ML17158B913
| ML17158B913 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 12/17/1996 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML17158B912 | List: |
| References | |
| NUDOCS 9701150278 | |
| Download: ML17158B913 (3) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 25555-0001 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO 162TO FACILITY OPERATING LICENSE NO.
NPF 14 AMENDMENT N0.133 TO FACILITY OPERATING LICENSE NO.
NPF 22 PENNSYLVANIA POWER 8L LIGHT COMPANY
~
ALLEGHENY ELECTRIC COOPERATIVE INC.
SUS UEHANNA STEAM ELECTRIC STATION UNITS 1
AND 2 DOCKET NOS. 50-387 AND 388
- 1. 0 INTRODUCTION By letter dated July 28,
- 1995, as supplemented October 25,
- 1995, and August 9, 1996, the Pennsylvania Power and Light Company (the licensee) submitted a
request for changes to the Susquehanna Steam Electric Station, Units 1 and 2, Technical Specifications (TSs).
The requested changes would revise the 250 volt DC profiles in the Technical Specifications for the two units to reflect new load profile calculations.
The October 25,
- 1995, and August 9, 1996 letters provided clarifying information that did not change the initial proposed no significant hazards consideration determination nor the Federal Re<eister notice.
2.0 BACKGROUND
Two Class 1E 250 Vdc subsystems are provided for each unit and identified as Division I and II.
The Division I 250 Vdc subsystem is provided with one 250 V battery bank, one load center, two equal capacity chargers, and motor control centers (MCCs).
The Division II 250 Vdc subsystem is provided with one 250 V battery bank, one distribution load center, one battery charger, and MCCs.
The Class 1E 250 Vdc battery banks consist of 120 Type LCR-25 cells,
. manufactured by Charter Power Systems.
Each Class 1E 250 Vdc battery bank is rated at 1800 ampere-hours (8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> to 1.75 V per cell at 77'F).
The Class lE 250 Vdc batteries supply power for portions of the high pressure core injection (HPCI) system, the reactor core isolation cooling (RCIC) system, and the safety parameter display system'(SPDS) power supplies.
They also. supply the main turbine emergency seal oil pump, reactor feed pump turbine emergency lube oil pumps, reactor recirculation motor-generator set emergency lube oil
- pump, and the, plant computer, which are not considered safety-related and do not perform any safety functions.
During a station black out (SBO) event, loads that are not required are manually shed at 30 minutes.
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The licensee installed larger horsepower motors due to concerns related to Generic Letter 89-10.
These larger motors resulted in higher loading on the batteries.
During this design modification, the licensee found that the previous calculations for the Class 1E 250 Vdc batteries had not taken into account temperature and aging effects.
- Also, some Non-Class lE loads on the Unit 2 250 Vdc batteries had been removed but the Technical Specification (TS) battery load profiles had not reflected this load reduction.
Therefore, the Class IE 250 battery load profiles were revised to reflect these changes and findings.
By letter dated July 28,
- 1995, Pennsylvania
& Light Company (PPEL) submitted a
proposed amendment to the Susquehanna Steam Electric Station Unit I and 2 TS.
The proposed changes would revise the Class 1E 250 Vdc battery load profiles in TS 4.8.2. 1(d)(2c) to reflect the new load profile calculations.
The licensee also provided additional information by letters dated October 25,
- 1995, and August 9, 1996.
- 3. 0 EVALUATION The Class lE 250 Vdc battery load profiles are used for surveillance testing and are to include the worst case loading plus margin.
This testing assures that the Class lE 250 Vdc batteries have sufficient stored energy to operate all required emergency loads for the times assumed in the analysis.
Load profiles were developed for the large break loss of coolant accident (LOCA), large break LOCA with HPCI or RCIC in pressure
- control, and SBO.
The load currents and timing for sequencing the loads on the Class lE 250 Vdc batteries were tabulated into discrete time segments for each of the events.
The maximum possible load profiles for each event were then developed by determining the maximum loads that could possibly start/operate simultaneously due to the predicted operating times of the connected equipment.
Composite battery load profiles were developed using the heaviest loaded discrete time segments from the maximum load profiles for each event.
The composite load profiles do not correspond to any single operating
- mode, however, these profiles envelope all the operating modes of the batteries.
These load profiles also take into account the loads that are manually shed at 30 minutes during an SBO event.
Hargins were then added to the composite load profiles to establish the proposed TS Class lE 250 Vdc battery load profiles.
As part of the evaluation, the staff reviewed Calculations EC-088-1008, "Battery 2D660 Load Profile," and EC-088-0506, "250 VDC - Battery and Battery Charger Sizing Calculation," dated July 1994 to determine that the capacity of battery is sufficient to supply the load profile and the capacity of the
.charger is sufficient to re-charge the battery.
The staff found errors in these calculations.
These errors did not have a big impact on the results of the calculation since sufficient margin was included in the original battery sizing.
However, the staff requested the licensee to recheck their sizing calculations for accuracy and submit them. for staff review.
After the review of a submittal dated August 9,
- 1996, the staff found that these calculations were satisfactory and the staff concluded that the Class lE 250 Vdc batteries and Class lE 250 Vdc battery chargers have been sized to handle the load profiles.
Calculations showed that the 120 cell, 12 positive plates per cell battery banks are sufficient to supply the proposed TS load profiles and to maintain at least 210 Vdc at the Class lE MCC corrected for temperature and aging.
It was also shown that the Class lE 250 Vdc battery chargers have sufficient capacity to re-charge the batteries from the proposed TS emergency discharge conditions to fully charged condition in 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> while continuing to supply the plant normal continuous loads.
On the basis of the above, the staff concludes that the proposed changes to the 250 Vdc battery TS load profiles are acceptable.
4.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Pennsylvania State official was notified of the proposed issuance of the amendments.
The State official had no comments.
5.0 ENVIRONMENTAL CONSIDERATION
The amendments change surveillance requirements.
The NRC staff has determined that the amendments involve no significant increase in the amounts, and no significant change in the types, of any effluents that may be released
- offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure.
The Commission has previously issued a
proposed finding that the amendments involve no significant hazards consideration, and there has been no public comment on such finding (60 FR 47622).
Accordingly, the amendments meet eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendments.
- 6. 0 CONCLUSION The Commission has concluded, based on the considerations discussed
- above, that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed
- manner, (2) such activities will be conducted in compliance with the Commission s regulations, and (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
D. Nguyen Date: December 17, 1996