[en] Tarapur Atomic Power Station 1 and 2 (TAPS 1 and 2) is a twin Boiling Water Reactor (BWR) nuclear power station, with each unit operating at 160 MWe. Both the units were commissioned in November 1969 and completed about 37 years of commercial operation. Station has an effective Operating Experience (OE) programme. Throughout the operating history, station has been effectively utilizing in-house, national and international OE information. Based on this information, station has incorporated various modifications in the plant systems and practices. Information on inhouse as well as overseas industry experience is reviewed in a systematic manner by the Operating Experience Review Committee (OERC), comprising of members from different sections. This paper depicts an overview of OE programme at TAPS 1 and 2. Station OE organization and OE programme including review, analysis, dissemination and application of OE information for enhancing safety and reliability of plant are discussed in this paper. (author)

[en] Nuclear Power Corporation of India Limited (NPCIL) is a Public Sector Enterprise under Department of Atomic Energy (DAE), Government of India. NPCIL is operating 21 nuclear power plants and 5 nuclear power plants are under construction. NPCIL has an established organizational set-up to implement Industrial and Fire Safety requirements as per the applicable statutes and regulations. As part of industrial activities, sometimes there could be accidents due to unsafe conditions, unsafe acts or both. However, most of the accidents are preventable. The organization has issued a Head Quarter Instruction (HQI) for reporting and investigation of all types of accidents including Near Miss Accidents (NMAs). NMAs are the unplanned events, which have occurred, but did not result into injury or damage. It is very important that all NMAs are identified, reported, analyzed and corrective action taken to eliminate unsafe conditions or unsafe acts, which have caused these incidents. 'Reporting, analyzing and correcting the causes of NMAs' is one of such efforts enhanced in NPCIL to prevent accidents. Also, there exists a system for dissemination of information on incidents including NMAs among the NPCIL Units. This paper gives case study on some NMAs reported at NPCIL units during the year -2015 demonstrating the importance of the accidents prevention program. (author)

[en] Tarapur Atomic Power Station 1 and 2 (TAPS 1 and 2) is a twin Boiling Water Reactor (BWR) nuclear power station, with each unit operating at 160 MWe. Both the units were commissioned in November, 1969 and completed about 40 years of commercial operation. At TAPS-1 and 2, electrical cable penetration fire barriers of required fire ratings are installed in different fire compartments to ensure integrity of the compartments. However, while implementing various modifications, these fire barriers need to be broken for cable routing or re-routing etc. If there is some lapse in normalisation of fire barriers after breaking, it may remain in open condition, until it is noticed during the next periodic inspection. Till that time, the broken fire barrier at electrical cable penetration may remain in breached condition. In order to alleviate this concern, a software based fire barrier permit system was developed and integrated with the existing Computerised Maintenance Management System (CMMS). This permit system is designed for tracking works on fire barriers, right from the permit initiation for fire barrier breaking to surrendering of permit after normalisation of fire barriers. This paper looks into salient features of 'Fire Barrier Permit System' introduced at TAPS-1 and 2 from fire safety point of view involving electrical cable or cable penetration. This paper briefly touches upon the salient features of fire barriers, fire rating of the compartments, standard time-temperature curve and qualification test of fire barriers also. (author)

[en] Tarapur Atomic Power Station 1 and 2 (TAPS 1 and 2) is a twin Boiling Water Reactor (BWR) nuclear power station, with each unit operating at 160 MWe. Both the units were commissioned in November 1969 and completed about 40 years of commercial operation. Since TAPS-1 and 2 being one of the oldest BWR design nuclear power stations, electrical safety features of the facility were reviewed from time to time. Due to self-initiation of the utility and also in response to the recommendations of various regulatory bodies and expert committees, major safety up-gradation of the facility was carried out in the year 2005 and 2006. Several electrical and fire safety issues were addressed during the safety up-gradation to meet current nuclear industry standards. As on 30th September 2009 station has completed 1963 fire incident free days and station has been receiving AERB Fire Safety Awards consecutively since the year 2005. This could be achieved due to dedicated fire prevention measures and constant vigil by plant staff. This paper looks into the lessons learnt from a few electrical fire incidents occurred at the station in the past and the corrective measures taken to prevent recurrence of similar incidents. (author)