ENS 48182: Difference between revisions

v t e ENS Event
08:18 Aug 12, 2012
Title	Degraded Condition Reported Based on the Discovery of Pressure Boundary Leakage
Event Description	Following a planned shutdown to investigate the source of elevated Primary Coolant System (PCS) Unidentified Leakage, the Mode 3 PCS walk-down identified a steam leak on CRD-24, Control Rod Drive Mechanism (CRD), pressure housing. The leak is ~ 1 foot above the CRD to Reactor Head flange. The leak was observed from the Refueling floor deck and appears to be coming from an area of the CRD with no bolted connections. Leakage from this area is unexpected and the mechanism of failure is not understood at this time. Closer examination of the leak is expected to occur in parallel with plant cool-down. The plant entered T.S. 3.4.14 (PCS Operational Leakage) Condition B. at 0418 EDT hours this morning and this requires the plant to be placed in Mode 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The leakage is considered Pressure Boundary Leakage. Operations is in progress of performing the plant cool-down from Mode 3 to Mode 5. The licensee discovered this condition following a shutdown the morning of 8/12/12 to investigate unidentified primary coolant leakage of about 0.3 gpm that had been recently trending upwards. Plant conditions are currently 400 degrees F with primary system pressure at about 1000 psi. The licensee has notified the NRC Resident Inspect

ENS 48182 +/-
Where
Palisades Michigan (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
Time - Person (Reporting Time:+2.78 h0.116 days <br />0.0165 weeks <br />0.00381 months <br />)
Opened:	Todd Mulford 11:05 Aug 12, 2012
NRC Officer:	Bill Huffman
Last Updated:	Aug 12, 2012
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v • d • e

v t e Emergency Notification System
Palisades with 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
WEEKMONTHYEAR		Degraded Condition 2020-09-11T23:30:00 [Table view]
[ENS list for Palisades]

@@ Line 16: / Line 16: @@
 | event date = 08/12/2012 04:18 EDT
 | last update date = 08/12/2012
-| title = Degraded Condition Reported Based On The Discovery Of Pressure Boundary Leakage
+| title = Degraded Condition Reported Based on the Discovery of Pressure Boundary Leakage
 | event text = Following a planned shutdown to investigate the source of elevated Primary Coolant System (PCS) Unidentified Leakage, the Mode 3 PCS walk-down identified a steam leak on CRD-24, Control Rod Drive Mechanism (CRD), pressure housing.  The leak is ~ 1 foot above the CRD to Reactor Head flange.  The leak was observed from the Refueling floor deck and appears to be coming from an area of the CRD with no bolted connections.  Leakage from this area is unexpected and the mechanism of failure is not understood at this time.  Closer examination of the leak is expected to occur in parallel with plant cool-down.
 The plant entered T.S. 3.4.14 (PCS Operational Leakage) Condition B. at 0418 EDT hours this morning and this requires the plant to be placed in Mode 5 within 36 hours.  The leakage is considered Pressure Boundary Leakage. Operations is in progress of performing the plant cool-down from Mode 3 to Mode 5.

Latest revision as of 21:03, 1 March 2018