05000341/FIN-2010006-03
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Finding | |
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Title | Inadequate Procedures for Controlling Availability of 120kV System Voltage |
Description | The inspectors identified a finding having very low safety significance with an associated NCV of Technical Specifications 5.4.1.a, Procedures for the licensees failure to translate the design requirements for the availability of the 120kV offsite power into station operating procedures, which are used to control voltages on the offsite power system within acceptable ranges. Specifically, the licensee failed to translate the 2.1 percent switchyard voltage drop criteria assumed in calculation DC-0919 into station operating procedures. This finding was entered into the licensees corrective action program to revise the calculations and perform an EFA to demonstrate operability. The finding was more than minor because it was associated with the Mitigating Systems cornerstone attribute of design control and affected the cornerstone objective of ensuring the availability, reliability, and capability of safety-related equipment to respond to initiating events to prevent undesirable consequences. Specifically, the licensee did not ensure the availability of the 120kV power source to 4160V safety buses by implementing procedural controls to ensure that the step voltage decrease on the trip on the Fermi generating unit did not exceed the 2.1 percent value analyzed in calculation DC-0919. This finding is of very low safety significance (Green), because the design deficiency was confirmed not to result in loss of operability or functionality. The inspectors concluded that the cause of the finding was related to the cross-cutting aspect of Human Performance, Resources, because the licensee did not provide complete, accurate, and up-to-date design documentation to assure nuclear safety. (IMC 0310, Section 06.01.b.(3) H.2(c) |
Site: | Fermi |
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Report | IR 05000341/2010006 Section 1R21 |
Date counted | Jun 30, 2010 (2010Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | B Jose C Baron C Brown C Moore G Skinner L Kozak M Jones P Lougheed Z Falevitsb Josec Baron C Brown C Moore G Skinner L Kozak M Jones P Laugheed Z Falevits |
CCA | H.7, Documentation |
INPO aspect | WP.3 |
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Finding - Fermi - IR 05000341/2010006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2010Q2
Self-Identified List (Fermi)
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