ENS 41152

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v t e ENS Event
14:11 Sep 15, 2004
Title	Invalid Actuation of Containment Isolation Valves
Event Description	In accordance with the requirements and guidance of 10 CFR 50.73(a)(1), a telephonic report of an invalid signal affecting containment isolation valves in more than one system is being submitted. This report is being made under 10 CFR 50.73(a)(2)(iv)(A), automatic actuation of a system listed in paragraph (a)(2)(iv)(B), in lieu of a written LER. At 0911 hours0.0105 days <br />0.253 hours <br />0.00151 weeks <br />3.466355e-4 months <br />, on 09/15/2004, while operating at full power, the plant experienced a loss of power to eight process radiation monitors. The loss of power was caused by the failure of an internal radiation monitor system power supply, PS-100. The affected radiation monitors actuated, where applicable, their associated safety and non-safety related components. The safety related components affected included eight containment isolation valves and the plant's auxiliary building special ventilation system equipment. The containment isolation valves were: - 4 steam generator blowdown system isolation valves (inside and outside containment isolation valves for each of the plant's two, 'A' and 'B' steam generators). - 4 steam generator sampling system isolation valves (inside and outside containment isolation valves for each of the plant's steam generators' sample system lines). All the components affected operated as designed. The effect on plant operation was not significant. The power supply was replaced and the ventilation systems, sampling and blowdown piping systems were realigned to normal. The power supply failure and subsequent closure signal to the noted containment isolation valves is an example of an invalid signal. No full or partial containment isolation signal was generated. None of the valve closures were needed to mitigate the consequences of the power supply failure. The investigation to determine the cause of the power supply failure continues. The licensee has informed the NRC Resident Inspector.

ENS 41152 +/-
Where
Kewaunee Wisconsin (NRC Region 3)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1009.17 h42.049 days <br />6.007 weeks <br />1.382 months <br />)
Opened:	Gary Harrington 15:21 Oct 27, 2004
NRC Officer:	Bill Huffman
Last Updated:	Oct 27, 2004
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v • d • e

v t e Emergency Notification System
Kewaunee with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2011-11-07T15:44:00 [Table view]
[ENS list for Kewaunee]

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