that the lines were not modified to be seismically supported and that there were no calculations supporting the break before crimp position. Piping experts consulted by the licensee also indicated that the lines would crimp before breaking. Although alternate vent paths do exist, there was no instrumentation that would alert the plant operators to a need for the alternate vent paths prior to diesel generator operability impact. There were also no procedures, training, or tools needed by the operators to establish the alternate vent paths. A more detailed review of the docket by the inspectors and the licensee determined that there was no actual submittal by the licensee stating they would upgrade the vent paths to seismic grade and the source of the NRC reviewers comment could not be located. The licensee initiated IR 877430 and performed a prompt operability determination. The licensee concluded that the diesel oil storage tanks and the diesel generators remained operable, but degraded in the installed configuration specifically that the NRC reviewers basis for accepting this changes from the design requirements was not valid. The inspectors reviewed the operability determination with no issues identified regarding operability. However, this issue will remain unresolved pending further review of the installed configuration and assessment of 10 CFR 50.109(a)(4) to determine if a modification is necessary to bring the facility into compliance with the rules or orders of the Commission |
| Site: | Byron  |
|---|---|
| Report | IR 05000454/2009003 Section 4OA5 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | J Pearson J Bozga R Skokowski M Learn E Love C Tilton G Morell R Ng C Thompson B Bartlett J Robbins J Cassidy M Mitchell J Neurauter D Jones S Bakhsh T Go V Meghanir Ngc Thompson B Bartlett J Robbins J Cassidy M Phalen A Garmoe R Skokowski J Dalzell |
| INPO aspect | |
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Finding - Byron - IR 05000454/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2009Q2
Self-Identified List (Byron)
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