ML17164B033
| ML17164B033 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 05/04/1999 |
| From: | Nerses V NRC (Affiliation Not Assigned) |
| To: | NRC (Affiliation Not Assigned) |
| References | |
| TAC-MA4293, TAC-MA4294, NUDOCS 9905100093 | |
| Download: ML17164B033 (5) | |
Text
May 4, 1999 MEMORANDUMTO: Docket File FROM:
SUBJECT:
Original signed by:
Victor Nerses, Senior Project Manager, Section 1
Project Directorate I
Division of Licensing Project Management Office of Nuclear Reactor Regulation SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1 AND 2, DRAFT'EQUEST FOR ADDITIONALINFORMATION,EMERGENCY DIESEL GENERATOR DAYTANKCAPACITY(TAC NOS. MA4293 AND MA4294)
The attached request for additional information (RAI) was transmitted by facsimile on May 4, 1999, to M. Crowthers of PP&L, Inc. Review of the RAI would allow the licensee an opportunity to clarify their understanding of the staff questions and agree upon a schedule to respond to the RAI. This memorandum and the attached do not convey a formal request for information or represent an NRC staff position.
Docket Nos. 50-387 and 50-388
Attachment:
As stated DISTRIBUTION:
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information or represent an NRC staff position.
Docket Nos. 50-387 and 50-388
Attachment:
As stated It
'ctor Nerses, Senior Project Manager, Section 1
Project Directorate I
Division of Licensing Project Management Office of Nuclear Reactor Regulation
SUBJECT:
SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1 AND 2, DRAFT REQUEST FOR ADDITIONALINFORMATION,EMERGENCY DIESEL GENERATOR DAY'TANKCAPACITY(TAC NOS. MA4293 AND MA4294) 1 I
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l'he attached request for additional information (RAI) was transmitted by facsimile on n
1 1
May 4, 1999, to M. Crowthers of PP&L, Inc. Review of the RAI would allow the licensee an opportunity clarify their understanding of the staff questions and agree upon a schedule to 1
respond to the RAI. This memorandum and the attached do not convey a formal request for
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<v REQUEST FOR ADDITIONALINFORMATIONFOR TECHNICALSPECIFICATION CHANGE REQUEST RELATED TO EMERGENCY DIESEL GENERATOR DAYTANKCAPACITY SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1 AND 2 DOCKET NOS. 50-387 AND 50-388 1.0 Each day tank for EDGs A, B, C and D has a capacity of 550-gallon. The day tank for EDG E has a capacity of 650-gallon.
In April 1991, Pennsylvania Power and Light Company (PP8 L) performed an engineering study (SEA-ME-332) in response to the staffs concerns identified during an Emergency Diesel Safety Function Inspection (EDSFI) regarding day tank minimum volume requirement calculations.
Results of the engineering study indicated'hat in order to satisfy the requirements described in ANSI N195-1 976, a minimum of 461 gallons are required to be maintained in each of the day tanks for EDGs A, B, C, and D and 528 gallons for EDG E. During a conference call on April 16, 1999, PP8L staff stated that based on the latest calculation a minimum of 499 (in stead of 461) gallons are required to be maintained in each of the day tanks for EDGs A, B, C, and D and 446.5 (instead of 528) gallons are required to be maintained in the day tank for EDG E. Provide the following information:
a.
Detailed calculations of the minimum usable fuel oil (in gallons) required to be stored in each of the day tanks.
Information should include all input parameters (e.g., EDG fuel oil consumption rates, level switch setpoints, etc.) and justifications for assumptions.
R b.
EDG E has a higher rating than EDGs A, B, C, and D (5000 kw vs 4000 kw), provide detailed discussion to show why (in the latest calculation) EDG E requires less fuel oil than EDGs A, B, C and D to satisfy the requirements described in ANSI N195-1976. Also, discuss why more (499 gallons vs 461 gallons) fuel oil is required for EDGs A, B, C, and D, and less (446.5 gallons vs 528 gallons) fuel oil for EDG E when compared with the previous calculations.
2.0 In page 1 of Attachment 1 and page 1 of Attachment 2 to PLA-5007, PP8L stated that the proposed volumes (420gallons for EDGs A, B, C and D and 425 gallons for EDG E) are sufficient to operate the EDGs for a minimum of 55 minutes at 100% of the EDG continuous rated load, and are equivalent to the levels at which fuel oil is automatically replenished.
In page 3 of Attachment 1 to PLA-5007, PP8L stated that all EDG day tanks are automatically refilled when the day tank level drops to a level that willsupport 55.6 minutes of operation for EDGs A, B, C, and D and 62 minutes of operation for EDG E at continuous rated loads.
Please provide detail discussions to clarify the above inconsistences.
See page 4 in the Report Details of the NRC Special Inspection Report (50-387/98-08, 50-388/98-08) dated August 6, 1998.
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