ENS 40588: Difference between revisions
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| event date = 03/15/2004 10:30 EST | | event date = 03/15/2004 10:30 EST | ||
| last update date = 03/15/2004 | | last update date = 03/15/2004 | ||
| title = Shutdown Required | | title = Shutdown Required by Technical Specifications Due to Inoperable Isolation Instrumentation | ||
| event text = During the planned shutdown for RFO9, the Reactor Water Clean Up (RWCU) Differential Flow Signals and the Reject Flow indicator did not receive a signal from the transmitters associated with the reject flow path from the reactor to the condenser in the RWCU system. Maintenance was contacted and the differential flow timers associated with these control loops were removed per operating procedure N2-OP-37 for the RWCU system and the Technical Specification Required Action for both required channels of Functions 4a and 4b in table 3.3.6.1-1 being inoperable was entered. This was required to allow venting of the transmitters and prevented an inadvertent isolation signal of the RWCU system. | | event text = During the planned shutdown for RFO9, the Reactor Water Clean Up (RWCU) Differential Flow Signals and the Reject Flow indicator did not receive a signal from the transmitters associated with the reject flow path from the reactor to the condenser in the RWCU system. Maintenance was contacted and the differential flow timers associated with these control loops were removed per operating procedure N2-OP-37 for the RWCU system and the Technical Specification Required Action for both required channels of Functions 4a and 4b in table 3.3.6.1-1 being inoperable was entered. This was required to allow venting of the transmitters and prevented an inadvertent isolation signal of the RWCU system. | ||
These primary containment isolation instruments were declared inoperable at 0830 on 3/15/2004. CONDITION B of LCO 3.3.6.1 was entered, which requires isolation capability to be restored in 1 hour. At 0930 on 3/15/04, CONDITIONS C and F were entered which require system isolation in one hour. | These primary containment isolation instruments were declared inoperable at 0830 on 3/15/2004. CONDITION B of LCO 3.3.6.1 was entered, which requires isolation capability to be restored in 1 hour. At 0930 on 3/15/04, CONDITIONS C and F were entered which require system isolation in one hour. | ||
Latest revision as of 21:23, 1 March 2018
| Where | |
|---|---|
Nine Mile Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-1.28 h-0.0533 days <br />-0.00762 weeks <br />-0.00175 months <br />) | |
| Opened: | Glenn Bridges 14:13 Mar 15, 2004 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Mar 15, 2004 |
| 40588 - NRC Website
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