18 septembre 2014
Des barres de contrôle étaient à une insertion de 217 pas alors qu’elles étaient indiquées insérées entre 195 à 200 pas. Avant l’arrêt, la puissance du réacteur a été baissée de 32 %.
Type : PWR - Puissance : 3 216 MWth - Première divergence : 05/1973
Available in english only.
Power Reactor Event Number : 50467
Facility : INDIAN POINT - State : NY - Unit : [2] - RX Type : [2] W-4-LP -
Event Date : 09/18/2014 - Event Time : 11:50
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(i) - PLANT S/D REQD BY TS
Initial PWR : 100 % Current PWR : 68 %
Event Text
TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO MISALIGNED CONTROL ROD
"During the performance of PT-Q89, Control Rod Exercise Test, Rod G-3 in Shutdown Bank ’B’ misaligned (stepped in) to approximately 195-200 steps indicated with group demand at 217 steps. The movable gripper fuse was suspect, found not blown [so further] troubleshooting required. At 1150 [EDT], the decision was made to reduce power to approximately 70% within two hours per I.T.S. [Improved Technical Specification] 3.1.4.b.2.2. The plant is currently stable at 68% power. I.T.S. 3.1.5.b.1 was also entered for Shutdown Bank ’B’ less than allowable insertion limits at time 1228 [EDT] to be in Mode 3 in 6 hrs. (1828 [EDT])." Service Commission and the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140919en.html