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Cake day: September 26th, 2025

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  • Per the IAEA report on Chernobyl, page 4:

    The control rods and the safety rods of an RBMK reactor are inserted into the reactor core from above, except for 24 shortened rods which are inserted upwards and which are used for flattening the power distribution. A graphite rod termed a 'displaced is attached to each end of the length of absorber of each rod, except for twelve rods that are used in automatic control. The lower displacer prevents coolant water from entering the space vacated as the rod is withdrawn, thus augmenting the reactivity worth of the rod. The graphite displacer of each rod of all RBMK reactors was, at the time of the accident, connected to its rod via a ‘telescope’, with a water filled space of 1.25 m separating the displacer and the absorbing rod (see Fig. 1). The dimensions of rod and displacer were such that when the rod was fully extracted the displacer sat centrally within the fuelled region of the core with 1.25 m of water at either end. On receipt of a scram signal causing a fully withdrawn rod to fall, the displacement of water from the lower part of the channel as the rod moved down- wards from its upper limit stop position caused a local insertion of positive reactivity in the lower part of the core. The magnitude of this ‘positive scram’ effect depended on the spatial distribution of the power density and the operating regime of the reactor.








  • When asked if he had been bitten by ticks, his wife said he had in the past and that, earlier in the summer, he has at least 12 or 13 “chigger” bites around his ankles. Researchers said that in the eastern U.S., what are sometimes referred to as “chiggers” are often larvae of lone star ticks

    TIL. What an unpleasant and unexpected way to go. Even if they’d considered alpha gal, he could have rightfully said “well it’s not like anyone has ever died from it” and opted to wait to see if symptoms continued. I’ve had a bad stomachache after a meal before, and I wouldn’t immediately jump to this as a possibility, especially if I didn’t know I’d been bitten by a lone star.

    Tragic, RIP to bro