ENS 50517: Difference between revisions

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Latest revision as of 21:49, 1 March 2018

v t e ENS Event
00:00 Oct 8, 2014
Title	Ultrasonic Testing Reveal Degraded Condition on One Control Rod Drive Mechanism Penetration
Event Description	In accordance with 10 CFR 50.72(b)(3)(ii)(A), this notification reports a degraded condition on Byron Station Unit 2 that occurred on October 7, 2014, when it was determined that the results of planned ultrasonic testing (UT) examinations performed on one CRDM penetration of the reactor vessel head would not meet the applicable acceptance criteria. Byron Station Unit 2 is presently in day eight of a refueling outage. The examinations were being performed to meet the requirements of 10 CFR 50.55a(g)(6)(ii)(D) and ASME Code Case N-729-1 to ensure the structural integrity of the reactor vessel head pressure boundary. The UT examinations continue for the remaining CRDM head penetrations. The repairs are currently being planned and will be completed prior to unit start-up. The NRC Resident Inspector has been notified of this condition.

ENS 50517 +/-
Where
Byron Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
Time - Person (Reporting Time:+-2.63 h-0.11 days <br />-0.0157 weeks <br />-0.0036 months <br />)
Opened:	Charles Berger 21:22 Oct 7, 2014
NRC Officer:	Dong Park
Last Updated:	Oct 7, 2014
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v • d • e

v t e Emergency Notification System
Byron with 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
WEEKMONTHYEAR2022-04-23T13:54:00 [Table view]
[ENS list for Byron]

@@ Line 16: / Line 16: @@
 | event date = 10/07/2014 19:00 CDT
 | last update date = 10/07/2014
-| title = Ultrasonic Testing Reveal Degraded Condition On One Control Rod Drive Mechanism Penetration
+| title = Ultrasonic Testing Reveal Degraded Condition on One Control Rod Drive Mechanism Penetration
 | event text = In accordance with 10 CFR 50.72(b)(3)(ii)(A), this notification reports a degraded condition on Byron Station Unit 2 that occurred on October 7, 2014, when it was determined that the results of planned ultrasonic testing (UT) examinations performed on one CRDM penetration of the reactor vessel head would not meet the applicable acceptance criteria. Byron Station Unit 2 is presently in day eight of a refueling outage. The examinations were
 being performed to meet the requirements of 10 CFR 50.55a(g)(6)(ii)(D) and ASME Code Case N-729-1 to ensure the structural integrity of the reactor vessel head pressure boundary. The UT examinations continue for the remaining CRDM head penetrations. The repairs are currently being planned and will be completed prior to unit start-up.