Bulletin 75-001A: Through-Wall Cracks in Core Spray Piping at Dresden-2
BL75001A J. P. O'Reilly, Director, Region I N. C. Moseley, Director, Region II J. G. Keppler, Director, Region III E. M. Howard, Director, Region IV R. H. Engelken, Director, Region V IE BULLETIN NO. 75-01A - THROUGH-WALL CRACKS IN CORE SPRAY PIPING AT DRESDEN-2 The subject Bulletin should be dispatched for action to all BWR facilities with operating licensees by close of business today. The Bulletin should also be dispatched for information to all BWR facilities with construction permit and to all PWR facilities with operating license no later than close of business on February 10, 1975. The text of the Bulletin and draft letters to licensees are enclosed for this purpose. John G. Davis, Deputy Director for Field Operations Office of Inspection and Enforcement Enclosures: As stated . (Draft letter to all BWR facilities with operating license) IE Bulletin No. 75-01A Gentlemen: Enclosed is IE Bulletin No. 75-01A which revises the actions required of you in response to IE Bulletin No. 75-01. Should you have questions regarding this Bulletin or the actions required of you, please contact this office. Sincerely, Director Enclosure: IE Bulletin No 75-01A Approved by GAO, B-180225 (R0072), clearance expires 7-31-77. Approval was given under a blanket clearance specifically for identified generic problems. . (Draft letter for information to all BWR facilities with construction permit and to all PWR facilities with operating license.) IE Bulletin 75-01A Gentlemen: Enclosed is IE Bulletin 75-01A which is forwarded to you for information. No action is required of you if you do not have a boiling water reactor with operating license. Should you have questions regarding this Bulletin, please contact this office. Sincerely, Director Enclosure: IE Bulletin 75-01A . IE Bulletin No. 75-01A Date: 2/7/75 THROUGH-WALL CRACKS IN CORE SPRAY PIPING AT DRESDEN-2 (REFERENCE: IE BULLETIN NO. 75-01, DATED 1/30/75) The purpose of this bulletin is to confirm the understanding given verbally to BWR licensees regarding acceptable methods of implementing IE Bulletin 75-01. 1. Volumetric examinations of those welds specified in IE Bulletin No. 75-01 should cover a distance of approximately six times the pipe wall thickness (but not less than 2 inches, and need not exceed 8 inches) each side of the weld. Ultrasonic examinations of welds between piping and cast components (valves, pump bodies, etc.) may be conducted from the pipe side of the weld, but should be conducted such that the ultrasonic beam fully penetrates the weld and heat affected zone of the cast component. 2. Ultrasonic or other volumetric examinations within the areas defined in 1., above, shall, as a minimum, be consistent with the procedures licensees have used previously during the conduct of baseline and/or inservice inspections. Where necessary for evaluation or confirmation of ultrasonic indications, supplementary,examination techniques shall be used. 3. The bulletin does not require examination of reactor coolant pressure boundary welds in austenitic stainless steel piping 2 inches nominal pipe size and smaller or pipe welds in material other than austenitic stainless steel. This does not exclude the required examination of the core spray nozzle to safe-end welds. 4. If a specified system has two or more branch piping runs which are substantially the same (size, length, complexity, etc.) select for examination, two welds from one of the branches. Where branches are not substantially the same (e.g., differ in pipe size complexity or length), select for examination two welds from each branch.
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