ML19199A505
| ML19199A505 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/19/1977 |
| From: | Arnold R Metropolitan Edison Co |
| To: | O'Reilly J NRC Office of Inspection & Enforcement (IE Region I) |
| Shared Package | |
| ML19199A504 | List: |
| References | |
| GQL 533, GQL-0533, NUDOCS 7905030043 | |
| Download: ML19199A505 (2) | |
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1 METROPOLITAN EDISON COMPANY =.e::run cr ae:am ?cauc ur:unes cence.ar:cn /
i iFFICE SCX542 REACING. PENNSYLVANIA 196C3 TE LE?4CNE 15 - 9:3-;S01 A.,,,..-- -r,
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P.:. J. P. O'Reilly, Direc:cr U. S. Nuclear Regulate:7 Cor. issic Office of Inspectie & Ericree en:
Regie I 621 ? ark Avenue King of Prussia, Pe sylvania 19406 Cear Sir:
Three F.ile Island Nuclear S:stic: C 1: 2 ('DC-2)
License No. '??R-66 Decke: Jo, 50-520 Reacter Vessel and Inte=als Guide Elecks and Lugs C: F. arch 21, 1977, M.:. Lou Narrev of ycur office was verbally ectified cf a situatic which F.et: politan Edisc Cc=pany censidered ec be reportable in accordance vi:h the require =en:s of CCFR.50.55(e). This letter consti:utes the required thirty-day follev-up le :er.
Descriction As 3 result of several discrepancies noted during the pos: het functiccal inspectics of the in:ernals at the Davis 5essie ! plant, 3abceck & Wileex Cc=pany conducted a sd d'ar
- spec:1.,= c: -he 7.C-2 inte=als.
The results of these inspecticas ide::ified a field i=stsilatica prcble: vith the C 1: 2 in:emals guide blocks and eacter vessel gu: a lugs in that sc=e guide biccks did so: have sufficient gap be: vee: the bleck. and the lugs.
Ccesequently, this caused sc=e guide blocks to hold the 1 te: als sligh:ly cut of pesi:ica and exe:: undue force against other guide biccks whe: the inte=als were installed inside the reacecr vessel. Field =rasure=ents cf Cei: 2 guide block spacing shcwed a vide variatie=, and cc pariscus Oc field =easurecen:s of the Reac:cr 7essel Guide Lug indicated an i==: per se::ing.
~he gap of the se: c the W-axis indicates interference and c:e bicek had been pulled away frem the internals apprcr Staly k".
A=al rsis of Saf er r I licatiens Ivaluatics of the installa:1c precedure indicates : hat :he biccks were apparently :: qued to a value which did ct allev sc=e of the: := slip around the guide lugs prior to develling during :he initial fi:up.
- is believed tha: the bel: fr = :he guide black which pulled away frc= rhe inte =als ceuld have dr:ppi.d in:o :he inter cis during het func:10:a1 testing, and i: vculd have been discovered during the pest hot functional :est inspectice.
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@m *sOJ reason, repairs would have been i=ple=ented and there veuld have been no adverse effect en the herith or safety of the public or plant staff.
Correceive Action Se following actions were i=ple=ented aa corrective response to this inciden::
A 3&*J Iield Change was i=ple=ented i ccrporati:g revised precedures, a.
=easurements, eclera:ce and cri: aria.
b.
All guide blocks were re oved and inspected.
c.
All guide lugs were inspec:ed.
d.
Cc==enced verk in conjunction with repositiening of :he guide bicch;.
It is at:icipated tha: all required =edifica:1cus in the re=cval and re-installati:n of the guide biccks will be c:=pleted by April 30, 1977.
Ir.for=a:ica and docu=entatien associated with this incident vill be available at th4 ti:e for ;c tr inspection.
Very truly yeurs, R. C. Arscid Vice President ec: Dr. Erns: Volgenau, Director Office of Inspectica & I: force =en:
U. S. Nuclear Regula:Or7 Cc==issi:n
'a*ashington, D. C.
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