said by W1RFI :

The time-signal sychronized clocks use the 60 kHz WWVB signals, as a rule. These will not be affected by BPL.

Ed Hare, ARRL

Like every watch and clock that sets itself using the time signals. Might PO a few people.

said by alphapointe :

Atomic watches and clocks set their time via WWVB, a 60khz signal. The news item is referring to the AM stations in the shortwave bands, like WWV at 2.5, 5, 10, 15, and 20MHz.

This will not affect atomic clocks/watches at all.

EDIT:
Here is WWV's web site:
»tf.nist.gov/stations/wwv.html