ML19270H364

Final Deficiency Rept Supplementing 790618 Rept Re Missing Lower Jam Nuts & Bearing Lock Washers from Four Support Tube Assemblies of Pressurizer.Replacement Nuts & Washers to Be Installed

ML19270H364
Person / Time
Site:	North Anna
Issue date:	06/22/1979
From:	Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 7906270216
Download: ML19270H364 (2)

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Veaco  ; vmc.im accrme aso so.,a cc- ~v. mcoowo. v-im um June 22, 1979 Mr. J 1mes ') . O'Refily. 01r9ctor W ill 'h. 01 Offic? of Inspaction & Enforcement ')SE&C/93S:mac: wang U. S.1uchar Regulatory Comission Reqion II Occkat No. 50139 101 Marietta Streat. Suita 3100 Atlanta, Georgia 20303

Dear Mr. O'Reilly:

On June 13, 197'1, i recort was made under the provisions of 10CFR50.5S(a) concerning missing lower jam nuts and haaring lack washers frem all four support tune assemblies of the pressurizer.

In accordance with the recorting requirements of 10CFR21, the following information is submitted:

A. ' lame an.1 address of r? porting individual:

Mr. E. A. 3aum, Executive Manager Licensing and Quality Assurance Virginia Electric and Power Comoany P. O. Box 25566 Richmond, Virginia 23251

3. Facility, activity, and/or ccmponant affected:

.lorth Anna Power Station, Unit 2 Pressur1.7er Support Assembly C. Name of firm constructing the facility or suoplying the component, activity or service:

Stone & Webster Engineering Corcoration D U P. O. Box ?325 D

J bb Soston, Massachusetts 02'.07 D. Description of defect, 1eficiency, or failura to ccmoly:

The lower fim ruts and bearing lock Washers were determined to be missing from all four support tube assemblies of the pressurizer.

The lcwer jam nuts and bearing lock washers prevent movament (unthreariing) of the spherical nuts. The lowe spherical nuts a-a threaded on the succort tube assemblies and support the pressurizer ring girdar. Loosaning of the lower scherical nuts my result in lowering of the pressurizer and cause possible damaga.

E. Date of d3 termination of recertability:

2271 s35

.:une 19, i7n 7906270,2//,

r ife. h.ne s P. 0 ' h i l l y, Dirrctor ?

F. Similar componants, activitas, or services:

'Mrth An,a ?ower Statico, U'it 1

1. Corr-e-iva action which his been, is beinq or , sill ha taken, the imiividual responsible and the lenqth of time to cavalete the action:

Cor#octian acticn has been initiated. Raplicement jam nuts and bn3 ring icck eashers 3ra beinq ourchased and vill be installed prior to initial criticality.

11 Other information:

Since no other actions w'll be require *i to correct the problem descrioed in section D of this recort, we consider this to be the final report under the provisions of 10CF150.55(e)(3).

Shoulif you require furthat information, please contact this office.

Very truly ynurs, J. .

Srn C. Brown, !r.

S<:nier Vice Pres ident - Pnnar Stat ion Engineering and Ccnst uctina cc: Director, Office of Insoection and Enforcement (3) 2271 336

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