ML20238F825

Forwards NPSH Analyses to Reflect New Strainer Design for Lgs,Unit 2 RHR & CS Pumps in Response to RAI Re ECCS Suction Strainer Mod

ML20238F825
Person / Time
Site:	Limerick
Issue date:	08/28/1998
From:	Geoffrey Edwards PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20238F827	List: ML20238F825 ML20238F835 ML20238F845
References
NUDOCS 9809040356
Download: ML20238F825 (3)

Text

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ctition Support Department e A PECO NUCLEAR acoaign";1e A Unit of PECO Energy *#""

August 28,1998 Docket No. 50-353 License No. NFP-85 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Subject:

Limerick Generating Station, Unit 2 Response to Request for Additional Information Emergency Core Cooling System Suction Strainer Modification

Dear Sir / Madam:

By letter dated October 6,1997, PECO Energy submitted license amendment requests for Limerick Generating Station (LGS), Units 1 and 2, to facilitate implementation of a plant modification to install new suction strainers on certain Emergency Core Cooling System (ECCS) pump suction lines. Implementation of this modification is in response to the requested actions identified in Bulletin 96-03," Potential Plugging of Emergency Core Cooling Suction Strainers by Debris in Boiling Water Reactors."

By letter dated December 30,1997, the NRC issued a request for additional information regarding the license amendment requests. The NRC identified two (2) issues, one of which requested copies of the Net Positive Suction Head (NPSH) analysis for the Residual Heat Removal (RHR) and Core Spray (CS) pumps reflecting the new ECCS strainer design assumptions. PECO Energy responded to the NRC's request by letter dated February 2,1998.

Copies of the applicable NPSH analyses for the LGS, Units 1 and 2, RHR and CS pumps were included in our response. The RHR and CS pump NPSH analyses are identical for LGS, Units 1 /

and 2. However, at the time of submittal the analyses only pertained to Unit 1, since this was the [/

first of the LGS units to undergo strainer modification work. k Subsequently, by letter dated May 14,1998, the NRC issued Amendment No.128 to Facility Operating License No. NPF 39 for LGS, Unit 1. The Unit 2 license amendment request is still pending NRC approval. In the May 14,1998 letter, the NRC indicated that its evaluation of the license amendment request for LGS, Unit 2, was being deferred pending our response to the --

request for additional information regarding the NPSH analyses for Unit 2.

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9809040356 980828 '

PDR ADOCK 05000353 P PDR

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i August 28,1998 Page 2 Accordingly, the attachments to this letter contain the NPSH analyses to reflect the new strainer design, for the LGS, Unit 2, RHR and CS pumps. The analyses are identical to those previously submitted in our letter dated February 2,1998. This information is being resubmitted for your convenience.

If you have any questions or require additional information, please do not hesitate to contact us.

Very truly yours,

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G. D. Edwards Director- Licensing Attachments cc: H. J. Miller, Administrator, Region 1 USNRC (w/ attachments)

A. L. Burritt, USNRC Senior Resident inspector, LGS (w/ attachments)

R. R. Janati, Director, PA Bureau of Radiological Protection (w/ attachments) i 1

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- ATTACHMENT 1 >

Limerick Generating Station, Unit 2 .

NPSH Analysis Residual Heat Removal System

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