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Example E.5—Cont’d
PLAN TOP VIEW
0°
57
49
41
33
90°
25
17
09
08 16 24 32 40 48 56
LPRM Detector String Locations.
BWR–4 Core map.
FIG. E.8
Core map of a BWR-4 showing in-core neutron detector strings. There are 40–50 LPRM
(local power range monitor) detector strings in a typical 1200 MWe reactor core [3].
0
TRANSIT TIME = 0.167 S.
B–C VELOCITY = 5.48 M/S.
–200
LINEAR FIT
PHASE (DEG) C
D
–400
B
A
–600
0 2 4 6 8
FREQUENCY (Hz)
FIG. E.9
Phase angle between detectors B and C, and the linear fit to the phase. Flow transit time or
delay time from B to C, τ¼0.17s. Estimated two-phase flow velocity¼18ft/s (5.48m/s).
