ML20085A464

Advises of follow-up Program to Determine Cause of Graham Heliflow Letdown Coolers Failure & Possible Repair Methods for Leaking Coolers.Parallel Operation of Both Cooler Units Recommended

ML20085A464
Person / Time
Site:	Three Mile Island
Issue date:	04/07/1977
From:	Rogers L BABCOCK & WILCOX CO.
To:	Colitz J, Herbein J, Geoffrey Miller METROPOLITAN EDISON CO.
References
TASK-*, TASK-03, TASK-3, TASK-GB GPU-0391, GPU-391, REM-I-315, REM-II-30, NUDOCS 8307060510
Download: ML20085A464 (2)

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.c. Babcock &Wilcox _ _ _ _ . __

- P.O. Ba l260. Lynchburg. Va.24505 * .

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April T, 1977. *

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Mr.,J. G. Herbein

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• Manager, Generation Operations-Nuclear. .

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Hetropolitan L11 son Company .'

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,. Mr. J. J. Colitz -

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Metropolitan Liison Conpany *-

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Superfntendent, Unit II

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Subject:

. Grahan Heliflow Letdown Coolers *. -

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ij Gentlemen: ..,..

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There have been several occurrences of failures of the subject c,oolers at *.. : .,.. ; . i

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' operating;5W plantsi. The specific causes of these failures are not clearly. -

-i f identified at this ti=e. BW is involved in a follow-up proGran to determine .

' the causes of the failures as well as possible repair nethces for th'e. leaking

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i coolers. You vill be advised of the prog: ess in BW's evaluation program .i A

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as infor=ation is developed. -

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!/ In the- interin period, it is reccramended that Het-Ed ad GPU, as appropriate. .* 77. . i-L

$ . operate both cooler units in parallel whenever possible. This action vill '. .

. '.; reduce the number as well as the severity of ther:n1 transier.ts that would ,' '.

normally *oe encountered whenever placing the standby cooler in service.. If l the installed cooling vater. systes cannot seco=odate both coolers operating . .

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( f.7 in parallel, then operate one cooler continuously. Should a need arise to i*

• place the standby cooler in service, the reactor coolant should be admitted . .

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slowly in order to nin'-f:e the resultant thernal transient.

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. . . . *i'est procedures and operating it.structior.s can be modified to accomplish p-l . '

, the above suggested opera *.ing methods. .. .

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c.,,. .. , If you have any further questions, plesse do at hesitate to contact me. .. .

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Very truly yours . ,.

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