ML15264A753: Difference between revisions

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{{Adams
#REDIRECT [[Press Release-IV-15-028 - NRC to Begin Special Inspection at Callaway Nuclear Station, Press Release-IV-15-028 - NRC to Begin Special Inspection at Callaway Nuclear Station]]
| number = ML15264A753
| issue date = 09/21/2015
| title = Press Release-IV-15-028 - NRC to Begin Special Inspection at Callaway Nuclear Station
| author name =
| author affiliation = NRC/OPA/RGN-IV/FO
| addressee name =
| addressee affiliation =
| docket = 05000483
| license number =
| contact person =
| document report number = Press Release-IV-15-028
| document type = Press Release
| page count = 1
}}
 
=Text=
{{#Wiki_filter:No: IV-15-028 September 21, 2015 CONTACT:  Victor Dricks    (817) 200-1128  Lara Uselding  (817) 200-1519  NRC to Begin Special Inspection at Callaway Nuclear Station The Nuclear Regulatory Commission has begun a special inspection at the Callaway nuclear plant to review circumstances following a reactor shutdown involving the failure of three of four control valves that regulate water flow to the steam generators. The plant, operated by Ameren Missouri, is located near Fulton, Mo. Following a reactor trip on Aug. 11, all systems performed as expected, including the automatic start of a system that controls water flow to the steam generators. However, when operators tried to switch to the motor-driven water pumps, a control valve failed to operate. Internal circuitry in the control valve system had been previously modified in late 2014, apparently introducing a flaw in the design that resulted in the failure. The NRC learned that another control valve in the system had been similarly modified and also experienced a failure in December 2014. The affected valves were repaired and tested prior to the plant being restarted on Aug. 12. Additionally, the NRC is aware of a third unrelated control valve failure in the same system earlier this year that had already been corrected. the valve failures, determine if comprehensive, and  actions to ensure that the causes of the failures have  Administrator Marc Dapas said. The NRC staff determined that a special inspection is warranted because the valves provide an important function in the mitigation of selected plant events. NRC inspectors will spend about a week on site looking into change, and corrective action processes specific to these valves and the associated system. They will also evaluate t analysis and extent of condition review, and the adequacy of corrective actions. of the end of the inspection.}}

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