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UNITED STATES I'
j-NUCLEAR REGULATORY COMMISSION y
REGION l 631 PARK AVENUE S
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MAR 311981
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! ' tt Gentlemen:
The enclosed IE Circular No. 31-05, Self-Aligning Red End Bushings For Pi:e Succorts" is for varded to you for informatica.
No wri :en rescense is required.
If you desire accitional information regarding this matter, please contact this office.
Sincerely, W
Soy. H. Grier Director
Enclosure:
1.
IE Circular No. 31-05 with 2 attachments CCNTACT:
L. E. Tripp (2'.5-337-5232) i
-810 413 o51Mr 9
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s LIST OF HOLDERS OF NUCLEAR POWER REACTOR OPERATING LICENSES AND CONSTRUCTICN PERMITS RECEIVING IE CIRCULAR NO.81-05 Baltimore Gas and Electric Company Docket Nos. 50-317 ATTN: Mr. A. E. Lundvall, Jr.
50-318 Vice President, Supply P. O. Box 1475 Baltimore, Maryland 21203 Boston Edison Company M/C Nuclear Docket No. 50-293 ATTN: Mr. A. V. Morisi Nuclear Operations Support Manager 800 Boylston Street Boston, Massachusetts 02199 Connecticut Yankee Atomic Power Company Docket No. 50-213 ATTN:
Mr. W. G. Counsil Vice President - Nuclear Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 Consolidated Edison Company af Docket Nos. 50-03 New York, Inc.
50-247 ATTN: Mr. John D. O'Toole Assistant Vice President - Nuclear Affairs and Quality Assurance 4 Irving Place New York,_New York 10003 Duquesne Light Company Docket No. 50-334 ATTN:
Mr. C. N. Dunn Vice President Operations Division 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Jersey. Central Power and Light Company Docket No. 50-219 ATTN: Mr. Ivan R. Finfrock, Jr.
Vice President Oyster Creek Nuclear Generating Station P. O. Box 388 Forked River, New Jersey 08731 j
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Maine Yankee Atomic Power Company Docket No. 50-309 ATTN: Mr. Robert H. Grace Senior Engineer-Licensing 1671 Worcester Road Framingham, Massachusetts 01701 Metropolitan Edison Company Docket No. 50-289 ATTN: Mr. H. D. Hukill Vice President and Ofrector of TMI-l P. O. Box 480 Middletown, Pennsylvania 17057 Metropolitan Edison Company Docket No. 50-320 ATTN: Mr. G. K. Hovey Vice President and Director of TMI-2 P. O. Box 480 Middletown, Pennsylvania 17057 Niagara Mohawk Power Corporation Occket No. 50-220 ATTN: Mr. T. E. Lempges Vice President Nuclear Generation 300 Erie Boulevard West' Syracuse, New York 13202 Northeast Nuclear Energy Company Docket Nos. 50-336 ATTN:
Mr. W. G. Counsil 50-245 Senior Vice President - Nuclear 50-423 Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 Philadelphia Electric Company Occket Nos. 50-277 ATTN:
Mr. S. L. Daltroff 50-278 Vice President Electric Production 2301 Market Street Philadelphia, Pennsylvania 19101 Power Authority of the State f New York Occket No. 50-286 Indian Point 3 Nuclear Power Plant ATTN: Mr. S. S. Zulla Resident Manager P. O. Box 215 Buchanan, New York 10511 i
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3 Power Authority of the State of New York Docket No. 50-333 James A. FitzPatrick Nuclear Power Plant ATTN: Mr. R. J. Pasternak Resident Manager P. O. Box 41 Lycoming, New York 13093 Public Service Electric and Gas Company Docket Nos. 50-272 ATTN: Mr. F. W. Schneider 50-311 Vice President - Production 80 Park Plaza Newark, New Jersey 07101 Rochester Gas and Electric Corporation Docket No. 50-244 ATTN: Mr. John E. Maier Vice President Electric and St'eam Production 89 East Avenue Rochester, New York 14649 Vermont Yankee Nuclear Power Corporation Docket No. 50-271 ATTN: Mr. Robert L. Smith Licensing Engineer. -
1671 Worcester Road Framingham, Massachusetts 01701 Yankee Atomic Electric Company Docket No. 50-29 ATTN: Mr. James A. Kay Senior Engineer-Licensing 1671 Worcester Road Framingham, Massacnusetts 01701 I
Duquesne Light Company Docket No. 50-412 ATTN:
Mr. E. J. Woolever Vice President 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Jersey-Central Power & Light Company Docket No. 50-363 ATTN: Mr I. R. Finfrock, Jr.
