ML20003C026
| ML20003C026 | |
| Person / Time | |
|---|---|
| Site: | Mcguire |
| Issue date: | 02/17/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 8102260469 | |
| Download: ML20003C026 (4) | |
Text
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%j UNITED ::TATEs E
NUCLEAR REGULATORY COMMISSION
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. e WASHINGTON. O. C. 20555 s
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FEB 1 T 1981 g8 I9 f4k.
Docket No. 50-370 e,
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g Duke Pcwer Company j8 ATTN: Mr. Willian 0. Parker, Jr.
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/gO p7 Vice President - Steam Production (k
/g S P. O. Box 33189 422 South Church Street 4
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Charlotte, North Carolina 28242
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Dear Mr. Parker:
SUBJECT:
PRESERVICE INSPECTION AND TESTING OF SNUBBERS - MCGUIRE NUCLEAR STATION, UNIT 2 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 require-ments to insure snubber operability be implemented at the McGuire Nuclear Station, Unit 2.
Sincerely, A &.y Robert L. Tedesco, Assistant Director for Licensing Division of Licensing
Enclosure:
As stated cc w/ enclosure:
See next page a
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Mr. William O. Parker, Jr.
Vice President, Steam Production Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 cc: Mr. W. L. Porter Duke Power Company Dr. Cadet H. Hand. Jr.. Directar P. O. Box 2173 Bodega Marine Lab of California 422 South Chu/ch Street P. O. Box 247 Bodega Bay, California 94923 Charlotte, Notth Carolina 28242 Mr. R. S. Howard Richard P. Wilson, Esc.
Power Systems Division Assistant Attorney General State of South Carolina Westinghouse Electric Corporation 2600 Bull Street P. O. Box 355 Columbia, South Carolina 29201 Pittsburgh, Pennsylvania 15220 Mr. E. J. Keith Office of Intergovernmental Relations EDS Nuclear Incorporated 116 West Jones Street Raleigh, Nortn Carolina 27603 220 Montgomery Street San Francisco, California 94104 County Manager of Mecklenburg County 720 East Fourth Street Mr. J. E. Houghtaling Charlotte, North Carolina 28202 NUS Corporation 2536 Countryside Boulevard U. S. Environment-1 :)rotection Acency Clearwater, Florida 33515 ATTN: EIS Coordir,3 tor Region IV Office Mr. Jesse L. Riley, President ~
345 Courtland Street. N. !!.
The Carolina Environmental Study Grcup Atlanta, Georgia 30308 854 Henley Place Charlotte, North Carolina 28207 Mr. Tom Donat Resident Insoector McGuire NPS J. Michael McGarry, III, Esq.
c/o USNRC Debevoise & Liberman-Post Office Box 216 1200 Seventeenth Street, N. W.
Cornelius, North Carolina 28031 Washington, D. C.
20036 Shelly Blum, Esquire Rober t M.' Lazo, Esq., Chairman 1402 Vickers Avenue Atomic Safety and Licensing Board Durham, North Carolina 27707 U. S. Nuclear Regulatory Comission Washington, 0. C.
20555
- Or. Emeth A. Luebke Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555
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TO ALL APPLICANTS:
Due to a long history of proolems dealing with inoperable and incorrectly installed snubbers, and due to the potenttal safety :ignificance of failed snubbers in safety related systems and components, it is requested that maintenance records for snubbers be documented at. follows:
Pre-service Exanination A pre-service examination should be made on all snubbers listed in tables 3.7 4a and 3.7-4b of Standard Tev.nical Specifications 3/4.7.g this exami-nation should be made after snuober installaticn.but not more than six months prior to initial system pre-operational testing, and should as a simimum verify the following:
(1) There are no visible signs of damage or imcaired operatility as a result of storage, handling, or installation.
(2) The snubber location, orientation, position setting, and configuration (a'ctachments, extensions, etc.) are according to design drawings and specifictions.
(3) Snubbers are not sei:ed, frozen or jamed.
(4) Adequate swing clearance is provided to allow snubber movement.
(5) If applicable, fluid is to the recomended 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 excaeds six months due to unexpected situations, re-examination of items 1,4, and 5 shall be performed. Snubbers which are installed incor ectly or otherwise fail to meet the above requirements must be repaired op replaced and re-examined in accordance with the above criteria.
Pre-Operational Testing During pre-operational testing, snubber thermal movements for systems wnose operating temperature exceeds 250* F should be verified as follows:
(a) During initial system heatup and cooldown, at specified temoerature intervals for any system which attains operating temperature, verify the snubber expected thermal movement.
I (b) For those systems which do not attain operating temperature, verify via observation and/or calculation that the snubber will accomodate the projected thermal movement.
(c) Verify the snubber swing clearance at specified heatup aad cooldown interval s. Any discrepencies or inconsistencies s~ hall be evaluated for cause and corrected prior to proceeding to the next specifitd interval.
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2-r The above described operability program for snubbers saculd be incluced and documented by the ;re-service inspection and pre-o;erational test programs.
The pre-service inspection mus: be a prerequisite for the pre-operational testing of snubber thermal motion. This test program should be specified in Chapter 14 of the FSAR.
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