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THE DESIGN and FABRICATION of an OPTICAL PERISCOPE for CORE VIEWING of FAST BREEDER TEST REACTOR (FBTR) by N C Das, San|Iva Kumar

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THE DESIGN and FABRICATION of an OPTICAL PERISCOPE for CORE VIEWING of FAST BREEDER TEST REACTOR (FBTR) by N C Das, San|Iva Kumar B A RC/2004/E/017 5 THE DESIGN AND FABRICATION OF AN OPTICAL PERISCOPE FOR CORE VIEWING OF FAST BREEDER TEST REACTOR (FBTR) by N C Das, San|iva Kumar. O.V Udupa and R P Shukla Spectroscopy Division and AM Kadu and R.K.Modi Division of Remote Handling and Robotics IN0501613 ÏTTTïï VWT Government of India «mur mmuj 3TJWIR Bhabha Atomic Research Centre ggf Mumbai - 400 085, wrw India 2004 BAR C/2004/E/017 GOVERNMENT OF INDIA ATOMIC ENERGY COMMISSION THE DESIGN AND FABRICATION OF AN OPTICAL PERISCOPE FOR CORE VIEWING OF FAST BREEDER TEST REACTOR (FBTR) by N.C. Das, Sanjiva Kumar, D.V. Udupaand R.P. Shukla Spectroscopy Division and A.M. Kadu and R. K Modi Division of Remote Handling and Robotics BHABHA ATOMIC RESEARCH CENTRE MUMBAI, INDIA 2004 BARC72OO4/E/0I7 BIBLIOGRAPHIC DESCRIPTION SHEET FOR TECHNICAL REPORT (•9 per IS : 9400 - 19H0) 01 Security classification : Unclassified 02 Distribution : External 03 Report status : New 04 Series : BARC External 05 Report type : Technical Report 06 Report No. : BARC/2004/E/017 07 Part No. or Volume No. : 08 Contract No. : 10 Title and subtitle : The design and fabrication of an optical periscope for core viewing of fast breeder test reactor (FBTR) I! Collation : 37 p., 13 figs. 13 Project No. 20 Personal author(s) : 1 ) N.C. Das; Sanjiva Kumar; D.V. Udupa; R.P Shukla 2) A.M. Kadu; R.K Modi 21 Affiliation of author(s) : 1 ) Spectroscopy Division, Bhabha Atomic Research Centre, Mumbai 2) Division of Remote Handling and Robotics, Bhabha Atomic Research Centre, Mumbai 22 Corporate author(s) : Bhabha Atomic Research Centre, Mumbai-400 085 23 Originating unit : Spectroscopy Division, BARC, Mumbai 24 Sponsor(s) Name : Department of Atomic Energy Type Government Contd... BAR(72004/H/O17 10 Date of submission July 2004 31 Publication/Issue date August 2004 40 publisher/Distributor : Head, Scientific Information Resource Division, Bhabha Atomic Research Centre, Mumbai 42 Form of distribution Hard copy 50 Language of text : English 51 Language of summary : English, Hindi 52 No. of references : 10 refs. 53 Gives data on : 60 Abstract A FBTR (Fast Breeder Test Reactor) periscope has been designed and fabricated indigenously for viewing and photography/video recording the objects in the reactor core The jn-t iscope consists of a scanning prism mechanism, zoom lens objective, a system of relay lenses and ;m eyepiece sub-assembly for viewing the objects. The objective of the periscope is a zoom lens system lor obtaining a continuously varying magnification from 2X to 5X. Zoom lens objective system has a variable focal length from 100 mm to 250 mm with an aperture varying from 10 mm to 25 mm respectively. This covers a semi-field angle of 3° for the objective tens of focal length of 250 mm and 4° for the objective ni focal length of 100 mm. Two prisms of 45° -90° -45° types are used for scanning the object space in vertical direction. One prism is fixed, whereas the prism facing the object can be rotated about the horizontal axis through an angle of 110°. The rotation of the entire periscope assembly along the vertical axis scans the object space on the horizontal plane. The combination of these two rotations is used to scan the field of interest. It may be noted here that it is absolutely essential to introduce a Pcchan prism before each eyepiece. Pechan prism is used for the rotation of the image, which is produced due to the rotation of the scanning prisms. The measured value of the linear resolution of the instrument is 0.7 mm at an object distance of 2.5 meter from the zoom lens objective system. The periscope has two arm labeled 1 and II. The arm 1 is used for visual inspection, while the arm 11 is used for video recording/photography. The periscope will be used as an in-service instrument for Fast Breeder Test Reactor, IGCAR, Kalpakkam. 70. Keywords/Descriptors PERISCOPES; KALPAKKAM LMFBR REACTOR; SPECIFICATIONS; REACTOR CORES; INSPECTION; SHIELDING; IMAGE SCANNERS; IN-SERVICE INSPECTION 71 INIS Subject Category : S21 99 Supplementary elements : ère fti^W (FBTR) ^^^BF^^ UKKH W fo^ZT (FBTR) % ^ ^ptf ^ ^ 3ÄT tg W MIWÏÏ ^T «IWW 3ÄT foW ftF^ÎT W ft I W <H«wl«H ^ ^Tëft ßr^T H'dWdl, ^T TOTTöt ç^T fepr sfa ^Rpn ^ ^ ^ ^ ^ ^-^eepr £ ft^r i ' ^r i^TTcfi^ tforft^rfr # ^feïï^ft 100 mm 3 250 mmc^ftpRî? fc ^ftl^uj -3R u^i iu tft 10 mm ^ 25 mm «l«ci<1l £ 1250 mm 3ÄT 100 % MÎV^ %feïïT aré-tf^^mSWT: 3°3ft7 4°fr l ^aiïtîT feïï ^ 45°-90°-45° îRFiïT % firt ^r îrôïï feiï no0 «ït ^«bdi 11M^ mwhfer^^kïïfr MIO^T%^Hwh-i^«fafervffnrrlt' i^rr^r £ 2.5 ^ f^RT ^ % fi^ W 4<H»W «BT Mïï 0.7 mm WTOT fr i ^r $ $ t fa^t gnm: I n foïï "W £ I *pT I àpi" ^ ^ ïïïïtïï fà^iï ^ïïïï $ I srafc^r ndI^Itoi/4ifa4>«m!