ENS 40588
ENS Event | |
|---|---|
15:30 Mar 15, 2004 | |
| Title | Shutdown Required By Technical Specifications Due To Inoperable Isolation Instrumentation |
| Event Description | 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 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. At 0930 on 3/15/04, CONDITIONS C and F were entered which require system isolation in one hour. At 1025, maintenance was completed; however, all post maintenance testing was not complete. At 1030, on 3/15/04 CONDITION F was not met and CONDITION H was entered. CONDITION H requires the unit be in MODE 3 in 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in MODE 4 in 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. Since the unit was in a planned shutdown, with negative reactivity being inserted, it was unclear whether the entry into CONDITION H of Technical Specification 3.3.6.1 would have required actual insertion of negative reactivity for this situation. Thus, as a conservative action, NMPNS is reporting this event pursuant to 50.72(b)(2)(i) 'The initiation of any nuclear plant shutdown required by Technical Specifications.' The Differential flow timers were installed at 1129 on 3/15/04 with the plant in MODE 2. Operating procedures require a CHANNEL FUNCTION TEST prior to a declaration of operability, The CHANNEL FUNCTIONAL TEST is in progress. The licensee notified the NRC Resident Inspector |
| 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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WEEKMONTHYEARENS 496772013-12-26T18:01:00026 December 2013 18:01:00
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