ML20076C401
| ML20076C401 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/17/1983 |
| From: | Tauber H DETROIT EDISON CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| EF2-64-548, NUDOCS 8308220348 | |
| Download: ML20076C401 (6) | |
Text
.
Harry Tauber Group Vco President Detroit Edison E054=-
August 17, 1983 EF2 - 64,548 Director of Nuclear Reactor Regulation Attention: Mr. B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Youngblood:
Reference:
Enrico Fermi Atomic Power Plant, Unit 2 NRC Docket No. 50-341
Subject:
Standby Liquid Control System In response to your letter dated June 22, Detroit Edison rep-resentatives met with members of your staff on July 7 in Bethesda, Maryland.
Detroit Edison presem ed additional information which described the Fermi 2 Standby Liquid Control System (SLCS) power supplies, compared them to the power supplies for this system at the Dresden Units 2 and 3, and showed the two systems were function-ally identical. Copies of the information presented are attached.
Consistent with the discussions for resolution of this matter, Detroit Edison is willing to commit to the following:
1.
Perform a QA/QC audit on all terminations of the SLCS instru-mentation, control and power cables associated with the injection of the boron solution.
2.
Provide the results of the high voltage tests of the cables cited above to the NRR Staff.
3.
Perform a design drawing review of the cables feeding off MCC 72B-4C and MCC 72E-5B to determine whether any of these cables could be affected by a common fault.
8308220348 830817 PDR ADOCK 05000 g
'If
a B. J. Youngblood August 17, 1983 EF2 - 64,548 Page 2 4.
Review the SLCS design and construction documentation plus walkdown the SLCS in the plant to verify that the system is designed and constructed to high quality standards.
t 5.
Subsequent to the satisfactory completion of the startup testing of the SLCS (currently in progress), Detroit Edison commits to apply the same QA controls and procedures to SLCS components necessary for the injection of boron as would be applied to safety related components at Fermi 2.
This i
includes MCC 72B-4C and MCC 72E-5B.
It is understood, however, that the SLCS electrical components were not originally intend-ed, procured, designed, or classified as safety related as the term implies today.
6.
Propose an amendment to the draft Fermi 2 Technical Specifica-tions for surveillance of electrical isolation devices assoc-lated with the SLCS.
We believe these commitments are responsive to the resolution basis
' discussed in the meeting.
If you have any further questions, please contact Mr. Larry E.
Schuerman (313) 586-4207.
Sincerely, pm /wf
/
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j cc: Mr. P. Byron j/
Mr. M. D. Lynch l
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4 DRESDEN UNITS 2 & 3 STANDBY LIQUID CONTROL POWER SUPPLIES r
To 345 kV h h To 120 k Saitchyard Switchya Standby Standby Diesel Gen Diesel Gen 2/3 2
]
U b
4160 v.
Bus 23-1 4160 v.
Bus 24-1 O
O J.),)s I'
]
Transformer 28 Transformer 29.
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P (' }
[3 ir j 480 V.
Swgr. 28 480 V.
Swgr. 29 0
0 480 v.
MCC 28 - 1 Mccs are 480 V.
MCC 29 - 1 i
" Safety-Related".
k Pump 1102A Pump 11028
i ENRICO FERMI UNIT 2 STANDBY LIQUID CONTROL POWER SUPPLIES n
A To 120 kV To 345 kV Snitchyard Switchyard EDG 11 EDG 13 Q
O O
O O
4160 kV Bus 64 8 4160 kV Bus 65 E O
O WL 1.,Q Transformer 72 B Transformer 72 E TT T
480 V.
Bus 72 B 480 V.
Bus 72E O
O 480 V.
MCC 72 B-4C MCCs are purchased 480 V.
MCC 72 E-5B to the same spec as 1E, jy except for documentation.
jf v
O ) Pump A Pump B
4 AS PRESENTLY DESIGNED, FERMI 2 SBLC HAS THE FOLLOWING FEATURES:
- 1. The pump motors are restored from the EDGs.
- 2. Motor Control Centers feeding motors are seismically qualified.
They, along with the other referenced MCCs, were purchased on the same purchase order as the Class 1 MCCs, to the same specification with minor exceptions.
- 3. BOP cable is purchased identical to Class 1 but with black jacket.
The trays and conduits are seismically hung.
4.
Heaters and heat trace can be manually restored.
Alarms are automatically restored to indicate a problem.
I
STANDBY LIQUID CONTROL ELECTRICAL SYSTEM COMPARISON DRESDEN FERMI 2 Motors, heat trace, tank Motors fed from diesel heaters, and control fed restorable 72B - 4C and from MCC's 28-1 (Div 1) 72E - SB.
40 kW heater and 29-1 (Div 2).
Both fed from 72E - SB.
10 kW diesel restorable.
heater fed from 72C - 4A.
Heat trace is fed from I.
72B - 4A and 72E - 4B.
All of the above MCCs were purchased on the same P. O.
as Class 1 MCCs.
t' Cables from both power Same as Dresden.
sources are in common tray near SBLC.
Single operating switch Same as Dresden, for both pumps.
" Bubbler" system used for tank Same as Dresden. For level indication, pressure measurement,-Fermi uses GMAC pressure transmitter, the same type used for many Class 1 applications.
SBLC Motors: Standard I
GE Supplied.
Same as Dresden.
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