ML11214A237

RAI for the Review of the Columbia Generating Station LRA-Severe Accident Mitigation Alternative Review

ML11214A237
Person / Time
Site:	Columbia
Issue date:	08/30/2011
From:	Dan Doyle License Renewal Projects Branch 2
To:	Swank D Energy Northwest
Doyle D, 415-3748
References
TAC ME3121
Download: ML11214A237 (5)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 August 30, 2011 Mr. David A. Swank Vice President, Engineering Columbia Generating Station Energy Northwest MD PE23 P. O. Box 968 Richland, WA 99352

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION SEVERE ACCIDENT MITIGATION ALTERNATIVE REVIEW (TAC NO. ME3121)

Dear Mr. Swank:

By letter dated January 19, 2010, Energy Northwest submitted an application to the U.S. Nuclear Regulatory Commission (NRC or the staff) to renew Operating License NPF-21 for Columbia Generating Station pursuant to Title 10 of the Code of Federal Regulations Part 54.

The NRC staff is reviewing the information contained in the license renewal application and the associated environmental report. The staff has identified, in the enclosure, areas where additional information is needed to complete the Severe Accident Mitigation Alternatives review.

Further requests for additional information may be issued in the future.

Items in the enclosure were discussed with Mr. Abbas Mostala. A mutually agreeable date for the response is within 30 days from the date of this letter. If you have any questions, please contact me at 301-415-3748 or bye-mail at daniel.doyle@nrc.gov.

Sincerely,

.~

Daniel Doyle, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-397

Enclosure:

As stated cc w/encl: Listserv

Request for Additional Information Regarding the Analysis of Severe Accident Mitigation Alternatives for the Columbia Generating Station License Renewal Review

Background:

In its letter dated January 28, 2011 (ADAMS Accession Number ML110330395), Energy Northwest identified Severe Accident Mitigation Alternative (SAMA) candidate FL-06R as potentially cost-beneficial.

In the January 28th letter, there were several different descriptions of SAMA FL-06R:

• "Add additional [nondestructive examination (NDE)] and inspections to increase probability of detecting degraded lines in raw water systems in the Control Building."

(page 6 of 173)

• "Improve control building flooding scenarios" (page 19 of 173)

• "Perform additional NDE and inspections to the three lines identified in SAM A candidate FL-04R to verify that degradation is not occurring in these lines. The specific locations of the NDE would be selected from potentially susceptible areas using similar methods as used in the risk-informed in-service inspection program to detect wall thinning."

(pages 119 and 120 of 173)

• "Perform additional NDE and inspections of the [service water (SW), turbine service water (TSW), and fire protection (FP)] lines in the Control Building area of the Radwaste Building." (page 167 of 173)

Issue:

Based on the descriptions of SAMA FL-06R, it appears to relate to managing the effects of aging.

Potentially cost-beneficial SAMAs that relate to adequately managing the effects of aging may be mandated by the NRC as part of license renewal pursuant to 10 CFR Part 54.

Requests:

RAI1:

Provide a determination as to whether the affected structures, systems, or components (SSCs) identified in the SAMA candidate are within the scope of the license renewal safety review under 10 CFR Part 54. If they are within the scope of license renewal, explain how the NDE and inspections proposed in SAMA FL-06R differ from the aging management programs proposed for the same SSCs in the safety portion of the license renewal application (e.g., SW and FP systems).

ENCLOSURE

- 2 RAI2:

The SAMAs listed below were identified as potentially cost-beneficial in the January 2Sth letter.

Energy Northwest stated that all these SAMA candidates will be considered for implementation through the normal processes for evaluating possible plant changes at Columbia Generating Station as described in response to RAI 6.j-1 iv. For each of the 16 potentially cost-beneficial SAMAs, provide a determination and rationale (basis) as to whether the SAMA relates to managing the effects of aging.

SAMAID SAMA Description ACIDC-2S Reduce common cause failures between EOG-3 and EOG-1/2 CC-03b Raise reactor core isolation cooling system backpressure trip setpoints FR-07a Improve the fire resistance of critical cables for containment venting FR-07b Improve the fire resistance of critical cables for transformer E-TR-6 FR-OS Improve the fire resistance of cables to residual heat removal and standby SW HV-02 Provide a redundant train or means of ventilation SR-05R Improve seismic ruggedness of MCC-7F and MCC-SF FL-05R Clamp on flow instruments to certain drain lines in the control building of the radwaste building and alarm in the control room FL-04R Add one isolation valve in the SW, turbine SW, and fire protection lines in the control building area of the radwaste building FL-06R Additional non-destructive evaluation and inspections to increase probability of detecting degraded lines in raw water systems in the Control Building CC-24R Backfeed the HPCS system with emergency bus SM-S to provide a third power source for HPCS CC-25R Enhance alternate injection reliability by including residual heat removal service water and fire water crosstie in maintenance program OT-07R Increase operator training on systems and operator actions determined to be important from the PSA FW-05R Examine the potential for operators to control reactor feedwater and avoid a reactor trip OT-09R For the non-LOCA initiating events, credit the Z (power conversion system recovery) function FR-11R Install early fire detection in the following analysis units: RC-02, RC-03, RC-04, RC-05, RC-07, RC-OS, RC-11, RC-13, RC-14, and RC-1A

ML11214a237 I OFFICE LA:DLR NAME IKing 8/29/11 8130/11

! DATE 8/4/11

Letter to D. Swank from D. Doyle dated August 30, 2011

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION SEVERE ACCIDENT MITIGATION ALTERNATIVE REVIEW (TAC NO. ME3121)

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