Question

5) Coolant circulation pump X for continuous operation in a nuclear power station has MTBF = 2 yrs. and MTTR = 10 hrs. A standby older pump Y with the same capacity is also used with MTBF = 22 mo. and MTTR = 15 hrs. Perfect switching between pumps A and B of the plant is assumed.

(i) Draw the detailed Markov process graph of the cooling pump system and determine the limiting (steady-state) probability of all states that it is possible to find the system in.

(ii) What is the availability of the nuclear station’s pumping system?

Answer 1

Solulion Compomern ' aio 9/v va ol to f.rsi ad coolon Ciculaon pump Hu Se con AsSume Passibie tates Heve, three oes are Possibe bote coolo

.30, 8I -3D R Cica OY DiOS Since s gyeale1 han ulated Value o t calu CrPlical value 4hen reecl Aa no P- valu - yPothess Hen conclode that fa rue