ML19322A625
| ML19322A625 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 03/01/1971 |
| From: | Seidle W US ATOMIC ENERGY COMMISSION (AEC) |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML19322A624 | List: |
| References | |
| NUDOCS 7911210697 | |
| Download: ML19322A625 (2) | |
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4 loc m No. 50-269 Cn February 25, 1971, during a site in:pection, c. I. Murphy and c. M.
Upright, the Region II inspectors, were advised by the subject licensee that a piece of polyethylene he.d bcen tra;;ed between the mating flanges of the reactor core sup;crt shield and the ccre ' carrel. Preliminar/- in-formation obtained frcs H. L. Zunnicutt, Principal Field Ingineer, Duke
?cwer Cc pany, is as follevs (;reliminary information regarding this matter advanced to you by telecen en February 27, 1971):
G e core su;;crt shield 1 ver flange stes.to the upper flange of the core barrel (Figure 3 !.6 cf the FSA2). S e.two asse blies are bolted together with 120 bcits spaced cn 3-11/16-inch centers.
During the assenbly of these ec ;cnents in the vessel, the licensee had draped 4 =11 polyethylene ever the valls to afford protection and to maintain the established clean c:nditions of the vessel and interne.ls.
After all bolts had been installed and their retaining clips he.i been tack velded to them, it was fcuni that ene secticn cf ;cly-ethylene six feet icng had been trapped between the =ating surfaces.
S e licensee atte=;ted to pull the tra;;ed material out and suc-ceeded in removing a stri; a;;roximately three feet long. Se width cf this stri; was a;;rcy'-etely 1/3 inch. Atte= pts to re ve the renaining piece vere unsue:ess^;.l. Se licensee esti=ates that the' remaining stri; is also a;;reni.ately 1/3 : 3/16-inch vide and 3-feet 'leng. Since the distance frc: the telt hcies to the edge of the flange is 5/8 inch, the licensee is cf the c;inien~ that this vould represent the maxi =u= pessitie width of the strip.
':'ve plies of the material exist f:r a distance Of alcut six inches at ene end of the' strip. The licensee has naie tests cf the polyethylene sheet -
and found that when ce: pressed tc the degree calculated.to be a;;roxi-stely-. represented by the tcrqued bolts, that the thickness -is reduced frc 4 mils to 1 mil. L2 e licensee-has ;catulated that the polyethylene vill melt.during 0; err.tien s.nd does net censider that the relaxation'of the tol s vill be a pretles. Se study was not 4
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J. 3. Eenderson March 1, 1971 cc=plete as yet, however, and Eunnicutt was not able to state what vould be the effects of the material in the coolant system. Hunnicutt advised the inspecter by telephone en February 27, 1971, that chemi-cal analyses vould be =ade of the polyethylene to detemine whether halogens were present. The licensee plans to issue an in-house report on the incident.
When the inspector attempted to examine the installation, he found that the pertable steel ladders used during the installation had been re=oved and a rore ladder with voci rungs had te- "etalled.
In cli=bing on this ladder, the inspector observed voed splinters falling from the rungs. Excmination of the rungs indicated that numerous splinters could have been dislodged frc= the rrngs and fallen into the internals. When the inspector pointed cut that the use of this type ladder ec=prc=ised the vessel cleanliness, the ladder was removed i==ediately. Because of the installation of the vessel internals, hcvever, Eunnicutt could not advise the inspector of a method that could be u:ed to assure that the splinters could be located and removed.
Hunnicutt advised the inspector that che licensee vould advise Region II of the results of any studies or analyses that were made regarding these events.
We vill also follevup en these ite=s during the next scheduled inspection.
/
i W. C. Seidle CO:II:CL!
Senic Reactor Inspector cc:
E. G. Case, DRS (3)
P. A. Morris, ERL R. S. Boyd, DEL (2)
R. C. DeYoung, ORL (2)
D. J. Skovholt, LEL (3)
P. W. Hove, DRL (2)
A. Gia=busso, CO L. Kornblith, Jr., CO R. E. Eng11 ken, CO J. P. O'Reilly, CO R. W. Kiric-an, CO :I
- 3. E. Grier, CO:III J.- W. Flora, CO:IV R. W. Smith, CO:V REG Files e-..r l
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