They repeat “high high” twice, so it must not be a typo and must be or have been very bad.
Browns Ferry, USNRC:
UNUSUAL EVENT DECLARED DUE TO MAIN STEAMLINE HIGH HIGH RADIATION CONDITION
At 1545 CDT on 04/06/16 Browns Ferry Unit 3 declared and exited the declaration of an unusual event due to a main steam line high high radiation condition. Power to Unit 3 was reduced to 91 percent power. The high radiation condition alarm cleared at 1526 CDT. Browns Ferry Unit 3 reported that the high radiation conditions were due to resin intrusion from the condensate demineralizers into the reactor and hydrogen water chemistry was a potential contributor to the event. The cause is still under investigation.

The NRC Resident Inspector has been notified.

State and Local notifications were made.

Notified DHS SWO, FEMA Ops Center, NICC Watch Officer, FEMA NWC and Nuclear SSA (email).
* * * UPDATE FROM BILL BALL TO DANIEL MILLS AT 0034 EDT ON 04/07/2016 * * *
“At 1941 [CDT] BFN [Brown’s Ferry] determined this notification to be potentially newsworthy due to receiving notification that counties [surrounding the plant] were alerted of this event. No plant conditions changed.
http://www.nrc.gov/reading-rm/doc-collections/event-status/event/en.html
TVA map Brown's Ferry
Browns Ferry Nuclear TVA
Here’s the original US NRC notification (click images to enlarge):
Browns Ferry April 6 2016 high radiation event
Browns Ferry Boiling Water Reactor
Browns Ferry BW Reactor Torus
Additional Information Related to Browns Ferry:
Brown's Ferry 3 PT comment
NRC STAFF ISSUES ORDER TO FORMER CONTRACT FOREMAN FOR DELIBERATE MISCONDUCT AT BROWNS FERRY NUCLEAR PLANT.  April 13, 2007.