In-Service Inspection of Nuclear Power Plants - gnssn - International ...

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This publication is no longer valid Please see http://www-ns.iaea.org/standards/ Doc.-No. KKG-Q-PSOO5 NUCLEAR POWER PLANT GOESGEN-DAENIKEN LTD Yoke magnetization: Annex 5 Page: 1 out of: 2 Rev Division of examination area and positioning of yoke magnet 1. Examination of welds Provided that accessabillty is adequate, inspection is performed on both surfaces. _Circumferentiaj_and_^ongitud^nal » seam welds The yoke magnet must be so positioned that the poles rest squarely on the material. Note overlapping "a". The examination areas on both sides of the weld area extend to at least 20 ran. 1.2 Fillet and nozzle welds For examination of transverse defects the poles of the yoke magnet are placed directly on the weld. The field strength must be checked with the Berthold magnetic field indicator for each weld test. For examination of longitudinal defects the yoke magnet is set at an angle of 90 ' to the weld. Pole pieces bevelled at AS " should preferably be used here. 134
This publication is no longer valid Please see http://www-ns.iaea.org/standards/ Doc.-No. KKG-Q-PSOO5 NUCLEAR POWER PLANT GOESGEN-DAENIKEN LTD Annex. 5 Page- 2 out of: 2 Rev. With nozzle welds the fillet must always be included in the examination area, i.e. the yoke magnet is to be placed in the weld area as shown under 1.1 and in the fillet area as shown in 1.2. Since the contact area of the yoke magnet with the test surface is limited with nozzle welds, adequate field strength must be demonstrated in respect of each weld by means of a tangential field strength measuring instrument. Jf magnetization is insufficient, another test technique or method, e.g. circular magnetization or liquid penetration, must be applied. 2. Basic material testing Large surfaces on vessels etc. are to be divided into squares of max. 100 mm side length. 6 c' D A D \E -Q D' B o \ A' O 4 cm Test area \ D O a D' a Sequence: AA-A'A 1 BB-B'B 1 CC-C'C DD-D'D' Check with the Berthold magnetic field indicator whether there is sufficient magnetization, and if not, select further intermediate positions. 135
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