ML20004F286
| ML20004F286 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Cooper, Arkansas Nuclear, River Bend, Waterford, South Texas, Comanche Peak, Fort Calhoun, Fort Saint Vrain  |
| Issue date: | 04/21/1981 |
| From: | Madsen G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | ARKANSAS POWER & LIGHT CO., GULF STATES UTILITIES CO., HOUSTON LIGHTING & POWER CO., KANSAS GAS & ELECTRIC CO., LOUISIANA POWER & LIGHT CO., NEBRASKA PUBLIC POWER DISTRICT, OMAHA PUBLIC POWER DISTRICT, PUBLIC SERVICE CO. OF COLORADO, TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| NUDOCS 8106180083 | |
| Download: ML20004F286 (1) | |
Text
{{#Wiki_filter:. j ~ ;- M** UNITED STATES <T 9 f+ i; NUCLEAR REGULATORY COMMISSION O 'o 8((' ' i.h,,/l 1 RtciON iv \\, ,,,,. 611 RYAN PLAZA DRIVE. SUITE 1000 8 d/ ARLINGTON. TEXAS 76011 ] g "O E IO April 21,1981 f%". %%y MEMORANDUM FOR: Those Listed Below di Th FROM: G. L. Madsen, Chief, Reactor Projects Branch, IE:RIV
SUBJECT:
IE CIRCULAR NO. 81-05 Subject IE Circular has been sent to the following listed licensees. A cop 3 of the IE Circular is attached for your information. Arkansas Power & Light Company Gulf States Utilities AN0-1 & 2 (50-313; 50-368) RiverBend(50-458;50-459) Nebraska Public Power District Houston Lighting & Power Company CooperNuclearStation(50-298) SouthTexas(50-498;50-499) Omaha Public Power District Kansas Gas & Electric Company Fort Calhoun (50-285) Wolf Creek (STN 50-482) Public Service Company of Colorado Louisiana Power & Light Company Fort St. Vrain (50-267) Waterford-3(50-382) Texas Utilities Generating Company Comanche Peak (50-445; 50-446) .I$f$GW 'G. L. Madsen, Chief Reactor Projects Branch ATTACHMENT: As stated DISTRIBUTION: IE/DMS MPA/L0EB IE/RPRIB IE/ REB IE/SRSI IE/EP ADM/DMB 810618006 3
SSINS No: 6830 Accession No.: 8011040282 IEC 81-05 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 IE Circular No. 81-05 March 31, 1981 Page 1 of 2 SELF-ALIGNING ROD END BUSHINGS FOR PIPE SUPPORTS B,ackground: By letter dated July 24, 1980, Bechtel Power Corporation notified NRC of generic deficiencies in pipe support sway struts furnished by Corner & Lada, Inc., to the Callaway and Wolf Creek sites. The specific deficiencies identified involved the clamp erd of the sway strut becoming loose and possibly being disengaged from the bushing. This could result in a large gap in the support system not accounted for in the original analysis. This deficiency was reported to NRC pursusat to 10 CFR Part 21 on May 14, 1980. In another letter dated October 8,1980, Bechtel Power Corporation notified NRC of generic deficiencies in pipe support end bushings at Midland Units 1 and 2 and at Palisades. In this report, self-aligning rod end bushings on the ends of sway struts and snubbers furnished by ITT Grinnell, Pacific Scientific, NPSI, and Corner & Lada were found to be partially or totally disengaged from the structural component. This report was identified as a 10 CFR Part 21 notification. Discussion: The problem of loose bushings in snubber and sway strut assemblies is potent-ially generic to all sizes of all manufacturers' assembles. However, the potential for complete disengagement of the bushing from the assembly is limited to those cases in which the assembly is attached to a clamp where the gap is sufficiently large to permit the paddle to slide completely over the bushing. The consequences of complete disengagement of the bushing would be to inval-idate the original analytical assumptions used in the piping analysis, tent-ially creating an overstress condition in the piping or overloading the supports. This would be more significant for the seismic event since the gap would change the dynamic characteristics of the system and lead to impact e., _ lpad %t3=t.cnold d=ma PaainVa y c'morts. h1 _. ..m 'I' l c e ( DUPLICATE DOCUMENT q Entire document previously ? g entered into system under: Q i Tso llottom 4 l4 ANo 4 No. of pages: /,/ O Y, r V--- m =}}