Tension has been high for months over North Korea's nuclear and missile development, and due to fears it will conduct a sixth nuclear test and more ballistic missile launches in defiance of U.N. Security Council resolutions.
Asia's first Winter Olympics outside Japan will see South Korea's alpine town of Pyeongchang and the coastal city of Gangneung host thousands of athletes and officials when the Games start in February.
"There are obviously geopolitical issues," Zenkel said, speaking by telephone. "I don't think there's an Olympics or any global sporting event without them.
"We're all aware of the issues facing that particular location and we're playing close attention and staying in touch with the different organizations and the experts we have access to," Zenkel said, adding the network gets information from the U.S. State Department.
NBC, a unit of Comcast Corp, is the U.S. exclusive broadcaster for the Olympics, and it usually uses the games to host its best advertisers and clients on site.
It hosted hundreds of clients in Sochi in 2014 and about 1,500 in Rio last year.
In South Korea, however, NBC would not be inviting guests to the Games and would instead be hosting them in the U.S. ski town of Jackson Hole, Wyoming, Zenkel said.
Contrary to media reports, Zenkel said NBC made that decision as far back as 2014, and it was because of limited accommodations near the Olympic venues, unrelated to any security concerns.
NBC's priority was finding housing for its workers, many of whom are coming from abroad, Zenkel said. Clients who want to go can still be invited by sponsors which are doing hospitality at the Games, he added.
A 13-hour time difference between New York and South Korea could actually work to NBC's advantage for showing live events such as skiing and figure skating in U.S. prime time, Zenkel said, adding that events for U.S. ski racers Lindsey Vonn and Mikaela Shiffrin should be a draw.
"The events in morning or early afternoon will take place in prime time when our largest audience comes together," he said.
(Reporting by Liana B. Baker in San Francisco; Editing by Peter Rutherford)
