ML19319E154
| ML19319E154 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 06/25/1970 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Rich Smith NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML17198A052 | List: |
| References | |
| NUDOCS 8003310673 | |
| Download: ML19319E154 (2) | |
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SACRAMENTO MUN6CIPAL ' UTILITY DISTRICT C 6201 S Street. Box 15830, Sacramento, Califomia' 95813: (916) 452
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Juns 25, 1970 United States Atomic Energy Commission 9.Il.llg y#
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. Division of Compliance, Region V
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Berkeley, California 94704 g J;/lj g.g
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.k Attention: Mr. R. W. Smith, Director
% Caez; gena,.6 Dear Mr. Smiths s;*
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AEC Division of Compliance Audic Rancho Seco Nuclear Generating i
Station, Unit No. 1 May 26 through May 28,' 1970 We have reviewed the construction discrepancies which were
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' discovered on subject audit as set forth in your letter of June 18, 1970.
The District has taken action on these matters as follows:
1.
AEC Audit Finding:
The Preliminary Safety Analysis Report, Appendix 3C, Section 4.0.f.,
states, with respect to Cadweld splices,.that "A permanent line shall
. be marked 12 inches back from the end of each bar for a reference point to confirm that the bar ends are properly centered in the splice sleeve." Contrary to this statement, none of the Cadweld splices for the containment building walls observed during the inspection were marked in the manner described.
Corrective Action Taken:
The contractor was imediately notified of the discrepancies and had provided a written corrective action statement to the effect that thei prescribed marking of the rebar will be re-instituted and continued through completion of all cadwelding on Rancho Seco.
Inspection planning which details all the requirements of cadwelding, including the marking, has been written to provide objective evidence that each cadweld has been properly inspected.
A'sampla of 13 of the approximate 90' cadwelds exposed were radiographed to assure proper cer.tering had been achieved. All radiographs indicated that the cadwelds were properly centered.
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- R.' W..ielch June 24.-1970 d.
Follow-up audits have verified the effectiveness of the above corrective action. -
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AEC' Audit Findinst~
~ Section 8.4~.2 of the Chicago Bridge and Iron Company quality control
procedures relating to the welding of the containment vessel liner states, with regard to.the care and control of low hydrogen E7018 electrodes, that "... welders will be instructed to remove only'enough j
electrode from the heated storage oven to be us'ed during one shifc.
Excess electrodes which have been exposed. to.the atmosphere shall be stored in the-holding ovens." Section 8.5 (e) of the quality control
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,l procedures states that the Project Welding and QA Supervisor will J
exercise control over welding materials by "... policing work ' areas once a day to make sure thet loose bundles of electrodes are removed."
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Our. inspector observed the following practices which are contrary to l
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the' procedural controls discussed above..
1 a.
Low hydrogen E7018 electrodes were stored in a cold storage bin rather than in a heated oven.
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b.
Ten low hydrogen E7018 electrodes bare found in an open container
. adjacent to' a work area-below the equipment hatch.
L Corrective Action Taken:-
A.I The contractor has been notified in writing of the deficiency on i
weld rod control. In addition, meetings have been held with Chicago Bridge & Iron mangement personnel emphasizing the need for strictor control of weld rod.
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Bechtel has instituted a more intensive after shift policing of
,this activity to avoid recurrence of this condition.
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Follow-up audits have verified the effectiveness of the above correctivs action.
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' Evidence of the above actions will be available upon your next visit to Rancho Seco.
Very truly yours,
. J. Mattimos Assistant Chief Engineer i
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