Japanese power firm Tokyo Electric Power company (TEPCO) might close down operations at its 1,356MW No.7 nuclear reactor at the Kashiwazaki-Kariwa power station following problems at the site.
The company said it could shut down after a leaking fuel rod was detected in July.
TEPCO has not stated the duration of the possible closure, but previous similar work has taken about one month to complete.
The number 7 reactor was the first at the plant to resume operations following an earthquake in July 2007.
Since peak summer season demand is nearly finished, the probable closure is not expected to impact TEPCO's capacity to provide power to its customers, reported Reuters.
A spokesman for TEPCO said that a final decision on the matter would be taken in one week.