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Nuclear Event – Potential Uncontrolled Radiation Release: Pilgrim Nuclear Power Station, Plymouth, MA

2016/07/01

Technological Hazard (Nuclear Event) – Nuclear Reactor Shutdown

North America – USA | State of Massachusetts, Pilgrim Nuclear Power Station
Location: 41°56’42.0″N 70°34’42.0″W
Present Operational Age: ~44 years
Event: POT UNCNTRL RAD REL –  ACCIDENT MITIGATION

Nuclear Event in USA on Thursday, 30 June, 2016 at 14:30 [EDT].

BOTH PRIMARY CONTAINMENT ISOLATION VALVES FOR A PENETRATION POTENTIALLY INOPERABLE

“On June 30, 2016 at 1430 [EDT], with the reactor at 100 [percent] and the mode switch in RUN, Pilgrim Station determined both Primary Containment Isolation Valves (PCIVs) CV-5065-91 and CV-5065-92 for Drywell Penetration X-32A were inoperable due to the potential failure of relays relied on to perform the primary containment isolation function.

“The valves have been closed and deactivated in the isolated condition in accordance with Technical Specification Limiting Condition For Operation Action Statement 3.7.A.2.b.

“Preparations are in progress to replace the relays to restore the valves to operable status.

“This 8-hour notification is being made in accordance with 10 CFR 50.72 (b)(3)(v)(C) and 10 CFR 50.72 (b)(3)(v)(D).

“The licensee has notified the NRC Senior Resident Inspector.

“The licensee will notify the Commonwealth of Massachusetts.”

Source: NRC  Event Number: 52056
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Previous events

Nuclear Event in USA on Thursday, 12 May, 2016 at 16:47 [EDT] DETERIORATION OF SPENT FUEL POOL RACK NEUTRON ABSORBING MATERIAL

Nuclear Event in USA on Saturday, 22 August, 2015 at 16:28 [EDT]. REACTOR SCRAM DUE TO A SINGLE MSIV CLOSURE

Nuclear Event in USA on Friday, 22 May, 2015 at 10:02 [EDT]. MANUAL REACTOR SCRAM DUE TO LOSS OF CONDENSER VACUUM

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