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

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Additional Information Related to License Condition 2.C.(6) Seismic Evaluation
ML023600458
Person / Time
Site: Cooper Entergy icon.png
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)
v • d • e


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

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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

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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.

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

NLS2002093 ENCLOSURE 1 Leakage Paths From Outboard MSIVs

INBOARD MSkVS TO FEEDWATIR TO FEEDWATER PUMP TURBINES REACTOR FEED4 RX uUDG

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/~~s-s.&v RHR 2041 1

L8S-75?AV CLOSED BY OPERATOR ACTION ON HICH ON RX 51 HIGH RAD IN STEAM TUnNNEL AND ALSO CLOSES ON LOOP

1. SOLID LINE DEPICTS THE LEAKG PATH AND PRESS RE BOUNOARY FROM THE OUTBOARD MSrfv.
2. DASHED UNE IS NOT A LEAKAGE*

ATH (NOT IN SCOPE).

3 OPEN BELOW 50% STEAM FLDW. Y BE CLOSED ABOVE 501 STEAM F1*. BOTH POSITIONS ARE CONSIDERED

4. THIS NOTE NOT USED.

S. NOT ALL LINES SHOWN (e.g. 1-1I iET AND SENSING IUNES).

5. FLOW DRAWING NUMBERS SHOW ON UNE e.g:
7. POTENTIAL L.*,AGE PAMTH WM 4

WTH A "P' DESIGNATION.

EXAMPIL:

P1.

SBOUNARY CONImONS SHOWN WT A LETTER IN A TRIANGLE EAMPLE

.F,

9.

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

10. ADO NEW 2 VALVE TO CLOSE P*ST-LOCA. (1)

I1. ADO NEW 5" VALVE TO CLOSE P*sr-LoCA. (I)

S -52 ZO2 3K1

  • 3K.2 Ps TO CYLINDER HEATING (NOT 12 7110S 4.'

-GLAND SEAL HIGH PRESURE j1 I

8(145-29)1 2= SK als G-'LAND SEAL LOWPRS r-.P-r-Lp, CONDENSER2I

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lI9 -- swT CLLMW4C--\\

lop Fr

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& 18 RLV OM TR(4 PLO S

(4)u7 (FROM TRIP PILOT VALVES) 2m sPL F

W X241-210

.4TO FWHI 5A At 58 CLOSES ON e TRIP LE5 58234.1 &

34.1 1353 OPES ON TURBINE TRP 2002 3". & 2005 SKI1

- TO CONDENSE

& SIAE 200234N.1 A 2 3S1.3 IOTE 21

ý 2W24 St 2

TO 'I SAUX. STEAM SYSTEMSE&

CON4DENSER A

20. CLOSE ROOT VALVES POST LOCA (3)

MS-15a TO PI-18SA MS-159 TO PI-1838 MS--1O TO PI-t8ax

21. Cl ROOT VALVE POST LOCA MS-18o TO PI-154 (I)
12. ADO 2 NEW 1 1/2" VALVES TO CLOSE POST-LOCA. (2)
13. EQUALIZING VALVES NORMALLY CLOSED.
14. CLOSE POST-LOCA. (1)

I5. INSTALL AND MANIPU.ATE SHAFT ADJUSTMET SYSTEM.

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

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17. ADO NEW 4" VALVE TO CLOSE POST-LOCk (1) lS. VALVES SHOWN IN POST LOC POSITION.
19. CLOSE POST-LOC. (2)

FOR CONSTRUCTION I

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LEAKAGE PATHS FROM OUTBOARD MSIV's COOPER NUCLEAR STATION I CADD DRAWING

~0I D NT MV!20WAMhiY

ýD I'm6, M.Y 10/15/02 N

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"-CNS-MS-43 I I-7 4

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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.

1M COMMITTED DATE COMMITMENTOR OUTAGE None N/A

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

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