ML19281A281
| ML19281A281 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 02/14/1979 |
| From: | Groce R Maine Yankee |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WMY-79-10, NUDOCS 7903090277 | |
| Download: ML19281A281 (2) | |
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- g B.3.2.1 kMY 79-10 February 14, 1979 United States Nuclear Regulatory Cocmission k'a shing t on, D. C. 20555 Attention
- Office of Nuclear Reactor Regulation
References:
(a) Licer.se No. DPR-36 (Docket 50-309)
(b) USNRC letter dated May 17, 1978 (c) Maine Yankee letter to USNRC, kMY 78-56 dated June 5, 1978
Dear Sir:
Subject:
Pipe Cracks in Chemical Volume Control Due to Excessive Charging Putp Vibrations Reference (b) requested Maine Yankee to inform the USFRC of certain information relative to operation of positive displace =ent charging pumps.
k' hen ref erence (c) was subnitted, it was intended to indicate that the positive displacement charging pump at Maine Yankee was not used during normal operation; however, through an oversight en our part, it was reported that Maine Yankee did not have positive displacement charging pumps.
In order to clarify the inforcation previously submitted in reference (c) and in compliance with a request made in a telecon held on January 17, 1978, between Mr. Diianni of NRC DOR and Mr. R. H. Groce of YAEC, the following information is provided.
A review of plant records indicates that our positive displacement auxiliary charging pump has operated for a total of approximately 35 hours4.050926e-4 days <br />0.00972 hours <br />5.787037e-5 weeks <br />1.33175e-5 months <br /> cince the plant was completed in late 1972.
Furposes for which the pucp has been used are as follows:
(1) Primary plant hydrostatic testing.
(2) Strong boric acid injection (to establish refueling boron concentration in RCS).
(3) Recirculation of liquid in safety injection system lines for boron concentration verification.
(4)
Injection of chemicals into RCS for chemical cleaning purposes.
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United States Nuclear Regulatory Cottission February 14, 1979 Page 2 Recirculation of the liquid in the <nfety injection lines utilizes piping that is also used for the citigation of accidents (safety injection).
Of the above listed operations, this is the only use which would occur during power operation. Recirculation of the liquid in the safety injection lines is normally accomplished during shutdowns, prior to starting up.
It is not anticipated that the recirculation will be needed during power operation.
In the event that it is however, we estinate that the total hours that the auxiliary charging pump will discharge into the safety injection lines will not exceed 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> per year.
During the approximately 35 hours4.050926e-4 days <br />0.00972 hours <br />5.787037e-5 weeks <br />1.33175e-5 months <br /> that the auxiliary charging pump has operated, no downstream vibrations have been observed.
Because of the very limited service which this pump has seen in the past and is projected to see in the future, Maine Yankee does not feel that any vibratory load associated with its operation should be of concern.
We trust that this information is satisfactory. However, should additional information be required, please contact us.
Very truly yours, MAINE YANKEE ATOMIC POWER COMPANY Robert H. Groce Licensing Engineer
.