05000416/LER-1983-078, Updated LER 83-078/03X-2:on 830701,control Room Operator Unable to Maintain Air Receiver Pressure for Diesel Generator 11.Caused by Setpoint Drift & Damaged Valve Seals. Sensing Point to Air Receiving Tanks relocated.W/840330 L

Updated LER 83-078/03X-2:on 830701,control Room Operator Unable to Maintain Air Receiver Pressure for Diesel Generator 11.Caused by Setpoint Drift & Damaged Valve Seals. Sensing Point to Air Receiving Tanks relocated.W/840330 Ltr

ML20087P756
Person / Time
Site:	Grand Gulf
Issue date:	03/30/1984
From:	Byrd R, Dale L MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-84-0197, LER-83-078-03X, NUDOCS 8404090344
Download: ML20087P756 (4)

LER-2083-078, Updated LER 83-078/03X-2:on 830701,control Room Operator Unable to Maintain Air Receiver Pressure for Diesel Generator 11.Caused by Setpoint Drift & Damaged Valve Seals. Sensing Point to Air Receiving Tanks relocated.W/840330 Ltr

Event date:
Report date:
4162083078R00 - NRC Website

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Attachment to AECM-84/0197 Page 2 of 2 Supplementary Information to LER 83-078/03 X-2 Mississippi Power & Light Company Grand Gulf Nuclear Station - Unit 1 Docket No. 50-416 Technical Specification Involved: 3.8.1.2 Reported Under Technical Specification: 6.9.1.13.b Event' Narrative On July 1, 1983, operators were unable to maintain pressure in an air receiver for Diesel Generator 11 greater than 160 psig. A relief valve was passing air which prevented the compressors from restoring pressure to the tank.

The pressure sensing point for the compressor start /stop logic at that time was on a line between the two air receivers and did not always reflect true tank pressure. A false low pressure signal caused the compressor to operate continuously or cycle frequently. The type relief valve used allows a set-point drift when the valve lifts repeatedly.

In September 1983, Design Change 83/0261 relocated the sensing point to the air receiving tanks to provide a true reading. Compressor cycling was reduced significantly and the event has not recurred. This action is considered adequate to correct the root cause of the event. Material Non-Conformance Report (MNCR) 00503-83 was initiated to determine if additional corrective actions are required. None are planned at this time. This is submitted as a final report.

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E MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X, .18 4 0. g C QO N , M I S S I S S I P P I 3 9 2 0 5 March 30, 1984 NUCLEAR PRODUCTION DEPARTMENT U.S. Nuclear Regulatory Commission Region 11 101 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 - Air Receiver Pressure for Diesel Generator 11 not Maintained as Required by Technical Specifications LER 83-078/03 X-2 AECM-84/0197 This letter submits an update to a previous report submitted on October 5, 1983. The event for which the report was submitted occurred on July 1, 1983, when the Control Room operators were unable to maintain the air receiver pressure for Diesel Generator 11 greater than 160 psig as required by Technical Specification 4.8.1.1.2.a.7. Diesel Generator 12 was inoperable at that time due to a maintenance tag out of the SSW "B" Subsystem. Due to the inoperable status of the two diesel generators, Action (a) of Technical Specification 3.8.1.2 was entered. The event was reported pursuant to Technical Specification 6.9.1.13.b.

The purpose of this update is to revise the corrective action described in the previous update. This is a final report. Attached is LER 83-078/03 X ;2 with Supplementary Information.

Yours truly, L. F. Dale Manager of Nuclear Services EBS/SHH:rg Attachment cc: See next page Old'ICIAI, CDPV Member Middle South Utilities System j

d AECM-84/0197 I age 2 MISSISSIPPI POWER O LI2HT COMPANY 1

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)

.0ffice 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 9

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