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Forwards followup rept AO 50-313/74-11C.Promised at 751010 meeting w/Region IV in Little Rock,AR.

Accession Number: ML19326B653

Date Released: Friday, December 6, 2019

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• ML19326B651 - Forwards followup rept AO 50-313/74-11C.Promised at 751010 meeting w/Region IV in Little Rock,AR. (2 page(s), 10/31/1975)
• ML19326B658 - AO 50-313/74-11C:on 741107,reactor bldg spray pump P35B suction line leaked.Cause discussed in encl "Failure Analysis of Schedule 10S Piping" rept & corrective action in encl insp & examination program. (51 page(s), 10/31/1975)
• ML19326B662 - Forwards final rept AO 50-313/74-11B promised in util 750205 ltr.Investigation complete except for study re probability of catastropic failure of schedule 10 stainless steel piping under design stresses. (3 page(s), 8/29/1975)
• ML19326B664 - AO 50-313/74-11B:on 741107,reactor bldg spray pump P35B suction line leaked.Caused by intergranular stress-assisted corrosion cracking.Cracked sections of piping replaced. (4 page(s), 8/29/1975)
• ML19326B670 - Provides status rept on investigation of leaks noted in 741118 & 750205 transmittal of AOs 50-313/74-11 & 50-313/74-11A,respectively.Results of examinations to be available 60 days after final sample is taken. (3 page(s), 4/11/1975)
• ML19326B676 - Advises that crossconnect line reactor bldg spray sys will be removed per AOs 50-313/74-11 & 50-313/74-11A.No unreviewed safety question involved in design change. (2 page(s), 3/25/1975)
• ML19326B683 - Forwards AO 50-313/74-11A,supplementing 741118 transmittal of AO 50-313/74-11. (2 page(s), 2/5/1975)
• ML19326B687 - AO 50-313/74-11A:on 741107,reactor bldg spray pump P35B suction line leaked.Caused by intergranular stress-assisted corrosion cracks.Piping partially replaced.Pictorial review of cracks encl. (39 page(s), 1/22/1975)
• ML19326B691 - Forwards AO 50-313/74-11.Util 741113 telegram identified addl leak made during repairs of initial leak. (1 page(s), 11/18/1974)
• ML19326B694 - AO 50-313/74-11:on 741107,reactor bldg spray pump P35B suction line leaked.Cause unknown.Spool piece will be removed for replacement & metallurgical testing. (3 page(s), 11/15/1974)