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Responds to 700826 ltr requesting rept on investigation of steam generator pressure relief valve failure in April 1970. Summary of insp findings & licensee detailed account of accident encl.
Accession Number: ML19289B536
Date Released: Saturday, November 7, 2020
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- ML20086B497 - Responds to 700826 ltr requesting rept on investigation of steam generator pressure relief valve failure in April 1970. Summary of insp findings & licensee detailed account of accident encl. (2 page(s), 9/22/1970)
- ML20086B500 - "Summary of Steam Line Safety Valve Occurrence." (2 page(s), 9/22/1970)
- ML20086B507 - Requests rept re 700428 explosion at facility. (1 page(s), 8/26/1970)
- ML20086B512 - Forwards Parameter rept on revised installation of safety valves.Out-of-code condition during discharge under present "redesigned" condition should specifically be noted. (1 page(s), 7/14/1970)
- ML20086B516 - Forwards "Stress Analysis of Modified Main Steam Safety Valve Nozzle & Adjacent Steamline." (4 page(s), 7/10/1970)
- ML20086B524 - "Stress Analysis of Modified Main Steam Safety Valve Nozzle & Adjacent Steamline." (10 page(s), 7/10/1970)
- ML20086B528 - Forwards "Steam Pipe Break." Rept describes incident & result of investigation of rupture of main steam safety valve connecting pipe.Revised Page 9 to "Tendon Analysis Rept," encl.W/o encl. (2 page(s), 7/3/1970)
- ML20086B532 - Div of Compliance Monthly Rept,June 1970. (1 page(s), 6/30/1970)
- ML20086B537 - Forwards Parameter,Inc 700609 ltr rept re 700428 safety valve installation failure.Ltr rept suppls info discussed in Rept DC-67.As-built safety valve installation at variance w/recommended vendor installation.W/o encl. (1 page(s), 6/25/1970)
- ML20086B544 - Forwards Parameter 700609 ltr supplementing "Robinson-2, Failed Safety Valve Nozzle," and supplemental ltr to rept dtd 700526.W/o encl. (1 page(s), 6/19/1970)
- ML20086B549 - Forwards rept of 700515 special insp at Ebasco Svcs,Inc. Insp reviewed results of design analysis of steam operator safety valve installation failure on 700428. (2 page(s), 6/4/1970)
- ML20086B560 - Forwards trip rept of 700515 visit to Ebasco Svcs,Inc to obtain results of design analysis of failed steam safety valve nozzle & obtain info re metallurgical analysis of failure. (2 page(s), 5/28/1970)
- ML20086B568 - Submits addl comments re valve nozzle failure & recommendations for followup actions.Apparent departure from recommended valve installation practices warrant thorough review of main steam safety valve nozzle problem. (8 page(s), 5/26/1970)
- ML20086B573 - "Rept on Design & Stress Evaluation of Failed Main Steam Safety Valve Nozzle." (46 page(s), 5/23/1970)
- ML20086B578 - Forwards two recent repts containing info on failure of safety valve nozzle.Pressurizer heaters automatically turned off when pressurizer water reached level of 12%.W/o encl. (1 page(s), 5/27/1970)
- ML20086B589 - Forwards Parameter,Inc preliminary rept on stress evaluation of failed safety valve nozzle on 700428.W/o encl. (1 page(s), 5/25/1970)
- ML20086B591 - Forwards Rept DC-67 covering trip to Ebasco & stress evaluation of nozzle failure.W/o encl. (1 page(s), 5/24/1970)
- ML20086B596 - Forwards trip rept of 700506 visit to Westinghouse Research Lab in Pittsburgh,PA to review analysis of steam generator safety valve transition piece failure on 700428. (1 page(s), 5/22/1970)
- ML20086B639 - Forwards two inquiry memos providing background info on failure of steam generator pressure relief valve installation. (1 page(s), 5/12/1970)
- ML20086B641 - Inquiry memo re failure of 6-inch transition piece between main steam line & safety valve.Circumstances associated w/incident should be disseminated to other Ebasco-designed reactor facilities. (2 page(s), 4/30/1970)
- ML20086B647 - Inquiry memo re failure of 6 inch transition piece between main steam line & safety valve. (2 page(s), 4/29/1970)
- ML20086B648 - Informs of firm arrangements made to conduct insp of Ebasco investigation on failure of steam generator relief valve installation. (1 page(s), 5/11/1970)
- ML20086B653 - Discusses difficulty w/CP&L in arranging for inspectors to continue investigation of failure of 6 inch relief valve transition pipe. (4 page(s), 5/7/1970)
- ML20086B656 - Forwards newspaper clippings & radio press release re failure of steam generator relief valve installation. (1 page(s), 5/7/1970)
- ML20086B660 - Forwards newspaper clippings & radio press release re steam line explosion at facility on 700428. (5 page(s), 5/1/1970)
- ML20086B662 - Forwards announcement by util re recent accident. (2 page(s), 5/4/1970)
- ML20086B668 - Forwards rept to Director of Regulation re failure of steam generator pressure relief valve.W/o encl. (1 page(s), 5/4/1970)
- ML20086B674 - Advises that JO Graham of Joint Committee on Atomic Energy was informed of 700428 accident at facility on 700429. (1 page(s), 5/1/1970)
- ML20086B679 - Forwards rept of accident on 700428. (1 page(s), 5/1/1970)
- ML20086B683 - "Failure of Steam Generator Pressure Relief Valve at CP&L." (3 page(s), 5/1/1970)
- ML20086B687 - Discusses failure of steam safety valve on 700428.Seven workers injured. (2 page(s), 4/29/1970)