ML20009B955

Final Deficiency Rept Re Use of Nonconforming Washers on ITT-Grinnell Shock Suppressors,Initially Reported 810601.All Affected Washers in ASME Code & Safety Related Suppressors Will Be Replaced W/Hardened Steel Washers

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 '

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ROS E M EAD, C ALIFORNI A 91770 m .......... ,o..,,.....

June 29, 1981 Mr. R. H. Engelken, Director

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Office of Inspection and Enforcement ' N/ ,

s U. S. Nuclear Regulatory Commiss.on [

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. y' Region V k' Suite 202, Walnut Creek Plaza 5 JUL 171981 >

1990 North California Boulevard M v.s.w_ua Walnut Creek, California 94506 *** wwon ,ja g\

Dear Mr. Engelken:

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J 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 sitled, " FINAL REPORT ON THE USE OF NONCONFORMING WASHERS ON 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'

Enclosures cc: Victor Stello (NRC, Director I&D)

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R. J. Pate (NRC, San Onofre Units 2 and 3) g,l l

l 8107200075 810629 PDR ADOCK 05000361 S PDR

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.