ML20079J433

Application to Amend License R-62,revising Tech Specs to Delete Ultrasonic Flow Detector W/Paddle Wheel Detector w/1% Accuracy Min

ML20079J433
Person / Time
Site:	05000124
Issue date:	09/24/1982
From:	Holian P VIRGINIA POLYTECHNIC INSTITUTE & STATE UNIV., BLACKSB
To:	Thomas C Office of Nuclear Reactor Regulation
Shared Package
ML20079J414	List: ML20079J413 ML20079J417 ML20079J433 ML20079J435
References
NUDOCS 8212280216
Download: ML20079J433 (1)

Text

e COLLEGE OF ENGINEERING VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY Blacksburg, Virginia 24061 NUCLEAR REACTOR LABORATORY September 24, 1982 Dr. Cecil 0. Thomas, Chief Standardization & Special Projects Branch Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555 RE: Docket No. 50-124, License No. R-62

Dear Dr. Thomas:

This letter is being written to request a change to our Technical Specifica-tions. Our current Technical Specifications list in Table I, Safety System Functions, Item No. 3, the Coolant Moderator Flow < Set Point detector as measured by a flow orifice in the process pit. Our proposed changes to R-62, Docket 50-124, Technical Specifications, submitted to you on May 15, 1981, listed in Table I Instrument Arrays, Section A, Measuring Channel, Detector column: Ultrasonic or Flow Orifice, D/P detector and Section B, Safety Channel, Detector column: Ultrasonic or flow orifice, D/P detector.

The Virginia Polytechnic Institute and State University Reactor staff proposes n to delete the reference to the type of flow detector and replace with: flow i '

detector, 1% accuracy minimun, over the full scale range measured. This proposed change is due to the following reasons t (1) presently, we desire to install a different type of flow detector (paddle wheel) than originally planned (ultrasonic);

(2) in the event of future flow detector and/or circuitry failures which require significant repairs, a spare detector could be expediently utilized (without a change in Technical Specifications);

(3) if future changes occur with the type of flow detector desired, no change in Technical Specifications would be required (yet minimum accuracy requirements would be assured), thus facilitating operational flexibility and safety; (4) requiring a minimum accuracy, as opposed to the detector type, will ensure safer operation since regardless of future flow rate changes (due to proposed power upgrade), detector changes, alarm set point changes, or procedural changes, the detector must operate according to a specified accuracy, and; (5) The 1% accuracy requirement complies with the presently-installed detector performance characteristics.

Sincerely, 2 N{}su

,, PDH:jd Peter D. Holian f l cc: T. F. Parkinson Reactor Supervisor VPI heactor Safety Committee VPI Reactor Staff / Operators

, 8212280216 821222 PDR ADOCK 05000124 P PDR