ML20137A824

From kanterella
Jump to navigation Jump to search
Advises That Pump Trip Criterion Revised to Require Tripping of Reactor Coolant Pumps W/Rcs Subcooling Equal to or Less than 25 F.Procedures Being Changed to Reflect Revised Criterion
ML20137A824
Person / Time
Site: Maine Yankee
Issue date: 11/20/1985
From: Whittier G
Maine Yankee
To: Butcher E
Office of Nuclear Reactor Regulation
References
6516L-GDW, GDW-85-268, MN-85-183, NUDOCS 8511260110
Download: ML20137A824 (1)


Text

__

MAIRE HARHEE MOMICPOWERCOMPARUe suaugr,Kain"g%

3 (kf November 20, 1985 (207) 623-3521 9 m-85-183 GDW-85-268 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Mr. Edward J. Butcher, Jr.

Acting Branch Chief Operating Reactors Branch No. 3 Division of Licensing

References:

(a) License No. DPR-36 (Docket No. 50-309)

(b) USNRC Letter to MYAPCo dated August 17, '985 (c) MYAPCo Letter to USNRC dated September 25, 1984 (MN-85-160)

(d) MYAPCo Letter to USNRC dated January 18,1985 (IH-85-13)

(e) USNRC Letter to MYAPCo dated January 29, 1985 (f) WAPCo Letter to USNRC dated January 31, 1985 (MN-85-20)

(g) MYAPCo Letter to USNRC dated May 28, 1985 (MN-85-96)

(h) MYAPCo Letter to USNRC dated June 28,1985 (bN-85-125)

Subject:

Reactor Coolant Pump Trip Criteria Gentlemen:

The purpose of this letter is to clarify the reactor coolant pump trip criterion which is in effect at Maine Yankee. In the past, Maine Yankee procedures have required tripping reactor coolant pumps upon initiation of safety injection. It has become apparent that this criterion may not be the optimal strategy for all situations. Accordingly, we have developed a revised pump trip criterion which requires the tripping of the reactor coolant pumps with reactor coolant system subcooling equal to or less than 250F. We are currently changing our procedures to reflect the revised pump trip criterion.

Please call me if you have any questions'in this matter.

Very truly yours, MAINE YANKEE ATOMIC POWER C0bPANY 05112 {gjhD 09 k DR PDR G. D. Whittier, Manager Nuclear Engineering & Licensing GDW/bjp cc: Dr. Thomas E. Muric/ [

Mr. Cornelius F. Holden pl l

1(9 6516L-GDW