TXX-4001, Interim Deficiency Rept Re Letdown HX Anchors.Initially Reported on 830506.Anchor Bolts Found Bound in End of Slotted Holes Prohibiting Movement.Mounting Configuration Revised
| ML20072N347 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 07/07/1983 |
| From: | Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Madsen G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, TXX-4001, NUDOCS 8307150294 | |
| Download: ML20072N347 (2) | |
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TEXAS UTILITIES GENERATING CO.TIInNY
... nin m i> u n m u. w n m m. = >
R. J. GARY
'" M 1 0f "'all' July 7, 1983 NI@{ gg TXX-4001 I
JLt 8 583 Mr. G. L. Madsen, Chief a
i u Reactor Projects Branch 1 U. S. Nuclear Regulatory Corm 11ssion Office of Inspection and Enforcement 611 Ryan Plaza Drive, Suite 1000 Docket Nos.:
50-445 Arlington, TX 76012 50-446 COMANCHE PEAK STEAM ELECTRIC STATION LETDOWN HEAT EXCHANGER ANCHORS QA FILE: SDAR 110; CP-83,-10 FILE N0.:
10110
Dear Mr. Madsen:
In accordance with 10CFR50.55(e), we are submitting the attached report of actions te.en to correct a deficiency regarding the Letdown Heat Exchanger Anchors. We had previously informed your Mr. J. Gagliardo of the deficiency on May 6, 1983. We have submitted an interim report dated June 2, 1983, logged TXX-3680.
Support documentation is available at the CPSES site for your Inspector's review.
Very truly yours, R.
. Gary RJG:In Attachment cc: NRC Region IV - (0 + 1 copy)
Director, Inspection and Enforcement (15 copies)
U.S. Nuclear Regulatory Commission Washington, DC 20555 8307150294 830707 PDR ADOCK 05000445 j b J1 a
/
S PDR 1I
r TJX-4001 July 7, 1983 ATTACHMENT LETDOWN HEAT EXCHANGER ANCHORS Description of Deficiency In reviewing the mounting installation of the letdown heat exchanger for an unrelated issue, site engineering observed the anchor bolt configuration.
The mounting design calls for slotted holes on one end of the heat exchanger to allow thermal expansion. The anchor bolts were found to be bound in the end of the slotted holes prohibiting movement.
The letdown heat exchanger is not required to shut down the plant or mitigate the consequences of an accident. A preliminary evaluation by the supplier (Westinghouse) has indicated the equipment would probably not be overstressed under normal conditions but, under OBE and SSE conditions, the potential exists for the components to be overstressed.
Safety Implications In the event the existing conditions had gone undetected, the structural and pressure boundary integrity of the letdown heat exchanger and associated components could not be assured during a seismic event.
Cor_rective Actions The mounting configuration will be reworked in accordance witi..he supplier's recommendations. The revised configuration will conform to original mounting requirements. The rework will be completed no later than September 1,1983.
Based upon our examination of other equipment, we have determined the concern is not generic.
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