ML20086K850
| ML20086K850 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 06/20/1995 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20086K845 | List: |
| References | |
| NUDOCS 9507200331 | |
| Download: ML20086K850 (4) | |
Text
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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20066-0001
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NOS. 170 AND 152 TO FACILITY OPERATING LICENSE NOS. DPR-70 AND DPR-75 PUBLIC SERVICE ELECTRIC & GAS COMPANY PHILADELPHIA ELECTRIC COMPANY DELMARVA POWER AND LIGHT COMPANY ATLANTIC CITY ELECTRIC COMPANY SALEM NUCLEAR GENERATING STATION. UNIT N05. 1 AND 2 DOCKET NOS. 50-272 AND 50-311
1.0 INTRODUCTION
By letter dated June 29, 1994, as supplemented August 8, 1994, and May 2, 1995, the Public Service Electric & Gas Company (the licensee) submitted a request for changes to the Salem Nuclear Generating Station, Unit Nos. I and 2, Technical Specifications (TS).
The requested changes would increase minimum volume of emergency diesel generator fuel oil contained in the Diesel Fuel Oil Storage Tanks at both units of the Salem station. The August 8, 1994 and May 2,1995, letters provided clarifying information that did not change the initial proposed no significant hazards consideration determination.
There are three emergency diesel generators (EDGs) for each unit at the Salem Generating Station (SGS).
Two EDGs are required for each unit to support and maintain safe reactor shutdown during the most limiting case (design basis) of loss-of-coolant accident (LOCA).
The EDG fuel oil storage and transfer system for each unit consists of two 30,000 gallon diesel fuel oil storage tanks
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(DFOSTs); two fuel oil pumps; three 550 gallon fuel oil day tanks; and associated piping, valves and instrumentation controls.
The fuel oil storage and transfer systems for EDGs were designed in such a way that fuel oil can be transferred from either storage tank to the day tank on each EDG. During the i
licensing applications for both units at SGS, a minimum of 20,000 gallons of l
fuel oil stored in each DFOST was determined to be sufficient fuel oil for 7 days of EDG continuous operation at full load following a LOCA, in accordance with the guidance described in IEEE-308. As a result of its self-assessment of the electrical distribution system (EDS) conducted on September 14, 1992 through October 23, 1992, at SGS, the licensee identified that due to the nonconservative assumptions used and the failure to account for the unusable tank volume (vortex, imperfection of fabrication and installation, etc.) in the original fuel oil calculation and instrument error, the above stated fuel oil inventory stored in each DFOST was not sufficient for 7 days of EDG continuous operation following a LOCA.
9507200331 950620 PDR ADOCK 05000272 P
. During the period between August 16, and Septeder 3,1993, a Nuclear Regulatory Commission (NRC) inspection team conducted an EDS functional inspection at SGS to supplement and follow up en the licensee's self-assessraent of the EDS. As repcrted in the inspection report, dated November 5,1993, the team's finding ccM:urred with the licensee's conclusion that each DFOST could not supply one EDG with sufficient fuel oil to operate it for 7 days at full load.
Consequently, the licensee proposed to increase the minimum fuel oil inventory stored in each DFOST from 20,000 gallons to 23,000 gallons and to use the fuel oil which is stored in the on-site 20,000 barrel (approximately 840,000 gallon) auxiliary boiler fuel oil storage tank (FOST) to provide makeup for the required minimum inventory of fuel oil for 7 days of EDG operation following a LOCA.
The proposed TS change will enable the current fuel oil storage system configuration (including the (OST and associated piping systems) at SGS to provide sufficient fuel oil for 7 days of EDG continuous operation following a LOCA.
In addition, the amendment also proposes to revise the Updated Final Safety Analysis Report description to reflect the fuel oil storage system capability at SGS.
2.0 TECHNICAL SPECIFICATIONS RELATED TO FUEL OIL INVENTORY RE0VIRED FOR EDG OPERATION FOLLOWING A LOCA 2.1 Existina TSs a.
