atw - International Journal for Nuclear Power | 04.2022

atw Vol. 67 (2022) | Ausgabe 4 ı Juli
46
Grohnde
REPORT
Operating sequence in 2021
100
90
80
70
60
50
40
30
20
10
Electrical output in %
January February March April May June July August September October November December
The Grohnde nuclear power plant was off the grid for a 26.7-day
100
overhaul with refuelling in the 2021 reporting year and achieved a
time 80 availability of 92.7 %. Gross generation amounted to
11,093,345.5 MWh.
60
The 2021 revision was also carried out with an elaborate protection
concept against Corona-19 for the personnel working in the
40
KWG. The last revision ended 13 hours earlier than originally
planned 20 when the grid was switched off on 15 April 2021.
According to the specifications of the load dispatcher, 6 load
0
reductions took place in 2021 for a total of 134 hours, as well as 151
grid and 108 primary controls for a total of 4,940 hours.
100
Planned 80 shutdowns
20 March to 15 April 2021: 38 th Refuelling and major annual
60
revision:
Nuclear power plant Grohnde was shut down as scheduled.
40
The main planned works during this year’s revision were:
• 20Unloading and loading with the replacement of 28
fresh fuel elements.
• 0Full inspection of 19 fuel elements.
• Eddy current test of 28 control elements.
• Visual inspection of 15 flow restrictor assemblies.
• XA Leak rate test.
• GY40/80 Maintenance level W5
incl. visual inspection of cylinder liners.
• Main redundancy 4/8 with rail inspection, branch inspections,
capacity inspections, valve and actuator inspections, tank inspections.
• VC10/30 D001 Engine revision/engine replacement.
• Special inspection programme of 55 storage assemblies in the
reactor protection system.
• During the inspection of the fuel assemblies, 2 fuel assemblies
with slight corner damage were located. These fuel assemblies
were replaced by fuel assemblies with similar burn-up behaviour.
Unplanned shutdowns and reactor/turbine trip
None.
Power reductions above 10 % and longer than for
24 h
In the months of January, February, March, May, November
and December, load-following operation due to requirements
of the load of the load dispatcher.
Delivery of fuel elements
In January 2021 28 U-/U-Gd-fuel elements were delivered.
• Start-up inspection of the fuel element centring pins
Waste management status
of the Positionierung:
UKG and OKG.
Between September and November 2021, a total of three
• TF40 Bezug, B001 Cleaning links, the unten nuclear intercooler.
CASTOR © -V/19 containers were dispatched to the ZL-KWG.
• TF40 X D001 = 20,475 Inspection Y of = the 95,25 intercooler pump. B = 173,5 H = 38,2
• TF20/30 VGB: S013/014 HKS6K Screw 30 % replacement
General points/management systems
on the quick-acting dampers.
atw: 100 60 0 0
In September 2021, the monitoring audit of the quality
• Pressure test of the recuperative heat exchanger TA00B001,
management system (ISO 9001) and the recertification of
• Internal and pressure inspection of HP cooler TA11/12 B001
and volume compensation tank TA20 B001.
the environmental management system (ISO 14001) and
• TH40/48 D001 Inspection of aftercooling and pool pump, the occupational health and safety management system
• Internal and pressure test of the feed water
(OHSAS 18001) were successfully carried out.
HP preheating section.
Report
Operating results 2021