NLS2002093, Additional Information Related to License Condition 2.C.(6) Seismic Evaluation

Additional Information Related to License Condition 2.C.(6) Seismic Evaluation

ML023600458
Person / Time
Site:	Cooper
Issue date:	12/19/2002
From:	Coyle M Nebraska Public Power District (NPPD)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NLS2002093
Download: ML023600458 (6)

Text

H Nebraska Public Power District Nebraska's Energy Leader NLS2002093 December 19, 2002 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001

Subject:

Additional Information Related to License Condition 2.C.(6) Seismic Evaluation Cooper Nuclear Station NRC Docket No. 50-298, DPR-46

Reference:

1. Letter to U. S. Nuclear Regulatory Commission from D. Wilson (Nebraska Public Power District), dated February 26, 2002, "License Condition 2.C.(6) Seismic Evaluation" (NLS2002014).

2. Letter to U.S. Nuclear Regulatory Commission from D. Wilson (Nebraska Public Power District), dated November 25, 2002, "Design Basis Accident Radiological Assessment Calculation Methodology- Additional Information" (NLS2002135).

The purpose of this letter is two-fold. First, to provide the Nuclear Regulatory Commission (NRC) staff with the final design decisions for configuring the Main Steam Isolation Valve (MSIV) leakage pathway, as committed to in Reference 1. Second, to request a target date for formal NRC acceptance of the License Condition 2.C.(6) seismic evaluation.

The final configuration of the MSIV leakage pathway is as shown on Enclosure 1. This drawing replaces the one provided in Enclosure 1 to Reference 1, and depicts the pathway piping and boundary valves (including those yet to be installed). Reference 1 described two options being pursued to direct the MSIV leakage to the Main Turbine Condenser. The principal underlying purpose for both of those options was to provide assurance that leakage outside of the MSIV leakage pathway boundary via the Turbine Stop Valve shaft leakage area would be minimized, as discussed in Appendix C to NEDC-31858P Revision 2, "BWROG Report for Increasing MSIV Leakage Rate Limits and Elimination of Leakage Control Systems." After due consideration, the Nebraska Public Power District (NPPD) has decided on a better course of action. The cross sectional leakage area is being reduced by mechanically adjusting the Stop Valve actuator/control shaft positions through use of a special pre-staged tool, applied as a post-Loss of Coolant Accident manual action.

With this submittal, NPPD believes it has satisfied all of the NRC's information needs associated with their review of the License Condition 2.C.(6) seismic evaluation methodology.

Notwithstanding NPPD's request in Reference 2 to extend the full implementation of the At-- 2 Cooper Nuclear Station P.O. Box 98 /Brownwvlle, NE 68321-0098 Telephone: (402) 825-3811 / Fax: (402) 825-5211 http //www nppd com &0

NLS2002093 Page 2 of 3 methodology to no later than startup from Refueling Outage 22, NRC approval of the seismic methodology remains a key milestone in going forward with these efforts. Accordingly, NPPD requests the NRC provide their formal approval by February 26, 2003, which marks the one year point from the submittal of Reference 1.

Should you have any questions regarding this matter, please contact Paul V. Fleming at (402) 825-2774.

Sincerely, A

Michael T. Coyle Site Vice President

/wrv Enclosure cc: Regional Administrator w/enclosure Region IV USNRC Senior Project Manager w/enclosure USNRC - NRR Project Directorate IV-1 Senior Resident Inspector w/enclosure USNRC NPG Distribution w/o enclosure Records w/enclosure

NLS2002093 Page 3 of 3 STATE OF NEBRASKA ))

NEMAHA COUNTY )

Michael T. Coyle, being first duly sworn, deposes and says that he is an authorized representative of the Nebraska Public Power District, a public corporation and political subdivision of the State of Nebraska; that he is duly authorized to submit this correspondence on behalf of the Nebraska Public Power District; and that the statements contained herein are true to the best of his knowledge and belief.

Michael T. Coyle I Subscribed in my presence and sworn to before me this Iq day of

• 2002.

I* GENERAL NOTARY-State of Nebraska I B. J. SHUBERT My Comm. Exp. Sept 15, 2003 ATARYPBI

NLS2002093 ENCLOSURE 1 Leakage Paths From Outboard MSIVs

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&SAUX.STEAM ý 2W24 St 2 SYSTEMSE&

CON4DENSER

1. SOLIDLINEDEPICTS THE LEAKG PATHAND PRESS RE 20. CLOSEROOTVALVES POST LOCA(3)

BOUNOARY FROMTHE OUTBOARD MSrfv. MS-15a TO PI-18SA MS-159 TO PI-1838

2. DASHEDUNE IS NOTA LEAKAGE* ATH (NOT IN SCOPE). MS--1O TO PI-t8ax 3 OPEN BELOW50% STEAMFLDW. Y BE CLOSEDABOVE 21. Cl ROOT VALVEPOST LOCA 501 STEAMF1*. BOTH POSITIONS ARE CONSIDERED MS-18o TO PI-154 (I)

4. THIS NOTENOT USED.

12. ADO2 NEW 1 1/2" VALVESTO CLOSEPOST-LOCA. (2)

S. NOTALL LINESSHOWN(e.g. 1-1I IUNES).

iET AND SENSING

13. EQUALIZINGVALVESNORMALLY CLOSED.

FOR CONSTRUCTION

5. FLOWDRAWINGNUMBERSSHOW ON UNE e.g: 14. CLOSEPOST-LOCA.(1) ICADD DRAWING

7. POTENTIAL L.*,AGE PAMTH WM 4

WTH A "P' I5. INSTALLAND MANIPU.ATE SHAFTADJUSTMET SYSTEM. ~0I D NTMV!20WAMhiY DESIGNATION. EXAMPIL: P1.

1. ADO NEW I 1/4" VALVE POw1-LOCA.( )I TO CLOSE

- 1 II 1 II II II II ýD I'm6, I 9.

SBOUNARY CONImONS SHOWNWT IN A TRIANGLEEAMPLE .F ,

NORMALLY A LETTER CLOSED.OPEN POST-0A. (3)

17. ADONEW4" VALVETO CLOSEPOST-LOCk (1)

I LEAKAGE PATHS FROM 1 , a ,

M.Y 10/15/02 N

10. ADO NEW2 VALVETO CLOSEP*ST-LOCA. (1) lS. VALVES SHOWNIN POST LOC POSITION. OUTBOARD MSIV's S 1;/,2*/02

19. CLOSE POST-LOC. (2)

COOPER NUCLEAR STATION I1. ADONEW 5" VALVETO CLOSEP*sr-LoCA. (I)

"-CNS-MS-43 I t,

ATTACHMENT 3 LIST OF NRC COMMITMENTS Correspondence No: NLS2002093 The following table identifies those actions committed to by the Nebraska Public Power District (NPPD) in this document. Any other actions discussed in the submittal represent intended or planned actions by NPPD. They are described to the NRC for the NRC's information and are not regulatory commitments. Please notify the NL&S Manager at Cooper Nuclear Station of any questions regarding this document or any associated regulatory commitments.

COMMITMENTOR 1M COMMITTED DATE OUTAGE None N/A

• 1-

• 1-

• 1*

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I PROCEDURE NUMBER 0.42 1 REVISION NUMBER 11 1 PAGE 13 OF 16 1