Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 51338 | 22 August 2015 20:14:00 | On Saturday, August 22, 2015, at 1628 (EDT), with the reactor at 100% core thermal power (CTP) the Pilgrim Nuclear Power Station (PNPS) experienced an automatic reactor scram signal due to the rapid closure of one main steam isolation valve (MSIV). Other than the MSIV all other plant systems responded as designed. Plant cooldown is in progress using steam bypass to the main condenser. The plant is in hot shutdown. The cause of the MSIV closure is still under investigation. This event has no impact on the health and safety of the public. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), 'Any event that results in actuation of the reactor protection system (RPS) when the reactor is critical'. Subsequent to the reactor scram the plant experienced the following isolation signals: - Group 2 Isolation: Miscellaneous containment isolation valves
- Group 6 Isolation: Reactor Water Clean-up
- Reactor Building Isolation Actuation
This notification is also being made in accordance with 10 CFR 50.72(b)(3)(iv)(A), 'Any event or condition that results in valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B) of this section' (B)(2) 'General containment isolation signals affecting containment isolation valves in more than one system or multiple main steam isolation valves (MSIVs).' Plant response was considered normal and the plant is in a stable shutdown / cooldown condition. The license will be notifying the Commonwealth of Massachusetts. |
| ENS 51301 | 9 August 2015 20:15:00 | On Sunday, August 9, 2015 at 1627 (EDT), with the reactor at 90 percent core thermal power (CTP), the Pilgrim Nuclear Power Station (PNPS) entered a 24-hour shutdown Limiting Condition for Operation Action Statement (LCO-AS) for Salt Service Water (SSW) inlet temperature exceeding the Technical Specification (TS) limit in TS 3.5.B.4. The LCO-AS was subsequently exited at 1653 when the temperature of SSW trended to below the TS limit. Under certain accident conditions, the SSW system is required to provide cooling water to various heat exchangers such as the Reactor Building Closed Cooling Water (RBCCW) and Turbine Building Closed Cooling Water (RBCCW) systems. When the inlet temperature to these supplied loads exceeds the 75 degrees F limit established in the TS, the SSW system is conservatively declared inoperable until the temperature trends below this value. This condition existed for approximately 1/2 hour. When the SSW system was declared operable, the LCO-AS was exited. The SSW temperature is being closely monitored and trended on a continuous basis. This event has no impact on the health and safety of the public. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b) (3) (v) (D) due to an event or condition that could have prevented fulfillment of a safety function. The licensee will be notifying the Commonwealth of Massachusetts Emergency Management Agency. The licensee returned the unit to 100 percent power at approximately 2000 EDT. |
| ENS 49187 | 11 July 2013 19:49:00 | A non-licensed employee supervisor had a confirmed positive for a banned substance during a random fitness-for-duty test. The employee's access to the plant has been terminated pending an ongoing investigation. The licensee informed the NRC Resident Inspector. |
| ENS 47927 | 16 May 2012 21:06:00 | On May 18, 2012, at 2100 (EDT) hours and the reactor at 100% core thermal power the following press release is being issued by Entergy Nuclear regarding the status of the ongoing labor negotiations. Plymouth, Mass -- Entergy Nuclear, the owner and operator of the Pilgrim Nuclear Power Station in Plymouth, Mass. said today that the company remains focused squarely on plant safety as a negotiating team works toward a four-year contract with plant workers that reflects the realities of the competitive electric power business and fairly compensates the workforce. The contract with the Utility Workers Union of America Local 369 covers approximately 240 production and maintenance/office technical and professional workers out of a total workforce of about 650 employees at the plant. The contract expired May 15 without final resolution. Plant management directed workers covered by the contract in non-essential positions to remain at home Wednesday with full pay with benefits and insurance pending further progress on the contract. It is not a lockout. The management decision to temporarily limit the workforce at the plant is in the interest of safety. The company remains prepared to implement contingency plans in the event of a strike by the union members. Those plans assign routine tasks to other pre-qualified workers in roles that ensure continued safe operations. The Resident Inspector staff is onsite and has been informed of this press release and notification. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi). The company feels they have adequate numbers of pre-qualified workers available to fill necessary positions to ensure continued safe operations. |
| ENS 47492 | 30 November 2011 22:09:00 | On November 30, 2011, at 1747 hours (EST), with the reactor at 100% core thermal power and steady state conditions, Pilgrim Nuclear Power Station (PNPS) declared the High Pressure Coolant Injection (HPCI) system inoperable due to the HPCI turbine control valve (HPCI-24) failing to go open during planned post-maintenance testing. The HPCI-24 is a hydraulically operated control valve and its normal position is closed. The HPCI-24 valve has a safety function to open on a demand signal during certain event mitigation scenarios requiring the HPCI system operation. Based on the turbine control valve failing to open during post-maintenance testing and a subsequent check out run per PNPS Procedure 8.5.4.1, the HPCI system was declared inoperable at 1747 hours and the appropriate LCO was entered. An investigation of the event is underway and continuing. This event had no impact on the health and/or safety of the public. The NRC Resident Inspector bas been notified. This is an 8-hour notification made in accordance with 50.72(b)(3)(v)(D). |