ML19317F752
| ML19317F752 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/12/1978 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| RO-780612, NUDOCS 8001230655 | |
| Download: ML19317F752 (3) | |
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ATTACHED IS PART 21 REPORT FROM IE MAIL UilIT
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PART 21 IDEllT,lfJCATION fl0.
C0i!PANY NAME [ Mh M 77-6yK-60/
DOCKET NO.
40 -3 c' 6 DATE OF LETTER _f-/2- / 7
'DATE DISTRIBUTED 4 -/f-7 P '
ORIGIf!AL REPORT s
SUPPLE!!ENTARY DISTRIBUTION:
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s RE ETdR(R)
FUEL CYCLE AND SAFEGUARDS (S)
MATERIALS (M)
NRR/ DOR (Stello)
NMSS/FC&MS NRR/ DOR (Stello)
NRR/DPM (Boyd)
AD/FFa!!SI '
NMSS/SG AD/R0I (2)
PDR AD/SI/IE AD/RCI ft.F A/DTS AD/ROI ( 2.)
M.:AATS REGIONS REGIONS REGIO!!S NSIC
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LPDR NSIC CENTRAL FILES-SS 396 NSIC TIC CENTRAL FILES (CHR0f!)
IE FILES (2)
CENTRAL FILES 016 CENTRAL FILES 016
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CENTRAL FILES (CHRO:;,
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CENTRAL FILES - SS E-ACTION:
PRELI!ilf!ARY EVALUATIO!! 0F THE ATTACHED REPORT INDICATES LEAD RESPONSIBILITY FOR FOLLON-UP AS SIICWN BELOW:
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Totruo FiDIGON June 12, 1978 LOWftt E. AoE v-serisi No. 447 Docket No. 50-346 License do. NPF-3 g g! D Mr. Jamed G. Kappler Itaglunal Director, Region 111 bb Office of Inspection and Enforcement I.
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b U.S. Nuclear Aer.ulatory Commission T7 D iu y (U) U 799 Roosevelt Road C
Clen F.llyn. Tllinois 60137 v
Dear Mr. Keppler:
In accordance with 10CFR Part 21.21(b), t.his is a report of a defect in i
some electrical terminations in esacntial systems outside enntainment in 1
the Davix-flenze Nucicar Power Station Unit 1.
This defect is similar to i
the defcet reported in Serial 429 dated 4/17/78, and it involves the use of environmentally unqualified "Scotchfil" brand electrical insulating putty and Scotch Brand 33+ electrical tape.
The inside containatenL use of the tape and putty previously ecported caused us to investigatu the ponsible uso nf the tape and putty outside containment-Design review indicated that only the following equipnent was suspect: morn m perated valves, solenoid-operated valves, motors rated at 600 volta and below. Design of other equipment used ternisal j
h1ocks, bushings, or connectors for terminations.
Two hundred and one devices potentially had spliced terminations utilising environmentally l
unt{us11 fled tape and putty.
Physical investigation of there 201 devices revealed a significant usage of the environments 11y unqualified espc and i
Putty.
i Radiation is the principle envircumental factor of concern, and the predicted accumulated radiation outside containment over the unit life is very low. The exact failure mode of the tape and putty at low radia-tion. levels is unknown, and slight degradation of the tape and putty t
system does not necessarily imply equipment failure. The effecta of
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uther environmental factors like temperaturn, humidity, and dirt outside containment in a nuelcar power plant are for the wast part bounded by I.
JU?! 1d 1978
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THC TOLEDO EDESCN COMPANY FDISnN PLA7A 300 MADGCN AVENUE TULEDO. DHr0 43652
r 2-t.hu affects of these factors in a fossil plant. The Scotch tape and putty are used extensively in fossil plants azul perform well. Vc have no inmacdiate cuncarn for failure of the Scotch tape and putty outside contaizuncut at Davis-Besse Unit 1.
flowever, the entrective action.is that the teminatirm.a will ha r= worked ut.11121ag environ:nentally qualified Raychem Series WCSF heat shrinkahle tubing. This rework may last through the first refueli.v. out.no of the unit.
This matter was reported to your Mr. T. Tambling on June 9.1978, and has not. been given to other licensees or purchasers.
Tours very truly, h
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