ML19320D557

Interim Deficiency Rept Confirming 800515 Telcon. Westinghouse Centrifugal Charging Pumps May Not Deliver Min Flow at Valve Set Point Pressure.Action Will Be Delayed Until Westinghouse Analysis Completed

ML19320D557
Person / Time
Site:	Millstone
Issue date:	06/14/1980
From:	Counsil W NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML19320D517	List: ML19320D557
References
AEC-MP3-210, B10018, NUDOCS 8007210520
Download: ML19320D557 (1)

Text

. . . . - _ _ _ _ - _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

.. . V C)

NNE?CO ,o _ m C3 666 69 1 NORTHEAST NUCLEAR ENERGY COMPANY A NORTHEAST UTILITIES COMPANY

.. June 14, 1980 Docket No. 50-423 AEC-MP3-210 B10018 Mr. B. H. Grier, Director United States Nuclear Regulatory Commission Office of Inspection & Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Gentlemen:

Millstone Unit No. 3 Reporting Of Deficiencies in Design and Construction This letter provides written confirmation of a phone conversation held with your Mr. McGaughy on May. 15, 1980. We have determined that the' problem as discussed below is reportable under 10 CFR 50.55(e)(1)(ii).

As reported to Mr. McGaughy on May 15, 1980, our Nuclear Steam Supply System Supplier.for Millstone Unit No. 3 Westinghous'e Electric Corporation, reported to Northeast Nuclear Energy Company that following'a secondary system high energy line rupture the centrifugal charging pumps may not be capable of delivering their minimum required flow to the reactor coolant system at pressurizer safety valve set point pressure. Minimum pump flow is required to ensure proper pump coolant and thereby prevent pump damage due to over-heating.

Since Millstone Unit No. 3 is currently under construction, Northeast Nuclear Energy Company intends to delay action on this item pending the outcome of additional plant specific analyses presently being performed by Westinghouse Electric Corporation.

Very truly yours ,

NORTHEAST NUCLEAR ENERGY COMPANY

/

W. G. Counsil Sr. Vice President cc: Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D.C. 20555 8 0 0 7 21 O f2. 0