05000416/LER-1983-021, Updated LER 83-021/01T-1:on 830519,determined That Standby Gas Treatment Sys Flow Monitoring Instrumentation Reading in Error.Caused by Incorrect Calibr Range Based on Postulated Instead of Std Conditions.Instruments Recalibr

Updated LER 83-021/01T-1:on 830519,determined That Standby Gas Treatment Sys Flow Monitoring Instrumentation Reading in Error.Caused by Incorrect Calibr Range Based on Postulated Instead of Std Conditions.Instruments Recalibr

ML20077F683
Person / Time
Site:	Grand Gulf
Issue date:	07/18/1983
From:	Byrd R, Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-83-0403, AECM-83-403, LER-83-021-01T, LER-83-21-1T, NUDOCS 8308010472
Download: ML20077F683 (4)

LER-2083-021, Updated LER 83-021/01T-1:on 830519,determined That Standby Gas Treatment Sys Flow Monitoring Instrumentation Reading in Error.Caused by Incorrect Calibr Range Based on Postulated Instead of Std Conditions.Instruments Recalibr

Event date:
Report date:
4162083021R00 - NRC Website

text

NRC FOR3 3ss Update Report-Previous Report Date 6/2/83 U. S. NUCLEAR NEGULATOny rviaannaggeOW (7 77) *

.. , LICEN8EE EVENT REPORT Attachment to AECM-83/0403

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Attachment to AECM-83/0403

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SUPPLEMENTARY INFORMATION TO LER 83-021/01 T-1 Mississippi Power & Light Company Grand Gulf Nuclear Station - Unit 1

' Docket No. 50-416 Technical' Specification Involved: 4.6.6.1.6.2 Reported Under. Technical Specification: 6.9.1.12.b Event Narrative:

-During performance of the Process Radiation Monitoring System Preoperational Test, it was noted that the. radiation monitoring flow instrumentation for .the Standby Gas Treatment System (SGTS) did not agree with the SGTS filter train exhaust flow indication. On May 19, 1983, it was determined that the filter train exhaust flow instrumentation was in error.

This error was a result of. incorrect calibration ranges which were based on postulated worst case conditions (approximately 162*F) rather than standard conditions. Due to this error, the flow instrumentation indicated a flow of approximately 29 (twenty-nine) percent lower than what actually existed. As a result, the Standby Gas Treatment System has not met the Technical Specification limit of 4,000 cfm maximum continuous exhaust flow as required by Technical. Specification 4.6.6.1.6.2 The SGTS is not required to be operable in the present operational condition (Cold Shutdown). The system'was considered operable,' however, during previous

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applicable plant operations. Therefore..the event is being reported pursuant to, Technical Specification 6.9.1.12.b. Based on analysis performed on the SGTS from July 14, 1982, to present, no releases of radioactive material.other than natural background have been detected.

~The instruments have been recalibrated and preliminary test show the instruments to be reading proper flow. Performance of the operability surveillance is pending approval of a Technical Specification change requested in PCOL-83/12 which revises the 0.25 inches'of vacuum water gauge required to 0.266 inches. The system will be restored to operability prior to entrance into an operational condition requiring secondary containment. This is submitted as a fins 1 report.

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• y E MISSISSIPPI POWER & LIGFIk DbMPAyY Helping Build Mississippi ' '  :. i[ 1 P. O. B O X 164 0, J A C K S O N, Mg SIS SIP PI 3 9 2 0 b' July 18, 1983 27

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4 g ', E9 Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-13 File 0260/L-835.0 Update Report - Standby Gas Treatment System Flow Monitoring Instrumentation Reading in Error LER 83-021/01 T-1 AECM-83/0403 This letter submits an update to a previous report submitted on June 2, 1983. The event for which the report was submitted occurred on May 19, 1983, when it was determined that the Standby Gas Treatment System flow monitoring instrumentation was reading in error such that the indicated flow was lower than the actual flow. This was due to an error made during initial calibration of the instrumentation. Therefore, the operability requirements of Technical Specification 4.6.6.1 (flow rate limits) were not met during applicable operational conditions.

The instruments have been recalibrated and preliminary tests show the instruments to be reading proper flow. Performance of the operability surveillance is pending approval of a Technical Specification change request which revises the 0.25 inches of vacuum water gauge required to 0.266 inches.

The system will be restored to operability prior to entrance into an operational condition requiring secondary containment. Attached is LER 83-021/01 T-1, which is a final report.

Yours truly, JPM: sap Attachment NIA8Nfj ec: (See Next Page) hylClAL CON Member Middle South Utilities System t

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AECM-83/0403 Pegs 2 MISSICCIPPI POWER O L12HT CSMPANY cc: Mr. J. B. Richard (w/a)

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

Mr. T. B. Conner (w/o) ^

Mr. G. B. Taylor _(w/o)

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

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Document Control Desk (w/a)

U. S. Nuclear Regulatory Commission Washington, D. C. 20555 4

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