ML19257C288

Submits Results of Review of Operating Records of 48-h Endurance Test on Auxiliary Feedwater Pumps,In Response to short-term Recommendations of NRC 791011 & 22 Ltrs.Intent of Recommendation Fulfilled

ML19257C288
Person / Time
Site:	Haddam Neck, Millstone  File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	01/17/1980
From:	Counsil W, Willie Lee NORTHEAST UTILITIES
To:	Eisenhut D Office of Nuclear Reactor Regulation
References
TAC-42410, NUDOCS 8001250519
Download: ML19257C288 (2)

Text

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t a '".l::TC. ::L ' "r January 17, 1980 Docket Nos. 50-213 50-336 Darrell G. Eisenhut, Acting Director Division of Operating Reactors Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Ref erences:

(1)

D. G. Eisenhut letter to D. C. Switzer dated October 11, 1979.

(2)

D. G. Eisenhut letter to W. G. Counsil dated October 22, 1979.

(3)

W. G. Counsil letter to D. G. Eiscahut dated December 4,1979.

(4)

W. G. Counsil letter to D. G. Eisenhut dated November 28, 1979.

(5)

W. C. Counsil letter to R. Reid dated August 22, 1979.

Gentlemen:

Haddam Neck Plant Millstone Nuclear Power Station, Unit No. 2 Auxiliary Feedwater Systems In References (1) and (2), Connecticut Yankee Atomic Power Company (CYAPCO) and Northeast Nuclear Energy Company (NNECO) were requested to review the Haddam Neck Plant and Millstone Unit No. 2 against the applicable requirements of Enclosure (1) of References (1) and (2) to determine the current degree of conformance.

Itemized responses to t i requests were provided in References (3) and (4) for CYAPCO and n. SCO, respectively.

One of the additional short-term recommendations of References (1) and (2) was that each licensee perform a 72-hour endurance test on all AFW pumps, if such a test or continuous period of operation has not been accomplished to date.

In subsequent telephonc discussions, the Staf f advised that the recommended minimum duration of the test was revised to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, rather than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

In References (3) and (4), CYAPCO and NNECO advised that operating records and history were being reviewed, such that the appropriateness of such tests could be determined. This review has been completed, and the conclusions reached are as follows.

1809.330 8001250 dII7 P

e Millstone Unit No. 2 For Millstone Unit No. 2, NNECO retains run-time logs for plant equipment for only one calendar year.

These records were reviewed for the calendar year 1979 and maximum periods of operation were identified as tollows:

Pump Date Hours (1)

"A" Auxiliary Feedwater 5/18 - 5/19 27.5 (2)

"B" Auxiliary Feedwater 5/18 - 5/19 43.5 (3) Terry Turbine 6/15 - 6/19 96.0 Typical plant evolutions requiring the use of the auxiliary feedwater pumps were described in Reference (5).

In general, the electrically driven pumps are the preferred source to support these evolutions. Although documentation regarding motor-driven pump operation prior to 1979 cannot be provided, their use over the life of the plant has been extensive.

Therefore, NNECO has concluded that the intent of this recommendation has been fulfilled, and that supplemental endurance tests would be superfluous.

Haddam Neck Plant Documentation analogous to that described above for Millstone Unit No. 2 is not available at the Haddam Neck Plant, regarding the two steam-driven auxiliary feedwater pumps.

Plant evolutions requiring the use of these pumps is similar to that discussed in Reference (5). A typical startup from a refueling shutdown would include rod-drop tests and low power physics testing. This evolution involves the operation of the auxiliary feedwater pumps for a period of four-to-five days.

Pwsp operation is normally evenly divided between the two such that the endurance capability of each pump is well established.

Routine surveillance tests are also performed monthly.

During the life of the facility, these pumps have been operated for extended periods without identification of any deleterious ef fects attributable in long-term operation. Therefore, CYAPCO has concluded that the intent of this recommendation has been fulfilled, and that supplemental endurance tests would be superfluous.

We trust you find the above information responsive to your request.

Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPANY NORTHEAST NUCLEAR ENERGY COMPANY o

a W. G. Mounsil Vice President By:

W. F. Fee Vice President 1809 331