ENS 55244

v t e ENS Event
05:00 May 5, 2021
Title	Part 21 - Power Range Neutron Monitor System Defect
Event Description	The following is a summary of information received via email from Monticello Nuclear Generating Plant (MNGP): On March 9, 2021, GE Hitachi (GEH) issued Safety Communication SC 21-02 for PRC 21-02, Transfer of Information, Revision 0, pursuant to 10 CFR 21.21(b). Monticello Nuclear Generating Plant (MNGP) was listed as a potentially affected plant. This is a deviation from the Power Range Nuclear Monitor (PRNM) Licensing Topical Report, NEDC 32410P-A. On May 5, 2021, MNGP completed an evaluation of this deviation and concluded this condition represents a substantial safety hazard in that the condition could result in an Average Power Range Monitoring (APRM) flux reading either below or above the Technical Specification (plus/minus) 2% band. The condition is a defect that is reportable pursuant to 10 CFR 21.21(d)(4). The GEH NUMAC PRNMS was installed in 2009 with System Part No. 299X739NF. Name and Address of the Individual or Individuals Informing the Commission: Thomas A. Conboy, Site Vice President Monticello Nuclear Generating Plant Northern States Power Company - Minnesota 2807 West County Road 75 Monticello, MN 55362 The licensee notified the NRC Resident Inspector.

ENS 55244 +/-
Where
Monticello Minnesota (NRC Region 3)
Reporting

10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+60.35 h2.515 days <br />0.359 weeks <br />0.0827 months <br />)
Opened:	Gustavo Hernandez 17:21 May 7, 2021
NRC Officer:	Bethany Cecere
Last Updated:	May 7, 2021
55244 - NRC Website Loading map...
v • d • e

v t e Emergency Notification System
Monticello with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2021-05-05T05:00:00 [Table view]
[ENS list for Monticello]

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