atw Vol. 63 (2018) | Issue 5 ı May
348
Isar 2
REPORT
Operating sequence in 2017
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
On 22 January 1988 unit 2 of Isar nuclear power plant (KKI 2) fed for
the first time electricity into the grid. 30 years later KK2 convinces
80
with position number 1 of the German generation statistic among
nuclear power plants. With more than 11.5 b kilowatt hours of
60
generated power in the year 2017, KK2 leads the German ranking
despite of frequently providing system services (in the year 2017 this
40
corresponded to the supply of standard performance of 7.8 full-load
days of non-produced power), 13 days of stretch-out operation
20
( before downtime), the additional short shutdown and the annual
revision.
100
0
Planned shutdowns
100 14 to25 January: Short shutdown with refuelling.
Power plant KKI 2 remained shortly shutdown from 14 until
25 80 January for refuelling and the intended pre-commissioning-works
with duration of nearly 12 days. 36 fuel elements were inserted.
860July to 20 July: Refuelling with annual revision.
Refuelling took place from 8 until 25 July with duration of 17.6 days.
The
40
revision was completed 8 hours before its actually scheduled
date. During the revision 44 new fuel elements were inserted.
20
Unplanned shutdowns and reactor/turbine trip
0
After the grid synchronisation on 25 July at 14:41 h started
the scheduled performance increase with the given gradients.
During the power consumption up to 450 MWel generator power
the turbine automated test system „protection systems“ was
examined. Positionierung:
Approximately 45 seconds after starting the subgroup
control for the turbine „protection systems„ a reactor scram and
Bezug, links, unten
turbine scram were released on 25 July at 15:56 h. The cause was a
valve malposition inside the hydraulic system of the turbine
(see ME VGB: 01/2017). HKS6K The generator 30 % was synchronised again with the
grid on 26 July at 23:29 h.
X = 20,475 Y = 95,25 B = 173,5 H = 38,2
atw: 100 60 0 0
Power reductions above 10 % and longer than for 24 h
None.
National Peer Review
25 to 27 October: National Peer Review “Risk assessment”.
WANO Review/Technical Support Mission
31 July to 3 August: WANO pre-visit.
Delivery of fuel elements
In the reporting year 28 uranium fuel elements from Westinghouse
were delivered. 32 uranium fuel elements are in stock at the dry
storage.
Waste management status
Currently 35 CASTOR® V-casks (13 units CASTOR® V/19 (85-typ),
13 units of CASTOR® V/19 (96-type), 9 units of CASTOR® V/52
(85-type)) and 7 TN®24E-casks are stored in the on-site intermediate
storage.
During the period from 18 September 2017 until 1 December
2017 6 TN®24E-casks were successfully loaded at the KKI 2. With this
loading campaign no further fuel element transportations are further
necessary until EoL (31 December 2022).
Technical optimisation of the KKI BELLA: The commissioning of
the unit safety relevant trades took place during the calendar weeks
49 until 51. The functional testing and acceptance testing (FAP) were
successfully completed in the presence of the supervising expert in
calendar week 51.
General points
Performance changes of ±100 MW from approx. 1,270 MWe1 for the
prequalification of the frequency arrangement were carried out on
22 March 2017 between 14:00 h and 16:53 h.
Form 8 August 2017 until 10. August 2017 four laden journeys
were carried out for the examination and commissioning of the
retrofitted predictor in the adaptive power distribution regulation
(ALV) for an automatically adjustment of the D-bank characteristic
curve impact. Thereby the minimum performance of approximately
560 MW MWel equivalent to a reactor performance of approx. 46 %
was achieved. For the upgrade (exchange of modules)) of the PRINS
processor (process computer) lowering phases in each case of
2 x 35 MW were run due to the limited availability of the calculation
value “Thermal Reactor Power” in calendar weeks 38, 39 40 and 41.
Report
Operating results 2017 – Part I*
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