On June 3rd, 2011, we have received an instruction document*1 from Nuclear 
and Industrial Safety
Agency (NISA) of Ministry of Economy, Trade and Industry, in relation to a 
fact that some damage has been found in cylinder liners of emergency 
diesel generators of "Monju", a fast-breeder reactor, of Japan Atomic 
Energy Agency (independent administrative institution). They instruct us 
to make a roadmap as to checking the soundness of cylinder liners for 
which no procedural manual for exchanging are prepared or which we have 
not exchanged in a appropriate manner in order to prevent the cylinder 
liners from being damaged with regard to Unit 2 and Unit 4 in Fukushima 
Daini Nuclear Power Station, in which the emergency diesel generators of 
the same configuration as the ones of "Monju" are used.
We have also received an instruction document*2 that instructs us to make 
and implement steadily a roadmap as to check the soundness and to exchange 
the cylinder liners that some lead might have been mixed in like "Monju" 
and are used in emergency diesel generators of Unit 2 in Fukushima Daiichi 
Nuclear Power Station. 

We will implement the instruction and inform NISA of the results.

*1 Instruction document

"Check considering the damage found in cylinder liners of emergency diesel 
generators of "Monju", a fast-breeder reactor, of Japan Atomic Energy 
Agency (independent administrative institution) (instruction)

On June 3rd, 2011, Nuclear and Industrial Safety Agency (NISA) received a 
report from Japan Atomic Energy Agency (independent administrative 
institution) on causes and countermeasures with regard to the damage found 
in cylinder liners of emergency diesel generators of "Monju", a fast-
breeder reactor.
In the report, they assume that cylinder liners were damaged because, when 
they were dismantled and reassembled, workers used only hydraulic jacks 
with no hydraulic oil gauge and pressured too much.
In Unit 2 and Unit 4 of Fukushima Daini Nuclear Power Station, emergency 
diesel generators of the same configuration as the ones of Monju are used, 
and, as procedures of dismantling and reassembling the cylinder liners are 
not clear, in order to prevent the cylinder liners from being damaged, we 
hereby instruct you to report the results of the following 5 items. The 
due dates of each report are: No.1 and No.2---by July 4th, No.3---soon 
right after implementation, No.4---soon after implementation together with 
No.3, and No.5---soon after implementation.

1.Checking and formulating procedures with regard to dismantling and 
  reassembling cylinder liners as well as appropriate conservation manner 
  of hydraulic pressures
2.Making a roadmap with regard to checking the soundness of the cylinder 
  liners that might have been damaged due to inappropriate dismantling and 
  reassembling
3.Implementing the roadmap mentioned above in 2.
4.Making a roadmap with regard to exchanging the cylinder liners which are 
  not judged as sound in the course of the implementation of the checking 
  mentioned above in 3
5.Implementing steadily the roadmap mentioned above in 4.

*2 Instruction document 

"Check considering the damage found in cylinder liners of emergency diesel 
generators of "Monju", a fast-breeder reactor, of Japan Atomic Energy 
Agency (independent administrative institution) (instruction)

On June 3rd, 2011, Nuclear and Industrial Safety Agency (NISA) received a 
report from Japan Atomic Energy Agency (independent administrative 
institution) on causes and countermeasures with regard to the damage found 
in cylinder liners of emergency diesel generators of "Monju", a fast-
breeder reactor.
The report says that during the manufacture of cylinder liners, some lead 
was mixed in their materials and a lead structure (Widmannstaetten 
structure), which may weaken the intensity, has been formed in them. It 
also says that the cylinder liners which lead might have been mixed in 
were manufactured from February 1987 to May 1989.
As in Unit 2 of Fukushima Daiichi Nuclear Power Station emergency diesel 
generators that use cylinder liners which some lead might have been mixed 
in like ones of Monju are used, in order to prevent the cylinder liners 
from being damaged, we hereby instruct you to implement the following 
items and to report the results to us. The due dates are: No.1---by 
No.2---July 4th, No.3---soon after the implementation.

1.Checking the soundness of the cylinder which are manufactured from 
  February 1987 to May 1989 and lead might have been mixed in.
2.Making a roadmap with regard to exchanging cylinder liners which are not 
  judged as sound in the checking process in No.1
3.Implementing the roadmap steadily mentioned above in No.2.