ENS 47237

v t e ENS Event
21:00 Sep 2, 2011
Title	Intake Structure Fire Suppression System Failed Surveillance Test
Event Description	During intake structure fire suppression sprinkler system surveillance testing, Operations identified that a portion of the sprinkler system was not able to pass flow. A 14-day fire protection system impairment was entered and a continuous compensatory fire watch with backup suppression was stationed prior to removing the system from service for testing. Upon failure of the surveillance test, the impairment remained in effect and the continuous fire watch remained stationed pending investigation/repair by Maintenance. On 9/2/2011 at approximately 1600 [CDT], Mechanical Maintenance personnel informed Operations that the sprinkler suppression piping was found to be fouled and not capable of passing flow. The intake sprinkler system is relied upon in part to satisfy an exemption for the station to 10CFR50 Appendix R, Section III.G.2.B concerning separation of components in the intake structure. Based upon the intake sprinkler system being non-functional, this condition is being reported under 10CFR50.72(b)(3)(ii)(B) as an unanalyzed condition affecting plant safety systems. The licensee informed the NRC Resident Inspector.

ENS 47237 +/-
Where
Monticello Minnesota (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Time - Person (Reporting Time:+1.25 h0.0521 days <br />0.00744 weeks <br />0.00171 months <br />)
Opened:	Mark Roelike 22:15 Sep 2, 2011
NRC Officer:	Steve Sandin
Last Updated:	Sep 2, 2011
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v • d • e

v t e Emergency Notification System
Monticello with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
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