TXX-1264, Responds to NRC Re Violations Noted in Insp Repts 50-445/75-05 & 50-446/75-05.Corrective Actions:Reactor Cavity Areas Containing Most Damage Removed as Part of Safeguards Bldg Excavation

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Responds to NRC Re Violations Noted in Insp Repts 50-445/75-05 & 50-446/75-05.Corrective Actions:Reactor Cavity Areas Containing Most Damage Removed as Part of Safeguards Bldg Excavation
ML20245K017
Person / Time
Site: Comanche Peak, 05000000
Issue date: 12/12/1975
From: Caudle R
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To: Madsen G
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20245J949 List:
References
FOIA-87-535 TXX-1264, NUDOCS 8905040305
Download: ML20245K017 (5)
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CASE Exbibit  ;

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I Deccaber 22, 1975 i 7:O;-1264 ':

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};r. G. L.1:adsen, Chief .

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I P.cceter Construction end Operations Branch

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i Of fice of Inspection 5 Enf orcecent g 613 F. yon Plaz . Dr. , Suite 1000 g ArlinCten, Tm:ss 76102 l CC:'.A':CIE FEAK STIM: ELECTP.1C STATION i 10SO-E2 2300 l'W I!:ST3LLATION EEACTOR LUILDI!;G D:CAVATION ELi': CC:; TROL 1:0. }:00507T4 TILE };0. 10110 I;;.r 'r IMdren:

In ..: cord:nce with the ice,uircrunt, cf 20Cr:OC.% (c) (".< f . o u r 2 4, ,r:.r T:O:-667, to you on 2-4-73) crd ycur sub:ce,ucnt letto: 4:ted Jun.

107.k , we are submittin; the f ollo..in; description of our invectJr.:. tion and corrective action.

Ac previously reported, hori:ontal f racturcs verc discovered when e>:covation of Units 1 cnd 2 reactor cavitiec were ccepicted. The crecs centeining the cost da: age vere renoved as p-rt of the saf ecuerd building excavation. The methed of removal cf this rech vos as f ollov::

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1. A n:rreu trench was swn to a depth o! crpro:<inntely 30 inchen, e;;;:L ;.t ; c :..

dictence of 10 f eet from the perire:et of the contair.nent The reck between these limits vss rc=oved by using a inrge bachhoc.

The exposed surfar.es were then cleaned and inspected, cnd fractures i  :

were found to still exist. G The second trench was savn a distanc of 20 feet from the perimeter f.

2. I of the contair=ent and the rock removec as above. Inst .: tion 5 revealed to fractures remaining in t.ds section. i J
3. The third trench was then cut in the s:ce lecction as step 1 chove -

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snd the rock removed. Inspection revened that all horizontal j f ractures had been removed. i clined in the pro'ect

' 4. The rc=oved rock was then repiscec. :.. .. elevstJen of EO .L I,.s t . r specifications, by dental concretc .

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I CASE Exhibit gy Page $F

. t:t . C. L. t' edt.cn Lcec.ber 12. 1975 9

l Vertical frcctures ucre : Iso f ound as a restit of the blastings. All  !

the f ractures were tjght and radiate out fret the center of the con-tain ent excavation with the exception of thor.e described belev vhich ,

occurred wher, the s.,fcguard buildings ucre blasted. There are three fractures in Ur.it No. 1. These f ractures are en the rnuth side nect -h the north-scuth centerline. They are tangential to the er.cavation, '

trending to the east f or an undetermined distance er.d were opened approximately 1/8 it.ch. _ Grout pipes were installed in the d, cuts 1 concrete tackfill, Crnut is to be placed af ter placement of Coetsinment No.1 foundation. There in one f racture in Unit No. 2 which is on the north side and runs from the northeast corner of the saf enur.rd building, curv-ing around f rom an casterly trer.d to a southerly trend, intersecting the centsinment excavation near the north-south centerline. This fracture is open 1/S of an inch in the referenced corner and tight at the txcavation intersection. A grout pipe is to be installed and grout placed af ter placement of the Contain=ent No. 2 foundation and the us11c in the No. 2 safeguard building.

Uurerous record phcto;raphs in cddition to detailed geolo,c,1c nors are evcilabic ensite shculd they be required.

As outlined in your June 4, 1975 Ictter, cil blasting operations have been i=plemented within the frcncuork of the pertinent require. tents of Appendix B to 10CTR50.

If we cay provide any additional information, please cdvise.

Very truly yours, j ' f*h' ti iM6 .

3 Robert U. Caudie l Engineer In Charge .

]4 R4+ 4f RUC/ JH: Jet f cc: Director. Office of Inspection -

J; and Enforcement, U.S. NEC (15)

Director, Office of }bnagement Information end Program Control, U.S. NRC (1) l 6

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c -1 4 OFFICE MEMO f.'6% .\

Q we-DATE: February 5. 1975 TO: C. L. Whitford FROM: P. L. Bussolini

SUBJECT:

Monthly QA/QC Report for Comanche Peak Steam Electric Station Attached is the Comanche Peak Steam Electric Station QA/QC Report for the month of Eggj Please distribute as required by CP-QCP-1, Organiz-ation ano noministration. .

F.A / 6 L Peter L. Sussolin)

Project Quality Assurance Manager

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CASE EXHIBIT /V "INF0E1T.ilt" JGPV[

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Texas Utilities Generating Co. -2 hia rch 6,1975 h?> 1 7,'- j 4:

Pursuant to the provisions of Section 2.201 of the NRC's " Rules of k',

Practice", Part 2, Title 10, Code of Federal Regulations. Section I

2. 201 requires you to submit to this office, within 30 days of your C receipt of this notice, a written statement or explanation in reply $3 ,

' i including: (1) corrective steps which have been taken by you, and the results achieved; (2) corrective steps which will be taken to avoid F].

further noncompliance; and (3) the date when full compliance will be $c achieved.

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In accordance with Section 2.790 of the NRC's " Rules of Practice", E 3 Part 2, Title 10, Code of Federal Regulations, a copy of this letter h N

and the enclosed inspection report will be placed in the NRC's Public Document Room. If the report contains any information that you h believe to be proprietary, it is necessary that you submit a written h

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application to this office / within 20 days of the date of this letter, requesting that such information be withheld from public disclosure. '/'

The application must include a full statement of the reasons why it is M f claimed that the information is proprietary. The application should 8,  !

l' be prepared so that any proprietary i:Jormatien identified is contained ,

in an enclosure to th'e application, s'.nce the application without the f enclosure will also be placed in the 'Public Document Room. If we do q j not hear from you in this regard within the specified period, the report will be placed in the Public Document Room.

V Should you have any questions concerning this inspection, we will be }

pleased to discuss them with you.

E Sincerely,  :

5 p .b r G. L. Madsen, Chief .

Reactor Construction and [

Operations Branch

Enclosure:

IE Inspection Report Nos. 50-445/75-05

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. . O n 1E INSPECTION P '3OR T No. 50-44 5, ". s.0 5 50-446/75'-05 .

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