05000482/FIN-2008004-08
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Finding | |
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Title | Diesel generator low frequency and voltage variation not considered in calculations |
Description | The inspectors identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for failure to account for the effect of emergency diesel generator frequency variation at the lower limit of the allowable range. Specifically, emergency diesel generator voltage and frequency deviations for load sequencing was based on nominal 60 hertz operation of pumps and fans and did not account for the two percent variation allowed by Technical Specification 3.8.1. Wolf Creek could not demonstrate compliance with Updated Safety Analysis Report, Section 8.1.4.3.b. The licensee has entered this issue into their corrective action program as Condition Report 2008-004312. The inspectors determined that failure to properly account for the effect of frequency variation on the emergency diesel generator was a performance deficiency. The finding was more than minor because it was associated with the mitigating systems cornerstone attribute of design control and affected the associated cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, failure to account for the frequency variations at the lower limit had more than a minimal effect on the outcome of the analysis, in that, the bus frequency will decrease below the Updated Safety Analysis Report limit of 57 hertz for loss of coolant accident and loss of offsite power scenarios. This finding screened as having very low safety significance because it was a design or qualification deficiency confirmed not to result in loss of operability (Section 4OA5). |
Site: | Wolf Creek ![]() |
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Report | IR 05000482/2008004 Section 4OA5 |
Date counted | Sep 30, 2008 (2008Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | |
Inspectors (proximate) | R Deese D Dumbacher S Cochrum C Long P Alter J Groom W Schaup R Hickok |
INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2008004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2008Q3
Self-Identified List (Wolf Creek)
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