Abstracts ASN Report 2019

temperature conditions more extreme than those initially included in the design. In parallel with development of these “extreme ĻĸĴŇѣ ĵĴņĸĿļŁĸ ņĴĹĸŇŌ ŅĸńňļŅĸŀĸŁŇņё ļŁļŇļĴŇĸķ ŇĻĸ ķĸŃĿłŌŀĸŁŇ of a number of priority modifications (such as the increase in the capacity of certain heat exchangers) and implemented operating practices optimising the cooling capacity of the equipment and improving the resistance of equipment susceptible to high temperatures. łŅ ŇĻĸ ŃĸŅļłķļĶ ņĴĹĸŇŌ ŅĸʼnļĸŊ łĹ ļŇņ ŅĸĴĶŇłŅņё ĻĴņ ļŁļŇļĴŇĸķ a modifications programme on its facilities designed to provide protection against heat wave situations. The capacity of certain cooling systems for equipment required for the nuclear safety case will in particular be improved. ĻĴņ ĴĿņł ļŁļŇļĴŇĸķ Ĵ ĶĿļŀĴŇļĶ ŀłŁļŇłŅļŁĺ ŃŅłĺŅĴŀŀĸ to anticipate climate changes which could compromise the temperature hypotheses adopted in its baseline requirements. Ĵņľĸķ Ňł ŇĴľĸ ĴĶĶłňŁŇ łĹ ŇĻĸ łŃĸŅĴŇļŁĺ ĸŋŃĸŅļĸŁĶĸ ĹĸĸķĵĴĶľ ĹŅłŀ ŇĻĸ ĻĸĴŇŊĴʼnĸņ łĹ ӅӃӄӈё ӅӃӄӉׇĴŁķ ӅӃӄӌё ĴŁķ ŇĻĸļŅ effects on the facilities. • …Ɏǝƺȸ ǝƏɿƏȸƳɀ Ļĸ ņĴĹĸŇŌ ĶĴņĸ ĹłŅ ŇĻĸ ņ ĴĿņł ŇĴľĸņ ĴĶĶłňŁŇ łĹ łŇĻĸŅ ĻĴōĴŅķņ ņňĶĻ Ĵņ ĻļĺĻ ŊļŁķņё ņŁłŊё ŇłŅŁĴķłņё ĿļĺĻŇŁļŁĺё ĶłĿķ ĴļŅ ŇĸŀŃĸŅĴŇňŅĸņё ŀĴŁіŀĴķĸ ĻĴōĴŅķņ ҎŇŅĴŁņŃłŅŇ łĹ ķĴŁĺĸŅłňņ ĺłłķņё ļŁķňņŇŅļĴĿ ĹĴĶļĿļŇļĸņё ĴļŅŃĿĴŁĸ ĶŅĴņĻĸņё ĸŇĶєҏё ĴŁķ ĻĴōĴŅķņ ĴĹĹĸĶŇļŁĺ the heatsink. א ِ ג ِ ה 0ɮƏǼɖƏɎǣȒȇ Ȓǔ Ɏǝƺ ȸǣɀǸ ȵȸƺɮƺȇɎǣȒȇ ȅƺƏɀɖȸƺɀ ȸƺǼƏɎǣȇǕ ɎȒ ǝƏɿƏȸƳɀ Ļĸ ňľňņĻļŀĴ ĴļļĶĻļ ĴĶĶļķĸŁŇ Ŀĸķ Ňł ŅĸļŁĹłŅĶĸ ļŇņ organisation for the management of risks relating to extreme ĻĴōĴŅķņє łŅĸ ņŃĸĶļĹļĶĴĿĿŌё ŁĸŇŊłŅľņ łĹ ĶłłŅķļŁĴŇłŅņ ŊĸŅĸ ņĸŇ up in all the NPPs to oversee the implementation of the actions ķĸĹļŁĸķ Ňł ķĸĴĿ ŊļŇĻ ŇĻĸņĸ ĻĴōĴŅķņє ŁŁňĴĿ ŅĸʼnļĸŊņ ĴŅĸ ĴĿņł ĻĸĿķ to improve this organisation. • Iǣȸƺ ȸǣɀǸɀ ASN observes that management of the fire risk needs to be improved, even if the number of outbreaks of fire recorded in ӅӃӄӌׇŊĴņ ĵĸĿłŊ ŇĻĴŇ ļŁ ӅӃӄӋє The findings made in previous years are still relevant with regard to some of the sites inspected: ҄ management of premises sectorisation anomalies not always appropriate for preventing the spread of a fire; ҄ deviations linked to the management of fire detection inhibitions; ҄ deviations in the management of stores of equipment represent- ing significant heat potential, in particular