ML20054F821
| ML20054F821 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 06/07/1982 |
| From: | Schroeder C COMMONWEALTH EDISON CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| 4279N, NUDOCS 8206170359 | |
| Download: ML20054F821 (6) | |
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Commonwoelth Edison
(
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) One First National Plan, Chicago, Illinois O } Address Reply t Post Offica Box 767 i
Chicago, Illinois 60690 Jun e 7, 1982 Mr. A. Schwence r, Chie f Licensing Branch #2 Division o f Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
LaSalle County Station Units 1 and 2 Separation of Class 1E and Non-Class lE Cable Trays NRC Docket Nos. 50-373 and 50-374 References (a):
License NPF-11, Condition 2.C.(24).
(b):
NUREG 0519, LSCS SER, Section 8.4.6.1.
Dear Mr. Schwencer:
Reference (a) requires that Commonwealth Edison shall provide adequate separation or barriers between Class 1E and adjacent non-Class 1E cable trays prior to startup, following the first refuel outage.
Reference (b) provides additional detail and concludes:
"As a result, the applicant committed by letter dated September 11, 1981, to perform a test (of the most limiting separation configuration in their plants) to demonstrate that faults induced in nonsafety-related cable will not l
cause the f ailure o f adjacent safety-related cables.
If the test fails as determined by the NRC staff, the i
applicant has further committed to make the necessary l
modifications to provide adaquate separation of barriers prior to startup a f ter the first refueling oucage.
Th e existing separation between Class 1E cables and non-Class lE cables is such that there is a low probability during l
early life of the cables that a short or failure of i
non-Class 1E cables will cause f ailure of Class lE cables.
We find this commitment acceptable.
Therefore, we will l
condition the operating licenses for these modifications to be completed prior to startup af ter the first refueling i
outage for LaSalle if this separation test fails."
00/
l 8206170359 820607 PDR ADOCK 05000373 A
A. Schwencer Jun e 7, 1982 Commonwealth Edison and its architect engineer, Sargent and Lundy, have prepared a proposed " Electrical Separation Tes t" confi-guration to demonstrate that faults induced in nonsafety-related cable will not cause the failure of adjacent safety-related cables.
This proposed test configuration is enclosed.
It is requested that the NRC review the proposed test configuration, determine its acceptability, and notify Commonwealth Edison so that detailed tes t procedures can be developed.
If there are any questions in this matter, please contact this office.
Ve ry truly yours,
- 0) kcJsist C. W. Schroeder Nuclear Licensing Administrator 1m cc:
NRC Resident Inspector - LSCS 4279N l
l l
4 l
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SARGENTQ LUNDY
'E N G I N E E R O CHICACD 5-19-82 ELECTRICAL SEPARATION TEST PUNCHLIST ITEM 3.52
(
REFERENCE:
SER SECTION 8.4.6.1) 1.
PURPOSE To justify the conclusion that fire or failure resulting from electrical faults induced in Non-Class lE cables will not cause
-electrical failure of Class lE cables directly above.
2.
TEST CONFIGURATIONS:
All cables tested will be obtained from La Salle stock and a.
be qualified to IEEE 383-1974.
b.
Cable failures will be induced by electrical faults only.
Both power and control cable configurations will be tested.
c.
(Instrumentation cable trays all have covers and have insufficient potential energy to induce damage.)
d.
"Non-lE" power cable trays will be filled to a design index of 1.25.
"Non-lE" control cable trays will be filled to a closign index of 1.4.
i Failed cables will be located in the center of the cable e.
tray representing the' non-Class lE installation.
f.
Cable trays will be solid bottom 10 foot lengths of 30" wide tray from La Salle stock.
V Cable trays representing Class lE configurations will be l
g.
installed 1 foot above the top of the lower "Non-Class lE" tray.
Centerlines of both trays,will be parallel to each I
other.
i h.
Conduit will be rigid steel, lh" diameter, 10 foot lengths i
and liquid-tight galvanized steel (sealtite) 5 foot langths from La Salle stock.
l
CARGENT Q LUNDY E N G l (J E E R @
CHIC AWD ELECTRICAL SEPARATION TEST PUNCIILIST ITEM 3. 52 5-19-82 REF:
SER SECTION 8.4.6.1 i.
Condu,its representing Class lE installations shall be installed within two-inchs of the "Non-lE" tray.
Centerlines of conduit will be pe'rpendicular to the
.s, centerline of the cable tray.
j.
Class lE cable trays and rigid steel conduit will be supported with seismic' hangers (Unistrut) at maximum
?N
' 9 foot intervals.
Sealtite will be supported just beyond its coupling to a length of rigid steel conduit.
k.
Power cable test configuration is shown in Figure 1.
The control cable configuration is shown in Figure 2.
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