ENS 48263

v t e ENS Event
14:40 Aug 31, 2012
Title	High Pressure Core Spray Diesel Generator Declared Inoperable
Event Description	This report is being made pursuant to 10CFR50.72(b)(3)(v)(D), Event or Condition that could have prevented fulfillment of a Safety Function needed to Mitigate the Consequences of an Accident. During the conduct of the Unit 2 Division 3 High Pressure Core Spray (HPCS) Diesel Generator (DG) air start system receiver blowdown, a low air pressure system alarm was received. Starting air pressure in one of 2 redundant air receiver banks lowered to the point requiring the DG to be declared inoperable per Technical Specifications. This event appears to have been caused by a degraded receiver drain valve. The air system degraded equipment condition has cleared and the DG has been restored to operable status following 42 minutes of inoperability. Although a redundant air bank was fully available and charged, during this time of inoperability the DG was at reduced margin to successfully start if required. Due to this loss of margin and inoperable condition, it has been determined that this failure could potentially affect the safety function of this system, and is being reported as an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> ENS notification. The licensee informed the NRC Resident Inspector.

ENS 48263 +/-
Where
Lasalle Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
LER:	05000374/LER-2012-001
Time - Person (Reporting Time:+3.17 h0.132 days <br />0.0189 weeks <br />0.00434 months <br />)
Opened:	Rudy Caputo 17:50 Aug 31, 2012
NRC Officer:	Steve Sandin
Last Updated:	Aug 31, 2012
48263 - NRC Website
v • d • e

v t e Emergency Notification System
LaSalle with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2023-04-17T07:46:00 [Table view]
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