ML20198R501
| ML20198R501 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/05/1986 |
| From: | Nauman D SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8606100094 | |
| Download: ML20198R501 (4) | |
Text
gth, Car,oglna Electric & Gas Cornpany Dan N n
urn a 29218 Nuclear Operations SCE&G June 5, 1986 Mr. Harold R. Denton Director, Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D. C.
20555
SUBJECT:
V. C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Appendix R "M" Board Barrier
Dear Mr. Denton:
In a letter from Mr. O. W. Dixon, Jr. dated September 20, 1985, South Carolina Electric and Gas Company (SCE&G) supplied additional information to your staff on the Service Water Booster Pump "M" board fire barrier. As indicated in the Attachment to that letter, the implementation of the proposed modification, to add additional protective material around the barrier supports, was dependent upon successful completion of the structural evaluation to ensure the barrier could withstand a seismic event.
Subsequent to the initial design, information was supplied by Thermal Science, Inc. (TSI) identifying an increase in weight of the new protective material over that originally published by TSI. As a result of increased weight, a reevaluation was performed. The results of this evaluation indicated that the barrier supporting system must be upgraded to accommodate the additional weight of the protective enclosure. Due to this design change, the original estimated completion date of 2nd Quarter 1986 is being rescheduled to ist Quarter 1987.
The design effort for this modification is near completion and the fire barrier material is on site; however, the design changes, and the complexity of installing the modification has caused us to extend our completion date for the modification. The delay in implementation of this modification has a negligible impact on risk to the public since the compensating action, a roving fire watch, will remain in place until the modification is complete.
An updated Schedule of Modification Implementation is attached. By copy of this letter, the schedule has been forwarded to the Region II principal fire inspector as a status report on our Appendix R reanalysis / modifications.
bDo 00 i
Mr. Harold R. Denton Page 2 June 5, 1986 Any questions you may have concerning this information should be directed to Mr. Hal Donnelly at (803) 345-2201, ext. 4154.
h 1 b.
V r yours,
.g
\\
W man HID/0AN:1cd Attachment pc:
- 0. W. Dixon, Jr./T. C. Nichols, Jr.
E. H. Crews, Jr.
E. C. Roberts W. A. Williams, Jr.
O. S. Bradham D. R. Moore Group Managers C. A. Price R. M. Campbell C. L. Ligon (NSRC)
W. T. Frady G. G. Putt K. E. Nodland R. A. Stough J. B. Hopkins K. S. West R. L. Prevatte P. M. Madden J. B. Knotts, Jr.
I & E Washington NPCF File 15.1360 1
TABLE 14.0 PAGE 1 0F 2 REVISION 2 ATTACHMENT TO LETTER FROM D. A. NAUMAN TO H. R. DENTON, V. C. SUMMER NUCLEAR STATION APPENDIX R "M" BOARD BARRIER SCHEDULE OF MODIFICATION IMPLEMENTATION MRF DESCRIPTION NRC AUDIT REPORT OUTAGE SCE&G CONST.
t
SUMMARY
OF ITEM #
REQ.
COMPL. DATE*
COMPENSATORY ACTION ggy,
395/85-26-02 Add 2nd power disconnect for air operated Yes 3rd Refueling Interim Wire Cutting Procedure Para. 5.a(1)(a) valves 20784 (2nd Qtr. '87) thru 5.a(1)(e) 395/85-26-02 Add Thyrite protectors to current No Complete Para. 5.a(1)(g) transformers 20785 496/85-26-02 Add Fire Switches to 480V switchgear Yes 3rd Refueling Interim Jumper Procedure Para. 5.a(1) 20786 (2nd Qtr. '87) 395/86-26-02 Upgrade DG-8 Controls Yes Complete Para. 5.a(1)(f) 20788 395/85-26-02 Add Fire Switch to 7.2kV switchgear Yes 3rd Refueling Interim Jumper Procedure Para. 5.a(1) 20789 (2nd Qtr. '87) 395/85-26-02 Upgrade Fire Switch for S.W. Pp. "B" and Yes 3rd Refueling Roving Fire Watch Para. 5.a(1) add Fire Switch for C.C. Pp. "B" 20790 (2nd Qtr. '87) 395/85-26-02 Upgrade Chiller B Contr. Transfer Switch Yes 3rd Refueling Interim Jumper Procedure Para. 5.a(1) 20791 (2nd Qtr. '87) 395/85-26-02 Armor cables for solenoid valves Yes 3rd Refueling Interim Wire Cutting Procedure Para. 5.a(1)(a) 20800 (2nd Qtr. '87) and 5.a(1)(e) 20784 395/85-26-02 Change RC Loop Th/Tc instrumentation to one Yes 3rd Refueling Operational Procedure Para. 5.a(1)(h) power train per loop 20801 (2nd Qtr. '87) 395/85-26-02 Renumber cables DGM218 and DGM228 from No Complete Para. 5.a(1)(f) tower cable spreading room 20788 395/85-26-12 Install additional self-contained emergency No 2nd Qtr. '86 Existing Emergency Lighting lighting units 20840 Supplemented by Hand Held Lighting These are tentative and subject to change as detailed planning proceeds.
t A plant wide special roving fire watch remains in effect.
TABLE 14.0 PAGE 2 0F 2 REVISION 2 ATTACHMENT TO LETTER FROM D. A. NAUMAN TO H. R. DENTON, V. C. SUMMER NUCLEAR STATION APPENDIX R "M" BOARD BARRIER SCHEDULE OF MODIFICATION IMPLEMENTATION MRF DESCRIPTION NRC AUDIT REPORT OUTAGE SCE&G CONST.
t
SUMMARY
OF ITEM #
REQ.
COMPL. DATE*
COMPENSATORY ACTION MRF #
395/85-26-04 Wrap conduits for NI-3131968 No Complete 395/85-26-08 Additional of direct reading level guage No 4th Qtr. '86 Roving Fire Watch for RWST 20579 4
395/85-26-05 Revision of power circuit breaker Yes Complete overcurrent settings for coordination 20784 395/85-26-02 Add fire switches to 480V MCC's, XFN-45A-Yes 3rd Refueling Interim Jumper Procedure AH, XFN-458-AH, XFN-468-VL, XFN-808-VL (2nd Qtr. '87) 20896 395/85-26-03 Wrap Tray 3088 31971 No Complete 395/85-26-16 Upgrade Service Water Booster Pump "M" Yes 3rd Refueling Roving Fire Watch i
Board Barrier (supports)
(2nd Qtr. '87) 20895 l
395/86-26-02 Change M.S. PORV control logic to pre-1980 No 4th Qtr. '86 Interim Wire Cutting Procedure design (IPV-2000, 2010, 2020-MS) 20784 20995 N/A Upgrade the FPER No 2nd Qtr. '86 N/A N/A Rewire power supplies for the diesel Yes 3rd Refueling Roving Fire Watch generator shutdown logic circuitry (2nd Qtr. '87)
(deviation)
N/A Seal openings between fire zones IB-25.1 No 4th Qtr. '86 Roving Fire Watch and 18-25.6 (deviation) 1 These are tentative and subject to change as detail ? olanning proceeds.
t A plant wide special roving fire watch remains in effec.
.