ML20086G844

Part 21 Rept Re Gilbert Mfg Co Nylon Bolts Used to Make Connections Between Positive Bus & Leg of Distribution Panel Breakers.Nylon Bolts to Be Replaced W/Brass Bolts

ML20086G844
Person / Time
Site:	Browns Ferry
Issue date:	01/04/1984
From:	Parris H TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-83-105-000, REF-PT21-84 PT21-83-105, PT21-83-105-000, NUDOCS 8401120427
Download: ML20086G844 (4)

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- TENNESSEE VALLEY - AUTHORITY CH ATTANOOGA.-TENNESSEE 374o1 500A Chestnut Street Tower II January.4, 1984~

Mr. James P. O'Reilly,~ Director U. S. Nuclear Regulatory Commission

-- Office of Inspection and Enforcement

, - - Region IIi 101 %rietta Street, -Suite 3100

' Atlanta, Georgia -- 30303:

Dear Mr. O'Reilly:

TENNESSEE VALLEY UTHORITY - BROWNS FERRY NUCLEAR PLANT UNITS 1 AND 2 -

DOCKET NOS. 50- 9 AND -260 - FACILITY OPERATING LICENSES DPR-33 AND 10 CFR 21 REPOR g During performance of Surveillance Instruction 4.9.A.2.c (Battery Discharge

. Test) on diesel generator (D/G) D, it was found that nylon bolts are used to make connections between the positive bus and the positive leg of all distribution panel breakers. This was discovered when troubleshooting revealed that the loss of the normal battery charger was due to a nylon-bolt breaking.

The nylon bolts are used in panels with the wilowing nameplate data:

Gilbert Manufacturing Company Model'No. GM-16801 Los Gatos, California Multiple failures of these bolted connections could result in more than one diasel ^ generator being . inoperable.

This problem is reportable under 10 CFR 21- and was reported to me on December 30, 1983 Verbal notification.was made to D. Verrelli, of your-staff, on December 30, 1983 The enclosed part 21 report contains additional information about this matter.

Very truly yours, TENNESSEE VALLEY AUTHORITY e

H'. G. Parris Manager of Power E

Enclosures hhdCIAL COPV

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An Equal Opportunity Employer

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' L p: P c.J Tenn:sses Vall*.y Authority '

Form DF 119 a T* Browns Ferry Nuclear Planti Page 1 of 1 1 -i<

.I-BF 15.2 Enclosure 1 BF 15.23 "A' .' APR 271983 c-3, EVALUATION LOGIC FOR PART 21 '

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PROBLEM: Miley bolts U. sed la -Ugit lnad ^2 D/& /25V D?ne,%to'o A PA d e ls p IDENTIFIED BY: Ideat;4e.1 dor;,o oerAr,.nwe of SI 4.9. A.Z.c BAtterg_hbrge

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i A. Does the problem Test b w inv51ve:It CMrtitopher, r 1. Failure of goods and services to comply with applicable NRC requirements

[~ uirements are included in the procurement (regardless. of document) 'Yes whether/ / these.No / req //(If yes, go to C) 7_~

F 2. - A procured basic component failure resulting in a condition or circumstance that could contribute to exceeding a safety limit as defined by plant technical specifications. Yes / // No / / (If yes, go to B)

r- 3. Departure of a delivered component or service from the technical

.d requirements of a procurement document. on acceptance r by NUC PR (e.g. , at receipt inspection). Yes / Delivery / No / v occurs up/

(If yes, g go to B) o h~n'sireFai1TTue'sTioiti aIio~vd.~~Tf"aIfW~s,~~STdF~11ElfE ~ Tf nny-~~- ~6iesM3" " " " "-

y 999 thu g_gs_hgc_a_t_e_d_ _b L t,1 e_ 3 g ppXc_a_bl_e_ ,",GQ_ T_Q " s ta,t_e_n} e gh _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

l B. Is component necessary to ensure:

