atw Vol. 63 (2018) | Issue 5 ı May
Operating sequence in 2017
Electrical output in %
January February March April May June July August September October November December
In the year 2017 nuclear power plant Brokdorf (KBR) was with an
availability factor of 48.23 % in total 4,527.21 operating hours on the
Due to an increased oxide layer thickness on the fuel element
cladding tubes (ME 2017/02) occurred an unplanned revision
extension of 156 days. The revision was completed on 30 July 2017
after 177 revision-days. Due to the determination of ME 02/2017
“ increased oxide layer thickness on the cladding tubes of fuel
elements” the thermal reactor power was first limited to a maximum
88 % until 14 September 2017. Afterwards the thermal reactor power
was limited in the framework of the modified operating conditions
for the 30 th operation cycle, with a coolant temperature lowered
100 by 3 K, to maximum 95 %.
On 9 December 2017 a failure occurred on one of the primary
coolant 80 pumps. The plant stabilised itself with a 3-pump operation at
a reactor capacity of 40 % and a generator power of approx. 570 MW.
The 60 cause of the failure was a malfunction of the under-voltage
release inside the circuit breaker. The under-voltage release was
Unplanned shutdowns and reactor/turbine trip
Power reductions above 10 % and longer than for 24 h
See operating diagram:
• Operation with lowered reactor power of max.. 88 % due to an
oxid layer problem at the fuel element cladding tubes
• Runback for a grid-supporting power control
Delivery of fuel elements
During the reporting year no fuel elements transportations were
Waste management status
By the end of the year 2017 30 loaded CASTOR © cask were located at
the on-site intermediate storage Brokdorf.
After reaching the natural cycle end on 31 December 2016 a 35-day
stretch-out operation directly adjoined. On 4 February 2017 the
plant was shutdown for the 29 th refuelling and plant revision:
The revision included the following priorities:
• Reactor Offload of the RPV.
Positionierung: Inspection of FE, SE, SC.
Clarification of cause ME2017/02.
Bezug, links, unten
Exchange of the BAT-cable.
Load of 72 fresh fuel elements.
• Main VGB: coolant HKS6K pump YD20 30 Ring % exchange of e-motor.
atw: 100 60
of the axial bearing.
• Recuperation heat exchangers Pressure testing.
• HP-Cooler TA11/12 B001 Pressure testing.
• Coolant Works on pump stationary head VE10/20.
• Turbine Standard service, Bearing inspection SB14.
• Transformers Exchange CS22/CT41.
X = 20,475 Y = 95,25 B = 173,5 H = 38,2
Operating results 2017 – Part I*