Summary Report for Conduct of Kozloduy NPP Stress Tests

“Kozloduy NPP” PLC
SUMMARY REPORT
for Conduct of Kozloduy NPP
Stress Tests
6.1.1.5 Procedures, training and exercises
Actions of the personnel at design and beyond design basis accidents are defined in
instructions for actions of the personnel in case of accident. Envisioned in instructions actions of the
personnel result in bringing of the nuclear installations into safe condition.
Actions of the personnel on diagnostics of condition of Units 5 and 6, on restoration of or
replenishment for failed safety functions and on prevention or localization of consequences of core
damage are defined in symptom-based emergency instructions (SBEOP). SBEOP were developed
on the bases of protection of fundamental safety functions with approach similar to the
Westinghouse one, as step-by-step procedures with description of main and alternative operator
actions in two-column format. SBEOP are controlled and maintained adequate to existing powers
through strict on-site rules on verification and validation which envision multiple checks before
these are introduced into operation. Analytic validation is conducted on the original technique
provided by Department of Energy (DOE USA). The validation covers all design modes and wide
range of accidents, included in and required by [4].
For Units 5 and 6 3 sets are envisioned of SBEOP as follows:
· SBEOP for power operations;
· SBEOP for shut down reactor with pressurized primary circuit;
· SBEOP for shut down reactor with depressurized primary circuit.
SBEOP structure contains:
· procedures on diagnostics of condition;
· procedures on optimal recovery;
· procedures on recovery of CSFs (critical safety functions);
· procedures of ADP type (Accidents with destruction of protection).
Actions on SBEOP are alerted after actuation of the emergency protection and/or
involvement of the safety systems. The structure and scope of SBEOP cover all design accidents
and wide range of beyond design basis accidents.
Set of SBEOP on power operations is introduced into operation and distributed to operator
workplaces.
SBEOP for shut down reactor with pressurized primary circuit passed processes of
verification and validation. Up to present operator training is conducted for work with instructions
of this type, and after this they will be introduced into operation.
SBEOPs set for shut down reactor with depressurized primary circuit – will be subject to
internal procedures of verification and validation at the NPP.
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