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Publicatie Laka-bibliotheek:
TMI. A review of the accident and its implications for CANDU (1980)

Auteur	Pannell, Campbel, . AECL
Datum	maart 1980
Classificatie	6.01.3.30/05 (VEILIGHEID - REACTOREN - CANDU)
Voorkant

EXTENDED SUMMARY

I. THE ACCIDENT

At 4 a.m. 28 March 1979, unit 2 of the Tree Mile Island Nuclear Generating Station 
experienced a total interruption of boiler feedwater flow, which, because of the small 
inventory of water in the boilers, led to a rapid decrease in the removal of heat from 
the reactor am consequently a rapid increase in primacy coolant pressure. The reactor 
tripped on high coolant pressure, as it is designed to do, but not before a relief 
valve* on the pressurizer opened, discharging coolant into a drain tank. The auxiliary 
feedwater pumps had started automatically when the normal supply was interrupted 
but on feedwater reached the boilers because isolating valves had been left closed. 
When these valves were finally re-opened (after 8 minutes), re-establishing boiler 
feedwater flow, the boilers had been dry for 6 minutes.

* This valve was not one of the safety valves required by the pressure vessel code.
It was there to keep the coolant pressure below the reactor trip level for minor 
feedwater transients (which this was not) and had a set point considerably (200 psi) 
below that of the code safety valves.

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