Japan Times, April 23.
No-go zone tresspassers face fines, arrest.
The 20-km evacuation area was declared a no-go zone, violators would be subject to fines or detention. [BBC reported some 60 people were still living within the zone and evacuated, while others had been entering to retrieve personal effects and pets. Pets are left as strays.   Fines are as much as 100,000 yen (ca. $1100) and detention up to 30 days.
One person per household will be allowed in the 3km-20km area by bus for a period of 2 hours to collect personal effects, and would be screened for radioactivity.
When and whether some residents would be allowed to return at a later time is open to question.
Under the best-case scenario, Tepco says cold shhutdown will take at least 6 months.