05000416/LER-1984-020, Revised LER 84-020-01:on 840423,24 & 0514,during Startup, Five Reactor Water Cleanup Sys Isolations Occurred Due to Feedwater Flow Oscillations

Revised LER 84-020-01:on 840423,24 & 0514,during Startup, Five Reactor Water Cleanup Sys Isolations Occurred Due to Feedwater Flow Oscillations

ML20091P370
Person / Time
Site:	Grand Gulf
Issue date:	06/06/1984
From:	Dale L, Parker J MISSISSIPPI POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
AECM-84-0300, AECM-84-300, LER-84-020, LER-84-20, NUDOCS 8406130039
Download: ML20091P370 (3)

LER-2084-020, Revised LER 84-020-01:on 840423,24 & 0514,during Startup, Five Reactor Water Cleanup Sys Isolations Occurred Due to Feedwater Flow Oscillations

Event date:
Report date:
4162084020R00 - NRC Website

text

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Attachment to AECM-84/0300 NRC Form 300 U.S. NUCLEAM KEGULATOKY COMMISSION M3' Aprii;OvtD Ous NO 3160-4104 v.lCENSEE EVENT REPORT (LER)

FACILITV NAME (1) DOCKET NUMBER (21 PAGE (3)

Grand Gulf Nuclear Station - Unit 1 015101010 l4 l 116 1 lOFl 012 TITLE (48 Reactor Water Cleanup System Isolation EVENT DATE (S) LER NUMBER (S) REPORT DATE 17) OTHER F ACILITIES INVOLVED (S)

SEQ eAL P ACILITY N AMES DOCKET NUMBER ($)

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, MONTH DAY YEAR NA 0 151010101 1 1

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0l4 2l 3 84 8l4 0l 2l 0 0l 1 0l6 0l6 8l 4 0 1 51 0 1 0 1 0 1 I I THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF to CFR $: ICheck one or more of the fonewing; (til OPE RAtlNG 2 20A02(bl to 40stel

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NAME TELEPHONE NUMBER AREA CODE Jerry L. Parker / Licensing Engineer 6;Og1 4,3 g 7 l- l 2i l 94l9 COMPLETE ONI LINE FOR EACM COMPONENT FAILURE DESCRICED IN TMit REPORT (13)

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I I I I I I I I I I I I I I SUPPLEMENTAL REPORT EXPECTED ties MONTH DAY YEAR SUBMi$3 SON YES (It ve., cow EXPECTED SVOatl5SION CA TE) NO l l l A TR ACT w, M <= -e.u. -, an.e. e ,,-,l me., n ei On April 23, 24 and May 14, 1984, during Startup, five Reactor Water Cleanup System (RWCU) isolations occurred due to feedwater flow oscillations. The flow oscillations caused the RWCU leak detection system to sense a differen-tial flow indicative of a leak and this signaled the RWCU containment isola-tion valves to close.

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. . Attachment to AECM-84/0300 I NRC Form 3eeA U S NUCLEGO CEGULOTOQY COMMIS$10N LICENSEE EVENT REPOFiT (LER) TEXT CONTINUATION AreaovEO ous =o 3:504:o4 EXPRES 8/31/85 PACILITY NAME (1) DOCKET NUMSER (2) LER NUMSER (S) PAGE(3)

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fut*,'N OF Grand Gulf Nuclear Station - Unit 1 0 l5 l0 l0 lo l 4l1 l 6 814 0l2 l 0 -

0l1 0 l2 0 l2 rExt nr . , -wei.,-ass 4w nn On April 23, 24 and May 14, 1984, five Reactor Water Cleanup System (RWCU) isolations occurred due to feedwater flow oscillations. The plant was in Startup which commenced on April 22, 1984.

The RWCU return line to the reactor vessel connects to the feedwater injection line between the vessel check valves and the startup level control valve which regulates feedwater flow. During startup, low feedwater flow or flow perturba- '

tions causes the level control valve to cycle. The closing of the level control valve also allows the vessel check valves to close. The result is that the RWCU leak detection system senses a differential flow between the system inlet flow and the outlet flow indicating a leak and thus automatically closes the RWCU containment isolation valves.

During startup at low power levels feedwater flow is minimal and flow perturba-tions can be expected. While in the Startup lesting phase, at such low power level, these occurrences are considered normal.

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E MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 16 4 0. J A C K S O N, MIS SIS SI P PI 3 9 2 0 5 June 6, 1984 NUCLEAR PRODbCTION DEPARTMENT Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Centlemen:

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-13 File: 0260/L-835.0 Reactor Water Cleanup System Isolation LER 84-020-1 AECM-84/0300 Attached is Licensee Event Report (LER) 84-020-1 which is a final report.

This revision is submitted for the purpose of including one additional Reactor Water Cleanup (RWCU) System isolation which occurred due to feedwater flow oscillations during the 30 day time period following the initial RWCU isolation.

Yours truly, L. F. Dale Director of Nuclear Licensing & Safety EBS/SHH:rg Attachment cc: Mr. J. B. Richard (w/a)

Mr. R. B. McGehee (w/o)

Mr. N. S. Reynolds (w/o)

Mr. C. B. Taylor (w/o)

Mr. Richard C. DeYoung, Director (w/a)

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. J. P. O'Reilly, Regional Administrator (w/a)

U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30303 Member Middle South Utilities System ) g