A05243, Discusses Error in Item 4 of Insp Repts 50-245/85-22 & 50-336/85-27.Sentence Should Read One Line (383) Lost Due to Tree Impingement While Other Line (348) Lost Due to Spurious Overcurrent Trip

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Discusses Error in Item 4 of Insp Repts 50-245/85-22 & 50-336/85-27.Sentence Should Read One Line (383) Lost Due to Tree Impingement While Other Line (348) Lost Due to Spurious Overcurrent Trip
ML20203F080
Person / Time
Site: Millstone  Dominion icon.png
Issue date: 04/11/1986
From: Opeka J
NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To: Wenzinger E
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
A05243, A5243, B12052, NUDOCS 8604250011
Download: ML20203F080 (2)


Text

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General Offices

a os '<a == c"*' P.O. BOX 270 H ARTFORD. CONNECTICUT 06141-0270 k L J Z',[,$[,C~ (203) 66s-5000 April 11,1986 Docket No. 50-245 A05243

[} B12052

" Mr. Edward C. Wenzinger, Chief Projects Branch No. 3 Division of Reactor Projects Region 1

U.S. Nuclear Regulatory Commission p

631 Park Avenue King of Prussia, PA 19406

? Gentlemen:

,- Millstone Nuclear Power Station, Unit No.1 Inspection 50-245/85-22; 50-336/85-27 f In the NRC Region I Inspection Report 50-245/85-22; 50-336/85-27 (l) an

,_ incident that occurred on August 9,1985 in which both Millstone Unit Nos. I and 2 conducted rapid load reductions due to offsite transmission line disturbances E was discussed. Specifically, the response to the loss of two out of three

- 345,000 volt transmission lines linking the Millstone switchyard with the balance of the grid was reviewed.

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The purpose of this letter is to call to your attention an error in the third sentence in item 44 of the report. The sentence should read "One line (4383) was lost due to tree impingement while the other line (h348) was lost due to a spurious overcurrent trip." The scenario described in the inspection report lef t

the 4348 line as the only line in service. An automatic load reject of Millstone Unit No. I would have occurred if station generation had exceeded 1200 W on 7 the h348 line, as stated in our April 6,1981 letter to D. M. Crutchfield. 2 An automatic load reject did not occur since the #371 line was in service and

,_ capable of carrying station output in excess of 1200 MW.

F c.

(I) E. C. letter to 3. F. Opeka, Inspection 50-245/85-22; 50-336/85-27Wenzing(er July 23, 1985 September 3, 1985),

dated

September 12,1985.

(2)

W. G. Counsil letter to D. M. Crutchfield, Millstone Nuclear Power Station, Unit No.1, SEP Topics V-10.B, V-II.A, V-11.B, Vll-3 and IX-3; Safe Shutdown Systems, dated April 6,1981.

8604250011 860411 PDR ADOCK 00000245 ,

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if you have any questions on this issue, please feel free to contact my staff. .

Very truly yours, NORTHEAST NUCLEAR ENERG COMPANY Y f CGA-J. F. OpekW O Senior Vice President l

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