Automatic shutdown at Pilgrim Nuclear Plant Saturday

Main steam isolation valve closes prompting showdown

With the reactor at full power, the Pilgrim Nuclear Power Plant went into automatic shutdown Saturday afternoon. According to a release from Entergy, the company that owns Pilgrim, the shutdown occurred around 4:30 p.m.

The automatic shutdown was prompted by the closure of a single main steam isolation valve (MSIV). Four main steam lines carry steam from the reactor to the turbine-generator and the valve automatically isolates the reactor from the turbine-generator, the release said.

"All other plant systems responded as designed," said Lauren Burm, Senior Communications Specialist at Pilgrim. 

Entergy is investigating the cause of the MSIV closure. 

The Pilgrim Nuclear Power Plant is currently shutdown. The release did not indicate how long the plant will remain disconnected from the grid.  

The last unplanned shutdown, or scram, at the Plymouth plant occurred in May. welcomes thoughtful comments and the varied opinions of our readers. We are in no way obligated to post or allow comments that our moderators deem inappropriate. We reserve the right to delete comments we perceive as profane, vulgar, threatening, offensive, racially-biased, homophobic, slanderous, hateful or just plain rude. Commenters may not attack or insult other commenters, readers or writers. Commenters who persist in posting inappropriate comments will be banned from commenting on