ML17165A039
| ML17165A039 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 07/07/1999 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML17165A038 | List: |
| References | |
| NUDOCS 9907190216 | |
| Download: ML17165A039 (5) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON> D.C. 20555-0001 SAFETY EVALUATIONBY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENTNO. 183 TO FACILITYOPERATING LICENSE NO. NPF-14 AMENDMENTNO. 157 TO FACILITYOPERATING LICENSE NO. NPF-22 PP8rL INC.
ALLEGHENYELECTRIC COOPERATIVE INC.
SUSQUEHANNA STEAM ELECTRIC STATION UNITS 1 AND 2 DOCKET NOS. 50-387 AND 388
1.0 INTRODUCTION
By letter dated November 23, 1998, PP&L, Inc. (the licensee) submitted a request for changes to the Susquehanna Steam Electric Station, Units 1 and 2 (SSES), Technical Specifications (TSs). The requested changes would modify the SSES TS limiting condition for operation (LCO), 3.8.3, and surveillance requirement (SR), 3.8.3.1, to increase the minimum fuel oil storage tank (FOST) volume ranges. Currently, the specified minimum usable fuel oil volume range is (44,900 gallons and )38,600 gallons for the diesel generators (DGs). These values were adopted with the implementation of the Improved Technical Specifications (ITS) for SSES that were based upon NUREG-1433, "Standard Technical Specifications General Electric Plants BWR/4." Subsequent to the implementation of the ITS for SSES, the licensee identified that the FOST capacity requirements, which were based on the post design basis accident (DBA) DG load profile, were less conservative than the capacity required for previous plant-specific TSs, which were based upon the continuous DG ratings. The licensee stated in its November 23, 1998, submittal that administrative controls were implemented to require the larger volumes until the proposed TSs are issued.
2.0 EVALUATION The safety function of the EDG FOST is to supply the emergency diesel generators (EDGs) with enough fuel to ensure the availability of necessary power to engineered safety features systems so that fuel, reactor coolant, and containment system design limits are not exceeded in the event of a loss of offsite power. The current FOST volume as specified in the Susquehanna TS is based on the EDG DBA load profile.
The proposed FOST volumes are based on EDG continuous rated load ratings that are calculated in accordance with the American National Standards Institute (ANSI) Standard N195-1976.
Specifically, the TSs for A.C. electrical power systems include a requirement that the FOST for the EDGs shall contain a certain quantity of usable fuel oil during operation (TS 3.8.3). There are five tanks, one for each of the five DGs. The basis for this specification is that each of the five tanks willcontain sufficient usable fuel oil to operate the associated DG for 7 9907%902th 9'F0707 PDR ADOCK 05000387 P
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days following a loss-of-coolant accident at maximum continuous load conditions.
Currently, the specified minimum usable fuel oil volume range is <44,900 gallons and >38,600 gallons for the DGs. These values were adopted with the implementation of the ITS.
Subsequent to the implementation of the ITS for SSES, the licensee identified that the FOST capacity requirements (based on the post DBA EDG load profile) were less conservative than the previous plant-specific TSs.
The proposed capacity requirements for the FOST are based upon the EDG continuous load ratings and are calculated in accordance with ANSI N195-1 976, as described in the SSES Final Safety Analysis Report, Section 9.5.4. The proposed FOST level range in LCO 3.8.3, Condition A, is <47,570 gallons and >41,018 gallons for DGs A, B, C, and D. The range level for DG E is increased to <60,480 g'allons and >52,340 gallons. The upper limits are calculated from the 7-day fuel oil consumption at the continuous DG ratings plus the unusable volume in the FOST.
The lower limits for DG equal 6/7 of the 7-day fuel oil consumption at the continuous DG ratings plus the unusable volume in each FOST.
The required minimum volume is the minimum amount of fuel oil needed to operate a DG for 7 days in response to any DBA. The volume needed for the FOST was increased due to the application of the methodology in ANSI Standard N195-1976.
As stated in Section C of Regulatory Guide 1.137, "Fuel-Oil Systems for Standby Diesel Generators," a 7-day fuel oil supply and the methodology in the above ANSI Standard are an acceptable basis for determining the minimum volume of DG fuel oil~ The licensee stated that it used the continuous name plate rating method of the ANSI Standard and assumed a DG operates for 7 days at its rated continuous load to determine the minimum amount of fuel oil needed.
The proposed FOST range is consistent with the plant's design basis and calculated such that the volume requirements are adequate to support the EDG's post-accident design basis safety function. The proposed changes to the TSs place additional restrictions upon the amount of fuel which must be maintained in each FOST and, therefore, are conservative.
Based upon the above evaluation, the Nuclear Regulatory Commission (NRC) staff concludes that the licensee's proposed TS changes to LCO 3.8.3 and SR 3.8.3.1 are acceptable.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Pennsylvania State officialwas notified of the proposed issuance of the amendments.
The State official had no comments.
4.0 ENVIRONMENTALCONSIDERATION 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 and change the 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
JI public comment on such finding (64 FR 41 60). Accordingly, the amendments meet the eligibilitycriteria 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 Commission has concluded, based on the considerations discussed above, that: (1) there is reasonable assurance that the health and safety of the public willnot be endangered by operation in the proposed manner, (2) such activities willbe 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:
B. Mozafari Date:
duly 7, 1999