>^ïï^RTà<ftft ïïWt ^TT^ (IGCAR), ^ TOe îft^f fe fc^er (FBTR) % fi^tr XT^> 3RTT - ^Tïïïïtïï^ ^ll^ft l The Design and Fabrication of an Optical Periscope for Core Viewing of Fast Breeder Test Reactor (FBTR) N.C. Das, Sanjiva Kumar, D. V. Udupa, R P. Shukla, A.M. Kadu and R. K. Modi ABSTRACT A FBTR (Fast Breeder Test Reactor) periscope has been designed and fabricated indigenously for viewing and photography/ video recording the objects in the reactor core. The periscope consists of a scanning prism mechanism, zoom lens objective, a system of relay lenses and an eyepiece sub-assembly for viewing the objects. The objective of the periscope is a zoom lens system for obtaining a continuously varying magnification from 2X to 5X. Zoom lens objective system has a variable focal length from 100 mm to 250 mm with an aperture varying from 10 mm to 25 mm respectively. This covers a semi-field angle of 3° for the objective lens of focal length of 250 mm and 4° for the objective of focal length of 100 mm. Two prisms of 45°-90o-45° types are used for scanning the object space in vertical direction. One prism is fixed, whereas the prism facing the object can be rotated about the horizontal axis through an angle of 110°. The rotation of the entire periscope assembly along the vertical axis scans the object space on the horizontal plane. The combination of these two rotations is used to scan the field of interest. It may be noted here that it is absolutely essential to introduce a Pechan prism before each eyepiece. Pechan prism is used for the rotation of the image, which is produced due to the rotation of the scanning prisms. The measured value of the linear resolution of the instrument is 0.7 mm at an object distance of 2.5 meter from the zoom lens objective system. The periscope has two arm labeled I and II. The arm I is used for visual inspection, while the arm II is used for video recording/photography. The periscope will be used as an in-service instrument for Fast Breeder Test Reactor, IGCAR, KaJpakkam. The Design and Fabrication of an Optical Periscope for Core Viewing of Fast Breeder Test Reactor (FBTR) 1. Introduction Periscopes are quite well known optical device for military f I ] and nuclear reactor applications. It is just a telescope having a bent optical path and a limited field of view [2]. These two things make the periscope a complicated optical instrument from the design point of view. Moreover, the final image formed by the periscope must be erect and non-reversed. The periscope may be defined as an instrument in which the general direction of the rays is not in a straight line but is deflected one or more times with the purpose of providing the observer a view from a position in which he cannot put his head. Thus the instrument has a decided offset between the line of sight and viewing (eyepiece) axis. By reason of this offset, observation can be done from confined locations, e.g., from the interiors of armored vehicles, submarine or aircraft. The simplest form of the periscope would be a one or more mirror. The requirements of brightness, image orientation, field of view, and maneuverability have led the periscope to consist of several image-forming optical components. A periscope is supposed to contain a number of lenses in the straight line but they are equipped with a movable prism or mirror mounted in front of the objective lens. By rotating the entire periscope on its optical axis and also moving the prism or mirror, the operator can survey a large volume of space. The periscope under the current project is an in-service inspection instrument and is to be used for visual examination of FBTR (Fast Breeder Test Reactor) main vessel internals in the cover gas space. Inspection of the main vessel is carried out in shutdown condition, in the presence of cover gas, Argon. The periscope has three main parts as objective sub- 1 assembly, main tube sub-assembly and eyepiece module; Main tube sub-assembly contains an image canal to transfer the image of the target area under inspection, to the eyepiece for viewing by the operator. The periscope is provided with two arms, axial and rotational movement system to cover the area of interest for visual examination. Z Design Parameters for the Optical Layout of the Periscope For designing a periscope for viewing in the irradiated or unreachable areas, following requirements [3] must be satisfied: (1) The periscope must move the eye to the other side of a radiation shield.
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