for Japanese


3 April, 2015

Pre-Service Inspection Starts at Sendai-1 before Restart

On March 30, Nuclear Regulation Authority (NRA) began its pre-service inspection of the Sendai-1 Nuclear Power Plant (PWR, 890MWe), in Kagoshima Prefecture, owned and operated by the Kyushu Electric Power Co.

Sendai NPPs

A pre-service inspection of equipment and facilities is necessary prior to restarting the reactor. This is the first such inspection to be fully implemented under the new regulatory standards issued after the accident at the Fukushima Daiichi Nuclear Power Station in March 2011. They require a range of careful inspections of new equipment intended as countermeasures to severe accidents.

Units 1 and 2 of the Sendai NPS were the first NPPs recognized by the NRA last year as conforming to the new regulatory standards. At Unit 1, many new items of equipment have been installed as safety measures.

For the units to be restarted, pre-service inspections must be conducted to confirm that the installation of equipment was proper and that performance will be as intended. On the first day of the inspection, March 30, five NRA inspectors interviewed staff members at Unit 1 about the methods used in their work.

Pre-service inspections are being carried out both of newly-installed equipment at NPPs, and of modifications to and renovations of existing equipment. At Unit 1, various pieces of equipment were newly installed to meet the requirements of the new regulatory standards,

There are about 1,200 inspection items, primarily related to severe accidents. They include the following:

  • Additional pumps to inject water into reactors and containment vessels
  • Systems where generated hydrogen and oxygen are combined into water to prevent hydrogen explosions
  • Piping to feed cooling water to spent fuel pools

Inspections will be made to confirm that the devices and systems have the intended design capabilities. Without the inspections, the NPP cannot be restarted. The inspections, in addition to checking dimensions and the state of installation, will carry out test operations, such as seeing if a pump can pump water at the necessary pressure.

At the final stage of the inspection, the reactor will be started up, and output will be increased, with a comprehensive performance check of the entire system to be made, including new equipment. If no problems are found, a certificate will be issued.

Kyushu Electric Power has released the following schedule for the inspection process:

  • In early June, during the pre-service inspection, nuclear fuel assemblies will be loaded into the reactor of Unit 1.
  • In early July, control rods will be removed to start up the reactor.
  • After a week or so, Unit 1 will begin generating electricity.
  • At the end of August, commercial operations will resume.

The inspection may be prolonged, however, because it has to be implemented thoroughly and with certainty.


This site uses Akismet to reduce spam. Learn how your comment data is processed.

SNS facebooktwitter

NPPs Map


Grossi on Fukushima: Marking a Decade Since the Accident

10 March, 2021
Grossi on Fukushima: Marking a Decade Since the Accident04:11

Recent News

15 October, 2021
LDP Adds SMR Development and Nuclear Fusion to NPP Restarts in Its Policy Manifesto
7 October, 2021
Kishida Administration Inaugurated, with New METI Minister Hagiuda Holding Press Conference on Taking Office
6 October, 2021
IAEA Holds 65th General Conference in Vienna, with Japanese Minister of State for Science and Technology Delivering Statement in the General Debate
30 September, 2021
JAEC Releases 2020 White Paper on Nuclear Energy
17 September, 2021
NRA Permits Shimane-2 under New Regulatory Standards
14 September, 2021
IAEA Deputy Director General Evrard Visits Japan in Advance of Safety Review of ALPS-treated Water
1 September, 2021
Evaluation Report Issued by IAEA’s Review Mission to Fukushima Daiichi: First Visit since 2018
24 August, 2021
METI and IAEA Agree on Further Review Missions to Fukushima Daiichi
4 August, 2021
JAEA Restarts High-Temperature Engineering Test Reactor “HTTR”
2 August, 2021
Information about Fukushima Daiichi NPS Water Treatment
28 July, 2021
METI’s Committee Shows Rough Draft of Next Strategic Energy Plan
2 July, 2021
Mihama-3 Restarted After Decade-long Hiatus: First Restart in Japan of a Reactor Operating Beyond 40 Years
28 June, 2021
Mihama-3 Restarts after Decade-long Hiatus
25 June, 2021
New Canada-Japan Partnership Supports Greater Collaboration to Meet Climate Change Objectives and Net-zero Goals
24 June, 2021
METI Issues New Green Growth Strategy Through Achieving Carbon Neutrality
16 June, 2021
ANRE Sticks to “S+3E”
16 June, 2021
Japanese Cabinet Approves Environmental White Paper 2021
16 June, 2021
LDP Parliamentary Association to Reconfirm Position on Utilization of Nuclear Power
16 June, 2021
Fukui Governor Concerned about Deletion of Reference to “Maximum Utilization” of Nuclear Power
14 June, 2021
Working Group on Offshore Release of Treated Water Meets in Miyagi