ML20210E621

Submits Rev to non-limiting Licensing Basis LOCA Peak Clad Temps (Pcts) for Limerick Generating Station (Lgs),Units 1 & 2 & Pbaps,Units 2 & 3

ML20210E621
Person / Time
Site:	Peach Bottom, Limerick
Issue date:	07/22/1999
From:	Hutton J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9907280279
Download: ML20210E621 (5)

Text

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Ann.

, sgy- 10 CFR 50.46 (a)(3)(i) and (ii)

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PECO NUCLEAR recoe, - c -

965 Chesterbrook Boulevard A Unit of PECO Energy Wayne, PA 19087-5691 July 22,1999 Docket Nos. 50-352 50-353 l

50-277 50-278 I

i License Nos. NPF-39 NPF-85 DPR-44 1 DPR-56 l U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 l

Subject:

Limerick Generating Station, Units 1 and 2 Peach Bottom Atomic Power Station, Units 2 and 3

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10 CFR 50.46 Reporting Requirements l

Dear Sir / Madam:

In accordance with 10 CFR 50.46 (a)(3)(i) and (ii), the following is a revision to the non-limiting licensing basis Loss-of-Coolant Accident (LOCA) peak clad temperatures (PCTs) for Limerick Generating Station (LGS), Units 1 and 2 and Peach Bottom Atomic Power Station (PBAPS), Units 2 and 3. Table 1 (attached) provides the revised licensing basis l PCT values and the prior PCT error accumulation changes for LGS, Units 1 and 2, respectively. Tables 2 and 3 (attached) provide the revised licensing basis PCT values and the prior PCT error accumulation changes for PBAPS, Units 2 and 3, respectively. Based on the accumulated changes which result in a temperature difference of greater than 50 F from the calculated baseline temperature, this report is being submitted within 30 days.

i in a 10 CFR 50.46 Notification Letter from GE Nuclear Energy dated June 24,1999

(" Counter Current Flow limiting (CCFL) Coeficients in SACER Analyses for GE8, GE9, GE10, and Siemens Fuel"), PECO Energy Company was informed that GE technical design procedures which govem the SAFER analysis, did not correctly model CCFL at the upper spacer for GE8, GE9, GE10, and Siemens 8x8 and 9x9 fuel types. This error is not applicable to the SAFER analyses for GE11 and later fuel types. This error impacts the ,

non-limiting fuel type PCTs at LGS, Units 1 and 2, and PBAPS, Units 2 and 3. This change ooes not impact the limiting fuel type PCTs.

The attached Tables provide, by fuel type, the baseline (calculated) PCTs, the prior PCT error accumulations, and the resultant estimated licensing basis PCTs for the limiting and 4 non-limiting fuel types. The estimated licensing basis peak clad temperatures for the most limiting fuel types at LGS, Units 1 and 2 remain 1645 F (GE 11/13), respectively. This

' b 7 79 990722 K 05000277 P- PDR

July 22,1999

' Page 2 represents more than 500 F margin to the 2200* F limit specified in 10 CFR 50.46. The estimated licensing basis peak clad temperatures for the rnost limiting fuel types at PBAPS, Units 2 and 3 remain 1795* F (P8x8R) and 1755' F (P8x8R), respectively. This represents more than 400* F margin to the 2200* F limit specified in 10 CFR 50.46. Additionally, the upper bound peak clad temperature for fuel at both stations remains below the 1600* F limit specified in the USNRC acceptance of the SAFER /GESTR methodology. Therefore, no additional action is required.

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

Very truly yours, D/

wW

. A. Hutton Director- Licensing Attachments cc: H. J. Miller, Administrator, Region I, USNRC A. L. Burritt, USNRC Senior Resident inspector, LGS A. C. McMurtray, USNRC Senior Resident inspector, PBAPS l

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July 22,1999 Docket Nos. 50-352/353 TABLE 1 CURRENT BASELINE PCT ( F) VALUES AND ERROR ACCUMULATION LIMERICK 1 AND 2 1

P8x8R GE8 GE9 GE 11/13 {

BASELINE PCT 1625 1515 1515 1605 Pdor PCT Enor 10 10 40 40 Accumulation

• 6/24/99 50.46 Letter from GE 0 10 10 0 l CCFL Coeflicients TOTAL 10 20 50 40 l NEW ESTIMATED LICENSING 1635 1535 1565 1645 BASIS PCT VALUES

+ Discussed in letter from G.D. Edwards (PECO Energy Company) to USNRC, dated November 4,1998, for LGS, Units 1 and 2.

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i July 22,1999 Docket No. 50-277 i

TABLE 2 CURRENT BASELINE PCT ( F) VALUES AND ERROR ACCUMULATION PEACII BOTTOM 2 - WITil RECIRCULATING PUMP TRIP P8x8R GE8 GE9 GE 11/13 BASELINE PCT 1735 1624 1624 1645 Prior PCT Error 60 60 90 95 Accumulation

• 6/24/99 50.46 Letter from GE 0 25 25 0 CCFL Coefficients

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TOTAL 60 85 115 95 NEW ESTIMATED LICENSING 1795 1709 1739 1740

' BASIS PCT VALUES

• Discussed in letter from G.D. Edwards (PECO Energy Company) to USNRC, dated November 4,1998, for PBAPS, UrJts 2 and 3. I l

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July 22,1999 Docket No. 50-278 I

l TABLE 3 CURRENT BASELINE PCT ( F) VALUES AND ERROR ACCUMULATION PEACII BOTTOM 3 - NO RECIRCULATING PUMP TRIP P8x8R GE8 GE9 GE 11/13 BASELINE PCT 1690 1575 1575 1645 Pdor PCT Enor 65 65 95 95 Accumulation

• 6/24/99 50.46 Letter from GE O 25 25 0 CCFL Coefficients

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TOTAL 65 90 120 95 NEW ESTIMATED LICENSING 1755 1665 1695 1740 BASIS PCT VALUES

• Discussed in letter from G.D. Edwards (PECO Energy Company) to USNRC, j dated November 4,1998, for PBAPS, Units 2 and 3.