Un trio de apóstatas entre los antepasados

C1 Operation, 9 March 2011

The focus areas of inspecting the operation were the planning and assessment of the operating unit’s operations as well as the maintenance and review procedures regarding operation-related doc- uments. Following the observations made during the inspection, STUK required the Loviisa power plant to assess the up-to-dateness of documenta- tion in the main control room and to delete or update any outdated documents. It was also found that there was scope for improvement in the sign- ing off practices of training information sheets in- cluded in the control room documentation.

C1 Operation, 10 August and 21 September 2011

The inspection of operation consisted of oversight and inspections by STUK in connection with the annual maintenance outages of Loviisa plant units in September and October, focussing on the activi- ties of the power plant’s operating and maintenance organisations and its quality assurance unit. The oversight included assessment of the maintenance of operating procedures, work permit practices, shutdown and start-up of the plant units, imple- mentation of modifications, general tidiness and housekeeping as well as testing activities. Following the observations made in the course of oversight and inspections, STUK required the Loviisa pow- er plant to develop further the flow of information between Fingrid, the company responsible for the monitoring and maintenance of the national grid, and the Loviisa power plant, as well as the pro- cessing of information provided by Fingrid in the different organisational units of the power plant. It was further noted that the power plant must complete the procedures for kick-off meetings and implement the related induction training. STUK also imposed the requirement of further developing the assessment and follow-up procedures regarding the success of corrective actions taken on the basis of internal follow-up inspections.

C2 Plant maintenance, 17 August 2011

In the inspection it conducted in August STUK as- sessed ageing management at the Loviisa power plant as well as its development following the ex- tensions to the plant’s operating life and the organ- isational changes carried out. Particular attention was paid to the control measures that the respon- sible units use to identify the actions required by the ageing of components, such as basic overhauls or improvements to the maintenance, inspection and testing programmes. The chosen practical ex- amples of mechanical or electrical engineering and I&C components were the internal parts of the reactor pressure vessel, the spare parts for and repair capabilities of relays and plant protection system PC cards, as well the spare parts for the main steam line radiation measurement. In ageing management based on the plant’s procedures, the extent of actions is decided at the Loviisa plant on the basis of the operating life and availability of components, systems and structures. In the future, it must be verified whether the plant is also in control of physical and technological ageing in such parts of the plant required for important safety functions which, according to the procedures, are not included within the scope of the ageing man- agement programme. Furthermore, the Loviisa power plant must assess whether the system re- sponsibilities regarding ageing management have been defined in such a manner that the parts of the plant important for safety are covered and that sufficient human resources have been allocated to system responsibility duties.

C3 Electrical and I&C systems, 1–2 November 2011

The electrical subjects inspected in the inspection of electrical and I&C systems were electrical de- sign, acceptance inspections, oil leaks in the main circulation pump motors, vibration measurements on EDGs, relay protection and the monitoring of electrical equipment ageing. Following the inspec- tions, STUK required Fortum to supplement and further specify the maintenance procedures for the inspected subjects. Furthermore, STUK required Fortum to submit an account of the oil leaks oc- curring in the main circulation pump motors and the related corrective actions. The I&C subjects included component repair procedures, manage- ment of ageing and qualifications, organisation and STUK-B 147 PeriodicinsPectionProgrammein 2011 APPENDIX 5

competence of the maintenance personnel deal- ing with new programmable technology, as well as the organisation, competence and design pro- cess development of the plant’s I&C design activi- ties. Following the inspection, STUK required the power company to draw up inspection and testing plans for component repairs, to describe the pro- cedures in the competence development process of the plant’s I&C design and installation personnel and to submit to STUK the interim results of com- petence development and rectify the deficiencies in the I&C design process.

C4 Mechanical engineering, 15 November 2011

The subjects of mechanical engineering inspection were primary circuit load measurements, pressure and temperature transients as well as the ageing management of pressure-bearing components. The Loviisa power plant has not recorded the inter- rupted heat-ups of the primary circuit from cold shutdown state to operating state as primary cir- cuit loading situations. STUK required the power company to assess if the interrupted heat-ups can have caused significant additional strains on the primary circuit. When assessing the replacement of pressurizer spraying lines at the Loviisa power plant, STUK paid attention to the possibility of strains induced by fluctuations in the flow condi- tions. STUK required the power company to sub- mit an account of the strain measurements to be carried out in conjunction with replacing the pipe- lines. Measurements of loads inducing fatigue to pipe material have been carried out at the Loviisa power plant in the system designed for blowing out secondary circuit impurities accumulating in the steam generator. STUK required the power com- pany to verify further these observations by non- destructive tests on the subject pipeline sections. Furthermore, STUK required the power company to produce an account of the current level and ac- ceptability of the auxiliary feed water system pipe- line vibrations observed at the Loviisa power plant after the latest power uprates.

C5 Structures and buildings, 27 October 2011

In the inspection of structures and buildings at the Loviisa power plant, the maintenance procedures of structures, buildings as well as seawater chan- nels and tunnels were assessed. In addition, the

results of inspections carried out by the power com- pany and the modifications made were discussed. The scope of inspections included the organisation of the power company, inspection procedures is- sued by the power company, in-service inspections by the power company, maintenance, repairs and modifications of seawater tunnels and channels, supplementary construction works at the plant area, operational experience feedback activities and other inspections within the sphere of respon- sibility. No requirements were imposed following the inspections.

C6 Information management and security, 1–2 February 2011

The focal areas selected for the inspection of in- formation security practices at the Loviisa power plant were the procedures issued for information security-related activities and maintenance of these procedures, as well as analysis of informa- tion security-related operational experience and taking it into account when developing operations. During the inspection, STUK found scope for im- provement in certain areas.

C7 Chemistry, 22–23 February 2011

The subjects of the inspections on chemistry were the chemical conditions of the primary and second- ary circuits compared to guide values, reporting of chemical and radiochemical results to STUK, spare parts management and functionality of the modi- fication process as well as certain areas of qual- ity management. The reporting of chemical and radiochemical deviations to STUK has been made less ambiguous, although there is still scope for improvement. In radiochemistry, the uncertainty regarding activity measurements has only been based on statistical uncertainty, which is why the requirement of producing a budget of overall un- certainty was imposed during the inspection. The requirement was imposed so that the procedures would have to be supplemented with descriptions of certain current practices and that the decontam- ination instructions would have to be completed before the 2011 annual maintenance. The plant has established a working group to find a solution to the procurement of spare parts for the continu- ous chemical process measurements. Some contin- uous measurements have been inoperable or have malfunctioned due to the lack of spare parts, and STUK-B 147

measurements have had to be replaced with labo- ratory measurements. Following the inspection, it was required that the examinations in progress are completed without delay and that the responsi- bilities and necessary procedures for ensuring the availability of spare parts are defined.