HOT-STATE REACTIVITY REAL-TIME MONITORING AND THE DETERMINATION OF PHOTONEUTRON BACKGROUND SOURCE IN HEAVY WATER RESEARCH REACTOR

During the operation of nuclear reactor, it is important to monitor the reactivities at real-time for the safety of reactor. A FORTRAN computer program it developed for this purpose and experiments are done at the Heavy Water Research Reactor (HWHR) for testing. Besides, relevant reactivity of photoneutron background source is got from the statistics analysis of the real-time reactivities at the normal operation state. A new method is provided for the determination of the photoneutron background source in Heavy Water Reactor. The experimental results show that at the normal operation state, the relevant reactivity of photoneutron background source in HWRR is + 1.09×10~(-3).