AECM-88-0181, Special Rept 88-005/0:on 880829,post-accident Monitoring Instrument for Standby Gas Treatment B Subsystem Exhaust Declared Inoperable & Left Inoperable for More than 72 H. Caused by Time Spent to Procure Replacement Part

Special Rept 88-005/0:on 880829,post-accident Monitoring Instrument for Standby Gas Treatment B Subsystem Exhaust Declared Inoperable & Left Inoperable for More than 72 H. Caused by Time Spent to Procure Replacement Part

ML20154F413
Person / Time
Site:	Grand Gulf
Issue date:	09/12/1988
From:	Kingsley O SYSTEM ENERGY RESOURCES, INC.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-005-0, 88-5, AECM-88-0181, AECM-88-181, NUDOCS 8809190381
Download: ML20154F413 (2)

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70'/,~,%,, September 12, 1988 U. S. Nuclear Regulatory Comission Mail Station P1-137 Washington, D. C. 20555 Attention: Document Control Desk Gentlemen:

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 Special Report 88-005/0 Accident Monitor Inoperable for More Than 72 Hours AECM-88/0181 On August 29,1988 at 0300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />, the Post-Accident Monitoring instrument for the Standby Gas Treatment "B" subsystem exhaust was declued inoperable when the intermediate range noble gas activity channel failed a source check.

The check source is electrically inserted on demand via a remote computer comand tenninal . The source count rate moniter is actuated by a limit switch on the check source mechanism. The check source failed to produce a count rate on demand due to a failed limit switch.

There wera no qutlified replacement parts for the failed limit switch on-site.

The time required to procure an environmentally qualified replacement part caused the monitor to be inoperable for more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Action 81 of Technical Specification 3.3.7.5 requires the initiation of a preplanned alternate method of monitoring if the instrument is inoperable for more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

Procedure 06-CH-1D17-V-0058, "Ventilation Exhaust Accident Range Alternate Noble Gas, lodine, and Particulate Monitoring" requires grab samples to be obtained if certain plant conditions are met. Since the nonnal effluent monitoring instrumentation was functional during the time period, grab samples were not required to be taken.

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The monitor was restored to service on September 3 at 1400 after obtaining and installing a qualified replacement switch. Qualified spare limit switches have been procured and placed in the plant warehouse stock. This 14-day Special Report is submitted pursuant to Action 81 of Technical Specification 3.3.7.5 due to the instrument being inoperable for more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

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ODK:sig cc: Mr. T. H. Cloninger Mr. R. B. McGehee Mr. N. S. Reynolds Mr. H. L. Thomas Mr. J. L. Mathis Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Comission Region !!

101 Marietta St., N. W., Suite 2900 Atlanta, Georgia 30323 Mr. L. L. Kintner, Project Manager Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Comission Mail Stop 14B20 Washington, D.C. 20555 J14AECM88090801 - 2

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