ENS 41948
ENS Event | |
|---|---|
20:30 Aug 25, 2005 | |
| Title | High Pressure Coolant Injection Inoperable Due to Flow Oscillations |
| Event Description | This report is being made in accordance with 10CFR50.72 (b) (3) (v) due to the High Pressure Coolant Injection (HPCI) system being declared inoperable. HPCI was declared inoperable on 8/25/05 at 1630 EST due to oscillations at below rated flow during the scheduled operability testing. HPCI was restored to standby line-up when testing was completed and remains available for use. This event is an eight hour notification. Efforts are on going to determine the cause of the oscillations on the Flow Controller. This event had no adverse effect to the health and safety of the public.
The resident NRC inspector has been notified of this event.
This follow-up notification is being made to retract the notification made to the NRC Operations Center on 8/25/05 at 2039 hours0.0236 days <br />0.566 hours <br />0.00337 weeks <br />7.758395e-4 months <br /> (notification #41948). The initial report was made in accordance with 10 CFR 50.72(b)(3) due to the HPCI system being declared inoperable. The system was declared inoperable due to oscillations in turbine speed, pump discharge pressure, and pump flow during a quarterly surveillance test of the HPCI pump. Further investigation and evaluation of this has been performed. The cause of the noted oscillations was the position of a hand operated valve that is located in the HPCI system full flow test line. The hand operated valve is located downstream of an in-series motor operated valve that automatically closes if an automatic HPCI system initiation signal occurs. The full flow test line is not part of the HPCI injection pathway to the reactor vessel. As a result, the position of this valve would not have impacted the ability of the system to perform its design function. After adjusting the position of the hand operated valve, the surveillance test of the HPCI pump was completed with satisfactory results. The evaluation has determined that the HPCI system was capable of performing the designed safety function. Therefore, the HPCI system was not inoperable and event notification #41948 is retracted. The licensee notified the NRC Resident Inspector. Notified R1DO (C. Cahill) |
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+0.15 h0.00625 days <br />8.928571e-4 weeks <br />2.0547e-4 months <br />) | |
| Opened: | Francis Clifford 20:39 Aug 25, 2005 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Sep 27, 2005 |
| 41948 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |