NL-12-2567, CFR 50.46 ECCS Evaluation Model Annual Report for 2011

CFR 50.46 ECCS Evaluation Model Annual Report for 2011

ML12353A600
Person / Time
Site:	Hatch
Issue date:	12/18/2012
From:	Ajluni M Southern Co, Southern Nuclear Operating Co
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
NL-12-2567
Download: ML12353A600 (6)

Text

Mark J. Ajluni, P.E. Southern Nuclear Nuclear Licensing Director Operating Company, Inc.

40 Invern ess Center Parkway Post Office Box 1295 Birmingham, Alabama 3520 1 Tel 205.992.7673 Fax 205.992.7885 December 18, 2012 SOUTHERN . \

COMPANY Docket Nos. : 50-321 NL-12-2567 50-366 U. S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, D. C. 20555-0001 Edwin I. Hatch Nuclear Plant 10 CFR 50,46 ECCS Evaluation Model Annual Report for 2011 Ladies and Gentlemen:

Southern Nuclear Operating Company (SNC) is the licensed operator for the Edwin I. Hatch Nuclear Plant (Hatch). The requirements of 10 CFR 50,46(a)(3)(ii) include an annual report by licensees of changes to or errors in acceptable emergency core cooling system (ECCS) models that affect the temperature calculation and the estimated effect of changes or errors on the limiting ECCS analysis. Accordingly, the report required by 10 CFR 50,46(a)(3)(ii) for Hatch is provided in Enclosure 1, The resulting peak cladding temperature (PCT) for Hatch continues to meet the criterion of 10 CFR 50.46(b)(1) (i.e., S 2200°F).

This letter contains no NRC commitments. If you have any questions, please contact Ken McElroy at (205) 992-7369.

Respectfully submitted,

~ tCif--:

M. J. Ajluni Nuclear Licensing Director MJAlRMJllac

Enclosure:

1. Edwin I. Hatch Nuclear Plant 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2011

U. S. Nuclear Regulatory Commission NL-12-2567 Page 2 cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bost, Executive Vice President & Chief Nuclear Officer Mr. D. R. Madison, Vice President - Hatch Mr. B. L. Ivey, Vice President - Regulatory Affairs Mr. B. J. Adams, Vice President - Fleet Operations RTYPE: CHA02.004 U. S. Nuclear Regulatory Commission Mr. V. M. McCree, Regional Administrator Mr. R. E. Martin, NRR Senior Project Manager - Hatch Mr. E. D. Morris, Senior Resident Inspector - Hatch

Edwin I. Hatch Nuclear Plant 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2011 Enclosure 1

Enclosure to NL-12-2567 Edwin I. Hatch Nuclear Plant 10 ECCS Model Annual  !-(Qr'f'lrT for 2011 Edwin I. Hatch Nuclear Plant Unit 1 SAFERIGESTR-LOCA Analysis Model Table 1-1a - Summary of Changes/Errors (2011)

Estimated Description Effect (6 PCT)

None affecting N/A Table b Cumulative Changes/Errors GE14 Description

.. Changes/Errors Reported (Reference 1) 0*

.. Current Year - 2011 I-Iotoronl"'" 2) 0*

Cumulative Total o

.,. On August 12, 2011, a Significant Change/Error I-Io'for,:.nr*", 1). This baseline PCT for ron,Art,nl"l were

",ri/"l,1'II,\n" changes/errors in 2011 from E-1

Enclosure to NL-12-2567 Edwin I. Hatch Nuclear Plant 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2011 Edwin I. Hatch Nuclear Plant Unit 2 SAFERIGESTR-LOCA Analysis Model Table 1-2a - Summary of Changes/Errors (2011)

Estimated Description Effect

(~ PCT)

None affecting pcr N/A Table 1-2b - Cumulative Impact of Changes/Errors GE14 Description

~IPCTI (OF)

• Changes/Errors Previously Reported (Reference 1) 0*

• Current Year - 2011 (Reference 2) 0*

0 Cumulative Total

• On August 12, 2011, a Significant Change/Error Report for Hatch was submitted (Reference 1). This "reset" the baseline PCT for reporting purposes. There were no additional changes/errors in 2011 from those reported in Reference 1.

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Enclosure to NL-12-2567 Edwin I. Hatch Nuclear Plant 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2011

References:

1. Letter from Mark J. Ajluni to USNRC (NL-11-1652), "Edwin I. Hatch Nuclear Plant 10 CFR 50.46 ECCS Evaluation Model Significant Change/Error Report," dated August 12, 2011.

2. Letter from J. D. Chavers to L. P. Hill (CAH-12-044), "2011 ECCS Error Notifications for Plant Hatch," dated December 11, 2012.

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