ML20003C456
| ML20003C456 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 02/19/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8103060111 | |
| Download: ML20003C456 (3) | |
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o UNITED STATES
!I NUCLEAR REGULATORY COMMISSION i
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FEB 131981
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Docket No. 50-358 k,,
Mr. Earl A. Borgmann Vice President - Engineering Cincinnati Gas & Electric Company P. O. Box 45201
Dear Mr. Borgmann:
SUBJECT:
PRESERVICE INSPECTION AND TESTING OF SNUBBER Dua to a long history of problems dealing with inoperable and incorrectly installed snubbers, and due to the potential safety significance of failed snubbers in safety related systems and components, it is requested that maintenance records for snubbers be documented as follows:
Pre-service Examination A pre-service examination should be made on all snubbers listed in tables 3/7-4a and 3.7-4b of Standard Technical Specifications 3/4.7.9. This exami-nation should be made after snubber installation but not more than six months prior to initial system pre-operational testing, and should as a minimum verify the following:
(1) There are no visible signs of damage or impaired operability as a result of storage, handing, or installation.
(2) The snubber location, orientation, position setting, and configuration (attachments, extensions, etc.) are according to design drawings and specifictions.
(3) Snubbers are not seized, frozen or jamed.
(4) Adequate swing clearance is provided to allow snubber movement.
(5) If applicable, fluid is to the recommended level and is not leaking from the snubber system.
(6) Structural connections such as pins, fasteners and other connecting hardware such as lock nuts, tabs, wire, cotter pins are installed correctly.
6103 0gg G
Mr. E. A. Borgmann 2-If the period between the initial pre-service examination and initial system pre-operational test exceeds six months due to unexpected situations, re-examination of items 1, 4 and 5 shall be performed. Snubbers which are installed incorrectly or otherwise fail to meet the above requirements must be repaired or replaced and re-examined in accordance with the above criteria.
Pre-Operational Testing During pre-operational testing, snubber thermal movements for systems whose operating temperature exceeds 250' F should be verified as follows:
(a) During initial system heatup and cooldown, at specified temperature intervals for any system which attains operating temperature, verify the snubber expected thermal movement.
(b) For those systems which do not attain operating temperature, verify via observation and/or calculation that the snubber will accommodate the projected thermal movement.
(c) Verify the snubber swing clearance at specified heatup and cooldown interval s. Any discrepencies or inconsistencies shall be evaluated for cause and corrected prior to proceeding to the next specified interval.
The above described operability program for snubbers should be included and documented by the pre-service inspection and pre-operational test programs.
The pre-service inspection must be a prerequisite for the pre-operational testing of snubber termal motion. This test program should be specified in Chapter 14 of the FSAR.
Sincerely, h
d,[Em Robert L. Tedesco, Assistant Director for Licensina Division of Licensing cc: See next page O
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Mr. Earl A. Borgmann Vice President - Engineering Cincinnati Gas & Electric Company P. O. Box S60 Cincinnati, Ohio 45201 cc: Troy B. Conner, Jr., Esq.
Leaa 7 Kosik, Esq.
Conner, Moore & Corber 3454 Cornell Place 1747 Pennsylvania Avenue, N.W.
Cincinnati, Ohio 45220 "
Washington, D.C.
20006 W. Peter Heile, Esq.
Mr. Wiiliam J. Moran Assistant City Solicitor General Counsel Room 214, City Hall Cincinnati Gas & Electric Company Cincinnati, Ohio 45220 P. O. Box 960 Cincinnati, Ohio 45201 John D. Woliver, Esq.
Clermont County Comunity Council Mr. William G. Porter, Jr.
Box 181 Porter, Stanley, Arthur Batavia, Ohiu 45103 and Platt 37 West Broad Street firs. Mary Reder Columbus, Ohio 43215 Box 270, Rt. 2 California, Kentucky 41007 Mr. James D. Flynn, Manager Licensing Environmental Affairs Andrew B. Dennison, Esq.
Cincinnati Gas & Electric Company 200 Main Street P. O. Box 960 Batavia, Ohio 45103 Cincinnati, Ohio 45201 hubert A. Jones, Esq.
David Martin, Esq.
Prosecuting Attorney cf Clermont Office of the Attorney General County, Ohio 209 St. Clair Street 154 Main Street First Floor Batavia, Ohio 45103 Frankfort, Kentucky 40601
- Resident Inspector /Zimer Dr. Frank F. Hooper
_ RFD 1, P. O. Box 2021 t.
School of Natural Resources U. 5. Route 52 University of Michigan
' Moscow, Ohio.
45153 Ann Arbor, Michigan 48109 Mr. John Youkilis Charles Bechhoefer, Esq., Chairman Office of The Honorable William Gradison Atomic Safety & Licensing Board Panel United States House of Representatives
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U.S. Nuclear Regulatory Comission Washington, D. C.
2.0515 Washington, D.C.
20555 Mr. Glenn 0. Bright Atomic Safety & Licensing Board Panel U.S. Nuclear Regulatory Comission Washington, D.C.
20555
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