ML19322A659

Supplements 720602 Response to AEC Questions Re QA Program. FSAR to Be Revised Reflecting Unit 2 as-built Condition. Stressing Pressure Gauges May Be Replaced & Hydraulic Pump Relief Valves Will Be Recalibr

ML19322A659
Person / Time
Site:	Oconee
Issue date:	06/30/1972
From:	Thies A DUKE POWER CO.
To:	Jennifer Davis NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19322A654	List: ML19322A653 ML19322A657 ML19322A658 ML19322A659
References
NUDOCS 7911210720
Download: ML19322A659 (3)

Text

1 U.S.A.E.C' DUKE POWER COMPANY COMPLIANCE ll O

Powra Buxt.orwo ANId, Cd, 422 Sourir Cuuncar STazzT, CIIARI4TTz, N. C. assot g A. C. Tatzs P.o. Box arve St=ca wet P=es.me=,

Pnooucten uso hasmiss o=

June 30, 1972 Mr John G Davis U S Atomic Energy Commission 3

Directorate of Regulatory Operations Region ll, Suite 818

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230 Peachtree Street, NW Atlanta, Georgia 30303 Re:

C0:ll:CEM 50-269/72-2 50-270/72-1 50-287/72-1 ar Mr Davis:

My letter of June 6 advised you that we intended to supplement the information contained in the enclosure to my letter to you of June 2 with respect to tendon elongation on Oconee Unit 2.

The following additional information is submitted with the paragraph numbers below corresponding to those in that enclosure:

Paragraph 2 At the end of each stressing cycle, gages then in use will have their calibration checked and documented.

Paraoraoh 4 a)

The FSAR will be revised to show the as-built condition of Unit 2 Reactor Building. The content of the as-built condition will be similar to Unit I presently included in the FSAR.

b)

We have investigated the possibility of replacing the present gages with ones having greater reading sensitivity than 100 lb increments.

The gages presently in use were furnished by Prescon as part of the stressing equip-ment. Prescon recommends this particular gage in their field stressing manual and also used this particular gage on other sites including Turkey Point. We experimented with a gage which has 10 lb increments and found it to be unsatisfactory for this use.

Prescon arranged to send us a gage with 50 lb increments which we experimented with to sea If it was satisfactory.

This gage, along with the 10 lb increment gage, experienced excessive vibration.

This condition, in addition to smaller increment divisions, made these gages extremely difficult to.ead.

We have requested, literature on other alternative gages and will centinue our investigation.

In the absence of acceptable alternative gages with the use of our current procedures the present gages will be satisf actory.

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• • MrJbhnGDavis PA 2 1

June 30, 1972 l

Pacaqraoh 5 We will calibrate the relief valves on the hydraulic pumps between each stressing cycle; however, the primary function of these valves is equipment protection and the tendon stressing pressure is measured by use of two pressure gages on the stress-ing equipment.

Paracraoh 6 On the two previous units, a weekly report was issued Indicating the status of the tendon operation as it progressed. We will continue this status report for Unit 3 tendon operations with distribution th' rough the Project Manager level.

Very truly yours, sfe j

A C Thies ACT/s i

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