05000341/FIN-2015001-03
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Finding | |
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| Title | Unplanned Scrams Per 7,000 Critical Hours Performance Indicator Question |
| Description | The inspectors identified an Unresolved Item (URI) related to a manual reactor scram on February 10, 2014, that was not reported against the Unplanned Scrams per 7,000 Critical Hours Performance Indicator. On February 10, 2014, the licensee was lowering reactor power using a combination of reactor recirculation flow and control rods to enter a refueling outage. Normally, the licensee's general operating procedures governing plant shutdown would direct operators to lower power to about 20 percent before inserting a manual reactor scram. However, at about 66 percent power, the control rod select logic function of the Control Rod Position Indication System malfunctioned, resulting in an inability to manually move control rods. Both insertion and withdrawal of individual control rods were unavailable; however, the safety-related function to manually or automatically insert all rods to scram the reactor remained available. The licensee made a decision to revise its operating procedure, creating a completely new section directing operators to initiate a manual scram if the control rod select function was not working and the reactor was less than 75 percent power. Based on the fact that a scram was the desired outcome to enter the refueling outage and the malfunction with the control rod select logic was added to the general operating procedure, the licensee regarded this as a planned scram and did not report it against the performance indicator. Based on review of the NEI 9902 performance indicator reporting guidance, the inspectors questioned the licensees decision not to report this scram against the performance indicator. Although scrams that are part of a normal planned operation or evolution (e.g., a scram initiated from 35 percent power or less during a planned plant shutdown) are not counted against the performance indicator per the NEI 9902 guidance, the licensee does not normally scram from 66 percent power in the course of a normal plant shutdown and did not originally plan to do so. The licensee made a change to its operating procedure as a work-around for an equipment failure to allow operators to scram from a much higher power than the procedure normally directed. This issue is considered a URI (URI 05000341/201500103, Unplanned Scrams per 7,000 Critical Hours Performance Indicator Question) pending final resolution of open questions regarding interpretation of the performance indicator guidance. |
| Site: | Fermi  |
|---|---|
| Report | IR 05000341/2015001 Section 4OA1 |
| Date counted | Mar 31, 2015 (2015Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71151 |
| Inspectors (proximate) | B Dickson B Kemker J Nance P Smagaczb Kemkerj Jandovitz M Kunowski P Smagacz |
| INPO aspect | |
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Finding - Fermi - IR 05000341/2015001 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2015Q1
Self-Identified List (Fermi)
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