ML20070L816
| ML20070L816 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/13/1991 |
| From: | Cottle W ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GNRO-91-00041, GNRO-91-41, NUDOCS 9103200268 | |
| Download: ML20070L816 (7) | |
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d i March 13, 1991 U.S. Nuclear Regulatory Commission Mail Station P1-137 Washington, D.C.
20555 Attention:
Document Control Desk
SUBJECT:
Grand Gulf Nucicar Station Unit 1 Docket No. 50-416 License No. NPF-29 Removal of Battery Load Profile Requirements Request for Additional Information on PCOL-90/11 GNRO-91/00041 Gentlemet.
By letter dated January 28, 1991 (GNRI-91/00017) the staff requested additional information in order to complete its review of our proposed change to the Grand Gulf Nuclear Station (GGNS) Operating License dated January 11, 1990 (GNRO-91/00004).
The proposed change requested deletion of the Division I, II and III 125 VDC battery load profiles from GGNS Technical Specification 4.8.2.1.d.2.
The change had been discussed with the staff at a meeting on November 6,1990 and modeled af ter a similar change recently granted to Alabama Power Co. (Joseph M. Farley Nuclear Plant) on October 1, 1990.
Previous to the amendment request, GGNS had reported, pursuant to 10CFR30.73 (LER 90-012-00 dated August 23, 1990; AECM-90/0151) a condition in which the Division III 125 VDC battery load profile currently described 17 the TS is non conservative when compared with the actual emergency load profile during the 1-60 minute time interval.
As corrective action, GGNS immediately corrected the load profile, verified the batteries' capacity to deliver the energy and successfully performed TS surveillance 4.8.2.1.d.2.c using the corrected profile to demonstrate operability.
A bounding profile was provided to the staff in LER 90-012-00 and incorporated into Revision 5 to the Updated Final Safety Analysis Report (UFSAR) which was submitted to the staff via AECM-90/0208, dated December 1, 1990. The changes to the Division III load profile associated with this condition were evaluated under the l
provision of 10CFR 50.59.
In response to the staff request, the attachment to this letter provides our response to those questions pertaining to the Division III load calculations.
G9102281/SNLICFLR - 1
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9103200268 910313 PDR ADOCK 05000416 P
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March 13, 1991 l
l GNRO-91/00041 Page 2 of 3 i
i The staff also requested that GGNS provide an analysis about the issue of no significant hazards consideration (NSHC) for the change in the Division III battery load profile. The changes proposed in the January 11, 1990 application involved the deletion of the Division I, II, and III DC battery load profiles because they are also contained in the UFSAR. An evaluation of the NS!!C associated with the relocation of thu battery profiles was provided with that appl Pation. GGNS, therefore, is proposing no change to the original application or the NSilC contained in the original application.
-If you require additional information, please advise, f
Yours truly, p F Ne WTC/J0F/ams attachment:
cc:
Mr. D. C. Hintz (w/a)
Mr. J. Mathis (w/a)
Mr. R. B. McGohee (w/a)
Mr. N. S. Reynolds (w/a)
Mr.11. L. - Thomas (w/o) i Mr. Stewart D. Ebneter (w/a)
Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta,. Georgia 30323 l
Mr. L. L. Kintner, Project Manager (w/a) l Office of Nuclear Reactor Regulation l-U.S. Nuclear Regulatory Commission l
Mail Stop 11D21
)
l Washington, D.C.
20555 f
i G9102281/SNLICFLR - 2
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..S Attachment' to GNRO-31/00041 Page 1 of 5 GGNS1 RESPONSE TO NRC REQUEST FOR ADDITIONAL INFORMATION:
The responseLto quest'ons'1, 2 and 3 below are based on
--Calculations.EC-Q1L21-90020 and EC-Q1L21-90023.
These calculations were reviewed in detail by the.NRC Region II team i
-during-the-Electrical' Distribution System Functional Inspection
'(EDSFI)' conducted ~at GGNS during three visits spanning November 114 to DecemberL14,-1990.
The team' concluded that the ratings of the batteries and chargers were compatible with the present
-loading, for all analyzed conditions.
Question 1:
. Provide a detailed description of the " design duty cycle" for this: battery including a tabulation of all the continuous and momentary l loads,.their~ duration, and when they occur during the
~ design _ duty'cyclei Resoonse:
' Nuclear Plant. Engineering Calculation:EC-Q1L21-90020 Revision 1 identifies'thetloads fed from the division III 125 VDC: battery thatLwill-be required to operate under concurrent Loss of Off-
. wite - Power- (LOP) and Loss of Coolant Accident (LOCA)- conditions.
'These loads are summarized and presented below in a tabulated
- f o rm. _
-Note'that.during the-first minute, the loads listed below occur l
sequentially in such'a manner-that the maximum demand on the battery.fis equal to 61~.271TAmperes 7r.less.
Load-Description-O Evaluescshown--below do-not_necessarilycreflect-total-connected 11oadsifor.each~ category, but do represent?the load' requirement:
for each categoryoduring the maximum: demand' period-(approximately the firstLsecond'of the 0 - 60 second period).
Periodt.
0 - 60: Seconds q
Load De'scriotion Load' '( Amos)
Breaker-loadsL(HPCS, DG & ESF 12) 6.000
. Trip Coils L
- Close Coils L
- Spring Charging Motors
- Miscellaneous l-
' Load for each category'during maximum demand period.
