ML20028A475
| ML20028A475 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/18/1982 |
| From: | James Shea Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| IEB-80-13, LSO5-82-11-058, LSO5-82-11-58, NUDOCS 8211220213 | |
| Download: ML20028A475 (4) | |
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November 18, 1982 Docket !!o. 50-245 LS05-82-ll-058 LICEllSEE: il0RTHEAST tlUCLEAR EllERGY COMPAllY FACILITY: Millstone Nuclear Power Station, Unit Ho 1
SUBJECT:
SUff1ARY OF THE OCTOBER 29, 1982 HEETING - CORE SPRAY SPARGER CRACV, REPAIR
!!RC and NiiEC0 representatives met in the NRC Bethesda, !!aryland office on October 29, 1982 to review the visual inspection results, using an 4(
underwater TV camera, of _the low pressure emergency core spraty sparger including detailed observations of a crack in the sparger and the resultant necessary actions.
Visual inspections were perfomed per I&E Bulletin 80-13, disclosing a significant crack near the sparger-to-junction box "D'? welds. The licensee has installed a clamp at this location to prevent further degradation and ensure that the core spray system will continue to pro-vide the required core spray cooling capability.
The staff evaluated the infomation presented by NNECO and concluded that the actions were acceptable.
The bases for our conclusion are:
1.
Confimation that the inspection perfomed using high resolution TV cancra revealed no other cracks.
2.
The clamp at the crack location is designed to hold pu the sparger and junction box together, with negligible separation at the crack location, thus maintaining proper function of the spargers.
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3.
The mechanical design of the clamp is in accordance with requirements of ASME III, Subsection NF. The calculations conservatively assume that the pipe is completely severed at the location of the crack.
4.
The clamped area will be inspected at the next refueling outage to confim that the clamp is still perfoming its function, to check for any further crack progression and to detemine if additional cracks have occurred.
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Clamps of identical or similar design have been installed on Oyster Creek, Vemont Yankee, and Peach Bottom. Repetetive examinations of the clamped area at Oyster Creek have confirmed that the clamp has remained functional, and no further sparger pipe degradation has occurred.
The staff concluded that !!NECO actions to prevent degradation of the core spray system are satisfactory, and that the inspection planned for the next refueling outage will provide assurance that the system will remain coupletely operational.
The list of necting attendees is enclosed.
Original signed by James J. Shea, Project !!anager Operating Reactors Branch #5 Division of Licensing
Enclosure:
List of attendecs cc u/ enclosure:
See next page
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2 Mr. W. G. Counsil CC William H. Cuddy, Esquire State of Connecticut Day, Berry & Howard Office of Policy & Management Counselors at Law ATTN:
Under Secretary Energy I-One Constitution Plaza Division Hartford, Connecticut 06103 80 Washington Street i
Hartford, Connecticut 06115 Ronald C. Haynes, Regional l
Administrator Nuclear Regulatory Commission
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Region I Office 631 Park Avenue King of Prussia, Pennsylvania 19406 Northeast Nuclear Energy Company ATTN:
Superintendent Millstone Plant P. O. Box 128 Waterford, Connecticut 06385 I
i Mr. Richard T. Laudenat j
Manager, Generation Facilities Licensing
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Northeast Utilities Service Company 1
P. O. Box 270 Hartford, Connecticut 06101 Resident Inspector c/o U. S. NRC P. O. Box Drawer KK Niantic, Connecticut 06357 i
First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 John F. Opeka Systems Superintendent Northeast Utilities Service Company
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P. O. Box 270 Hartford, Connecticut 06101
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U. S. Environmental Protection Agency Region I Office ATTN:
Regional Radiation Representative _
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JFK Federal Building Boston, Massachusetts 02203 L
. ENCLOSURE o
LIST OF ATTENDEES Meeting of October 29, 1982 ECCS SPRAY SPARGER CRACKS NAME AFFILIATION I
i J. Shea NRC J. F. Ely NUSCO s; i
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M. Kupinski NUSCO G. Sullivan NUSCO R. Palmieri NNECO M. Hills NUSCO M. McCoy NRC k
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G. Thomas NRC
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K. D. Desai NRC wr -
P. A. Blasioli NUSCO M. Ahern NUSCO H. Shaw NRC D. Clark NRC D. Crutchfield NRC-B.D. Liaw NRC H.F. Conrad NRC L. Connor The NRC Calendar W. Hazelton NRC C. Y. Cheng NRC
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