ML20128C537
| ML20128C537 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 06/25/1968 |
| From: | Thornburg H US ATOMIC ENERGY COMMISSION (AEC) |
| To: | James O'Reilly US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 9212040463 | |
| Download: ML20128C537 (2) | |
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-June 25, 1958 J. P. O'Reilly, Chief, Rcactor Inspection and Enforccacnt Eranch Divisica of Compliance, Headquartcrs 1
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DOCKET I;0. 50-263 C0;; TROL IwD DRIVE EYDia'JLIC 1.II;E PENETia:IO:; - WELD EURN-Ti:KOUGil
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Information is provided cencernin;; the tes t data and subuc.utnt discov-ery of burn-through of four control rod drive hydraulic lines'at the structural wc1d there the line pcnctrates the dry well containment shell.
Mr. C. Jones of Rcp, ion III learncd as the result of a telephonc
.i call to Clifford J. Tice, Assistant Superintendent of Construction for Northern States Power Coapany., the licensce, on May 1/.,
196S, that four control rod drive tube penetrations had beca located that contained burn-through at the tube to dry well wcld. These arcas had been lo-cated by borescopic methods after a.: tempts to locate them by ultrasonic and hydrostatic tests had failcd.
Infor. nation as received from thc' liccasce is sum;uri:(
as follows:
1.
General Electric Compan:, was unable to tcs the cuces by ultra-sonic methods until thcy had a 3/4" probe fabricated to replace the 1" probe supplied by APED.
Even the sec.llcr probe could not he inserted into certain lines due to the lack of tolcrc.nce betueen the probe and the sockets velded on. the end of cach line.
In other instances, c::terior equipment such as bus bars prevented inscrtion of the probe. In al;,165 of 243 tubes were tested; of i
ti.es e, 24 ;svc sliv.t indications which could not be interpreted.
l 2.
All containment shall intcrior uulds ucrc inspccted visually and i
no undcreuttin; u s rcported.
3.
Each of the 245 tubcc ccre s %.::cd to a aydrostatic test for 10 minutes at 2625 psis. Sevcp tubcc ucre observec t.: Icu at 1
t..e socket ice.c, on the en;, c;. uc.a unc. Ao cuote ire...:
su= ry of a report submitted to tcc.icensee by CE, "
11 240 tunes ucre t(sted.
Of these, scven did not hold pressure but were retcstcu three times and all held a sufficient tiac to n
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Borescoping, a third. test procedure, uns c= ployed to visually inspect the in:erfor suricce of & p!5c. @ this caans, f our.: eld crcr s
-vere located whcre the wcld s d baru d..ircu;.. the pipe. This vas ci nfirecd by use cf a wire probe.
5.
b ccision has c.ccc
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,-icce the scven sock.cc-welds when t.he rcrlindcr vi ti.e control roc drive piping is.
installcd. As for the four burncd-through tubes, the licensco reported that insert siceves were being considered but"that no eccisicn on t.ne ;,1x hau..coca approved.
C-luinn Ret.lts frc.a the UT terts ut.re not conctucivc. 'Ec.ca frc. the hyc.ro-static test revealed cisc ellaneous ici ks -in the syc tcm, out it failed to indicate a veld defect in the cost ax;ortant location.
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to indicate tiic wcld failure may Tac f ailtrce of t'ic, hydros tatic tes t
- l. ave been caused 'gy the burn-thrc. mh c: curring dering the root pass
- l and then subsequent wc1d passes completing the exterior ucid surfa e.
sut::ciently to.nold the hyc.rostatic tect pressure.
Anis in:. creation
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Acacs to the reconsideratton ci stu11ar pencerations et
- t,ne testing cI.
Dresden 2 and 3 and Quad Cities 1 and 2.
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