干旱区生态环境知识资源中心(Arid): Axial power monitor rod issues and resolution for K-14.1

Arid

DOI	10.2172/144911
报告编号	WSRC-RP--92-594
来源ID	OSTI_ID: 144911
	Axial power monitor rod issues and resolution for K-14.1
	Easterling, T.C.; Fields, C.C.; Hightower, N.T. III; Wooten, L.A. [eds.]; Andre, S.K.; Apperson, C.E.; Bailey, M.H.; Bell, D.L.; Clare, G.H.; Collins, S.L.; Croft, W.D.; Edwards, T.B.; Geiger, G.T.; Harris, S.P.; Lietzow, J.L.; McCulloch, R.W.; McFarlane, A.F.; Randolph, H.W.; Reed, R.L.; Reeve, C.P.; Revolinski, S.M.; Sessions, H.T.; Shine, E.P.; Smith, T.A.; Sossman, C.L.; Taylor, J.J.; Weber, J.H.
英文摘要	A recent concern arose over the treatment of uncertainty associated with the K-Reactor axial power monitors (APMs). There are nine axial power monitor rods located at various positions in the K-Reactor core. By comparing the output of one sensor near the top of the rod to the output of another sensor near the bottom of the rod, the relative ratio of the neutron flux from the top to the bottom of the core can be determined. This ratio is called the roof-top-ratio (RTR) and is the output of a top sensor (Sensor 2) divided by the output of a bottom sensor (Sensor 6). The RTR is important to the safety analyses because when the RTR is maintained within certain ranges, the severity of reactivity transients is limited. There are uncertainties associated with the equipment`s ability to measure the true roof top ratio. It was determined recently that sufficient uncertainty was not accounted for either in reactor operation or in the safety analyses. The concern about uncertainty was addressed for three separate issues. One issue dear with the linear response of the sensors for power ranges planned for K-Reactor operation. The second issue dear with overall uncertainty in the RTR channel. The third issue dear with apparent large ranges in confidence bands for the RTR at low reactor powers as represented by original vendor data. Plots of sparse vendor data indicated unacceptably large uncertainties in RTR would have to be accounted for at the power ranges planned for K-Reactor operation. These concerns were brought to management`s attention through the existing procedures for notification, irrespective of their potential impact on the restart schedule. Analyses have been completed to resolve the APM issues described above, and work is progressing to take the needed steps to change operational procedures.
出版年	1992
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	22 NUCLEAR REACTOR TECHNOLOGY ; K REACTOR ; REACTOR MONITORING SYSTEMS ; SAFETY ANALYSIS ; CONTROL ELEMENTS ; REACTOR SAFETY ; REACTOR CORES ; POWER DENSITY ; MEASURING METHODS
URL	http://www.osti.gov/scitech/servlets/purl/144911
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/264767
推荐引用方式 GB/T 7714	Easterling, T.C.,Fields, C.C.,Hightower, N.T. III,et al. Axial power monitor rod issues and resolution for K-14.1,1992.