United States Nuclear Regulatory Commission - Protecting People and the Environment

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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