ML19220D077
| ML19220D077 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/22/1976 |
| From: | Robert Carlson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Arnold R METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7905160475 | |
| Download: ML19220D077 (1) | |
Text
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e UNITED STATE:
NUCLEAR REGULATORY COMMISSION REGION 1 631 PARK AVENUE KING OF PR USSI A, PEN N SY LV A*JI A 19406
$ 2 7,2 is Metropolitan Edison Company Docket No. 50-320 Attention:
Mr. R. C. Arnold License No. CPPR-66 Vice Pre ident P. O. Box 542 Reading, Pennsylvania 19603
Reference:
Your letters, GQL 1090, 1182 and 1256 dated July 30, August 18 and September 2,
.976, respectively.
Gentlemen:
Thank you for the above rt 'erenced letters which forwarded reports pursuant to 10 CFR 50.55/->
Your corrective actions in these matters will be reviev
. ring subsequent inspections.
Your cooperation with us is appreciated.
Sincerely,
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Robert T. Carlson, Chief Reactor Construction and Engineering Support Branch cc:
R. L. Wayne, QA Manager, Design & Construction T. M. Crimins, Jr., Safety & Licensing Manager R. W. Hewa rd, J r., Project Manager W. A. Verrochi, Vice President, Design & Construction Geralri Charnof f, Esquire Miss Mary V. Southard, Chairman, Citizens for a safe Environment 120 090 OtuTICS O. b Z IM \\
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TELEPHcNE 215,- 929-0601 i OFFICE ECX 5:2 RE ADING, PENNOYLVANI A 1 EGO 3
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Director of Nuclear Reacter Regulation g,
Office of Ins;.ection & Enforcement p' h.-
U. S. Nuclear Regulatory Cec =1ssion
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Washington, D. C. 20555 Attention:
Dr. Ernst Volgenau, Director Subj ect :
Three Mile Island Nuc1 car Station Unit 2, Docket No. 50-320 Daar Dr. Vc1genau:
On June 18, 1976, Mr. L. Narrow of your office was verbally nctifiad of n situcti:n --hich Metrcpolitan Edice Cenpany considered to be reportable in a cordance with the requir e.ents of 10 CFR f 0.55 (e). This letter constitutes a thirty-day follow-up letter.
Descricticn As ; art of the construction of the shield walls and slabs around the fuel transfer tubes, holes were drilled into the north cxterior vnll of the Fuel Transfer Canal for reinforcing dcucis.
During the precess of drilling these holes and exposing the rebar, a void was opened within the concrete ever both fuel transf er tubes.
Each void extended about 3 to 4 feet into the cencrete, was approxi-r.ately IS" high and 6' to 8' wide.
The voids were located in a section o.f the wall that had initially been bicckcuts for the subsequent installation of the-fuel transfer tubes. Apparently, when the blockouts were poured, the interior portion of the peur did not fill the keyways on top of the blockouts leaving the recently detceted voids.
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A similar condition was di fuel transfer tubes en the sout DUPLICATE DOCUMENT Euilding and was reported to Pr February 20, 1976.
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OST CFFICE BOX 92 REACING. PtN*.SYLVAtJI A 10CO3 TELEPHCNE 2'5-9:1501 August IS, 1976 GQL 1102 Office of Inspection and Enforcement, F.e;; ion I U. S. Nuclear Regulatory Cccaission 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention:
Mr. J. P. O'Reilly, Director Gentle =en:
Subj ect:
Three Mile Island Nuclear Station Unit 2, Docket No. f0-320 Butt Solices en GE AKD-5 Switchgear
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On July 20, 1976, Mr. L. Narrew of ycur office was verbally notified of a situation uhich Metropolitan Edison Cc:pany considered to be report-able in accordance with the requirements of ICCr?.50.55(e). This letter constitutes the required thirty day follow-up letter.
Descriotion While performing internal wiring changes on GE AFD-5 switchgear as directed by the engineer, several butt splices located en top of the switchgear for the unit substations pulled apart.
The electricians p.erfor=ing the wiring changes were repairing these splices as they broke. No record was =aintained of the number of splices which required repair.
When the problem was 4 dent.*ied' General Electric Cc=pany was,
4 contacted to in:crs then o' Ru tion and to request a remedy tor the prob 1e-.
G furnished a.4 eld
...""dneer.to inspect each splice
,0-adequacy.
Each splice wcs pu ned ^#i d y (approx 4Cate1/ 10-15 lbs.rorce) and cny that pulled apart were --- e pa red and re-inSPectCd-Cut of about 1,0C0 splices chec e v GE'_only 7 splices failed.
Four of the failed splices occurre
,a net substations.
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The butt splices on one saret'.
DUPLICATE DOCUMENT 2-2 DC) have not been inspect' be de-energized at this time.
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- m. r ::. s r,T OF:CE CcX 542 REAclNG, PENNSYLVANI A 19603 TELEPHCNE 215 - 9:9GC1 Septenter 2,1976 G E 12:c Mr. J. P. O'Reilly, Director Office of Inspection and Enforcement, Regicn 1 U. S. Nuclear Ecgulatorf Ccrniscien 631 Park Avenue King of P ussia, Pennsylvania 19406
Dear Mr. O'Reilly:
5 Sject: Three Mile Island Nuclear Station Unit 2, Decket No. 50-320 Response Time On Aug1.st 3, 1976, Mr. L. Narrow of your office was verbally notified of a situation which Matrcpelitan Edisen Cc=panf consid::cd to be reportable in accordance with the requirements of 10CFR50.55(e).
This letter constitutes the required thirty-day fc11cw-up letter.
Descri, tion Gathefing information en required and expected Engineered Scfety Features response ti=es during the preparation of the respense time test progran revealed that several cf the expected response times (based en vender test data, diesel leading sequence, etc.) were in excess of the required ti=es established by FSAE analyses or other considerations.
See attached Table I.
Analysis of Safemi Inclications If the discrepancies in the required versus expected response times had re=2ined undetected, and if a LCCA coupled with a total loss of offsite power had occurred, the consequences of such an acci-dent conceivably cculd have exceeded those consequences of this accident as calculated in the plant safety analysis, however, preliminar" evaluation indicates that the effect would be slight, adding only about 0.3 psi to the calculated peak containment pressure, and wculd thus have produced onigt--
such an accident en the health c staff.
' l DUPLICATE DOCUMENT Entire document previously entered Corrective Actier H into system under:
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