ML20128N146

Ack Receipt of Util Response to Generic Ltr 92-04, Resolution of Issues Re Reactor Vessel Water Level Instrumentation in BWR,

ML20128N146
Person / Time
Site:	Cooper
Issue date:	02/19/1993
From:	Rood H Office of Nuclear Reactor Regulation
To:	Horn G NEBRASKA PUBLIC POWER DISTRICT
References
GL-92-04, GL-92-4, TAC-M84275, NUDOCS 9302230085
Download: ML20128N146 (4)

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i UNITED STATES 3 ,i NUCLEAR REGULATORY COMMISSION

• Wt SHINGToN, D.C. 20656 February 19, 1993 Docket No. 50-298 1

Mr. Guy R. Horn Nuclear Power Group Manager Nebraska Public Power District Post Office Box 499 Columbus, Nebraska 68602-0499

SUBJECT:

RESPONSE TO GENERIC LETTER 92-04, " RESOLUTION OF THE ISSUES RELATED TO REACTOR VESSEL WATER LEVEL INSTRUMENTATION IN BOILING WATER REACTORS" - COOPER NUCLEAR STATION (TAC NO. H84275)

This letter acknowledges receipt of your response to Generic Letter (GL) 92-04, dated September 28, 1992. GL 92-04 was issued by letter dated August 19, 1992, to all operating Boiling Water Reactor (BWR) licensees.

GL 92-04 requested licensees to promptly assess the impact on their facilities of potentially erroneous level indication due to non-condansible gases and to implement compensatory measures and long-term corrective actions as necessary.

We find acceptable:

(1) The review by the Nebraska Public Power District (NPPD) of the BWR Owners' Group (DWROG) generic analysis and NPPD's acceptance of the analysis as applicable to the Cooper Nuclear Station (CNS).

(2) NPPD's endorsement of the BWROG commitment, outlined in the BWROG 1etter dated August 12, 1992, regarding schedule and plans for actions to address postulated errors in BWR water level instrumentation.

(3) NPPD's endorsement of the August 19, 1992, guidance letter by the Emergency Procedures Committee of the BWROG. This letter provides guidance for operator action in the event of level indication errors due to non-condensible gases during reactor pressure vesseel (RPV) depressurization. We also understand that you have sensitized your operators to these potential errors consistent with the BWROG guidance.

(4) hPPD's commitment to implement the longer-term BWROG finding resulting from the BWROG experimental and analytical programs on a schedule consistent with the BWROG program, as documented in the BWROG letter of August 12, 1992, and discussed at the October 29, 1992, meeting with the NRC.

On October 23, 1992, the BWROG approved the refined operator guidance, developed by the Emergency Procedures Committee, that had been sent to your

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"._. Mr. Guy R.- Horn Operations Superintendent on October 16, 1992, for response to instrument errors due to non-condensible gases. We feel that this guidance provides appropriate information for operators to adequately' identify and deal with L potentially inaccurate RPV level instrumentation, and expect that this or equivalent guidance has been incorporated into your station operations.

Should you have any questions, please contact me at (301) 504-1352.

Sincerely, A >

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t Harry od, Senior Project Manager Project Directorate-IV-1 Division of Reactor. Projects - III/IV/V Office of Nuclear Reactor Regulation cc: See next page I

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Mr. Guy R. Horn

,* Nuclear Power Group Manager Cooper Nuclear Station cc:

Mr. G. D. Watson, General Counsel Nebraska Public Power District P. O. Box 499 Columbus, Nebraska 68602-0499 Cooper Nuclear Station ATTN: Mr. John M. Meacham Site Manager P. O. Box 98 Brownville, Nebraska 68321 Randolph Wood, Director Nebraska Department of Environmental Control P. O. Box 98922 Lincoln, hebraska 68509 8922 Mr. Richard Moody, Chairman Nemaha County Board of Commissioners Nemaha County Courthouse 1824 N Street Auburn, Nebraska 68305 Senior Resident Inspector U.S. Nuclear Regulatory Commission P. O. Box 218 Brownville, Neuraska 68321 Regional Administrator, Regior. IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Mr. Harold Borchert, Director t Division of Radiological Health [

Nebraska Department of Health '

301 Centennial Hall, South P. O. Box 95007 Lincoln, Nebraska 68509-5007 I l

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-t Mr. Guy R. Horn i

Operations Superintendent on October 16, 1992, for response to instrument errors due to non-condensible gases. We feel that this guidance provides appropriate info 1 nation for operators to adequately identify and deal with i potentially inaccurate RPV level instrumentation, and expect that this or .

j equivalent guidance has been. incorporated into your station operations.

Should you have any questions, please contact me at (301) 504-1352.

Sincerely, i

! /S/

Harry Rood, Senior Project' Manager 4

Project Directorate IV-1

! Division of Reactor Projects - III/IV/V i Office of Nuclear Reactor Regulation j

cc: See next page <

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! DISTRIBUTIO!f:

. Docket File

NRC & Local PDRs

PD4-1 Reading P. Noonan l H. Rood G. Hubbard l H. Virgilio i J. Roe ACRS (10)(P315)

OGC (15B18)

PD4-1 Plant File J. Clifford j R. Jones

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OFFICIAL RECORD COPY Document Name: C0084275.LTR 4

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