ML20009B955
| ML20009B955 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/29/1981 |
| From: | Papay L SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8107200075 | |
| Download: ML20009B955 (3) | |
Text
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1 Docket No. 50-361/362 FOR DCS PROCESSING Original document not available to NRC Southem Cai.fomia Edison Company Certified bylhLV3n Wub
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June 29, 1981
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Mr. R. H. Engelken, Director Office of Inspection and Enforcement
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s U. S. Nuclear Regulatory Commiss.on y'
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J-Region V Suite 202, Walnut Creek Plaza 5
JUL 171981 >
1990 North California Boulevard M v.s.w_ua wwon Walnut Creek, California 94506 g\\
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Dear Mr. Engelken:
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Subj ect:
Docket Nos. 50-361 and 50-362 San Onofre Nuclear Generating Station, Units 2 and 3 In a letter to your office dated June 1, 1981 we identified a condition which we considered potentially report-able in accordance with 10CFR50.55(e).
The condition concerns the use of brass or non-hardened steel washers by the supplier, ITT-Grinnell, in the assembly of certain mechanical shock sup-pressors in lieu of hardened steel washers as required by ASME Code.
Enclosed are twenty-five (25) copies of a final report en itled, " FINAL REPORT ON THE USE OF NONCONFORMING WASHERS ON s
ITi-GRINNELL SHOCK SUPPRESSORS, San Onofre Nuclear Generating Station, Units 2 and 3."
If you have any questions regarding this report we would be pleased to discuss them with you at your convenience.
1 Very truly yours, 7'
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Enclosures cc:
Victor Stello (NRC, Director I&D) g,l l
R. J. Pate (NRC, San Onofre Units 2 and 3) l 8107200075 810629 PDR ADOCK 05000361 S
I FINAL REPORT ON THE USE OF NONCONFORMING WASHERS ON ITI-GRINNELL SHOCK SUPPRESSORS San Onofre Nuclear Generating Station, Units 2 and 3 INTRODUCTION This report is submitted pursuant to 10CFR50.55(e)(3).
It describes a condition discovered during surveillance inspections conducted at the supplier's facility.
The condition involves failure to install ASME Code required hardened washers under the bolt heads on sizes 1/4 to 10 mechanical shock suppressors.
This report includes a description of the condition, an analysis of the safety implications, and a summary of corrective actions taken or to be taken.
By letter dated June 1, 1981, Edison confirmed noti-fication to the NRC of this potentially reportable condicion.
BACKGROUND On May 1, 1981, a Bechtel Quality Assurance Bulletin was issued which described a surveillance finding at the ITT-Grinnell Warren, Ohio, facility.
This finding indicated that, contrary to the requirements for hardened washers in ASME Section III, Subsec-tion NF, Paragraph NF-4724 - 1974 and 1977 Editions, the supplier had installed brass washers in sizes 1/4 and 1/2 mechanical shock suppressors.
In addition, the supplier had installed non-hardened steel washers in sizes 1 through 10 mechanical shock suppressors.
A brief survey of ITT-Grinne11 mechanica1 shock suppressors in-stalled at San Onofre Units 2 and 3 indicated non-code washers had been supplied.
DISCUSSION i
The following discussion is responsive to 10CFR50.55(e)(3).
Description of Deficiency The washers supplied with ITT-Grinnell mechanical shop suppressors sizes 1/4 through 10 are not in compliance with the requirements of ASME Section III, Subsection NF, Paragraph NF-4724 - 1974 and 1977 editions.
Analysis of Safety Implications An analysis of the safety implications has not been performed.
This condition is reported as a significant departure from the requirements of the ASME Code.
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Page Two FINAL REPORT ON THE USE OF NONCONFOPJIING WASHERS ON ITT-GRINNELL SHOCK SUPPRESSORS Ban Onofre Nuclear Generating Station, Units 2 and 3 CORRECTIVE ACTION 1.
A letter dated June 9, 1981 hs3 been sent to the supplier, ITT-Grinnell, notifying them of this condition as potentially reportable.
2.
All affected washers in ASME Code and safety related ITT-Grinnell mechanical shock suppressors installed in San Onofre Units 2 and 3 in sizes 1/4 through 10 will be re-placed with hardened steel washers.