1. The integrity of the reactor coolant pressure boundary Yes / /, No / //

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2. The capability to shut down the reactor and maintain it Yes / // No / /

in a safe shutdown condition

~3 . The capability to prevent or mitigate the consequences Yes / // No / /

'of accidents Is security system deficiency involved? Yes / / No / //

, [Ca][@[o!{'((_~@M&~[I]6[}[][]65,~}[e[s['[s((}[~Gy[M[Q~[_-(([_~(((((((((([__~[_~((_]."(( ~

C. ' Could the defect have caused a substantial safety hazard? Yes / // No / /

l (By definition, item A2 constitutes a substantial safety hazard.),

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[C@@((((6[s[i[tij[ij, ggt,ggportable - If y_es_, this item is~[r~iE(ajl[e[i(([1j(([ art [EII-[

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D. Is this item reportable by. NUC PR under Part 217 Yes /// No / /

Submitted: W kReviewer &fLku '

/ /2/7/83 Date Reviewed: [ '

/ /2///h IJate '

g'ality Assurance Supervisor Approved: '

, f, / /2-/5-105 PORC Chairman Date

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Compliance Supervisor I'

Retention: Period - Lifetime; Responsibility - Document Control Supervisor

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• Revision: %v

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• M Tennessee Valley Authorn Page 1 D Browns Ferry Nuclear Plant Form BF 1<15 BF 15.23 7/2G/82 Attachment 1 Part 21

m. Report #

PART 21 REPORT u

Plant Brews Ferru Nuclear Pina2,_

References Noap PLJ Component or System Identification /25VPc Coa +rel Feuer_#a'4frikoti 4 F nel Diesel G raorator D L3asteM W 25

(- Eupplier of Component _G;lkers many/ALLlalso Co*ynny, k.0LCAtet,SA1LlersiA

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Nature of Defect or Noncompliance and Cause .S e e u h y-t-f J p

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[ Extent of Safety Hazard Mu lt,'gfg [ Adores of sese L.. It ed c oaa ett,'ons could result la mee %na one 'Lesel

. eeHerntor helag $8agetAble.

Date Which Defect or Noncompliance Was Discovered NayfmJff_22f il Number of Identical Compenents in Use _7_4/elp5]X - I9 holta_Edd/h'PI5)

Location of Components (Ju.'t / A n d 2 D ies e l G en e ra t91_ _/15 V D_C_

p Dls trib o Llo ,> PA n e l.s__

L Corrective Action and Recurrence Control Taken or To Be Taken

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Expected Completion Date U~ aunty _81,I983 Ilas defect or noncompliance been reported previously? Yes / / No / //

If yes, by what means?

_ _ ._ -l Date lA U Submittec by

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0? IS'

/ I OltC Ileview l> ate 1

f _& Y-t buperin . adent Approval late Iletention : Period - Lifetime, P.esponsibility Document Control Supervisor

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e-Enclosure 2 Nature of Defect or Noncompliance and Cause - A 1/4" x 1-1/2" nylon bolt broke in the Gilbert Manufacturing Company model GM-16801 125VDC distribution panel ~ causing the normal battery charger to be disconnected from the diesel _ generator (D/G) D battery. Nine nylon bolts are used to make . connections between the positive leg of all distribution panel breakers and the positive bus. Upon replacing the bolts, three others were also found with distorted threads in D/G D panel. Several distorted bolts were also found in D/G B panel.

Corrective Action and Recurrence Control Taken or to be Taken - Nylon bolts will be replaced by brass bolts (reference EN DES safety evaluation, MEDS accession number NEB 831130 218). The nylon bolts were changed out in units 1 and 2 D/G B distribution panel on December 1, 1983, and on D/G D distribution canel on November 30, 1983 Bolts in D/Gs A and C distribution panels will be changed out at the earliest opportunity. All bolted connections in the unit 3 D/G 125VDC distribution panels are made using metal bolts.

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