Vice President 260 Cherry Hill Road Parsippany, New Jersey 07054 Long Island Lighting Company Docket No. 50-322 ATTN: Mr. M. S. Pollock Vice President - Nuclear 175 East Old Country Road Hicksville, New York 11801
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Long Island Lighting Company Docket Nos. 50-516 ATTN:
Mr. Charles P. Davis 50-517 Senior Vice President 250 Old Country Road Mineola, New York '11501 Niagara Mohawk Power Corporation Docket No. 50-410 ATTN: Mr. Gerald K. Rhode Vice President System Project Management c/o Miss Catherine R. Seibert 300 Erie Boulevard, West Syracuse, NY 13202 Pennsylvania Power & Light Company Docket Nos. 50-387 ATTN: Mr. Norman W. Curtis.
50-388
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Vice President,
Engineering-an'd Construction - Nuclear 2 North.. Ninth' Street Allentown, Pennsylvania 18101 Philadelp6f a Electric Company Docket Nos. 50-352 ATTN: Mr. John S. Kemper 50-353' Vice President Engineering and Research 2301 Market Street Philadelphia, Pennsylvania 19101 Public Service Electric & Gas Company Docket Nos. 50-354 ATTN: Mr. T. J. Martin 50-355 Vice President Engineering and Construction 80 Park Plaza - 17C Newark, New Jersey 07101 Public Service Company of New Hampshire Occket Nos. 50-443 ATTN:
Mr. W. C. Tallman 50-444 Chairman and Chief Executive Officer 1000 Elm Street Manchester, New Hampshire 03105 Rochester Gas & Electric Corporation Docket No. 50-485 ATTN: Mr. J. E. Arthur Chief Engineer 89 East Avenue Rochester, New York 14649
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SSINS No:
6830 Accession No.:
8011040282 IEC 81-05
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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 March 31, 1981 IE Circular No. 81-05:
SELF-ALIGNING ROD END BUSHINGS FOR PIPE SUPPORTS
Background:
By letter dated July 24, 1980, Bechtel Power Corporation notified NRC of generic deficiencies in pipe support sway struts furnished oy Corner &
Lada, Inc., to the Callaway and Wolf Creek sites.
The specific deficiencies identified involved the clamp end 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 pursuant 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-fally 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, potent-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 loads that could damage the piping or supports.
The corrective actions taken by licensees have been to replace the defective struts or to " stake" the loose bushing in place. However, some of the staked bushings subsequently became loose and had to be reworked. Another potential corrective action would be to shim the clamps where the potential for complete disengagement of the assembly from the bushing is possible.
This method would prevent total disengagement even if the bushing became loose.
If shims are used, consideration should be given to preventing any interference with required rotation of-the assembly.
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IEC 81-05 March 31, 1981 Page 2 of 2 i
Recommended Actions for Holders of Ooerating Licenses or Construction permits:
1.
Determine whether your facility uses pipe strut er snubber assemblies using bushings that could potentially become loose.
2.
Identify from design drawings or field inspections those supports using the strut or snubber assemblies identified in item 1 above where suffi-cient gap ex'sts in the clamp attachment for complete disengagement of the bushing a:J the assembly.
3.
Inspect where practical the snubber or. strut assemblies identified in item 2 above to determine if any bushings are loose or disengaged.
If a large number of supports are involved in this inspection, a statistical sampling may be appropriate to determine if your facility has a problem with loose or disengaged bushings.
4.
If loose or disengaged bushings are found at your facility, take appro-priate corrective actions to ensure that complete disengagement of the assembly from the bushing cannot occur.
No written response to this circular is required.
If you need additional information with regard to this subject, please contact the Director of the appropriate NRC Regional Office.
Attachments:
1.
Sway Strut Assembly:
Figure 211 2.
Recently issued IE Circulars I
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Attacnment 1 March 31, 1981 IEC 81-05 9
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IE Circular 81-05 March 31, 1981 RECENTLY ISSUED IE CIRCULARS Circular Date of No.
Subject Issue Issued to 81-03 Inoperable Seismic 3/2/81 All holders of a Monitoring Instruments power reactor OL or CP 81-02 Performance of NRC-Licensed 2/9/81 All holders of a Individuals While on Outy power, test, or research reactor OL or CP 81-01 Design Problems Involving 1/23/81 All holders of Indicating Pushbutton a power reactor Switches Manufactured by OL or CP Honeywell, Incorporated 80-25 Case Histories of 12/5/80 All holders of a Radiography Events radiography license 80-24 AECL Teletherapy Unit 12/2/80 All holders of a Malfunctions teletherapy license 80-23 Potential Defects in 10/31/80 All holders of a Beloit Power Systems power reactor OL or CP Emergency Generators 80-22 Confirm
- tion of 10/2/80 All holders of a Employee Qualifications power reactor OL or CP 80-21 Regulation of 9/10/80 All holders of Refueling Crews a power reactor OL or CP 80-20 Changes in Safe-Slab 8/21/80 All holders of Tank Dimensions a Part 50 or Part 70 Fuel Facility License 80-19 Noncompliance with 8/26/80 All holders of Licensee Requirements a medical license 80-18 10 CFR 50'.59 Safety 8/22/80 All holders of a Evaluations for Changes to power reactor Radioactive Waste Treatment OL or CP Systems
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