18.08.2015   A. Worrall

Design characteristics of Korean sodium-cooled fast reactor (SFR) and very-high-temperature reactor (VHTR)

15.5.1 SFR

The KALIMER-600 design served as a starting point for developing a new advanced design which is equipped with advanced design concepts and features.

Various advanced design concepts have been proposed and evaluated against the design requirements which were established to satisfy the Gen IV technology

goals.

The top-tier design requirements of a 600 MWe transuranium (TRU) burning fast reactor are categorized by three criteria: general design requirements, safety and investment protection, and plant performance and economy. Details of these design requirements are given in Table 15.2. These requirements reflect the design policies, especially emphasizing proliferation resistance, safety assurance, and metal fuel performance, and form the basis for developing the detailed system design requirements for key NSSS concepts.

Table 15.2 Top-tier design requirements of an SFR demonstration plant

Description

Value

General design

Reactor type

Pool type

Plant size

600 MWe

Plant design lifetime

60 years

Design basis earthquakes

SSE: 0.3 g

Initial core

U-Zr metal fuel

Reloading core

U-TRU-Zr metal fuel

Safety and investment protection Design simplification Negative power reactivity coefficient Core damage frequency (CDF)

Less than E-6/reactor-yr

No fuel-cladding liquid phase propagation during design basis events (DBEs)

Diversified core shut-down mechanism

Reliable and diversified decay heat removal

Accommodating unprotected ATWS events without any

operator’s action

Large radioactivity release

Less than E-7/reactor-yr

3 days grace time w/o any operator’s action for design basis events

Performance and economy

Plant thermal efficiency

Net > 38%

Plant availability

> 70%

Refueling interval

U-Zr initial core > 6 months

Spent fuel storage capacity in RV

TRU burner core > 11 months

> 1.5 cycle discharge

100% off-site load rejection w/o a plant trip Safety grade diesel generator

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