ENS 57988: Difference between revisions

ENS 57988 +/-
Where
	Engine Systems, Inc ; Rocky Mount, North Carolina (NRC Region 1)
Organization:	Engine Systems, Inc
Reporting
	10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+1182.1 h49.254 days <br />7.036 weeks <br />1.619 months <br />)
Opened:	Dan Roberts; 10:06 Oct 15, 2025
NRC Officer:	Ernest West
Last Updated:	Oct 15, 2025
	57988 - NRC Website
	v • d • e

Revision as of 06:20, 16 October 2025

v t e ENS Event
04:00 Aug 27, 2025
Title	Part 21 - Power Driven Potentiometer with Loose Relay Sockets
Event Description	The following is a summary of information provided by Engine Systems Inc. (ESI) via email: Relay sockets used to retain relays 'K1' and 'K2' on a power driven potentiometer (PDP), part number: ESI 50258, were found to have low retention force. Without both relays installed, the raise and lower function of the PDP is inoperable, thus preventing adjustment of the generator output voltage. There is a scenario where if the PDP is adjusted to a value other than the normal voltage setpoint and if the K1 or K2 relays were to dislodge during a subsequent emergency event, the PDP would not return to its preposition setpoint and therefore the generator terminal voltage would not return to its desired voltage setpoint, in which case the ability of the emergency diesel generator to carry its safety-related loads could be impacted Affected Plants Region 3: Prairie Island ESI contact information: Dan Roberts Quality Manager Engine Systems Inc 175 Freight Rd 175 Rocky Mount, NC 27804

v t e Emergency Notification System
Engine Systems, Inc with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2025-08-27T04:00:00 [Table view]
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