ML20082E329
| ML20082E329 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 07/25/1991 |
| From: | William Cahill, Woodlan D TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CP-89-030, CP-89-30, TXX-91260, NUDOCS 9107310357 | |
| Download: ML20082E329 (2) | |
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. s psmKwMettows MM Log # TXX-91260 File # 10110 910.4 r
C Ref. # 10CFR5055(e) 1UELECTRIC July 25, 1991 William J. Cahm, Jr.
buusm ske fyrsans U. S. Nuclear Regulatory Commission ATTH: Document Controi Desk Washington, D. C. 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)-UNIT 2 DOCKET NO. 50-446 AFW PUMP TURBINE LOW LUBE OIL PRESSURE SWITCH SDAR:
CP-89-030 (FINAL REPORT UNIT 2)
Ref:
TV Electric letter logged TXX-89820 from W. J. Cahill, Jr. to NRC dated November 27, 1989 Gentlemen:
On October 27, 1989 TU Electric notified the NRC of a deficiency involving Auxiliary Feedwater (AFW) pump turbine low lube oil pressure switch electrical separation. On November 27, 1989, in the final 50.55(e) report submitted for Unit 1, TV Electric stated that the Unit 2 corrective action for this deficiency woul'1 be assessed af ter resumption of the balance of engineering activities for Unit 2.
As in Unit 1, the Unit 2 AFW pump turbine low lube oil pressure switch is part of the seismically qualified AFW Pomp Turbine skid, and is provided with single fuse isolation from the skid IE power supply.
The Unit 2 switch, as the Unit I switch, was determined to not meet the CPSES electrical separation design criteria. The corrective action assessed for Unit 2 is similar to that implemented for Unit 1 and is as follows:
The design has been modified to provide two fuses in series in the AFW pump turbine low lube oil pressure switch power supply circuit.
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TXX-91260 Page 2 of 2 The revised fuse configuration meets the CPSES electrical separation criteria for Regulatory Guide 1.75 isclation requirements. The hardware modification will be completed prior to Unit 2 fuel load.
Sincerely William J. Cahill, Jr.
By:
O. R. Woodlan Docket Licensing Manager JDR/RHS/grp c-Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (2)
Mr. M. B. Fields, NRR
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