ML19317F356
| ML19317F356 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 11/12/1973 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317F353 | List: |
| References | |
| NUDOCS 8001140610 | |
| Download: ML19317F356 (3) | |
Text
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O DUKE POWER COMPA!1Y OC0tlEE flUCLEAR STATION lilCIDENT REPORT CORROS10fl lilVESTIGATION OF UNIT 2 TEND 0!1S NOVEMBER 12, 1973 r
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-0C0 flee flVCLEAa STATION lilCIDEtif REPORT CORROSI0tt INVESTli."\\ TION Ol' UNIT ~ 2 TEN 00tlS NOVEMBER 12~, 1973 q
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- Introdection
-At approxim tely?ll':3'0a.m. on_0ctober 16, 1973, it was discovered that four
- tendo'ns; mark -31 H31, 31 H32, 31 H33, and 31H34 had not been greased on Uni t. 2
' Reactor Buliding. ;The ungreased. tendons.wcre discovered during an inspection
'for. leaking grease;cdps.
"Mr.lljanff Jape. of LAEC', Directorate of Regulatory Operations, was.notifled-that-the above_ tendons had not been-frcased. Also, Messrs. J. E. Smith, S.1b. 2 Hager, T. H. McDaniel, D. L. Freeze, D. G. Beam, R. L. Di ck, and W.-S'. Lee we're notified.
0n'Octoberil'6,;1973, Unit 2 was in the pre-operational test phase with fuel loaded. Zero power physics i.esting had not started.
- 2.0 Scquence of-Eve'nts See Attachment A 30.
. Evaluation-
- Design Engineering advised.that excessive corrosion was not expected since
- tl.a tendonsLwere coated with-NO-0X-10 500 prior to installation.
Since the itime' interval betWeen tendon installation and discovering the ungreased
. tendons was approximately two years,:the_ tendons should be inspected prior to' greasing.
Pesign Engineering would provide an inspection procedure (At.tachmen t : B).
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- Since-excessive corrosion was not expected, the Reactor
- Building was 1 structurally sound.
Unit 2 was in the pre-operational test phase and no other structures or systems'were affected by_the ungreased tendons.
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Corrective'Actlori The ; Construction Department. developcd _ and approved. procedure.183 (At tachment. C)
- from Design. Engineering's procedure for inspecting the,ungreased tendons.
InD. addition,' procedure 187. (Attachment 'D)' was developed and approved to verify
- that the1 remaining Unit.2' Reactor':BuildingLtendons were greased.
'LTendons. 31 H31,. 31 H32, and 31 H33 were inspected in accordance eith procedure il83'and'foun_d,to be satisfactory. The; inspection. sheets are enclosed in J
At ta c hmen t; E.'
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' Based.upon(the satisfact'ory condition'of the above tendons and physical
$1nterferencesLthe inspection procedfure (183) was( revised prior to -inspecting-tendon; 31H34; LThefproposed; revision was reviewed by Design-Engineering 'and
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pg AEC/DRO.,
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Tendon 31111h spc. Inspected in accordance ui th procedure 133, revision 1, dated 10-24-7j, and found to lie sat li.f ac t ory.
f vere retensienci anil/or grear.cd.
/11 Tendens 31!!31, 31!G.', 311133, and 31113 acc.cssihic tendons in linit 2 Reactor Duilding uere inspected in accordance with psocedure 137 and found to i.e greased.
50 Verification The insp:etion of the four ungreased tendons indicated there uns not any corr _osina. da.nage as the resul t of not applying perranent grease protection.
values and The ten hs ucre restrest.ed to comparabic ar.-found 1if tof f
-great.ed, thereby returning the building to its designed criterion.
in Uni t Beactor Coll <!ing uere found to be greased.
All at.cessibin tendrant, 6.0 Safety,/ gal,yp,
Recurrence has beco climinated by the inspection of all accessible tinit 2 f
tendons in accordain.;c with procedure 137 70
.E. nclosu r e s Attachuent A Log Sheets Ai i.u.i.-o. T.
i...%iepi i s.qi ne:o r i ns.. Proc. dure
/,ttachecnt C Construction Procedure 133 Attachment D Construction Procedure l'17 Attachnent E Inspection and Prestress Docuracntation Attachnent T Greasing Documcr tation Attachment L Tendon filling Docunentalion At t ac! bent 11 Pressure Gage C..libration Sheets Attach acnt l' Grease DocuiaantnLion i
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