05000416/LER-1986-014, :on 860411,failure to Perform Nonroutine Surveillance Retest for motor-operated Isolation Valve Thermal Overload Bypass Circuitry Identified.Caused by Procedural Error.Procedure Will Be Revised

:on 860411,failure to Perform Nonroutine Surveillance Retest for motor-operated Isolation Valve Thermal Overload Bypass Circuitry Identified.Caused by Procedural Error.Procedure Will Be Revised

ML20205P624
Person / Time
Site:	Grand Gulf
Issue date:	05/16/1986
From:	Byrd R, Kingsley O MISSISSIPPI POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
AECM-86-0152, AECM-86-152, LER-86-014, LER-86-14, NUDOCS 8605210484
Download: ML20205P624 (4)

LER-1986-014, on 860411,failure to Perform Nonroutine Surveillance Retest for motor-operated Isolation Valve Thermal Overload Bypass Circuitry Identified.Caused by Procedural Error.Procedure Will Be Revised

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
4161986014R00 - NRC Website

text

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On April 16, 1985, during the closecut review of a maintenance work order, a maintenance planner identified a failure to perform a nonroutine surveillance retest for a motor operated isolation valve's thermal overload bypass circuitry.

The thermal overload relay for the motor operator of a drywell chemical waste sump discharge isolation valve was replaced on April 9, 1986.

The thermal l

overload protection for the valve motor is required to be continuously bypassed, i

Technical Specification 4.8.4.2.1.c requires this condition to be verified following maintenance on the motor starter.

Due to a procedural error this requirement was not included in the work package retest requirements.

The surveillance retest was performed on April 16, 1986 and verified the thermal i

overload protection to be continuously bypassed.

The Test and Retest Control procedure will be revised and the importance of proper and complete reviews of surveillance retest requirements was emphasized to maintenance planners.

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REPORTABLE OCCURRENCE On April 16, 1986, during the closecut review of a maintenance work order (MW0), a maintenance planner identified a failure to perform a nonroutine Technical Specification surveillance requirement for a motor operated valve's thermal overload bypass circuitry. This report is submitted pursuant to 10CFR50.73(a)(2)(i)(B).

B.

INITIAL CONDITIONS The plant was operating in mode 1 at approximately 65 percent power.

C.

DESCRIPTION OF OCCURRENCE Certain motor operated valves have thermal overload protection which is either continuously bypassed and placed in force only when the valve motors are undergoing testing or normally in force during plant operation and bypassed under accident conditions. Technical Specification 4.8.4.2.1.c requires verification that the thermal overload protection is continuously bypassed or bypassed under accident conditions, as applicable, following maintenance on motor starters.

The thermal overload relay for the motor operator of valve P45-F096, a Drywell Chemical Waste Sump Discharge Isolation Valve, was replaced on April 9, 1986 while the plant was in Cold Shutdown. The valve's thermal overload protection is required to be continuously bypassed.

Plant restart commenced on April 11, 1986. On April 16, 1986, during the closecut review of the work package a maintenance planner noted that the surveillance required by Technical Specification 4.8.4.2.1.c had not been included in the MWO retest requirements.

Operations declared the bypass circuitry inoperable and entered a Limiting Condition for Operation (LC0) at 0900 on April 16, 1986. The surveillance was then performed which verified that the thermal overload protection was bypassed.

The LC0 was cleared at 1330 on April 16, 1986.

The event actually occurred on April 11, 1986 when the isolation valve was first required to be operable following the work, but was not discovered until April 16, 1986 as a result of the final reviews of the completed work package.

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APPARENT CAUSE TheTestandRetestdontrolprocedure,01-S-07-2,providesatableof special retest requirements identified in the Technical Specifications.

The table included the requirements of Technical Specification 4.8.4.2.1.C for "specified motor operated valves".

To determine which motor operated valves are applicable to this requirement, the planner must review either the Technical Specifications or the surveillance procedure which is used to perform the test. The planner reviewed the only surveillance procedure referenced in the Test and Retest Control procedure for implementing the requirement. However, this surveillance procedure, 06-EL-1R65-Q-1001, was only for the valves with thermal overload protection normally in force. The correct procedure, 06-EL-1R65-R-0001, for continuously bypassed overload protection was not referenced by the Test and Retest Control procedure. Because valve P45-F096 was not listed in 06-EL-IR65-Q-1001, the planner concluded that the requirement was not applicable.

E.

SUPPLEMENTAL CORRECTIVE ACTION Procedure 01-S-07-2 will be revised to reference the surveillance procedure used to verify that thermal overload protection is continuously bypassed. The importance of proper and complete reviews of surveillance retest requirements for MW0's was emphasized to maintenance planners.

F.

SAFETY ASSESSMENT

The thermal overload bypass was in effect when its operability was required. The redundant isolation valve was also operable. The isolation function of the valve was not degraded by the missed surveillance.

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f MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi RetiltMddB P. O. B O X 16 4 0. J A C K S O N. MIS SIS SIP PI 39215-1G40 May 16, 1986 O. D. KINGSLEY, J R.

VICE PREllDENT NUCLEAR OPER ATIONS Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Gentlemen:

SUBJEC':

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 File: 0260/L-835.0 Nonroutine Surveillanca Retest Performed Late LER 86-014-00 AECM-86/0152 Attached is Licensee Event Report (LER) 86-014-00 which is a final report.

Yours ly, ODX:lm Attachment cc:

Mr. T. H. Cloninger (w/a)

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

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

Mr. H. L. Thomas (w/o)

Mr. R. C. Butcher (w/a)

Mr. James M. Taylor, Director (w/a)

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Dr. J. Nelson Grace, Regional Administrator (w/a)

U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N. W., Suite 2900 Atlanta, Georgia 30323 Y

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