atw 2018-04v6


atw Vol. 63 (2018) | Issue 4 ı April



The plant should take measures

to reinforce and implement standards

to enhance the performance of reactivity

manipulations in a deli berate

and carefully-controlled manner.

The plant should improve the

support, training and documented

guidance for Severe Accident Management

Guideline users in order to

mitigate complex severe accident


The team provided a draft report of

the mission to the plant’s management.

The plant management and the

Nuclear Safety Council (CSN), which

is responsible for nuclear safety

oversight in Spain, will have the

opportunity to make factual comments

on the draft. These will be

reviewed by the IAEA and the final report

will be submitted to the

Government of Spain within three


The plant management said it

would address the areas identified

for enhancement and requested a

follow-up OSART mission in about

18 months.)

| | (18791443),

Tianwan-3 Passes Commissioning

Tests at 100% Power

(nucnet) The Tianwan-3 nuclear

reactor unit in Jiangsu province,

northeastern China, has successfully

operated for 100 hours at 100% of its

design power level without interruption,

Russian state nuclear corporation

Rosatom said.

Rosatom said the 990-MW VVER

V-428M unit, which started to deliver

electrical energy to the grid on

30 December 2017, has undergone a

series of tests during the 100-hour

operation period required by regulators

before giving green light for

commercial operation.

Construction of Tianwan-3 began

in December 2012. The Tianwan

| | Swiss regulator approves safety case for restart of Beznau-1 (Photo: Axpo).

nuclear station is the largest economic

cooperation project between Russia

and China, an earlier statement had


Tianwan-1 and -2, also VVER

V-428M units, began commercial

operation in 2007. The Tianwan-4

VVER V-428M unit is also under construction

by Russia while Tianwan-5

and -6 will be indigenous Generation

II+ CNP-1000 units.

| |

Swiss Regulator Approves

Safety Case for Restart of


(nucnet) Switzerland’s Federal

Nuclear Safety Inspectorate, ENSI,

has given the go-ahead for the restart

of the Beznau-1 nuclear unit after

approving the safety case presented

by owner Axpo following the discovery

in 2015 of flaw indications in

the reactor pressure vessel (RPV).

ENSI said in a statement that

Axpo had carried out “extensive

investigations and analyses” to

demonstrate that the RPV is safe.

Materials testing has shown

that agglomerates in the RPV do not

affect its key properties and structural

integrity analysis has shown that

the RPV does not contain any flaws

that could lead to its failure. “IRSN

is satisfied that work has been done

to all appropriate national and international

standards,” the statement


Axpo said the safety case for

Beznau-1, the world’s oldest commercial

nuclear plant still in operation,

corroborates earlier assessments

and investigations, and validates the

existing safety margin for the safe

operation of the plant for 60 years.

Operator KKB will now begin the

return to service process with the

plant expected to be operating at full

load by the end of March 2018.

In December 2015 Axpo submitted

a roadmap ENSI detailing plans for

further investigations of flaw indications

in the RPV. During a scheduled

outage that began in May 2015,

inspections of the RPV registered

findings at some points in the base

material of the RPV indicating

“ minimal irregularities in the fabrication

process”, Axpo said. The company

carried out further measurements

and analyses and submitted a

report to ENSI.

In July 2015, Axpo announced

that the restart of Beznau-1 had been

postponed while the flaw indications

were investigated further. Then in

August, ENSI called for additional


Beznau-2 was not affected by the

flaw indications and was returned to

service after its scheduled outage in


| |

Kursk II Passed

Construction Milestone

(rosatom) Kursk II began reinforcing

the foundation slab for the reactor

building of Unit 1. This operation

became the year’s key event on the

construction site of the Kursk plant.

On 21 December 2017, the first

16-ton reinforced concrete block was

installed on the rebar of the lower

foundation belt. According to the

project design, the foundation comprises

105 reinforced concrete blocks

with a total weight of 1,600 tons. This

will enable the construction team

to start concreting the foundation

slab of the reactor building in the

first half of 2018.

Prior to putting the first concrete

block, a rebar coupler engraved with

the words “The future is shaped today.

The first coupling sleeve of the innovative

VVER-TOI power unit” was

ceremonially installed into the foundation


VVER-TOI (which means ‘a standard

optimized and automated power

unit based on VVER technology’)

reactors meet Russian and global

safety requirements and have a longer

service life and higher installed

capacity than existing reactors of

the Kursk Nuclear Power Plant.

Alexander Mikhailov, Governor of

the Kursk Region, noted that it was

an honor for the region to build

and commission one of the world’s

first nuclear plants with advanced

VVER-TOI reactors. “Construction of

Kursk II designed to meet the latest

global standards offers our region

development prospects for the entire


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