http://www3.nhk.or.jp/news/genpatsu-fukushima/20120310/index.html The NHK checked the progress of the reinforcement measures listed by the NISA in February, by asking each nuclear plant operator about the 12 points considered "important points", among a list of 30. All plant operators have installed redundant power supplies, including air-cooled generators and power generating trucks. The installations of watertight building doors are completed or under work. The dispersion of the main power distribution panels, meant to lower the risk of a blackout, is difficult to undertake immediately, as finding a suitable location and construction work take time. The installation of batteries able to supply power to instrumentation for a long time is "under study" at all nuclear power plants. Pr. Kazuhiko Kudo of Kyushu university says the government must say clearly which items must be completed before the restart of the plants and which items are allowed to be done later.
The 30 points are probably those mentioned in http://www.meti.go.jp/press/2011/02/20120216004/20120216004.html "Technical knowledge on the Tokyo Electric Fukushima Daiichi NPP accident (interim compilation)" (16 February 2012) as "Matters being considered which should be reflected in future regulations".
[Countermeasures for external power]
1 Improvement of reliability of external power lines
2 Improvement of earthquake resistance of transformer equipments
3 Improvement of earthquake resistance of switching stations
4 Quick recovery of external power equipments
[Countermeasures for internal electric power equipments]
5 Dispersion of internal electric equipments into different locations
6 Reinforcement of inundation countermeasures
7 Reinforcement of redundancy and diversification of emergency AC power supplies
8 Reinforcement of emergency DC power supplies
9 Installation of separate power supplies for exclusive use
10 Simplification of electric supply from outside
11 Storage of spare items in relation with electric equipments
[Countermeasures for cooling and water injection]
12 Improvement of judgement capacity during an accident
13 Securing inundation resistance and dispersion into different locations of cooling equipments
14 Reinforcement of final heat sink after an accident
15 Improvement of operational reliability of isolation valves and safety relief valves
16 Reinforcement of alternative water injection function
17 Improvement of reliability of cooling and water supplying function of spent fuel pools
[Countermeasures for primary containtment vessel]
18 Diversification of PCV heat removal function
19 Countermeasures to prevent PCV top head flange damage by excess of heat
20 Secured transition to low pressure alternative water injection
21 Improvement of venting reliability and operability
22 Reduction of the environmental impact of venting
23 Secure independance of venting pipes
24 Prevention of hydrogen explosions (concentration management and appropriate release)
[Countermeasures for management and measurement equipments]
25 Equip and secure the command post used during accidents
26 Secure the communication function
27 Secure the reliability of instrumentation during accidents
28 Reinforcement of plant status surveillance function
29 Reinforcement of monitoring function during accidents
30 Building of emergency response system and performance of drills
Underlined items are for boiling water reactors only.