- 38 - the fluid analysis results are not systematically and formally reviewed by the licensee, in particular when the limits set are almost reached, when two analysis methods lead to different results or when the results are abnormal (Bugey, Civaux, Flamanville, Paluel, Penly). Equipment obsolescence While reviewing the end of maintenance reports concerning operations performed recently on the electricity generating sets, the inspectors found that the licensee is faced with problems of obsolescence on the supply of certain spare parts (Chooz). On the occasion of the last complete inspection therefore, the licensee had to keep certain items in service because no spares were available. These parts are currently being procured and to date no item has been replaced by another type of equipment owing to obsolescence. Corrosion During the visits, the inspectors found problems with corrosion, especially on the electricity generating set coolers or certain fire extinguishing system valves (Paluel, Tricastin). Emptying of the day tank The inspectors observed that on the date of the inspection, there was still a risk of emptying of the electricity generating set day tank through inadvertent operation of the remote valve (Civaux). 2.4.4 Combustion turbines (TAC) ASN finds that the checks performed by the licensee on the TAC need to be improved. TAC start-up The inspectors examined the reports of the tests performed by the licensee and ran TAC start-up tests; on this occasion, the inspectors found that: the TAC start-up times were longer than those required by the RGE on several sites (Cattenom, Golfech, Belleville); the Belleville TAC did not start the first time; the Fessenheim TAC was unavailable on the day of the inspection; certain periodic test results, close to the limits set by the RGE (start-up time) or exceeding those of the test procedures (filter head loss, air barrier pressure), are not analysed by the licensee (Flamanville); certain emergency crew procedures were not updated and fail to take account of the specificities of new TACs (Paluel). Other anomalies During the inspections, the inspectors also observed various equipment anomalies affecting the TACs including: damaged electrical cabinet closure system (Civaux); no equipment markings (Civaux); numerous past requests for maintenance not as yet dealt with (Golfech); damaged foaming agent storage trailer (Golfech); damaged vibration pads (Nogent). 2.4.5 Backup turbine generator (LLS) The backup turbine generator (LLS) runs on the steam recovered from the steam generators, driving a turbine coupled to a generator and converting mechanical energy into electrical energy.
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