ML20084S773
| ML20084S773 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 01/05/1976 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20084S771 | List: |
| References | |
| NJK-76-3, NUDOCS 8306170243 | |
| Download: ML20084S773 (2) | |
Text
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Post Office Box 216 L
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Telephone 309/654-2241
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January 5, 1976
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Director of Office of Nuclear Reactor Regulation U. S.'Hucicar Regulatory Commission Washington, D. C. 20555
Reference:
Quad-Cities Nuclear Power Station Docket No. 50-265, DPR-30 Unit 2 Abnormal Occurrence Report No. A0 50-265/75-38 The purpose of this letter is to provide you with further information concerning the removal of the Quad-Cities Unit 2 recirculation pump dis-charge valve bypass piping during the recent core maintenance outage.
The removal was brought abcut as a result of crack indications in the "B"
loop bypass 1ine upper weld-o-let.
This occurrence had been reported in Abnormal Occurrence Report No. A0 50-263/J_f-38.
Based on evaluation of the various alternatives available and the results of a special test performed on Quad-Cities Unit 1, the existing discharge bypass piping and motor operated bypass valve were removed.
Sixteen inch long stainless steel spool pieces were installed at both weld-o-lets on each recirculation loop with caps welded on the outboard end of the spool pieces.
Piping work on the "B" loop was completed on October-31, 1975 and the "A" loop was finished on November 1.
All Non-Destructive Testing was completed on November 1, and a hydrostatic test was performed in conjunction with the reactor pressure vessel hydro on November 4 and 5 The details of the piping repair and replacement are given in work package 4031-75 and the line removal is documented in modification package M 2-75-27 A Reactor Recirculation Piping Stress Analysis from Sargent &
Lundy Engineers, Inc. and a Hanger Analysis from General Electric Company are included in this package. _0n-Site and Off-Site Reviews have concurred with this change and safety evaluation.
Region lll of the NRC has re-viewed the modification and repair program and found it to be satisfactory.
l This review was conducted on November 6, 1975 and is documented by lE Inspection Report No.050-265/75-23 A new wiring scheme was developed-to climinate the control and Interlock-function'of the removed recirculation discharge bypass valves, and to provide for a recirculation pump trip upon >10% closure from full open of the pump discharge valve.
This change is included in the modification package for the line removal and work details are given in work package 4150-75 8306170243 751014' 171 PDR ADOCK 05000265 S
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