ML14176A417
| ML14176A417 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 10/31/1988 |
| From: | Lo R Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8811040094 | |
| Download: ML14176A417 (7) | |
Text
October 31, 1988 DISTRIBUTION See attached sheet Docket No. 50-261 LICENSEE: CAROLINA POWER & LIGHT COMPANY FACILITY: H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2
SUBJECT:
MEETING
SUMMARY
OF OCTOBER 20 - 21, 1988 MEETING ON ISSUES RELATED TO THE ELECTRICAL SYSTEM, H. B. ROBINSON, UNIT NO. 2 Meetings between the NRC staff and representatives of Carolina Power & Light Company (CP&L) were held on October 20 and 21, 1988 to discuss issues related to the electrical system at H. B. Robinson Steam Electric Plant, Unit No. 2 (HBR-2). The meeting agenda (Enclosure 1) and the list of attendees (Enclosure
- 2) are enclosed. During the meeting, the attendees reached certain conclusions on the agenda items. These conclusions are summarized in the following:
- 1. Testing of the Molded Case Circuit Breakers (MCCB)
CP&L committed to the testing of the MCCB instantaneous and thermal overload trip elements during every refueling outage. The first of these tests will be performed during the upcoming 12th refueling outage (the Outage) scheduled to begin on November 15, 1988. Within 60 days following the Outage, CP&L will submit proposals to incorporate the appropriate surveillance tests in the HBR-2 Technical Specifications (TS).
The staff finds the CP&L commitments adequate to resolve the concerns regarding the testing of the MCCBs.
- 2. Modification of the 480 Volt DB-50 Circuit Breakers CP&L committed to upgrade the DB-50 circuit breakers (22) to assure adequate current interrupting capability. CP&L is completing an engineer ing study on the modification and the most likely method for upgrade would either be the installation of current limiting fuses or load banks. The concept of the load banks, however, does not appear to be practicable.
CP&L stated that, depending on the decision on the modification method, completion is expected during the 13th refueling outage scheduled for 1990. In any case, CP&L is committed to make good faith efforts to expedite the completion of the modification in 1990 and in no case, later than 1991. CP&L will inform the staff of its decisions which is expected within 30 days. Pending the CP&L decision on the modification method and schedule, the staff finds the planned resolution to the adequacy of the 480 volt DB-50 breakers issue to be acceptable.
811040094-8101 T
PDR ADOCK 05000261 P
PDC 1
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- 3. Adequacy of the Station Battery Duty Cycle
- a. CP&L will provide the staff, with revised calculations using the methodology of IEEE-485 to demonstrate the adequacy of the B-battery for one-hour duty cycle. In addition, CP&L will perform capacity discharge tests during the Outage according to the IEEE 450 surveillance recommendations to ascertain the remaining battery capacity. The test results which should demonstrate the adequacy of the B-battery for one-hour duty cycle along with a TS change request to incorporate surveillance requirements modelled after the Standard TS will be submitted to the staff within 45 days following the Outage.
- b. Within 90 days, CP&L will provide TS change proposals to incorporate limiting conditions for operation and surveillance requirements for the battery chargers.
- c. CP&L is evaluating the adequacy of present station battery duty cycles for compliance with the Station Blackout Rule (SBO). CP&L will submit this information as required by 10 CFR 50.63 by April 1989.
- 4. Station Electrical Distribution System Voltages (SEDSV)
CP&L is scheduled to complete by January 31, 1989, and will provide to the staff a comprehensive study to address the adequacy of SEDSV at HBR-2.
This study will also include a validation of previous voltage-drop studies and a determination of whether the previous conclusions on the adequacy of the station electrical system voltages (MPA B-48 issues) are still valid. The study will include documented assumptions and address all electrical modifications since the resolution of the issue in May, 1984.
In addition, as part of the electrical design basis reconstitution effort, CP&L will re-assess the adequacy of the Emergency Diesel Generator capacity by considering all pertinent electrical loads and their load values based on actual pump curves. Also, the adequacy of the present degraded grid voltage level (412 volts) and the recently identified cable ampacity issue will be re-evaluated. The results of these studies will be submitted to the staff when completed.
- 5. Final Configuration of Safety Injection (SI) Pump B CP&L intends to perform modifications during the Outage such that SI pump B can be used as a maintenance spare pump for either SI pump A or C.
The SI pump 8 will be manually aligned as required. Circuitry, controls and procedure will be in place following the Outage such that the SI pump B can be used as a spare SI pump. When the SI pump B is manually substi tuted for either the SI pump A or C, it will be capable of automatically starting upon an SI signal. The modification package and appropriate TS changes will be submitted for staff review and approval within 60 days.
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- 6. Emergency Diesel Generator (EDG) Fuel Capacity Within 30 days, CP&L will submit a TS change request to incorporate requirements to ensure a seven day supply (32,000 gallons) of diesel fuel on-site for the EDG. The staff also advised CP&L that the entire inventory (both the Category I and non-seismically qualified storage tanks) of diesel fuel is subject to sampling requirements per TS.
