ENS 55620

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v t e ENS Event
06:00 Dec 1, 2021
Title	Part 21 - 15V and 48 V Power Supply Defect
Event Description	This is a non-emergency notification required by 10 CFR 21.21(d)(3)(i). A written notification in accordance with 10 CFR 21.21(d)(3)(ii) will be provided in 30 days. On November 10, 2021, Callaway Plant received written notification from Paragon Energy Solutions, LLC, pursuant to 10 CFR 21.21(b), which identified a deviation associated with the DC/DC converter in two power supplies, NLI-STM15-15M20 (15 VDC) and NLI-STM48-14M20 (48 VDC) that had been sent to Paragon for evaluation and failure analysis following failures of individual components within the power supplies at Callaway Plant. The notification identified the following failed components: For the NLI-STM15-15M20 [15 VDC] power supply, the failed components were the Vicor Module, P/N: V150A28C500BL, and the DC/DC Converter, Murata P/N: NKE1212SC, Date code: G1511 For the NLI-STM48-14M20 [48 VDC] power supply, the failed component was the DC/DC Converter, Murata P/N: NKE1212SC, Date code: G1511 Fourteen of these power supplies (in total) are used in three Balance of Plant Engineered Safety Feature Actuation System (BOP-ESFAS) cabinets and two Load Shed and Emergency Load Sequencer (LSELS) cabinets. Based upon the 10 CFR 21.21(b) transfer from Paragon Energy Solutions, Callaway Plant has determined that a Substantial Safety Hazard could be created by the failure of the power supplies. The responsible officer was notified on December 1, 2021. The NRC Resident Inspector at Callaway Plant has been notified.

ENS 55620 +/-
Where
Ameren Ue Fulton, Missouri (NRC Region 4)
Organization:	Callaway
Reporting

10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+31.6 h1.317 days <br />0.188 weeks <br />0.0433 months <br />)
Opened:	Todd Witt 13:36 Dec 2, 2021
NRC Officer:	Mike Stafford
Last Updated:	Dec 2, 2021
55620 - NRC Website
v • d • e

v t e Emergency Notification System
Ameren Ue with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2021-12-01T06:00:00 [Table view]
[ENS list for Ameren Ue]

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