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Evaluation of natural circulation cooldown tests performed at Diablo Canyon, San Onofre, and Palo Verde nuclear power plants
The natural circulation cooldown tests performed at Diablo Canyon, San Onofre, and Palo Verde nuclear power plants were evaluated for the compliance with the US Nuclear Regulatory Commission design requirements. BNL concluded that these tests combined with the supporting analyses demonstrated the natural circulation, boron mixing, and cooldown capability of these plants
A verification or Relap5/mod2 Code using OECD CSNI ISP 26 Standard Problem Calculation (in Croatian)
Pioneering role of IRIS in the resurgence of Small Modular Reactors
This paper presents an overview of the first 10 years
of the IRIS project, summarizing its main technical
achievements and evaluating its impact on the resurgence
of small modular reactors (SMRs). SMRs have
been recurrently studied in the past, from early days of
nuclear power, but have never gained sufficient traction
to reach commercialization. This situation persisted also
in the 1990s; the focus was on large reactors based on
the presumed common wisdom of this being the only way
to make the nuclear power plants competitive. IRIS is
one of several small reactor concepts that originated in
the late 1990s. However, the specific role and significance
of IRIS is that it systematically pursued resolving
technology gaps, addressing safety, licensing, and deployment
issues and performing credible economics analyses,
which ultimately made it possible—together with
other SMR projects—to cross the “skepticism threshold” and led the making of a convincing case—domestically
and internationally—for the role and viability of smaller
reactors. Technologically, IRIS is associated with a number
of novel design features that it either introduced or
pursued more systematically than its predecessors and
ultimately brought them to a new technical level. Some of
these are discussed in this paper, such as the IRIS Safetyby-
Design, security by design, the innovative thermodynamic
coupling of its vessel and containment, systematic
probabilistic risk assessment–guided design, approach
to seismic design, approach to reduce the emergency
planning zone to the site boundary, active involvement of
academia, and so on. Many individuals and organizations
contributed to that work, too many to list individually,
and this paper attempts to pay tribute at least to
their collective work