ML20114B096
| ML20114B096 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/21/1992 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CP-92-10, TXX-92380, NUDOCS 9208250002 | |
| Download: ML20114B096 (2) | |
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1 Log
file # 10111
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Ref.
- 10CFR50.55(e) 7UELEC7RlC August 21, 1992 l
WiCam J. Cahm, Jr.
Group Vice tresident U. S. Nuclear Regulatory Commission l
Attn:
Document Control Oesk
!~
Washington, DC 20555
SUBJECT:
COMANCHE PEAM STEAM ELECTRIC STATION (CPSES) - UNIT 2 DOCKET NO. 50 446 l-CONTAINHENT SPRAY PUMP W NT WELD CRACKS SDAR CP-92-10 (INTERIM REPORT)
Gentlemen:
On July 22, 1992, via facsimile TV Electric notified the NRC of a report 4ble defect in two welds on 3/4" containment spray pump suction vent piping.
Attached is the written report which satisfies the reporting requirements of 10CFR50.55(e).
The report has been formatted in a manner that corresponds to-the specific.information requested by subparts (1) through (viii) of paragraph 10CFR50.55(e)(8) of the regulation.
This it exclusive of that portion of subpart (viii) regarding advice that has been or will '., given to other entities outside of TV Electric.
Such advice would be dependent on the. entities' specific use and operating / maintenance history of the subject components.
Our final report on this defect will be submitted by October 30 1992.
Sincerely.
I f*g /
William J. Cahill, Jr.
~JTC/tg Attachment i
Distribution c-Mr. J. L. M11hoan. Region IV hr. B E. Holian, NRR Resident Inspectors, CPSES (2) l
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- LAttachmen't-to TXX-92380-Page 1 of 1 10CFR50.55(e) REPORTABLE DEFECT CONCERNING CRACKED WELOS IN CONTAINHENT SPRAY PUHP SUCTION VENT PIPING (i)
Information supplied by:
i William J; Cahirl, Jr.
TU Electric 400 North Olive Street, L. B. 81 Dallas, Texas. 75201 (ii)
The basic component is a 3/4' stainless steel vent pipe on the
. suction of the Train "A" containment. spray pump.
Lfiii)
The f acility is being constructed by Brown & Root for TV Electric.
(iv)
.Two welds on a-3/4" stainless steel vent p*pe for the containment spray' pump suction were found cracked during system flushing.
The welds had passed post weld QC inspection and system hydrostatic testing.
During the recirculation phast of a loss of Coolant Accident, the vent-line~ could contain radioactive liquid. f rom the containment sump.
This~liquio ;ould be released in the containment spray pump coom representing a serious con,romise of the ability of a radiction confinement system to perform its designed function.
(v)
This defect was identified and documeited on June 14, 1992.
J (vi)
No other. defects of this type have been found.
=(vii)
The affected section of piping was removed for evaluation and replaced with new pipe and fittings.
The welds have been-*9nt to
- a-laboratory to determine the cause of cracking.
The ' history.of the welder who made both welds will be collect?d and.a radiographic reject' rate analysis will be performed to determine if further evaluation of the welder's wo-k is required.
- Corrective actions will be complete prior to Unit 2 fuel load.
-(viii)
CPSES Unit I was' informed ~of the defect.
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