05000275/FIN-2009004-03
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Finding | |
|---|---|
| Title | Failure to Follow Emergency Operating Procedures Following a Reactor Trip |
| Description | The inspectors identified a noncited violation of Technical Specification 5.4.1.b, Emergency Operating Procedures, after plant operators failed to enter Emergency Operating Procedures E-0, Reactor Trip or Safety Injection, and E-0.1, Reactor Trip Response, following a Unit 2 reactor trip on June 30, 2009. Plant operators initiated a rapid load reduction from full power following loss of cooling to a main transformer bank. Plant operators manually tripped the reactor at about two percent power and proceeded to the procedure for placing the unit in cold shutdown. Plant operators did not perform the required steps in Emergency Operating Procedures E-0 and E-0.1 following the reactor trip. The inspectors concluded that the most significant contributor to the violation was less than adequate direction in the procedure used for rapid load reduction. The licensee entered this violation into the corrective action program as Notification 50262363. The finding is greater than minor because the failure of operations personnel to implement emergency operator procedures was associated with the mitigating - 4 - Enclosure systems cornerstone human performance attribute to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors concluded the significance of this finding is of very low safety significance because the finding was not a design or qualification deficiency, did not result in loss of equipment operability or functionality, or screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. This finding had a crosscutting aspect in the area of human performance associated with the resource component because Pacific Gas and Electric did not have a complete rapid load reduction procedure H.2(c) |
| Site: | Diablo Canyon  |
|---|---|
| Report | IR 05000275/2009004 Section 1R20 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | G Guerra M Brown M Peck S Garchow V Gaddy G Apger B Larson J Braisted |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Diablo Canyon - IR 05000275/2009004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2009Q3
Self-Identified List (Diablo Canyon)
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