ML20107K525

Forwards Response to NRC 960325 Rai,Supplementing Response Made on 951111 & Original Amend Request to Correct Lanquage in Ts.Affected TS Page Also Encl

ML20107K525
Person / Time
Site:	University of Texas at Austin
Issue date:	04/16/1996
From:	Bauer T TEXAS, UNIV. OF, AUSTIN, TX
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20107K527	List: ML20107K525 ML20107K546
References
NUDOCS 9604260193
Download: ML20107K525 (4)

Text

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. DEPARTMENT oF MECliANICAL ENGINEERING

[ T . THE UNIVERSITY OF TEXAS AT AUSTIN

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Qy NudrarEnginuring TeachingLaboratory ($12M71-5787 FAX (512)471-4589 April 16,1996 Document Control Desk US Nuclear Regulatory Commission Washington DC 20555

Subject:

Response to Questions NRC letter March 25,1996 Docket 50-602

Dear Sir:

The following information is in response to the Request for Additional Information letter dated 3/25/96. This response supplements the response made 11/11/95 and the original amendment request dated 25/1/95. The request and response to questions correct language in the original Technical Specification. No change to the reactor operating conditions is being proposed. Revisions to the affected pages of the Technical Specifications have been made and are enclosed. The changes replace those provided in the original request (25/1/95) and subsequent response 11/11/95.

Sincerely,

$W T.L. Bauer Assistant Director / Reactor Supervisor Nuclear Engineering Teaching Laboratory

Enclosures:

Affidavit

- Response to Questions TS amendment pages 9,14,15,44 cc: B.W. Wehring

-D.Klein i

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Street Address: 10100 Burnet Road Austin, Texas 78758

• Mail Addrns:J.J. Pickle Research Campus Bldg.159 Austin, Texas 78712 9604260193 960416 -

PDR ADOCK 05000602 P- PDR

UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of &

The University of Texas &

at Austin & Docket No. 50-602 J.J. Pickle Research Campus &

Nuclear Engineering Teaching &

Laboratory &

AFFIDAVIT Mark G. Yudof being duly sworn, hereby deposes and says that he is Executive Vice President and Provost, The University of Texas at Austin; that he is duly authorized to sign and file with the Nuclear Regulatory Commission the enclosed l Response to Questions (NRC letter 3/25/96) regarding Technical Specification 3.2.2, for docket 50-602; that he is familiar with the content thereof; and the matters set forth therein are true and correct to the best of his knowledge and belief.

NA -Y Mark G. Yudof Executive Vice President and Provost Subscribed and sworn to before me, a Notary Public in and for the State of Texas, this / 8 day of A 9f'i I .1916 bLDADvu N-NOTARY PUBLIC in"and for tlie State of Texas 7: : - _ :: - _-. . - _,__

l C SHARON NOTARY PUBLIC H. YOUNGl l-

-( State of Texas b'

, Comm. Exp. 0512 97  ;,

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Response to Question Docket 50-602 1

Amendment Request 25/1/93

1) a. The Spedfication 3.2.2 Reactor Control Systems has been revised to clarify the modes. Each mode is separately identified by column and the appropriate "X" is made to identify the applicable interlocks. A modification has been made to the definition of shim rod (page 9) to avoid possible

ambiguity in applying the definition Changes have been made to page 15 to maintain the format and style of the table on page 14 for the tables on page 15.

'- b. The basis for the specification in (a) has been rewritten to use the term

" mode" only as intended by the definitions in the specifications. In this case, the mode of operation is defined by the position of the corresponding mode switch. The description includes revisions to improve readability.

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2) The relative meaning of the terms in the response to Question #4 (8/2/94) are inconsistent with the terminology. The use of " period increase" and " shorter

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period" were stated relative to the startup rate instead of the period as used in i the paragraph. Revise parts (b) and (c) to read as follows:

4(b). As the power rate of change signal exceeds the limiting value, the  !

automatic control signal changes from positive (or zero) to negative. The corresponding reactor period decreases driving the regulating rod down. The

change in the period combines with the difference between the current and demand power to control the down motion of the rod until the demand power condition is met. At the maximum drive down speed the reactivity change is roughly equivalent to that of the shim rod.

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4(c). Automatic mode control will maintain the reactor period at the limiting period condition only if the error signal exceeds 20% of the demand signal. A progressively longer period limit applies as the automatic mode approaches the setpoint for demand power until the period becomes infinite at the control point.

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