ML20126G792
| ML20126G792 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 03/06/1981 |
| From: | Aswell D LOUISIANA POWER & LIGHT CO. |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, W3K81-0105, NUDOCS 8103310870 | |
| Download: ML20126G792 (4) | |
Text
_-
-=
l PDR LPDR g
- NSIC.
CENTRAL FILES j[g l OUISIANA P O W E R & L 1 G H T! 9 c sex 6008 ua ceuscsce srase NE'N CALEANS LcV!S.ANA 70174 i
(SC4) 3ti6-2345 a
e MIDCLE south UT UT,ES SYSTEM 0 L A5wfu.
March 6, 1981 va amet **e aw te W3K81-0105 i
Q-3-A35.07.22 Q-3-A35.02.01 Mr. K. V. Seyfrit, Director, Region IV U. S. Nuclear Regulatory Commission 0)
((\\ \\c, Office of Inspection and Enforcement 611 Ryan Plaza Drive, Suite 1000 1
'4(<
a
,07,?
(( M.
Arlington, Texas 76012 gg.
9 8
SUBJECT:
Waterford SES Unit No. 3 0.,%g 8/g 12 0 g3 Docket No.30-382 e
y
'%*f4g Interim Report of Significant 8
Construction Deficiency No. 22 7
" Inadequate Electrical Insulation on Ex-Cos'O Neutron Fl'u< De tec tors"
'IlIN t
REFERENCE:
Telecon - L. L. Bass (LP&L) to B. Crossman (NRC) on 2/6/81
Dear lfr. Seyf rit:
In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Interim Report of Significan. Construction Deficiency No. 22, " Inadequate Electrical Insulation on Ex-Core Neutron Flux Detectors."
If you have any questions, please advise.
Very truly yours, t
,/Y NWY D. L. As'; ell DLA/LL3/;ri
- c:
1)
Director Office of Inspection i Enforcement U.
S. Nuclear Regulatory C:=cission s
Washington, D. C. 20535 (with 15 copies of report) 2)
Direccor Office of Management Information and Prograr Control C. S. Nuclear Regulat;ry Oc=rission Washington, D.'O.
20555 (with i copy of repor:)
810 8 810 Efo S
LOUISIriA ?O'ER S LIGE COM?A'.~'"
..A L;, C33 S::,
r~.. r..
.m.
,v a
In: erin Reper: of Significant Construe:1:n 3eficiency Nc. 22 Inadecuate Electrical Insulation en ?_x-Core Neutron Flux Dete:: Ors Reviewed by I
Rf J. Milhiser / Site Maf.ager
'Date Revieved by J f4111s - Projec: Superin:enden:
Da:e
?evieved h.v*
Y.ws' / M. ff//.'
9t! )
3 - $' h.l
/
- f. Egre - ?:cle :' Licensing Engineer '
0 :e-~
(.!%n 4
Tn d Q) M h ' h
" 8 el 2
~
6 Reviewed by L. F. 5:insen - Site Q. A. Progra: Manager Oate March 5, 1951
.J
t SIGNIFICA'iT CONSTRUCTION DEFICIENCY NO. 22 INTERIM REPORT INADEQUATE ELECTRICAL INSULATION ON EX-COF2 NEUTRON FLUX DETECTORS INTRODUCTION This repor: is submitted pursuant to 10CFR50.55(e).
It describes deficiencies in the electrical insulation of the Ex-Core Neutron 71.ux ' Detectors.
DESCRIPTION Combustion Engineering Incorporated (C.E.) notified the Ebasco Site Manager, I
through letter No. C-CS-9270-263 dated 12/24/SO, tha: the present insula-tion between the Ex-Core Detector and the holder assembly (Astrcquartz) is inadequate to maintain proper electrical insulation over the life of the detec:or and that the insulation will be replaced by a more durable material (Refrasil). Additionally, C.E. submitted procedures for the renoval of the present insulation and the revrap and subsequent testing of the Refrasil insulation.
These detec:crs vere received at We. 3rford SES Uni: No. 3 on February 5, 1930, and are currently in storage in the 1-A Warehouse.
SAFETY IMPLICATIONS Based on the infor atien submitted, Licensing has de: ermined that this cen-dicion is a reportable incident because if the insulation had no: been re-placed, electrical contact could develop between the detec:or and the holder assembly.
This could lead to performance degradation and/or total loss of the detec:or.
Since these dete:: ors are used as input to the Reactor
?rotective System (R?S) to initia:e Engineered Safety Features (ESF) if off-nertal condi:1cns are de:ec:ed, : heir unco:pr =ised operation is re-quired.
The re fo re, :he presence of inadequate insulation : uld result in a degradation of safety-rela:ed systers, r,,,.
uva.s:C.......c.
. m. 4 t
{cdifica:::ns :: effec: :Orrec:ive acti:n have been provided by Octbustion angineerin; through Field Ac:1:n Reques: (FAR) ge, ;o3g,
- n su 2377, 33,
=cdi:ica icn pro:edure outlines :he follcwing s:eps:
The detec::: assembly must be Opened, and :he detectors fas:ened :o :he s:iffener :: re:ain : heir sane relative pesi:icn vi:h respec: :o :he noacer.
.ney are :.nen 11:.ted :.::= the holder assembly.
While :he holder is cpened, the old as:ro quartz insulating sa: is re=oved and replaced with :he new =a:arial.
1 j
_2_
The actual rewrap.will require HITCO Type C100-48 woven silica cloth surrounding each detector, insulating it from the detector holder.
)
Before and af ter the modification, resistance readings are taken to l
assure the adequacy of the repair procedure.
The final step involves caulking the entire perimeter of the detector j
assembly where the two halves come together to prevent debris and other foreign =atter from entering the holder assemblr.
Discussion between Ebasco'and Combustion Engineering is currently under way to determine the location where rework will be-accomplished.
The location where this rework is effected will be identified in the final report to be submitted on or before July 31, 1981.
d r-