ENS 56094

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v t e ENS Event
22:05 Jul 28, 2022
Title	Invalid System Actuation
Event Description	The following information was provided by the licensee via fax: Auxiliary Feedwater Pump #12 actuation and isolation of the Steam Generator Blowdown for 'A', 'B' and 'C' Steam Generators. Per 10 CFR 50.73(a)(1), the telephone notification is made under 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation. On 7/28/2022 at 1705 CDT, the Unit 1 Control Room received alarm SPQD0183 'SG LO-LO LVL TRN B ACT' and actuation of the Auxiliary Feedwater Pump #12 and isolation of the Steam Generator Blowdown for 'A', 'B' and 'D' Steam Generators. This event was classified as an unplanned entry into Technical Specification Shutdown LCO equal to or less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 'Simple Restoration', due to the availability of CRMP. This alarm occurred several times and with each occurrence the alarm was short lived (1 second or less). Operations placed Auxiliary Feedwater Pump #12 in the Pull-To-Lock position to prevent starting of the pump with each alarm occurrence. During troubleshooting it was determined that SSPS Logic 'R' train was generating the intermittent alarm condition. A Logic board and a Safeguard Driver board were replaced which was identified as the possible cause. Operations performed applicable sections of the Logic test to ensure SSPS 'R' train operable. The event had no effects/consequences on the unit. The Logic board and Safeguard Driver board in SSPS 'R' train were both replaced as the possible causes, and therefore both boards were sent to Westinghouse to determine which board was at fault. The NRC Resident Inspector has been notified.

ENS 56094 +/-
Where
South Texas Texas (NRC Region 4)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+977.02 h40.709 days <br />5.816 weeks <br />1.338 months <br />)
Opened:	William Herzog 15:06 Sep 7, 2022
NRC Officer:	Michael Bloodgood
Last Updated:	Sep 7, 2022
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v • d • e

v t e Emergency Notification System
South Texas with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2022-07-28T22:05:00 [Table view]
[ENS list for South Texas]

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