ML17059C548

Discusses Completion of Review Re Bulletin 96-03, Potential Plugging of ECCS Strainers by Debris in Bwrs, Issued on 960506

ML17059C548
Person / Time
Site:	Nine Mile Point
Issue date:	01/05/1999
From:	Hood D NRC (Affiliation Not Assigned)
To:	Mueller J NIAGARA MOHAWK POWER CORP.
References
IEB-96-003, IEB-96-3, TAC-M96158, NUDOCS 9902090313
Download: ML17059C548 (14)

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Mr. John H. Mueller Chief Nuclear Officer Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Operations Building, Second Floor Lycoming, NY 13093

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&0001 january 5, 1999

SUBJECT:

COMPLETION OF REVIEW REGARDING BULLETIN96-03, "POTENTIAL PLUGGING OF EMERGENCY CORE COOLING SUCTION STRAINERS BY DEBRIS IN BOILING-WATERREACTORS," NINE MILE POINT NUCLEAR STATION, UNIT2 (TAC NO. M96158)

On May 6, 1996, the,U.S. Nuclear Regulatory Commission (NRC) issued Bulletin 96-03, "Potential Plugging of Emergency Core Cooling Suction Strainers by Debris in Boiling-Water Reactors" to all holders of operating licenses or construction permits for boiling-water reactors (BWRs). The NRC issued Bulletin 96-03 to ensure that the emergency core cooling systems (ECCS) in BWRs can perform their intended safety function to mitigate the effects of'a postulated loss-of-coolant accident.

The Bulletin provided three options for resolving this issue including (1) installation of large capacity passive strainers, (2) installation of self-cleaning strainers, or (3) installation of a backflush system.

In Bulletin 96-03, the NRC staff specifically requested that licensees submit the following reports for each of their plants:

1.

A description of planned actions and mitigative strategies to be used, the schedule for implementation, and proposed technical specifications, ifappropriate.

2.

A report confirming completion and summarizing actions taken.

In a letter dated November 4, 1996, Niagara Mohawk Power Corporation (NMPC),responded to Bulletin 96-03 for Nine Mile Point Nuclear Station, Unit 2 (NMP2), stating that NMPC planned to evaluate the adequacy of the existing NMP2 strainer design using the guidance in the Boiling Water Reactor Owners Group's document "UtilityResolution Guidance (URG) for Resolution of ECCS Suction Strainer Blockage." The NRC staff reviewed the URG and issued a safety evaluation on August 20, 1998.

By letter dated January 6, 1999, NMPC informed-the NRC staff that NMP2's strainer design, evaluated using the URG document, had been unsuccessful, and thus, during the 1998 refueling outage, NMPC replaced the strainers with

'ew strainers designed by General Electric using the guidance provided in the URG. In the January 6, 1999, letter, NMPC further stated that all actions requested by Bulletin 96-03 are complete.

These actions included:

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Inspecting and cleaning the suppression pool (in response to related Bulletin 95-02, I

"Unexpected Clogging of a Residual Heat Removal (RHR) Pump Strainer While Operating in Suppression Pool Cooling Mode").

2.

Issuing procedures and conducting training in foreign material exclusion practices (in response to Bulletin 95-02).

3.

Installing new large capacity strainers using the guidance provided in the URG (in response to Bulletin 96-03).

We have reviewed NMPC's response and have determined that the actions taken should

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minimize the potential for clogging of ECCS suction strainers and ensure the capability of the ECCS to provide long-term cooling following a loss-of-coolant accident as required by 10 CFR 50.46. We note that General Electric's topical report NEDC-32721P, "Application Methodology for the General Electric Stacked Disk ECCS Suction Strainer" is still undergoing our review.

Part I of our safety evaluation of the GE topical report was issued on February 3, 1999, approving GE's methodology for determining strainer head loss.

However, the GE methodology for calculating strainer structural loadings due to hydrodynamic forces continues under staff review, and part II of our safety evaluation will be issued upon completion.

However, we consider NMPC's actions for NMP2 responsive to the concerns raised in Bulletin 96-03 and no plant-specific concerns have been identified. Therefore, we are closing TAC No.

M96158 which provided for our review of NMPC's response to Bulletin 96-03 for NMP2. Ifour further generic review of the GE topical report should determine the need for plant-specific information, that information would be requested under a separate TAC.

Ifyou have any questions regarding this letter, contact me by phone on (301) 415-3049 or by electronic mail at dsh@nrc.gov.

Sincerely, Docket No. 50-410 cc: See next page Darl S. Hood, Senior Project Manager Project Directorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation DISTRIBUTION:

Docket File PUBLIC PDI-1 Reading File J. Zwolinski S. Bajwa R. Lobel R. Elliot ACRS D. Skay C. Berlinger D. Hood S. Little G. Shear OGC R. Blough, Region I

DOCUMENT NAME: G>NMP2UMPA96158

• See Previous Concurrence To receive a co ofthis document. indicate In the box: "C" = Co without enclosures "E" ra Co with enclosures "N" re No co OFFICE DATE PH: PDI-1 DHood:lcc 5(f

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-'. -, '. H. Mueller February g 1999 1.

Inspecting and cleaning the suppression pool (in response to related Bulletin 95-02, "Unexpected Clogging of a Residual Heat Removal (RHR) Pump Strainer While Operating in Suppression Pool Cooling Mode").

2.

Issuing procedures and conducting training in foreign material exclusion practices (in response to Bulletin 95-02).

3.

Installing new large capacity strainers using the guidance provided in the URG (in response to Bulletin 96-03).

We have reviewed NMPC's response and have determined that the actions taken should minimize the potential for clogging of ECCS suction strainers and ensure the capability of the ECCS to provide long-term cooling following a loss-of-coolant accident as required by 10 CFR 50.46. We note that General Electric's topical report NEDC-32721P, "Application Methodology for the General Electric Stacked Disk ECCS Suction Strainer" is still undergoing our review.

Part I of our safety evaluation of the GE topical report was issued on February 3, 1999, approving GE's methodology for determining strainer head loss.

However, the GE methodology for calculating strainer structural loadings due to hydrodynamic forces continues under staff review, and part II of our safety evaluation willbe issued upon completion.

However, we consider NMPC's actions for NMP2 responsive to the concerns raised in Bulletin 96-03 and no plant-specific concerns have been identified. Therefore, we are closing TAC No.

M96158 which provided for our review of NMPC's response to Bulletin 96-03 for NMP2. Ifour further generic review of the GE topical report should determine the need for plant-specific information, that information would be requested under a separate TAC.

Ifyou have any questions regarding this letter, contact me by phone on (301) 415-3049 or by electronic mail at dsh@nrc.gov.

Sincerely, Docket No. 50-410 cc: See next page Darl S. Hood, Senior Project Manager Project Directorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation DISTRIBUTION:

Docket. File PUBLIC PDI-1 Reading File J. Zwolinski S. Bajwa R. Lobel R. Elliot ACRS D. Skay C. Berlinger D. Hood S. Little G. Shear OGC R. Blough, Region I

• See Previous Concurrence Co without enclosures "E" ~ Co with enclosures "N" ~ No co DOCUMENT NAME: G iNMP2WIPA96158 To receive a co ofthis document. indicate ln the box: "C" =

OFFICE PM: PDI -1 LA:PDI-1 BC:SCSB*

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/99 NAME DHood: 1 ccats(f SLittle CBerlinger 02/02/99",

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J. H. Mueller 1.

Inspecting and cleaning the suppression pool (in response to related Bulletin 95-02, "Unexpected Clogging of a Residual Heat Removal (RHR) Pump Strainer While Operating in Suppression Pool Cooling Mode").

2.

Issuing procedures and conducting training in foreign material exclusion practices (in response to Bulletin 95-02).

3.

Installing new large capacity strainers using the guidance provided in the URG (in response to Bulletin 96-03).

We have reviewed NMPC's response and have determined that the actions taken should minimize the potential for clogging of ECCS suction strainers and ensure the capability of the ECCS to provide long-term cooling following a loss-of-coolant accident as required by 10 CFR 50.46. We note that General Electric's topical report NEDC-32721P, "Application Methodology for the General Electric Stacked Disk ECCS Suction Strainer" is still undergoing our review.

Part 1 of our safety evaluation of the GE topical report was issued on February 3, 1999, approving GE's methodology for determining strainer head loss.

However, the GE methodology for calculating strainer structural loadings due to hydrodynamic forces continues under staff review, and part II of our safety evaluation willbe issued upon completion.

However, we consider NMPC's actions for NMP2 responsive to the concerns raised in Bulletin 96-03 and no plant-specific concerns have been identified. Therefore, we are closing TAC No.

M96158 which provided for our review of NMPC's response to Bulletin 96-03 for NMP2. Ifour further generic review of the GE topical report should determine the need for plant-specific information, that information would be requested under a separate TAC.

Ifyou have any questions regarding this letter, contact me by phone on (301) 415-3049 or by electronic mail at dsh@nrc.gov.

Docket No. 5(4410 cc: See next page Sincerely,

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Darl S. Hood, Senior Project Manager Project Directorate I-1 Division of Reactor Projects - I/II.

Office of Nuclear Reactor Regulation

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John H. Mueller Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Unit No. 2 CC:

Regional Administrator, Region I

U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Resident Inspector Nine Mile Point Nuclear Station P.O. Box 126 Lycoming, NY 13093 Mr. Jim Rettberg NY State Electric 8 Gas Corporation Corporate Drive Kirkwood Industrial Park P.O. Box 5224 Binghamton, NY 13902-5224 Mr. John V. Vinquist, MATS Inc.

P.O. Box 63 Lycoming, NY 13093 Supervisor Town of Scriba Route 8, Box 382 Oswego, NY 13126 Mr. Richard Goldsmith Syracuse University College of Law E.l. White Hall Campus

Syracuse, NY 12223 Charles Donaldson, Esquire Assistant Attorney General New York Department of Law 120 Broadway New York, NY 10271 Mr. Timothy S. Carey Chair and Executive Director State Consumer Protection Board 5 Empire State Plaza, Suite 2101 Albany, NY 12223 Mark J. Wetterhahn, Esquire Winston & Strawn 1400 L Street, NW.

Washington, DC 20005-3502 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West

Syracuse, NY 13202 Mr. F. William Valentino, President New York State Energy, Research, and Development Authority Corporate Plaza West 286 Washington Avenue Extension Albany, NY 12203-6399

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Nine Mile Point, Unit 2 Pre-outage Review of Previous Outage Inspection Data on Feedw ater Nozzle to Safe-end Weld Revealed an Indication, Licensee Event Report 00-03 Body:

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