ML19210B610
| ML19210B610 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point, Crane  |
| Issue date: | 12/10/1971 |
| From: | James O'Reilly US ATOMIC ENERGY COMMISSION (AEC) |
| To: | John Miller METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7911110086 | |
| Download: ML19210B610 (3) | |
Text
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UNITED STATES
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' 93 ATOMIC ENEP.GY COMMIS IN
- # N DIVISION OF COMPLIAr:CE 2o1 643
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Metropolitan Edison Cer.pany Docket Nos. 50-239 Attention: !!r. J. G. Miller Vice President 59-320 P.O. Ec:t 542 Readin3, Pennsylvania 19603 Gentic :en:
Uc recently rc cived infornation fron the Florida Pouer & Lf;ht Coupany concernin3.cn occurren::e durin; preoperational testin; of t?te Turkey Point 3 pressuri::cd vatar reactor which may relato to the perforuance of steaa line pressure relief valve headers in your facility.
This letter providea you vith a copy of the body of a ecle:;ran sent to all operating reactors by cognizant Ite;ional Offices of the Division of Complianec.
For your reactors which are not yet licenacd to operate, no response to this letter is required oC you. We will review this m tter durin; our continuin; inspection pro;;rua.
Should you '.uve any questions concerning this aatter, we will be pleaced to discuas then wit:t you.
Very truly youro, Jancs P. O'Reilly Director Enclo:ure:
Eody of Telegraa bec:
A. Giambusso, CO L. Kornblith, C0 R. Engelken, C0 J. G. Keppler, C0 J. B. Henderson, C0(5)
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ENCLOSURE BODY OF TELEGRAM TO LICENSEES OF OPERATING POWER REACTORS WE RECENTLY RECEIVED INFORMATION FROM THE FLORIDA POWER & LIGHT COMPANY OF-AN OCC?
CE DURING PREOPERATIONAL TESTING OF THE TURKEY POINT 3 (W)
PRESSURIZED WATER REACTOR THAT MAY RELATE TO PERFOR!ANCE OF THE STEAM SUPPLY SYSTEM AT YOUR FACILITY.
THE INF0DIATION IS AS FOLIOWS:
DURING HOT FUNCTIONAL TESTING OF THE UNFUELED REACTOR, THREE OF FOUR RELIEF VALVES WERE CATASTROPHICALLY EJECTED FROM TWO MAIN STEAM LINE HEADERS TO WHICH THEY WERE MOUNTED. THE FAILED HEADERS WERE 12-INCE DIAMETER, SPOOL PIECES FABRICATED BY THE DRAVO CORPORATION, MARIETTA, OHIO FROM SCHEDULED 60 (.562-INCH WALL THICKNESS] A106 GRADE B CARBON STEEL PIPE MANUFACTURED BY U.S. STEEL, LORAIN WORKS, LORAIN, OHIO, MOUNTED HORIZONTALLY 180* FROM EACR OTHER ON THE TWO SIDES OF THE ~MAI,N STEAM LINE. THE HEADERS WERE HYDR 0 STATICALLY TESTED AT 1356 PSIG UNDER COLD CONDITIONS PRIOR TO HOT FUNCTIONAL TESTING.
ON ONE SIDE OF THE MAIN STEAM LINE, THE FAILURE OCCURRED IN THE VICINITY OF THE HEAT-AFFECTED ZONE OF THE WELD WHICH JOINS THE RISER TO THE HEADER AND APPEARS TO BE LARGELY CONFINED TO THE 12-INCH HEADER. ON THE OTHER SIDE OF THE MAIN STEAM LINE, THE FAILURE APPARENTLY ORIGINATED IN A SD!ILAR MANNER AND PROPAGATED THROUGH THE PIPE HEADER CAUSING CATASTROPHIC DAMAGE TO THE HEADER ASSEMBLY.
THE SECONDARY SYSTEM WAS AT 990 PSIG AND 545'F AND THE PRIMARY SYSTEM AT 2232 PSIG AND 546.6*F AT THE TIME OF THE HEADER FAILURE. THESE SYSTEMS HAD BEEN AT THEIR RESPECTIVE PRESSURES AND TEMPERATURES FOR NINE DAYS, NO TRANSIENT CONDITIONS WERE REPORTED TO 1588 006
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HAVE EXISfED IN THESE SYSTDIS AT THE TIME OF FAILURE.
THE FAILED HEADER ASSDIBLIES EACH CONSISTS OF TWO VALVES MOUNTED VERTICALLY IN A DEAD-END 12-INCH DADIETER PIPE PROJECTING AT A 90* HORIZONTAL ANGLE FROM THE MAIN STEAM LINE. THE TWO HEADERS ARE MOUNTED AT 180* TO EAC'd OTHER ON THE OPPOSITE SIDES OF THE MAIN STEAM LINE.
THE HEADERS WERE DESIGNED TO MEET SECTION I 0F THE ASME CODE BY THE BECRTEL CORP 0PXJION.
FOR YOUR REACTORS WHICH ARE LICENSED TO OPERATE, IT IS REQUESTED THAT YOU PROVIDE THIS OFFICE WITHIN TEN DAYS, IN WRITING, AS TO WHETHER HEADERS AS DESCRIBED ABOVE WERE INSTALLED IN THE STEAM LINES OF YOUR FACILITY.
SHOULD YOU HAVE ANY QUESTIONS CONCERNING THIS MATTER, WE WILL DISCUSS THDI WITH YOU.
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