ML19341D047
| ML19341D047 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 02/11/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Aswell D LOUISIANA POWER & LIGHT CO. |
| References | |
| NUDOCS 8103040761 | |
| Download: ML19341D047 (4) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION a
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Docket No. 50-382
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I' FEB 111981
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Mr. D. L. Aswell TEg 2 0 79SI r
Vice President, Power Production 10) u, D j'ty con Louisiana Power & Light Company 142 Delaronde Street A
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Dear Mr. Aswell:
SUBJECT:
PRESERVICE INSPECTION AND TESTING OF SNUBBERS The Office of Inspection and Enforcement has requested that preservice inspection and test requirements for snubbers be included in the licensing process. Based on this request and the long history of snubber problems as documented by Licensee Event Reports on the subject of inoperable and incorrectly installed snubbers, it is requested that the enclosed requirements to ensure snubber operability be implemented at the Waterford Steam Electric Station, Unit No. 3.
This test program should be specified in the next amendment to the FSAR.
Sincerely, Robert L. Tedesco Assistant Director for Licensing Division of Licensing
Enclosure:
A:; stated CC w/ enclosure:
See next page 310804076l U
Mr. D. L. Aswell Vice President, Power Production Louisiana Power & Light Company 142 Delaronde Street New Orleans, Louisiana 70174 W. Malcolm Stevenson, Esq.
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Monroe & Lemann 1424 Whitney Building New Orleans, Louisiana 70130
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Mr. E. Blake Shaw, Pittman, Potts and Trowbridge 1800 M Street, N. W.
Washington, D. C.
20036 Mr. D. B. Lester Production Engineer Louisiana Power & Light Company 142 Delaronde Street New Orleans, Louisiana 70174 Lyman L. Jones, Jr., Esq.
Gillespie & Jones 910 Security Homestead Su'Iding 4900 Veterans Memorici Boulevard Metairie, Louisiana 70002 Luke Fontana, Esq.
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Gillespie & Jones i
824 Esplanade Avenue New Orleans, Louisiana 70116 Stephen M. Irving, Esq.
One American Place, Suite 1601 m. Baton Rouge, Louisiana 70825
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Louisiana Office of Conservation ATTN: Administrator Nuclear Energy Division P. O. Box _14690
. ;,' Baton Rouge, Louisiana 70808 President, Police Jury St. Charles Parrish Hahnville, Louisiana 70057 U. S. Environmental Protection Agency
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' Region VI Office S* r 1201 Elm Street First International Building
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Dallas, Texas 75270
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.,e ENCLOSURE TO ALL APPLICANTS:
Due 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 mimimum verify the following:
(1) There are no visible signs of damage or impaired operability as a result of storage, handling, 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 jammed.
1 (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.
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 intervals. Any discrepencies or inconsistencies shall be evaluated for cause and corrected prior to proceeding +4 the next specified interval.
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The above described operability program for snubbers should be. included
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- 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 taermal motion. This test program should be specified in Chapter 14 of the FSAR.
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