TS Section 3.8.1.1 of both units, in part, requires that:
During plant operation at Modes 1, 2, 3 and 4, a common fuel storage system consisting of two storage tanks, each containing a minimum volume of 20,000 gallons of fuel, and two fuel transfer pumps, b.
TS Section 3.8.1.2 of both units, in part, requires that:
During plant operation at Modes 5 and 6, a common fuel storage system containing a minimum volume of 20,000 gallons of fuel, and a fuel transfer pump.
2.2 Proposed TSs The licensee proposed to replace the above existing requirements with the following:
a.
In TS Section 3.8.1.1 of both units:
During plant operation at Modes 1, 2, 3 and 4, a common fuel storage system consisting of two storage tanks, each containing a minimum volume of 23,000 gallons of fuel, and two fuel transfer pumps.
. b.
In TS Section 3.8.1.2 of both units:
During plant operation at Modes 5 and 6, a common fuel storage system containing a minimum volume of 23,000 gallons of fuel, and a fuel transfer pump.
3.0 EyALVATION The EDG fuel oil storage and transfer systems at SGS are classified as Nuclear Class 3, Seismic Class 1.
The transfer pumps are powered by independent Class lE A.C. sources.
Normal make-up to the DFOSTs is supplied via the FOST. The FOST piping and valves are classified as non-safety related, Seismic Class III up to the Seismic Class I tank inlet valve for each DFOST.
Emergency truck connections are also provided to allow refilling the DFOSTs from off-site sources.
These connections were originally classified as Seismic Class III, but have since been shown to meet the applicable stress analysis codes (USAS B31.1, 1967 and ANSI B31.1, 1977), including Seismic Class I criteria.
The licensee stated that with the combined fuel oil inventory stored in both DF0STs at the proposed TS limit there will be sufficient fuel oil to support i
two diesel generators, operating at the most limiting load profile following a LOCA, for approximately 4.5 days. Operation of the diesel generators beyond i
this time will require that fuel oil be added to the DFOST from either the FOST or from an off-site source.
Fuel oil in the FOST and DFOSTs is periodically sampled and tested.
The licensee stated that the emergency and abnormal operating procedures for loss of power transients will be revised to include a step to initiate DFOST level verification and F0ST transfer as required by the system operating procedures.
If the F0ST and/or transfer piping cannot be used to supply fuel oil to the DFOSTs, the Shift Supervisor would be notified so that arrangements for obtaining fuel from one of the licensee's fuel oil vendors can be initiated by the emergency response team.
In addition, the licensee stated that to provide additional assurance of on-site EDG fuel oil inventory, the abnormal operating procedure for severe weather will be revised to require increased inventory be maintained in the DFOSTs in the event of indications of j
impending severe weather conditions.
In a letter dated May 2, 1995, the licensee stated that the above cited revision of emergency and abnormal operating procedures for loss of power transients has been implemented; an administrative control procedure is in place to reserve a minimum fuel oil inventory in the FOST for transfer to the DFOSTs to extend the fuel oil supply for EDG operation to 7 days following a LOCA; and the maintenance program for the F0ST has been upgraded to be similar to the maintenance program currently in effect for the DF0STs.
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, l Therefore, the staff concludes that the licensee will have adequate and reliable fuel oil inventory for 7 days of continuous EDG operation following a LOCA at the SGS and finds the above proposed TSs changes acceptable.
4.0 STATE CONSULTATION
In accordance with the Commission's regulations, the New Jersey State official was notified of the proposed issuance of the amendments. The State official had no coments.
5.0 ENVIRONMENTAL CONSIDERATION
The amendments change a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20. 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 Comission has previously issued a proposed finding that the amendments involve no significant hazards consideration, and there has been no public coment on such finding (59 FR 42346). Accordingly, the amendments meet the 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 i
the amendments.
5.0 CONCLUSION
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The Comission 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:
C. Bajwa Date:
June 20, 1995