ENS 48581
ENS Event | |
|---|---|
07:18 Oct 13, 2012 | |
| Title | 60 Day Report- Invalid Specified System Actuation |
| Event Description | Event Summary: On October 13, 2012, at approximately 0218 [EST], a full reactor scram signal was received in the James A. FitzPatrick (JAF) control room. At the time of this event, the plant was in cold shutdown (Mode 4) and refueling outage 20 (R20) was in progress. The scram signal occurred because Reactor Vessel Scram & Primary Containment Isolation Level Transmitter (02-3LT-101C) and Reactor Vessel Scram & Primary Containment Isolation Level Transmitter EQ (02-3LT-101D) momentarily failed downscale, and then immediately recovered.
02-3LT-101C is an 'A' division component and 02-3LT-101D is a 'B' division component. Therefore, both the 'A' and 'B' divisions of reactor protection actuated providing a full reactor scram and outboard primary containment isolation signal. AOP-15, 'Isolation Verification and Recovery' verified that the proper containment isolation response was received. This event is reportable under 10 CFR 50.73(a)(2)(iv)(A) because it resulted in the invalid actuation of the reactor protection system while the reactor was already shut down. Apparent Cause: A Failure Mode Analysis and Apparent Cause Evaluation were performed to determine the most likely cause of both level transmitters to momentarily spike downscale. It was concluded that the most probable cause was due to a worker inadvertently coming into contact with the level transmitters' exposed sensing lines. Contributing to this event was the misjudgment by the Operations individual reviewing the work package, on the risk significance of the instrumentation in the vicinity of the work area. As a result, the work area was not constructed in a manner to preclude interference with the level transmitters or associated sensing lines. Corrective Actions: Immediate corrective actions were to walk down the affected instrument lines to ensure no damage had been caused. Additional corrective actions were to install signs near the level transmitters and exposed sensing lines. The signs denote that sensitive instrument lines are present. Future corrective actions include a walk down by engineering and operations to identify other areas in the plant where sensitive instrument lines are present and place additional signs or barriers as appropriate. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Fitzpatrick  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1444.2 h60.175 days <br />8.596 weeks <br />1.978 months <br />) | |
| Opened: | Henk Verwey 12:30 Dec 12, 2012 |
| NRC Officer: | Vince Klco |
| Last Updated: | Dec 12, 2012 |
| 48581 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 526452017-01-31T19:25:00031 January 2017 19:25:00
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