- 7. Current Interrupting Capability of 480 Volts MCCBs.
During the Outage, CP&L will complete the upgrade of the current 14,000 amps interrupting capability of the MCCBs for the motor control centers 5,6,9 and 10 to 22,000 amps. CP&L will forward the staff a letter describing the modification within 30 days. Pending receipt and review of the information, the staff expects the resolution of the this issue to be acceptable.
Ronnie H. Lo, Senior Project Manager Project Directorate II-1 Division of Reactor Projects I/II
Enclosures:
As stated cc w/enclosures:
See next page
- See previous concurrence OFC
- PM:PD21:DRPR:SELB
- SELB
- D:PD21:DR NAME :R. Lo:jfw
- P. Kang *
- D. Tondi
- E. Ad DATE :10/
/88
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/88
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/88
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/ 8 OFFICIAL RECORD COPY
Mr. E. E. Utley Carolina Power & Light Company H. B. Robinson 2 cc:
Mr. R. E. Jones, General Counsel Mr. Dwayne H. Brown, Chief Carolina Power & Light Company Radiation Protection Branch P. 0. Box 1551 Division of Facility Services Raleigh, North Carolina 27602 Department of Human Resources 701 Barbour Drive Raleigh, North Carolina 27603-2008 Mr. McCuen Morrell, Chairman Darlington County Board of Supervisors Mr. Robert P. Gruber County Courthouse Executive Director Darlington, South Carolina 29535 Public Staff -
NCUC P.O. Box 29520 Mr. H. A. Cole Raleigh, North Carolina 27626-0520 Special Deputy Attorney General State of North Carolina Mr. C. R. Dietz P.O. Box 629 Manager, Robinson Nuclear Project Raleigh, North Carolina 27602 Department H. B. Robinson Steam Electric Plant Mr. D. E. Hollar P. 0. Box 790 Associate General Counsel Hartsville, South Carolina 29550 Carolina Power and Light Company P.O. Box 1551 Raleigh, North Carolina 27602 U.S. Nuclear Regulatory Commission Resident Inspector's Office H. B. Robinson Steam Electric Plant Route 5, Box 413 Hartsville, South Carolina 29550 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street Suite 2900 Atlanta, Georgia 30323 Mr. R. Morgan General Manager H. B. Robinson Steam Electric Plant Post Office Box 790 Hartsville, South Carolina 29550 Mr. Avery Upchurch, Chairman Triangle J Council of Governments 100 Park Drive Post Office Box 12276 Research Triangle Park, NC 27709.
J
- 1.
.ENCLOSUR 1
CP&L/NRR MEETING ELECTRICAL ISSUES OCTOBER 20-21, 1988 RALEIGH, NC AGENDA I. INTRODUCTIONS II. PURPOSE, BACKGROUND AND AGENDA REVIEW III. PRIMARY AREAS OF DISCUSSION A. MOLDED CASE CIRCUIT BREAKER TESTING AFW ABT ISSUE B. DB-50 CIRCUIT BREAKER MODIFICATION SSFI ISSUE C. BATTERY DUTY CYCLE SSFI ISSUE D. STATION ELECTRICAL DISTRIBUTION SYSTEM VOLTAGE ADEQUACY NRC RAI DATED JANUARY 13, 1988 IV. OTHER ISSUES FOR DISCUSSION A. SI PuMP B FINAL CONFIGURATION B. EDG FUEL CAPACITY -
TS AND FSAR UPDATE C. OTHER MCCB INTERRUPTING CAPABILITY D. ELECTRICAL SYSTEM DBD OVERVIEW V. CONCLUSION/FINAL COMMENTS
e 0
ENCLOSURE 2 CP&L/NRR MEETING ELECTRICAL ISSUES OCTOBER 20-21, 1988 RALEIGH, NORTH CAROLINA ATTENDEE UTILITY R. Lo NRC/NRR D. Tondi NRC/NRR/DEST/SELB P. J. Kang NRC/NRR/SELB W. W. Price, Jr.
CP&L/NED J. M. Curley (Note 1)
CP&L/Robinson B. M. Hynds CP&L/NED L. Loflin (Note 3)
CP&L/Nuc. Lic.
B. Prunty CP&L/Nuc. Lic.
J. Deitrick (Note 2)
CP&L/NED M. Marshall (Note )
CP&L/ Nuc. Lic.
R. Sanders (Note 3)
CP&L/NED A. Cutter (Note 2,3)
CP&L/NED Note 1 10/20 only Note 2 10/21 only Note 3 part time
DISTRIBUTION FOR MEETING
SUMMARY
DATED:
October 31, 1988 Facility: H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2*
.Docket Fie NRC PDR Local PDR PDHI-1 Reading G. Lainas E. Adensam P. Anderson R. Lo OGC E. Jordan (MNBB 3302)
B. Grimes (9A2)
P. Kang (8D20)
D. Tondi (8020)
A. Gibson (Region II)
ACRS (10)
B. Troskoski (17019) cc:
Licensee/Applicant Service List