L-81-515, Responds to IE Bulletin 81-02 Suppl 1, Failure of Gate-Type Valves to Close Against Differential Pressure. One 4-inch Electro-Mechanical Div Valve Will Close Against Differential Pressure Higher than That Anticipated
| ML20040C325 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 12/07/1981 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-SSINS-6820 IEB-81-02, IEB-81-2, L-81-515, NUDOCS 8201270531 | |
| Download: ML20040C325 (2) | |
Text
P O. BOX 529100 MI AMI, FL 33152
.,o FLORIDA POWEH & LIGHT COMPANY December 7, 1981 L-81-515 Mr. James P. O'Reilly, e
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Regional Administrator, Region II sg U. S. Nuclear Regulatory Commission i
101 Marietta Street, Suite 3100 gggg Atlanta, Georgia 30303 S
2 JAN 261982* r agueuf #
Dear Mr. O'Reilly:
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Re: RII:JP0 4
50-335 IE Bul letin 81-02, pplement (4
N As indicated in our letter (L-81-432) dated October 5,1981, we have reviewed the supplement to IE Bulletin 81-02 (Failure of Gate Type Valves to Close Against Dif ferential Pressure). We have determined that at St. Lucie Unit 1 there is one 4-inch W-EMD valve (V-2525) in the Chemical and Volume Control system.
This valve Ts the blending tee Volume Control Tank bypass litie.
isolation valve. It is in a line used to change the boron concentration in the charging pump suction line and it is actuated to close on initiation of safety injection.
The valve is operated daily to change the boron concentration in the reactor coolant, and it has never failed to close against the operating ditterential pressure. This valve is normally closed.
It is our engineering judgment that the maximum differential pressure at which this valve would be required to close is considerably less than 100 psig. Westinghouse has stated that this model valve will close against a 100 psig differential.
Because of the past perforraance record of this valve, the vendor's statement on the valve's ability to close against a differential pressure higher than that anticipated in its service condition, and because valve tailure has negligible safety consequences, no corrective action is considered necessary.
Very truly yours, c/&.
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I Robert E. Uhrig Vice President Advanced Systems & Technology REU/PLP/ ras cc: Director, Of fice of Inspection anc fnforcement Harold F. Reis, Esquire h$k3co O!00$035 I I/[,
PDR PEOPLE,. SERVING PEOPLE o
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STATE OF FLORIDA
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COUNTY OF DADE
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Robert E. Uhrig
, being first duly sworn, deposes and says:
That he is Vice President of Florida Power &
Light Company, the herein; That he has executed the foregoing document; that the state-ments made in this said document are true and correct to the best of his knowledge, information, and belief, and that he is authorized to execute the document on behalf of said lA
. Y.sv lU 4 Robert E. Uhrig
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Subscribed and sworn to before me this 7
day of d Cut Odo 19h/
C'Lci k M. C /LQ1LLilo NOTARY PUBLIC, in and for the-County of Dade,
. State of Florida #
m.,3 petre, stata of nonda et Laros My commission expires: W C'**?,Expres o-tebar M 15 3
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