ML20148G369
| ML20148G369 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 04/17/1975 |
| From: | Vandenburgh D YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8011110562 | |
| Download: ML20148G369 (4) | |
Text
proporsd Changa No. 120
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P0OR QUAUTY PAGES Telephone 6l7 366-90ll
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- F10 390 0739 YANKEE ATdMIC ELECTRIC COMPANY m a 's-<s
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fQ 20 Turnpike Road Westborough, Massachusetts 01581
- h xus April 17, 1975
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United States Nuclear Regulatory Commission f
Washington, D. C.
20555
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Attention: Office of Nuclear Reactor Regulation
Reference:
1.
License No. DPR-3 (Docket No. 50-29) 2.
Proposed Change No. 120 submitted January 13, 1975 3.
Letter from NRC dated March 19, 1975 4.
Supplement No. 3'to Proposed Change No. 96 submitted March 20, 1972 P
Dear Sir:
pursuant to Section 50.59 of the Commission's Rules and Regulations and. ycur request for additional information regarding Reference 2, the Yankee Atomic Electric Company hereby submits the following Supplement No.
1 te sference 2.
Ycur approval of Change No. 97 on April 14, 1972, was based on i.fe ration submitted relative to the operation of the low main coolant flew trip using relays to monitor the electric current to each main coolant The bases fer the selection of the high and low current setpoints pu p.
were given in Reference 4, Attachment B, " Additional Information on Frep sed Instrumentation and Electrical System Revisions." The following is an excerpt frem the answer to Question B.5 in Attachment B:
"The low main coolant flow scram is initiated by monitoring the current to each of the four main coolant pumps.
When pump current is below normal current, a loss of flow due to loss of pump driving power supply is indicatedt and when the current is above nc mal, a loss of flow is anticipated due to a pump mechanical seizure or a motor fault."
1 The low setpoint senses loss of pump driving power supply by sensing The j
the decreasing current which occurs due to loss of power to the pump.
high setpoint will sense increasing pump current due to pump mechanical seicure or a motor fault before the locked rotor current of 2150 amperes is reached and before the motor protective relays operate. Therefore, the i
setpcint ampere values are not critical and must only detect high or low current indicative of loss of power supply or pump mechanical soiture.
With this type of anticipatory trip, it is not necessary to correlate actual f*cw to pump current.
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Unitad Statas Nucledr1Rtgulatory, Commission-April 17,-1975 i
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- Attni. Office of Nuclear'DeactorLRegulation Page Two-i l
' Referring to the attached pump performance curve'for the hoticondition, othe normal. pump-current is.approximately 380 amperes'.. Originally, the
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setpoint below normal current was selected'to be 300' amperes,'or approximate 1y'
- no,loadfeurrent, equivalent to about'5% normal flow; and the setpoint above~
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normal; current was. selected to be 576 amperes.
In'1973, however,.the plant experienced spurious low flow trips due tx)' electrically induced surges of.
very short' duration caused'by lightning-strikes on.the external transmission system. At that' time, the high and low setpoints were changed to prevent y
these spurious trips. -The, low setpoint was reduced.to 240 amperes in June, I
j 1973, and the'high setpoint.was raised to 920 amperes in August, 1973.
du Since the protective. function'is an anticipatory. trip and is monitoring
[
t for flow or no flow conditions ~ no allowances are required in the setpoint I
ampere values to account for' anticipated decrease of the efficiencies of the coolant pump-motor combination with the passage of time.
We trust that this supplementary information is sufficient to enable J'
you to approve our Proposed Change No. 120.-
Respectfully submitted, YANKEE ATOMIC ELECTRIC COMPANY J
D..E. Vandenburgh Vice President-f
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COMMONWEALTH OF MASSACHUSETTS)
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' COUNTY OF WOP.CESTER
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Then personally appeared before me, D. E. Vandenburgh, who, being duly sworn, did state that he is Vice President of Yankee Atomic Electric Company, that he is duly authorized to execute and file the foregoing request in the name and on behalf of Yankee Atomic Electric Company and that the statements therein are true to the best of his knowledge and belief.
A x
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Armand R. Soucy Notary Public My Commission' Expires September 9, 1977
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FROM: Yankee Atomic-Elec. Co.
DATE OF DOC DATE REC'D, LTR TWX RPT OTHERl
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CLASS UNCLASS PROP.lNFO INPUT NO CYS REC'D DOCKET NO:
XXX 40 50-29
. DESCRIPTION:
Ltr not'arized 4-17-75 requesting ENCLOSURES:
Supple, ment #1, to Proposed pursuant to Sect. 50 59 'aupl #1 to' Proposed Change No. 120 re low main coolant flo Change No.120 & trahs the follotfin6:
trip using relays' to 'mopitor the elect i
current to. e'ach,zr.rt ma'in doolant pump.d
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