Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 48187 | 14 August 2012 10:40:00 | On Monday, August 13, 2012, analyses of samples taken from groundwater inleakage to the Nine Mile Point Unit 1 (NMP1) Screenhouse building confirmed the presence of tritium at concentrations of approximately 32,000 to 44,000 picocuries per liter (pCi/l). This discovery was made during the conduct of the site's ongoing groundwater monitoring program. These concentrations are above the 30,000 pCi/l threshold for voluntary reporting for a non-drinking water pathway, as indicated in Nuclear Energy Institute (NEI) 07-07, Industry Ground Water Initiative - Final Guidance Document. These test results do not indicate any threat to public health or safety, since the building inleakage is not a drinking water source, and there is no indication that tritium has migrated off the Nine Mile Point site in the groundwater. Nine Mile Point Nuclear Station, LLC, is continuing an investigation to identify the source of tritium and implement a corrective action plan. Voluntary notification of this discovery has been made to the New York State Department of Environmental Conservation and the New York State Department of Health. The licensee has notified the NRC Resident Inspector. |
| ENS 46248 | 13 September 2010 12:35:00 | This is an eight hour report per 10 CFR 50.72 (b)(3)(xiii). Nine Mile Point is implementing a scheduled modification to reroute telephone cables as part of a planned Interim Spent Fuel Storage (ISFSI) modification. This rerouting will enable construction of the roadway to the ISFSI storage location and ensure no damage to telephone cables which currently pass through the roadway. The re-routing will ensure that no cabling important to control room and or TSC will pass under the roadway This work required that all Federal Telephone System (FTS) 2001 lines including Emergency Notification System (ENS), Health Physics Network (HPN) and Emergency Response Data System (ERDS) be removed for a period of approximately 1 hour. During the upgrade starts only 5 circuits were removed at a time and tested upon completion of re-routing. There was at least 2 alternate means of communication (via commercial telephone lines) continuously available. If an emergency had been declared during this period, the Control Room had the capability to make the notification to the offsite agencies using commercial telephone lines. The emergency preparedness communications procedure provides adequate instructions for use of these backup means. The Nine Mile Point procedures provide for alternate means of emergency assessment capability. All work associated with this modification was performed in an expeditious manner consistent with the goal of minimizing unavailability of the systems listed above. A test of all systems will be performed at the completion of the upgrade. All Control Room personnel have been briefed on this work and expected contingent actions. This job began on Monday, September 13, 2010 at approximately 1031 (EDT) and was completed at 1153 (EDT). The licensee notified the NRC Resident Inspector. |
| ENS 45412 | 5 October 2009 14:41:00 | At 1158 on Monday, October 5, 2009, Nine Mile Point Unit One was manually scrammed from approximately 100% rated power due to failure of the Feedwater Level Control System, in anticipation of a reactor scram. Following the manual scram insertion at 11:58, High Pressure Coolant Injection (HPCI) System automatically initiated on low Reactor Vessel (RPV) level. At 11:59, RPV level was restored above the HPCI System low level actuation setpoint, and the HPCI System initiation signal was reset. At Nine Mile Point Unit One, a HPCI System actuation signal on low RPV level is normally received following a reactor scram, due to level shrink. Unit 1 has commenced cooldown, in preparation for the forced outage to commence repairs. Reactor water level is being controlled in the normal operating band; reactor temperature is 450?F and reactor pressure is approximately 500 psig. 10 CFR 50.72(b)(2)(iv)(B) requires reporting within 4 hours when any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical. 10 CFR 50.72(b)(3)(iv)(A) requires reporting within 8 hours when a valid actuation of the High Pressure Coolant Injection System occurs. All control rods fully inserted. All systems functioned as required following the reactor scram. The reactor is currently stable in Mode 3. HPCI has been secured. Makeup water is being provided by the Reactor Feedwater System and decay heat removal is through the bypass valves to the condenser. There was no impact on Unit 2 and the plant is in a normal post-scram electrical lineup. The licensee notified the NRC Resident Inspector. |
| ENS 45031 | 30 April 2009 00:48:00 | At 2230 on April 29, 2009, with Nine Mile Point Unit 1 and Unit 2 operating at 100% reactor power, Oswego County Emergency Management notified the Unit 1 and Unit 2 Control Rooms that the National Weather Service had notified them that the Tone Alert Radios had been out of service since 1938 (on 4/29/09). At 0015 on April 30, Oswego County Emergency Management notified the Control Rooms that the Tone Alert Radios had been restored to service as of 0012, April 30, 2009. This impacted the ability to readily notify a portion of the Emergency Planning Zone (EPZ) Population for the Nine Mile Point and JAF (James A. FitzPatrick see EN# 45030) Nuclear Power Plants. This failure meets NRC 8 hour reporting criterion 10 CFR 50.72(b)(3)(xiii). The County Alert Sirens which also function as part of the Public Prompt Notification System remained operable. The loss of the Tone Alert Radios constitutes a significant loss of emergency offsite communications capability. Compensatory measures were verified to be available should the Prompt Notification System be needed. This consists of utilizing the hyper reach system which is a reverse 911 feature available from the county 911 center. Local Law Enforcement Personnel are also available for 'Route Alerting' of the affected areas of the EPZ. The event has been entered into the corrective action program, and the (NRC) Resident Inspector has been briefed, and the state PSC will also be notified. |