ENS 53644: Difference between revisions

v t e ENS Event
04:00 Oct 4, 2018
Title	Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment
Event Description	Degraded or unanalyzed condition due to the possibility for a postulated fire induced hot short to cause a secondary fire in a different fire area, which would be outside the boundaries analyzed for safe shutdown in calculation SSC-001 due to an unfused circuit associated with the 1M43C0001A, Diesel Generator Building Ventilation Fan. This condition is not bounded by existing design and licensing documents. Without overcurrent protection for this circuit, the potential exists that an initial fire event affecting this circuit could cause a short circuit without protection that would cause excessive current through the circuit beyond the capacity rating of the conductors. This could lead to a secondary fire in another plant area where this circuit is routed challenging the ability to achieve and maintain safe shutdown. The postulated event would affect the following fire zones: 1CC-3c (Unit 1, Division 1 4160V and 480V Switchgear Room, 620 feet 6 inch elevation), 1CC-3e (Unit 1 West Corridor North of Elevator, 620 feet 6 inch elevation), DG-1d (Hallway Diesel Generator Building 620 feet 6 inch elevation), and 1DG-1c (Unit 1, Division 1 Diesel Generator Building 620 feet 6 inch elevation). This condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B). Interim compensatory measures (i.e., fire watches) have been implemented for affected areas of the plant. The licensee has notified the NRC Senior Resident Inspector.

ENS 53644 +/-
Where
Perry Ohio (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Time - Person (Reporting Time:+8.48 h0.353 days <br />0.0505 weeks <br />0.0116 months <br />)
Opened:	Alex Hallmark 12:29 Oct 4, 2018
NRC Officer:	Dong Park
Last Updated:	Oct 4, 2018
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v • d • e

v t e Emergency Notification System
Perry with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2024-04-25T21:55:00 [Table view]
[ENS list for Perry]

@@ Line 21: / Line 21: @@
 The postulated event would affect the following fire zones: 1CC-3c (Unit 1, Division 1 4160V and 480V Switchgear Room, 620 feet 6 inch elevation), 1CC-3e (Unit 1 West Corridor North of Elevator, 620 feet 6 inch elevation), DG-1d (Hallway Diesel Generator Building 620 feet 6 inch elevation), and 1DG-1c (Unit 1, Division 1 Diesel Generator Building 620 feet 6 inch elevation).
 This condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B). Interim compensatory measures (i.e., fire watches) have been implemented for affected areas of the plant.
-The licensee has notified the NRC Senior Resident Inspector."
+The licensee has notified the NRC Senior Resident Inspector.
 | URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20181005en.html#en53644
 }}{{unit info

v t e Unit 1

Reactor critical	Critical
Scram	No
Before	Power Operation (96 %)
After	Power Operation (96 %)

ENS 53644: Difference between revisions

Latest revision as of 01:01, 24 February 2020

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ENS 53644: Difference between revisions

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