Attachment to GNRO-91/00041 Page 2 of 5 Diesel Generator Loads 46.364
- Field Flashing
- DG Relays
- DG Solenoids
- Fuel Pumps (Inrush & Steady State)
Miscellaneous Loads 8.907
- Monitoring
- Annunciation & Indication
- Control
- Alarming (Audible)
- Miscellaneous Total Load (Amperes) 61.271 Periodt 60 Seconds - 60 Minutos Load Descriotion Load (Amos)
Miscellaneous Steady State Loads 8.365
- Monitoring (Relays, etc.)
- Annunciation & Indication (Bulbs, etc.)
- Control (Relays, etc.)
- Alarming (Horns, etc.)
- Miscellaneous Diesel Generator Steady State Loads 9.08
--Fuel Pumps
- Relays
- Miscellaneous Total Load (Amperes) 17.445 Periodt
-60 Minutes - 120 Minutea Load Descriotion Load (Amopl Miscellaneous Steady State Loads 8.36
- Monitoring (Relays, etc.)
- Annunciation & Indication (Bulbs, etc.)
- Cor. trol (Relays, etc.)
- Alarming (Horns, etc.)
- Miscellaneous
~
Attachment to GNRO-91/00041 Page 3 of 5 Diesel Generator Steady State Loads 9.08
- Fuel Pumps
- Relays
- Miscellaneous
' total Load (Amperes) 17.445 Ouestion 2:
Provide detailed battery capacity versus load calculations used to determine terminal voltage versus time encompassing the current load profile contained in the plant's Technical specifications and the new load profile contained in the plant's UFSAR.
Calculations should include assumptions utilized such as:
-aging factor, margin, minimum allowable terminal voltage.
(See IEEE Std 485-1983 for guidance.)
Resnonset The loads identified in question 1 are used by calculation EC-Q1L21-90020 Revision 1 to verify the adequate sizing of the Division III battery.
As discussed earlier, the load profile developed in calculation EC-Q1L21-90020 Revision 1 reflects continuous and momentary loads that the battery will be subjected to_under concurrent LOP and LOCA conditions for the period of the
. duty-cycle (time T=0 to T=120 minutes).
This is the basis for the revised load profile in the UFSAR.
The battery sizing calculation is performed using the guidance of IEEE 485-1978, " Recommended Practice For Sizing Large Lead Cell Batteries-for Generating Stations and Substations".-
Conservative assumptions including the appropriate temperature correction factor, aging factor, growth margin as well as the minimum cell voltage are utilized to calculate the required cell size.
This calculation verifies that the existing battery (C&D 3DCU--9) is
-adequately sized to meet the postulated emergoney power requirements.
The revised load profile in the UFSAR envelops the actual load profile for the division III battery as developed in calculation EC-Q1L21-90020 Revision 1.
Therefore, performing surveillance tests to the revised. load profile will adequately test the Division III battery.
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O Attachment to GNRO-91/00041 Page 4 of 5 Qggstion 3:
Provide a detailed discussion of the basis for the minimum battery terminal voltage determination.
Were all components /cablu ?.engths and sizes considered in that determination?
What was the limiting component / cable?
Resnonse:
Calculation EC-Q1L21-90023 Revision 1 performs a voltage drop study of the Division IIT 125 VOC bnttery.
The purpose of this calculation is-to verify thot Division III 125 VDC devices required to operate under concurrent LOP and LOCA conditions have at least the minimum operating voltage available at their terminals to enable them to perform their safety funation.
For operating components (as identified in calculation EC-Q1L21-90020 Revision 1), load information (load current, minimum
?
voltage rating, etc.) as well as path information (cable site, l'
length, resistanco, ambient temperature, etc.) are utilized to identify the available voltage at the device terminals.
These values are then compared to the respective device manufacturers' minimum operating voltages to verify the availability of adequato voltage.
Actual load and cable characteristics have been utilized to model the system.
The calculation-shows that under the postulated emergency I
conditions, the required components have the minimum voltage necessary available at their terminals to perform their design safety function, including consideration for end of life battery capacity, temperature, etc. as delineated in IEEE 485-1978, for the battery size utilized for the GGNS Division III system.
The NRC Region II EDSFI Team reviewed the calculation and verified that adequate battery terminal voltage will exist at the onset of a DBA.
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e Attachment to GNRO-91/00041 Page 5 of 5 Ouestion 4:
The proposed load profile is based on a LOCA with a loss of battery charger for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
How does this scenario loading relate to the battery's loading during a station blackout scenario?
Response
In accordance with the definition of a station blackout (SBO) as given in 10CFR50.2, the HPCS EDG may be assumed to be available during an SBO and in fact can be designated as an alternate power source, it desired.
Given that the HPCS EDG is available, power is thus provided to Division III ESF Bus without relying on the Division I.II batteries.
In the GGNS response to the SBO Rule (AECM-90/0060 dated March 3, 1990), no credit is taken for HPCS operation in conjunction with the SBO coping analysis.
Therefore, it was not necessary to evaluate any battery load profile changes to the values given in UFSAR Table'8.3-8 for a postulated SBO scenario.
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