ML20199G514
| ML20199G514 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 01/15/1999 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20199G498 | List: |
| References | |
| NUDOCS 9901220317 | |
| Download: ML20199G514 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION
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WASHINGTON, D.C. 20555-0001
%, *...+p SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.175 TO FACILITY OPERATING LICENSE NPF-35 AND AMENDMENT NO. 167 TO FACILITY OPERATING LICENSE NPF-52 DUKE ENERGY CORPORATION. ET AL.
CATAWBA NUCLEAR STATION. UNITS 1 AND 2 DOCKET NOS. 50-413 AND 50-414
1.0 INTRODUCTION
By letter dated December 7,1998, Duke Energy Corporation, et al. (DEC, the licensee),
submitted a request for changes to the Catawba Nuclear Station, Units 1 and 2, Technical Specifications (TS). The requested changes would revise TS 3.8.3, " Diesel Fuel Oil, Lube Oil, and Starting Air," correcting the discrepancies between the current design and this section.
Section 3.8.3," Diesel Fuel Oil, Lube Oil, and Starting Air," of the joint Catawba Units 1 and 2 TS delineates operational and surveillance requirements (SRs) for the subject components. On December 7,1998, Duke Energy Corporation (DEC, the licensee) requested that certain parts of this section and the associated Bases section be revised. DEC has determined that these parts, as they currently stand, are in error and not in agreement with the existing design. The staff's review of DEC's proposed corrections is set forth below.
2.0 DISCUSSION AND EVALUATION 2.1 Technical Specifications Section 3.8.3 CONDITION 3.8.3.B currently states "One or more DGs (diesel generators) with lube oil inventory <600 gal and >575 gal." The licensee proposed to correct this to "One or more DGs with lube oil inventory <400 gal and >375 gal." SR 3.8.3.2 currently specifies that lubricating oil inventory be verified 2600 gal per 31 days. The licensee proposed to correct the inventory requirement to be a400 gal per 31 days.
The Diesel Generator Lube Oil System provides lubrication to permit proper operation of the diesel generators under all loading conditions. The system circulates the lube oil to the diesel engine working surfaces and removes excess heat generated by friction during engine operation. Each engine oil sump contains an inventory capable of supporting a minimum of 7 days of operation. This inventory is sufficient to allow the operator to replenish lube oil from outside sources.
The licensee stated that a recent calculation determined that a total volume of 363 gallons of lubrlcating oil would be needed in the sump to account for an unusable volume (161.4 gallons occupied by an antivortexing baffle) and oil burn (201.6 gallons for 7 days) to meet the 7-day operation requirement. For conservatism, the licensee proposed a minimum inventory of 9901220317 990115 PDR ADOCK 05000413 P
. 400 gallons, and a range of 375 400 gallons in which actions have to be taken to restore lube oilinventory to within limits. The licensee stated that the normal levelin the sump tank is approximately 540 gallons when the diesel engine is in standby condition (not running). When the diesel engine is running, the sump tank inventory drops to approximately 450 gallons. The licensee, therefore, believes that the proposed new TS requirement of 400 gallons can be easily met whether or not the engine is running. Furthermore, the licensee plans to raise the existing low lube oil alarm setpoint from its present value of 385 gallons to 415 gallons, ensuring that operators can be prompted to actions before the 400-gallon limit is reached.
The licensee stated that the current limit of 600 gallons and action range of 575-600 gallons came from erroneous information in the Updcted Final Safety Analysis Report (UFSAR).
Section 9.5.7.2.1 of the UFSAR indicated that the lube oil sump tank has a 700-gallon capacity, and that the normal operating lube oil inventory is 600 gallons. The licensee will revise the UFSAR to be consistent with the actual design in accordance with the requirements of Title 10 of the Code of Federal Reaulations Section 50.71(e).
The staff reviewed the licensee's submitted information and agreed that errors were inadvertently introduced when TS Section 3.8.3 nas issued by Amendment Nos.173 and 165 (September 30,1998). The licensee's proposed changes would correct the errors and are, therefore, acceptable.
2.2 TS Bases Section B 3.8.3 The licensee proposed to delete the sentence in the fourth paragraph under BACKGROUND that reads: "The onsite storage in addition to the engine oil sump is sufficient to ensure 7 days of continuous operation." As previously stated in Section 2.1 of this Safety Evaluation, the engine oil sump inventory alone is sufficient to ensure 7 days of continuous operation. The deletion of this sentence clarifies this paragraph and is consistent with the current design and revised TS Section 3.8.3.
Under ACTIONS B.1, the licensee proposed to revise the minimum lube oil inventory from the current 600 gallons to 400 gallons to support 7 days of continuous operation. This change is consistent with the current design and TS Section 3.8.3.
Under ACTIONS C.1, the licensee proposed to make a correction to reference the appropriate portions of TS Section 3.8.3. The revised second sentence (strikeout shows previous wording) now reads: "Normally, trending of particulate levels allows sufficient time to correct high particulate levels prior to reaching the limit for reasons other than addressed by Conditions A through E...." This correction is consistent with TS Section 3.8.3.
Under SURVEILLANCE REQUIREMENTS for SR 3.8.3.2, the last sentence currently reads:
" implicit in this SR is the requirement to verify the capability to transfer the lube oil from its storage location to the DG, when the DG lube oil sump does not hold adequate inventory for 7 days of fullload operation without the level reaching the manufacturer recommended minimum level." The licensee proposed to replace this last sentence with one that reads: "In order to account for the tube oil sump tank inventory decrease that occurs when the DG is started, the 400 gal requirement shall be met with the surveillance conducted while the DG is running." The licensee also proposed to rewrite the next paragraph to read: "A 31-day Frequency is adequate to ensure that a sufficient lube oil supply is available since DG starts l
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I l and run time are closely monitored by the unit staff." These revisions are consistent with the current design and TS Section 3.8.3.
The TS Bases is a licensee-controlled document, and is not part of the TS (10 CFR 50.36(a)).
However, the staff reviewed the licensee's proposed changes as supplementalinformation for the changes in TS Section 3.8.3. The staff finds the proposed changes to the Bases acceptable.
3.0 STATE CONSULTATION
in accordance with the Commission's regulations, the South Carolina State official, Mr. Virgn Autrey, was notified of the proposed issuance of the amendments. The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
The amendments change requirements with respect to the use of a facility component located within the restricted area and change surveillance requirements. The NRC staff has determined that the amendments involve no significant increase in the amounts, 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 staff has previously issued a proposed finding that the amendments involve no significant hazards consideration, and there has been no public comment on such finding (63 FR 69328 dated December 16, 1998). 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 the amendments.
5.0 CONCLUSION
The staff 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 Contributors: William T. LeFave Peter S. Tam Date:
January 15, 1999