ML19206B224
| ML19206B224 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/16/1976 |
| From: | Arnold R Metropolitan Edison Co |
| To: | O'Reilly J NRC Office of Inspection & Enforcement (IE Region I) |
| Shared Package | |
| ML19206B216 | List: |
| References | |
| GQL 1312, GQL-1312, NUDOCS 7905080090 | |
| Download: ML19206B224 (2) | |
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POGT OFFICE BOX 542 READING. i ENNS's LVANia 10cQ3 TE LEPHONE 215 - 929-2001 GC.L 1312 Septerter 26, 1976 U.S. Nuclear F.egt.latory Canissica Office of Inspecticn & Enferccment Pegicn 1 631 I%:k Ilenue King cf Prussia, Fernsylvania 19406 Attenticn: Mr. J. P. O'Failly, Directcr
Subject:
Three Mile Island "uclear Staticn Unit 2, Lice.se Do. CPPR-66 Docket Ko. 50-3':0
Dear Sir:
Cn August 18, 1976, Mr. L. Narrow cf ycur office as verbally notified of a situaticn which I'.arrc olitan Tdisen Ccngny censidercd to to rcxrtchie in accc cnce wi2 the req =recents cf 10 CPR 50.55(d. This letter constitutes the regaired 21:01 day follcw--up letter.
Descripticn Uhile filling tm !?aclear Service Cicsed Ccoling t'ater Heat D: changers with river unter cn the cccling kntar side, leaks are disecvercd in de altnint:r.-brcnze tde sheet to carhen steel s."n weld.
The prcblera had heen evaluated to have been caused by pipe spring, hemver, no evidc2ce of excessiee pice spring was noted en investigacicn. The leakage in de welds of the heat ench::rger was attrihuted to pc csity ard a void at de rect of the mld. It is helieved th t when the gasketed joints are made t:0 lack cf parallel" exiswd in the rating surfaces causing the weld jcints to fM 1 Weld repairs mre rade a.d a hyd:.cstatic test was per-fornni cn the safety related ecclers ::S-C-1A and 13.
A new gasket was installed, and de water bcn acain fit ur to t".e coolcc. Uhen crecificd tcrque was reached cn de head stuis several gapc cf up to 0.C60 inches wrc neced at locaticns het. men the gasket and de tdc sheet.
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7 905 08 00 7D
Mr. J. P. O'Peilly U.S. 1:cclcar regulate:7 Camiscicn Page 2 Analv_cis of Safety _ Dmlicaticns A total cf seven heat cxchancers of this ejpe were pur-cP2 sed frcr. Eniticek, the vender, for use in c1c td ccoling tutcr S'StCrs.
AllEvCn ' rave nc~.I ECCC filled ard onO ad-f diticnal ccoler wns disecvered to Pave similar le&.s.
'n o of the three lcahing ecolcrs ar2 safer / related.
Had this ccndition rcrai.ed undetected, water frcr. the clcstd cccling water systcr.c knuld hcVe' centinucd tc leak cut ento the ficer. Cver a pericd of tir:2, tro ' d.s cculd have gotten p rgressively trrce u.til it sculd be i.pcasible to neke up cufficient ' nter co the cicacd cccling unter systcrs.
It is c::tm:.civ. unlikciv. eat a leak of this ragni=de truld go unncticcd a-d unreraircd. Fcr this rearcn, this i.cident would not have cc=rriced the health and cafety of tha p""'ic or the plent staff.
Ccrrective ?ctien, Tc.e velds kure repcircd using a q ' 4 # icd Knld preccdure.
Tne integrit.y of the welds was ched<ed bv the dv.e renetr_nt nethcu,.
The gars bettican the rating surfaces of the fla.Tcs will be rcduccd to less thm 0.024 inches in acr'ance with the
.ranufacturcrs stzrdari.
Very truly ycurs,
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,R. C. Arnold Vice Preside.t F.CA : J.'M: rk q
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