ML20086A894
| ML20086A894 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 06/01/1995 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20086A889 | List: |
| References | |
| NUDOCS 9507050086 | |
| Download: ML20086A894 (3) | |
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UNITED STATES s
g NUCLEAR REGULATORY COMMISSION 2
WASHINGTON, D.C. 20066 4 001
.....,o SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NOS. 90 AND 54 TO FACILITY OPERATING LICENSE NOS. NPF-39 AND NPF-85 PHILADELPHIA ELECTRIC COMPANY LIMERICK GENERATING STATION. UNITS 1 AND 2 DOCKET N05. 50-352 AND 50-353
1.0 INTRODUCTION
By letter dated August 25, 1993, as supplemented by letters dated June 27, 1994, and May 5,1995, the Philadelphia Electric Company (PEco or the licensee) submitted a request for changes to the Limerick Generating Station, Units 1 and 2, Technical Specifications (TSs).
The requested change would modify TS Surveillance Requirement (SR) 4.7.1.3 to require that all spray pond spray network piping above the frost line be drained at an ambient temperature below 40*F, and within one hour after being used only when the ambient air temperature is below 40*F.
2.0 EVALUATION The spray pond serves both units at Limerick Generating Station (LGS) and is designed to supply the safety-related cooling water for the Emergency Service Water (ESW) and Residual Heat Removal Service Water (RHRSW) systems during accident conditions. The spray pond contains four spray tree networks with all piping above. the water level on concrete pillars. Only one spray tree i
network is required for the safe shutdown of one unit and my two networks provide sufficient cooling to safely shut down both units.
Currently, Technical Specification (TS) Surveillance Requirement (SR) 4.7.1.3c requires that all spray pond piping above the frost line be drained within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after use regardless of the ambient air temperature. The proposed TS change would modify this TS SR to require that this piping be drained at an J
ambient temperature below 40*F, and within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after use whenever the ambient air temperature is below 40'F for freeze protection. As an added measure, the licensee has committed to revise the plant procedures that govern the draining of the spray pond piping networks to require draining within I hour after use, regardless of air temperature, during the time period between November 1 and March 31. This time period was selected based on National Weather Bureau data. These procedures will assure that discrepancies between air and ground temperatures will not be a factor in assuring that ice does not form in the spray pond piping located above the frost line. The licensee also plans to record the ambient air temperature each time the spray networks are 9507050086 950601 PDR ADDCK 05000352 P
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. secured to allow further evaluation of the temperatures during the time period of November 1 to March 31, regardless of the ambient air temperature.
In the event that the spray pond piping is not drained per the licensee's implementing procedures, compliance with the TS requirements will be evaluated by PEco. The staff recognizes that the licensee's implementing procedures are subject to change via the 10 CFR 50.59 process.
The proposed change to the TS SR does not require any modifications to the plant or equipment, and does not impact any design or functional requirements of the spray pond, ESW, or RHRSW systems. The ESW and RHRSW systems will continue to function as designed to mitigate the consequences of an accident by supplying cooling water to selected plant equipment.
The spray pond spray networks for the ESW and RHRSW systems will continue to operate as designed.
Plant procedures will still continue to require that the spray networks be drained within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after use in order to minimize corrosion.
The proposed change is consistent with the NRC staff position provided in NUREG-0991, " Safety Evaluation Report Related to the Operation of Limerick Generating Station, Units 1 and 2," dated August 1983.
In'the evaluation, the NRC staff required that a limiting condition for operation be incorporated into the TSs that the spray pond piping be drained at an ambient air temperature of 40*F, and, within I hour after the operation of the spray networks with the air temperature below 40*F, all piping above the frost line is to be drained.
Therefore, the staff concludes that the proposed change is acceptable.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Pennsylvania State official was notified of the proposed issuance of the amendments. The State official had no comments.
4.0 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 and changes 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 j
occupational radiation exposure. The Commission has previously issued a proposed finding that the amendments involve no significant hazards consideration, and there has been no public comment on such finding (58 FR 50972). 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.
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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 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:
J. Zimmerman F. Rinaldi Date: June 1, 1995 M
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