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Event Report Forms (ERFs) are filed to the IAEA. Sometimes there are multiple event reports, updating the rating, the event description. Here you only see the latest event report

ERF send date: Wed, 24-07-1991
ERF description: During the period from July 22 to August 6, 1991, several hot spots have been discovered at Kozloduy NPP. One being a leak of radioactive water (from the tunnel linking the reactor building Unit 1 and the auxiliary building) which has contaminated one square meter of the ground on site. This leak is probably due to a crack in the concrete through which the recent rains transported active particles. The activity of the soil was 2.5m rem/hour at contact. Investigation of the causes and implementation of corrective actions are in progress.
Two hot spots were discovered on July 24 and 25, both had a gamma activity of 0.2 mR/hr.
Other hot spots were discovered on August 6. Each about 100 cm2. Samples of soil were taken for investigation. The gamma activity of the samples is 0.5 to 1.5 (mR/h) at contact. After the samples were removed the gamma-activity of the spots decreased to the level of the natural background activity. On August 7 two small metallic fragments were discovered in the samples with an activity in the range of 1.2 to 6 (mR/hr) at contact. The nature of the fragments is under investigation.
(See reports of national officer.)
BASIS FOR RATING: Although the events did not affect reactor safety, they revealedfailure to maintain proper control over radioactive materials. Level 1 wasjustified acc. p. 4.4(e) of the user's manual.
DIFFICULTIES IN RATING:
ERF rating date: 01-01-1991
ERF contact person: Mr. T. Gantchev
ERF address: 69 Shipcyenski Prokhod, Bulgaria
ERF affiliation: Inspect. for Safe Use of Atomic Energy, Committee on the Use of Atomic Energy, for Peaceful Purposes

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