TXX-3415, Modified Deficiency Rept Re Diesel Generator Pipe Support Alignment,Initially Reported 800926.Manufacturer Did Not Comply W/Asme Stress Allowables.Calculations & Weld Insp Procedures Revised
| ML20031D768 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/02/1981 |
| From: | Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Madsen G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, TXX-3415, NUDOCS 8110140155 | |
| Download: ML20031D768 (3) | |
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8 68l Mr. G. L. Madsen, Chief Reactor Projects Branch U. S. Nuclear Regulatory Commission Office of Inspection & Enforcement 611 Ryan Plaza Drive, Suite 1000 Docket Nos. 50-445 Arlington, Texas 76012 50-446 COMANCHE PEAK STEAM ELECTRIC STATION DIESEL GENERATOR PIPE SUPPORTS FILE NO:
10110
Dear Mr. Madsen:
In accordance with 10 CFR 50.55(e), we are submitting the attached modified report of actions taken to correct the identified deficiency regarding the diesel generator pipe supports. We previously made a verbal report to Mr. W. A. Crossman on September 26, 1980 and submitted I
interim reports logged TXX-3222 and TXX-3268, dated October 21, 1980 and January 12, 1981, respectively.
I On July 29, 1981, we transmitted our formal report on this subject via our letter number TXX-3374. The attached report modifies and supersedts this previous submittal to reflect information learned through a follow-up review by our site engineering group.
If we can provide any additional information, please advise.
% IN~,./g Very truly yours, g
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U. S. Nuclear Regulatory Commission Washington, D. C.
20555 8110140155 811002
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TXX,3415 October 2, 1981 ATTACHMENT DIESEL GENERATOR PIPE SUPPORTS DESCRIPTION OF DEFICIENCY The technical specifications for the CPSES Unit 1 and 2 Diesel Generator imposed the requirements of ASME III Subsection ND for auxiliary piping systems which in turn imposed the requirements of Subsection NF on associated component supports. The effective edition of the Code required stamping of these supports.
The component supports - fabricated by the supplier (Delaval) - were shipped partially assembled on the auxiliary skid base unit fabricated by a subtler vendor (Kaiser Steel).
All' welds were shop inspected by the supplier in accordance with a shop procedure based upon ANSI B31.1 for visual inspection.
Piping alignment dif ficulties encountered in the installation of the component supports necessitated the review of supplier /subtier vendor documentation. This review indicated the supplier had manufactured the supports without, acknowledging the requirements of Subsection NF.
ANALYSIS OF SAFETY IMPLICATIONS In a seismic event resulting in the loss of off-site el ?ctrica sources, an inadequacy of power necessary to operate plant safety related auxiliaries could result.
CORRaTIVE ACTION Corrective Action i'or the deficient condition consists of establishing compliance of the fabrication of the supports to the AISC Ccde. The design of the supports has been certified by the supplier to bc in accordance with the ASME Code. However, a followup review by the CPSES Site Engineering Group indicated that the structural calculations on approximately seventeen (17) out of ninety (90) supports (per. Auxiliary Skid) utilized stress allowables not consistent with the ASME Code.
Three majtr activities are included in the final resolution of this matter:
- 1) Engineering Calculations - Correct the calculations for the supports in question and revise support drawings for subsequent refabrication, as required.
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- 2) Weld Inspection - Using an inspection program based upor. AWS D1.1, ConstruHion Ouality Control personnel will inspect all I
accessible welds.
Unacceptable welds will be evaluated and I
appropriately dispositioned by Engineering.
- 3) Supporting Documentation - A package will be compiled by Engineering which will provide acceptable documentation for the component supports.
The oackage will consist of:
a) Welding Procedures 4
b) Welder Qualifications c) Material Certifications Corrective Action including rework as required will be completed prior to fuel delivery to site.
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