NPCIL Scientific Assistant case studies
NPCIL Scientific Assistant · Put your knowledge to work in context.
The NPCIL Scientific Assistant recruitment examination is the written screening stage used by Nuclear Power Corporation of India Limited when it hires Scientific Assistants and related Category II technical posts at its nuclear power stations and support facilities. Candidates typically hold a diploma or science degree in physics, chemistry, or a related discipline, and the written test checks whether that technical foundation is intact alongside the general skills expected in a plant environment. The NPCIL Scientific Assistant case studies are 5 cases and about 3,737 words.
1Seal Replacement Under a Tight Dose Constraint
A radiation protection supervisor must plan a 6-hour window for replacing the mechanical seal on a primary coolant pump. A dose-rate survey gives 3.20 mSv/h at the seal flange, 0.80 mSv/h at 1 m from the pump and 0.15 mSv/h at the valve station 3 m away.
743 words, about 4 min2Sump Pump Blockage in a Sludge Pit
A maintenance foreman wants to clear a rag blocking the sump pump of a 4.5 m deep effluent neutralisation pit. Access is through a 1.2 m diameter manhole.
789 words, about 4 min3Is This Filter Sample Above the Reporting Level?
A health physics technician counts an air-filter sample for 10 minutes on a NaI(Tl) detector and obtains 400 gross counts. A 10-minute background count taken the same morning gives 250 counts.
695 words, about 3 min4Demineraliser Train Fails After 18 Hours
The demineralisation plant of a 60 kg/cm² drum boiler has a single two-bed train - strong-acid cation followed by strong-base anion - rated at 12 m³/h with a design run length of 40 hours. Within 18 hours of a fresh regeneration these readings appear: cation outlet sodium 45 µg/L (normal below 5), anion outlet silica 0.07 mg/L (limit 0.02), combined outlet conductivity 0.55 µS/cm (limit 0.20), and treated-water pH 9.4 (normally near 7.0).
736 words, about 4 min5Frozen Trend Line on the Online Dose-Rate Monitor
An online gamma dose-rate monitor at the site boundary feeds an industrial PC that writes one record per minute to a file copied nightly to a NAS. On Monday morning the shift technician sees the trend on the display is a perfectly flat line at 0.11 µSv/h since Saturday noon, with no diurnal variation and no statistical jitter.
774 words, about 4 min