ML20030C513

Final Deficiency Rept Re Omission of Locking Devices on Threaded Fasteners of Certain Mechanical Shock Arrestors, Initially Reported 810710.Change to CS-P207 Eliminated no-washer Option & Replaced Soft Washers W/Hardened Washers

ML20030C513
Person / Time
Site:	San Onofre
Issue date:	08/05/1981
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 8108260189
Download: ML20030C513 (4)

Text

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50.55(e) Report br' F

Docket Nos. 50-361/362 Southern Califomia Edison Company SCE PO. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFOPNI A 91770 August 5, 1981 g

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'A Mr. R. H. Engelken, Director f(

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U. S. Nuclear Regulatory Commission o 31931 *"

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1990 North California Boulevard Walnut Creek, California 94596

Subject:

Dacket Nos. 50-361 and 50-362 San Onofre Nuclear Generating Station, Units 2 and 3 In a letter to your office dated July 10, 1981) we identified a condition which we consider reportable in accordance with 10CFR50.55(e).

The condition involves the omission of locking devices on threaded fasteners of certain mechanical shock arrestors as required by the ASME Boiler and Pressure Vessel Code.

Enclosed in accordance with 10CFR50.55(e) are twenty-five copies of a Final Report entitled, " Final Report on the Omission of Locking Devices on the Fasteners of Certain Mech:Inical Shock Arrestors, San Onofre Nuclear Generating Station, Units 2 and 3."

If you have any questions regarding this report, we would be pleased to discuss this matter with you at your convenience.

Very truly yours,

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Victor Stello (NRC, Director I&E) y R. J. Pate (NRC San Onofre, Units 2 & 3)

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AD12-IR SONGS 2/3 August 5, 1931 Mr. R. H. Engelken, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1990 North California Boulevard Walnut Creek, California 94596

Subject:

Docket Nos. 50-361 and 50-362 San Onofre Nuclear Generating Station, Units 2 and 3 In a letter to your office dated July 10, 1981 we identified a condition which we consider reportable in accordance with 10CFR50.55(e).

The condition involves the omission of locking devices on threaded fasteners of certain mechanical shock arrestors as required by the ASME Boiler and Pressure Vessel Code.

Enclosed in accordance with 10CFR50.55(e) are twenty-five copies of a Final Report entitled, "Finsi Report on the Omission of Locking Devices on the Fasteners of Certain Mechanical Shock Arrestors, San Onofre Nuclear Generating Station, Units 2 and 3."

If you have any questions regarding this report, we would be pleased to discuss this matter with you at your convenience.

Very Truly Yours, L. T. Papay Vice President LLSeyler:1b i

fb cc:losures Enc Victor Stello (NRC, Director I6E) gg R. J. Pate (NRC San Onofre, Units 2 & 3) bec: (see page 2)

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i Mr. R. H. Enge14en August 5, 1981 Page two 4

bec:

R. Dietch D. W. Gilman (SDG&E)

H. Peters (SDG&E)

D. R. Pigott (Orrick, Herrington & Sutcliffe)

H. B. Ray /J. J. Wambold H. L. Richter K. P. Baskin/W. C. Moody J. G. Haynes C. N. Saatjian S. H. Gold 3

l H. L. Ottoson j

J. M. Curran D. M. Barron 1

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E. Sparks (3)

'yIL. L. Seyler P. A. Croy

.l D. E. Nunn H. F. McCluskey (Bechtel) i R. L. Rogers (Bechtel)

S. H. Freid Bechtel)

L. W. Hurst Bechtel)

QA Files (55 e)-81-12)

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e FINAL REPORT ON THE OMISSION OF LOCKING DEVICES ON THE FASTENERS OF CERTAIN

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MECHANICAL SHOCK ARRESTORS j

San Onofre Nuclear Generating Station, Units 2 and 3 1

INTRODUCTION i

This report is submitted pursuant to 10CFR50.55(e)(3).

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describes a condition involving the omission of lockwire from threaded fasteners on certain mechanical shock arrestors manufactured by Pacific Scientific, as required by ASME BPV Code.

This condition was discovered during investigation of another condition which was reported to NRC in a letter dated June 1, 1981.

That condition involved use of brass or 4

non-hardened steel washers on fasteners of Certain Mechanical Shock Arrestors manufactured by ITT-Grinnell instead of use of hardened steel washers as required by ASME BPV Code.

I BACKGROUND During a field survey to determine the extent of the use of

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soft washers in ITT-Grinnell mechanical shock arrestors, it was determined that fasteners on some Pacific Scientific j

supplied mechanical shock arrestors (PS snubbers) had been j

installed without washers or any type locking device.

ASME Boiler and Pressure Vessel Code,Section III, Subsection i

NF requires that, if high strength bolts are used a hardened l

washer is required under the nut or bolt head (paragraph NF-4724).

Other threaded fasteners, except high strength bolts, require a locking device to prevent loosening during E

i service.

The bolts supplied by Pacific Scientific do not require hardened washers, but do require lock wires.

The bolts supplied by ITT-Grinnell require hardened washers.

DISCUSSION j

The following discussion is responsive to 10CFR50.55(e)(3).

Description of Deficiency A Field Change Request to Construction Specification CS-P207 was issued and incorrectly approved to allow field installation I

of both ITT-Grinnell and Pacific Scientific Saubbers without washers.

The instructions for use of lockwire on Pacific Scientific Snubbers is included in the Pacific Scientific installation manual and was overlooked by field construction l.

personnel.

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s FINAL REPORT ON THE OMISSION OF LOCKING Page T :c DEVICES ON THE FASTENERS OF CERTAIN MECHANICAL SHOCK ARREST 0RS San Onofre Units 2&3 Analysis of Safety Implications An analysis of the safety implications has not been performed.

This condition is reported as a departure from the requirements of the ASME Code.

Corrective Action The schedule for completion of the following corrective actions is under evaluation and development.

That schedule will be furn-ished to the NRC in a supplementary report.

1.

Design Change Package (DCP-5P/S) was issued on July 9,1981.

This DCP provides for:

a)

A change to CS-P207 to eliminate the no-washer option for ITT-Grinnell mechanical shock arrestors and installa-tion of missing washers.

b)

Provides for the replacement of soft washers on safety related ITT-Grinnell sizes 1/4 to 10 with hardened washers.

2.

A Nonconformance Report with supplemental data reports will be written to identify all Pacific Sciantific Snubbers requiring addition of lockwire.

Instructions will be issued from San Onofre Units 2 and 3 project engineering to field construction engineering to install lockwires as required per Pacific Scientific installation manual.

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