ML20070F515

Application for Amends to Licenses NPF-39 & NPF-85,proposing Changes to TS Bases,Section 3/4.5.1,to Accurately Reflect Safety Analysis Assumptions for Automatic Depressurization Sys

ML20070F515
Person / Time
Site:	Limerick
Issue date:	07/13/1994
From:	Hunger G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20070F518	List: ML20070F515 ML20070F524
References
NUDOCS 9407190082
Download: ML20070F515 (3)

Text

Station Supp;rt DIpertmsnt

L IECO ENERGY = = ::; L 965 Chesterbrook Boulevard Wayrie. PA 190874691 July 13,1994 Docket Nos. 50-352 50-353 License Nos. NPF-39 NPF-85 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

Umerick Generating Station, Units 1 and 2 Proposed Change to the Technical Specifications Bases Regarding the Safety Analysis Assumptions for the Automatic Depressurization System Gentlemen:

PECO Energy Company proposes a change to the Limerick Generating Station (LGS),

Units 1 and 2 Technical Specifications (TS) Bases, Section 3/4.5.1, " EMERGENCY CORE COOLING SYSTEM - OPERATING," to accurately reflect the safety analysis assumptions for the Automatic Depressurization System (ADS). The Loss of Coolant Accident (LOCA) analysis assumes five operable ADS valves, instead of four valves, as the subject TS Bases currently states.

The proposed TS Bases change will correct the TS Bases to be consistent with the LOCA safety analysis performed by General Electric (GE), for LGS Units 1 and 2. This analysis has been presented in the GE topical report NEDC-32170P, Revision 1, "Umerick Generating Station Units 1 and 2 SAFER /GESTR-LOCA Loss-of-Coolant Accident Analysis," dated June 1993, which has been accepted by the NRC for use at LGS Units 1 and 2, as documented in the NRC letter to PECO dated February 10, 1994.

LGS Units 1 and 2 currently operate with five ADS valves required to be operable.

Accident analyses assume five ADS valves operable. Sensitivity to a single ADS valve  !

failure is addressed in the GE topical report referenced above. This is not considered I a normal operational mode as may be construed from the present wording of the subject TS Bases which states that the " safety analysis only takes credit for four l valves". While it is still appropriate to permit one ADS valve to be out-of-service for up l

to fourteen days, it is not appropriate that the out-of-service time may be extended )

indefinitely, since five ADS valves are required to be operable according to the safety i' analysis. y p ,

-v 94o7190082 94o713 PDR ADoCK 05000352 pd0 P PDR g

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J Therefore, we propose that TS Bases, Section 3/4.5.1 be corrected to remove any ambiguity in wording and accurately represent the ADS safety analysis assumptions.

Attachment 1 to this letter contains the proposed change to the LGS Units 1 and 2 TS Bases, Section 3/4.5.1.

If you have any questions, please do not hesitate to contact us.

Very truly yours, b.

G. A.a. 4pJr.,. ), .

Hunger, Director - Licensing Attachment cc: T. T. Martin, Administrator, Region I, USNRC - w/ attachment N. S. Perry, USNRC Senior Resident inspector, LGS - w/ attachment R. R. Janati, Director, PA Bureau of Radiological Protection - w/ attachment l

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ATTACHMENT 1 i LIMERICK GENERATING STATION  !

UNITS 1 AND 2 l

DOCKET NOS. 50-352 50-353 7 LICENSE NOS. NPF-39 NPF-85 ,

PROPOSED TECHNICAL SPECIFICATIONS BASES CHANGE .

i LIST OF AFFECTED PAGES  ;

i UNIT 1 UNIT 2 i B 3/4 5-2 B3/45-2 i

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