Refer to the drawing of a reactor vessel (RV) differential pressure (D/P) level detection system (see figure below).
A reactor is shutdown with the reactor coolant system being maintained at 100 psia.
The level detector has just been calibrated.
Suddenly, a rupture in the condensing chamber of the level detector results in a rapid drop of the condensing chamber pressure to atmospheric pressure.
Given the following current conditions:
- The condensing chamber is at atmospheric pressure.
- RV pressure is 98 psia and slowly decreasing.
- Bulk reference leg temperature is 120°F.
- Actual RV level has not changed significantly.
Which one of the following describes the current RV level indication from the detector?
A. Off scale low, because the bulk of the water in the reference leg has flashed to steam.
B. Off scale high, because the bulk of the water in the reference leg has flashed to steam.
C. Off scale low, because the static pressure on the reference leg is much less than the static pressure in the RV.
D. Off scale high, because the static pressure on the reference leg is much less than the static pressure in the RV.
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