during reactor outage phases; ҄ deviations in the use of fire permits and sometimes inap- propriate management of the compensatory measures defined in the fire risk assessments; ҄ weaknesses in the maintenance of the fixed sprinkler equipment; ҄ problems with the accessibility of fire-fighting equipment; ҄ weaknesses in the field of fire-fighting. Ł ӅӃӄӌё Ĵņ ļŁ ŃŅĸʼnļłňņ ŌĸĴŅņё ĶĴŅŅļĸķ łňŇ ļŁņŃĸĶŇļłŁņ łŁ ŇĻĸ topic of the control of fire risks in all the NPPs and asked for corrective measures to be taken to remedy the findings. ASN observes the efforts made by certain sites to carry out the corrective measures needed, with the deployment of tools and action plans, but considers that if they are to be effective, the personnel must be given greater support with assimilating them. ŇĻňņ łĵņĸŅʼnĸķ ŇĻĴŇ ļŁ ӅӃӄӌё ĻĴķ ŇĴľĸŁ ņŇĸŃņ Ňł ŅĸķňĶĸ errors in fire risk management in the premises identified as being ŃĴŅŇļĶňĿĴŅĿŌ ņňņĶĸŃŇļĵĿĸ Ňł ŇĻļņ ĻĴōĴŅķє łŅĸłʼnĸŅё ĴŇ ŇĻĸ ŅĸńňĸņŇ łĹ ё ļŁ ӅӃӄӌׇňŁķĸŅŇłłľ Ňł ŃĴŌ ŃĴŅŇļĶňĿĴŅ ĴŇŇĸŁŇļłŁ Ňł ŇĻĸ management of combustible materials brought into the reactor building, notably during the reactor outage phases. In addition, the time taken to remedy certain deviations or to take corrective actions as a result of experience feedback needs to be reduced. ļŁĴĿĿŌё Ĵņľĸķ Ňł ļŀŃŅłʼnĸ ļŇņ ĹļŅĸĹļĺĻŇļŁĺ łŅĺĴŁļņĴŇļłŁё notably by reinforcing the capacity of its response resources to deal with an established fire. • 0ɴȵǼȒɀǣȒȇ ȸǣɀǸɀ ĸņŃļŇĸ ŇĻĸ ņŇĸŃņ ŇĴľĸŁ ĵŌ ё ŀĴŁĴĺĸŀĸŁŇ łĹ ŇĻĸ ĸŋŃĿłņļłŁ risks is not yet satisfactory on all the nuclear reactors. Certain ŀĴļŁŇĸŁĴŁĶĸ ŊłŅľ ĴŁķ ļŁņŃĸĶŇļłŁņ ŅĸńňļŅĸķ ĵŌ ѡņ ļŁŇĸŅŁĴĿ ķłĶŇŅļŁĸ ĴŅĸ ŁłŇ ĴĿŊĴŌņ ĶĴŅŅļĸķ łňŇ ņĴŇļņĹĴĶŇłŅļĿŌє ňŅŇĻĸŅŀłŅĸё ASN observes that the updating of certain documents (notably the procedures for periodic tests or for checks on piping carrying ĻĴōĴŅķłňņ ĹĿňļķņҏё ŇĻĸ ļŁŇĸĺŅĴŇļłŁ łĹ łŃĸŅĴŇļŁĺ ĸŋŃĸŅļĸŁĶĸ ĹĸĸķĵĴĶľё the processing of certain deviations and the deployment of certain modifications are sometimes postponed and this is not always justified given the potential safety consequences. ŁłŇĸņ ŇĻĸ ĸĹĹłŅŇņ ŀĴķĸ ĵŌ Ňł ŅĸķňĶĸ ŇĻĸņĸ ķĸʼnļĴŇļłŁņ through the implementation of reinforced monitoring and ķĸŃĿłŌŀĸŁŇ łĹ ŇĻĸ ĴĶŇļłŁ ŃĿĴŁє ňŅŇĻĸŅŀłŅĸё ļŁ ӅӃӄӌё ŊłŅľĸķ on updating Documents Concerning the Protection against Explosions (DRPCE), required by the regulations concerning the risks involved in ATEX training. This approach needs to continue and lead to the adoption of new requirements as a result of these ķłĶňŀĸŁŇņё ŁłŇĴĵĿŌ ŊļŇĻ ŅĸĺĴŅķ Ňł ŇĻĸ ĴķĸńňĴĶŌ łĹ ŇĻĸ ōłŁļŁĺ defined in the DRPCE for the equipment situated in these areas. łŊĸʼnĸŅё ĶłŁņļķĸŅņ ŇĻĴŇ ŀňņŇ ĶłŁŇļŁňĸ Ňł ŃĴŌ ŃĴŅŇļĶňĿĴŅ attention to this point and ensure that the explosion risk prevention approach is implemented with all necessary rigour on all the sites. • XȇɎƺȸȇƏǼ ǔǼȒȒƳǣȇǕ ȸǣɀǸɀ The provisions for the prevention and control of the internal flooding risk are also regularly checked by ASN. These inspections ņĻłŊ ŇĻĴŇ ŇĻĸ ņŇĸŃņ ŇĴľĸŁ Ňł ĶłŁŇŅłĿ ŇĻļņ ŇŌŃĸ łĹ ĻĴōĴŅķ ĴŅĸ ŁłŇ up to the level expected for all the sites. ASN more specifically observes that on some sites, the network of coordinators is still ĵĸļŁĺ ņĸŇ ňŃ ĴŁķ ļņ ŁłŇ ĹňĿĿŌ łŃĸŅĴŇļłŁĴĿє Ň ļņ ĴĿņł ŅĴŅĸ ĹłŅ to carry out internal flood situation simulation exercises in order Ňł ĵňļĿķ ňŃ ŅĸĴĿ ĸŋŃĸŅļĸŁĶĸ ĹĸĸķĵĴĶľ ĴĵłňŇ ŇĻļņ ĻĴōĴŅķє ĻĴņ ļŁļŇļĴŇĸķ ĹļĸĿķ ʼnļņļŇņ Ňł ļķĸŁŇļĹŌ ŇĻĸ ŃļŃļŁĺ ŊĻļĶĻ ĶłňĿķ cause internal flooding in the electrical buildings, which are particularly vulnerable to this risk, in order to assess the need to reinforce their maintenance. In accordance with ASN’s requests, ŊļĿĿ ĸŋŇĸŁķ ŇĻĸņĸ ņňŅʼnĸŌņ Ňł ŇĻĸ łŇĻĸŅ ĵňļĿķļŁĺņє ņĸĸņ Ĵņ ŃłņļŇļʼnĸ ŇĻĸ ĹĴĶŇ ŇĻĴŇ ĻĴņ ļŁļŇļĴŇĸķ ŇĻĸ ŅĸĹňŅĵļņĻŀĸŁŇ of the circuits of certain cooling systems that are particularly susceptible to corrosion. Considerable efforts are required on most sites to improve control of the flooding risk, in particular with respect to: ҄ the maintenance of the necessary equipment (piping, floor drains, etc.); ҄ the risk assessments during maintenance operations and in the event of detection of a malfunction of a necessary equipment item; ҄ the compliance with the corrective action deadlines identified by the annual reviews; ҄ the training of the coordinators and awareness-raising among ŇĻĸ ĴŁķ ĶłŁŇŅĴĶŇłŅ ŃĸŅņłŁŁĸĿє Ł ӅӃӄӌё ŇĻňņ ņĸŁŇ ŅĸńňĸņŇņ Ňł ĴņľļŁĺ ļŇ Ňł ņňŃŃĿĸŀĸŁŇ the approach adopted for improved control of the internal flooding risk, to ensure the correct operation of the floor drains, ASN Report on the state of nuclear safety and radiation protection in France in 2019 291 ׏׎ ٲ THE EDF NUCLEAR POWER PLANTS 10