Summary Report for Conduct of Kozloduy NPP Stress Tests
Summary Report for Conduct of Kozloduy NPP Stress Tests
Summary Report for Conduct of Kozloduy NPP Stress Tests
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“<strong>Kozloduy</strong> <strong>NPP</strong>” PLC<br />
SUMMARY REPORT<br />
<strong>for</strong> <strong>Conduct</strong> <strong>of</strong> <strong>Kozloduy</strong> <strong>NPP</strong><br />
<strong>Stress</strong> <strong>Tests</strong><br />
The operating makeup is ensured from 4 electric pumps <strong>for</strong> service water supply and in case<br />
<strong>of</strong> loss <strong>of</strong> <strong>of</strong>f-site power from 4 diesel pumps. These are located in Circulation pump station 3 and<br />
4, while each station has per 2 electric and 2 diesel pumps.<br />
The emergency makeup <strong>of</strong> the spray pools is provided from 6 artesian wells in Danube<br />
River lowland.<br />
At loss <strong>of</strong> all options <strong>for</strong> spray pools makeup with water the reactor fuel cooling can be<br />
ensured by using alternative system <strong>for</strong> the steam generators makeup, and the spent fuel pools fuel –<br />
by the system <strong>for</strong> their filling.<br />
Protective measures <strong>for</strong> maintaining <strong>of</strong> emergency power supply<br />
The AC emergency power supply sources <strong>for</strong> Units 5 and 6 are emergency dieselgenerators,<br />
additional diesel-generators and mobile diesel-generator.<br />
As the additional diesel-generators are located above elevation 0,00 at the site and the<br />
normal operation sections powered from them are located at elevation 3.60, they are not potentially<br />
threatened due to MWL.<br />
Units 5 and 6 safety systems equipment power supply is provided from emergency dieselgenerators<br />
(3 per each unit). The sections powered from them are located at elevation 20,40, they<br />
are not potentially threatened due to MWL.<br />
Potential threat from flooding exists <strong>for</strong> cable channels between DGS and reactor<br />
compartment located at elevation 31 m.<br />
The plant diesel-generators equipment layout suggests that at potential flooding <strong>of</strong> the rooms<br />
in diesel-generator stations the main auxiliary facilities will be affected, such as transferring fuel<br />
pumps <strong>of</strong> the diesel-generators. In this situation the diesel-generator can operate till the fuel<br />
depletion in gravitation tank (<strong>for</strong> about 7 hours at full power), and during this time options to fill<br />
this inventory with tank trucks shall be found. Obviously, the water entering the diesel generator<br />
station premises does not involve direct and immediate failure <strong>of</strong> emergency diesel generators.<br />
In accordance with [45], the fuel and oil inventories <strong>for</strong> continuous mode <strong>of</strong> operation <strong>of</strong> the<br />
emergency power supply sources <strong>of</strong> the ІІ category ensure:<br />
· Emergency diesel-generators: in accordance with 4.3.1.1. <strong>of</strong> [45], the operational<br />
(inviolable) fuel inventory in diesel-generator stations-5,6 is totally 672 m3 (112 m 3 per<br />
each diesel-generator), that according to item 4.3.1.2 <strong>of</strong> [45] ensure continuous operation <strong>of</strong><br />
each <strong>of</strong> the diesel-generators <strong>for</strong> 3 days;<br />
· Additional diesel-generator: 70 hours’ operation ensured;<br />
· Diesel pumps in circulation pump station - 3,4: 24 hours’ operation <strong>of</strong> all pumps (8<br />
per 2 fire and two <strong>for</strong> service water supply) simultaneously;<br />
· Diesel-generator “Emergency preparedness”: 8 hours’ continuous operation at<br />
nominal load without charging.<br />
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