05000416/LER-1983-169, Corrected LER 83-169/03X-1:on 831023,nitrogen Pressure Control Rod Scram Accumulators 40-53 & 24-29 Fell Below Tech Specs.Caused by Normal Leakage.Accumulators Recharged.W/ 840321 Ltr

Corrected LER 83-169/03X-1:on 831023,nitrogen Pressure Control Rod Scram Accumulators 40-53 & 24-29 Fell Below Tech Specs.Caused by Normal Leakage.Accumulators Recharged.W/ 840321 Ltr

ML20087P400
Person / Time
Site:	Grand Gulf
Issue date:	03/21/1984
From:	Byrd R, Dale L MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-84-0170, AECM-84-170, LER-83-169-03X-01, LER-83-169-3X-1, NUDOCS 8404060386
Download: ML20087P400 (3)

LER-2083-169, Corrected LER 83-169/03X-1:on 831023,nitrogen Pressure Control Rod Scram Accumulators 40-53 & 24-29 Fell Below Tech Specs.Caused by Normal Leakage.Accumulators Recharged.W/ 840321 Ltr

Event date:
Report date:
4162083169R00 - NRC Website

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g l accumulators 40^53 and 24-29 fel1 below 1520 psig. An atcumulator j .

.ol4l l trouble alarm was received on accumulator 24-29 but not on accumulator l

,t l5] l,40-53. The low pressuee in 40-53 was found by thrt weekly sur vei l l anc e_. l ITTe b 1,The required alarm setpoint is 1520 +30, -O psig on decreasing pressure.1

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,r T {y] [ A n LCO was entered pursuant to T.S.3.1.3.3. The accumulators were re- l o , geharged within 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. This is reported pursuant to T.S.6.9.1.13.b. l

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- ] (The low pressure is attributed to normal leakage. The pressure switch go 3

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to operate correctly. This test was repeated in February and the set- 3 gp oint had not drifted. The failure to alarm is nct repeatable and is g onsidered an isolated event. This is a final report. g a

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, , , .. = .. =s o Ron Byrd ..

o NAME OF PREPARER PHONE- i,

N MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. BOX 1840. J ACKSON. MISSISSIPPI 39205 March 21, 1984 CORRECTED COPY wuctuan enoouenon oseantment 4g3 A 3 *. 4 0 In the second sentence of U.S. Nuclear Regulatory Commission letter, 24-59 should have been 24-29, 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 Licerac No. NPF-13 File: 0260/L-835.0 Update Report - Low Nitrogen Pressure in Control Rod Scram Accumulators LER 83-169/03 X-1 AECM-84/0170 This letter submits an update to a previous report submitted on November 22, 1983. The event for which the report was submitted occurred on October 23, 1983, when the nitrogen pressure in control rod scram accumulatcrs 40-53 and 24-29 iell below 1520 psig. An accumulator trouble alarm was received on accumulator 24-29 but not on accumulator 40-53. The required alarm setpoint is 1520 + 30. -0 psig on decreasing pressure. A Limiting Condition for Operation was entered pursuant to Technical Specification 3.1.3.3. This was reported pursuant to Technical Specification 6.9.1.13.b.

Our investigation into the cause of the alarm failure for accumulator 40-53 is complete. Attached is LER 83-169/03 X-1 which is a final report.

Yours truly, L. F. Dale Manager of Nuclear Services EBS/SHH rg Attachment cc: See next page OFFICI AL COPi, .

74 E E DESIGNATED ORIGINAL Cortified By

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AECM-84/0170 "I*

MISSISSIPPI POWER & LIGHT COMPANY 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 Comission Washington, D. C. 20555 Document Control Desk (w/a)

U. S. Nuclear Regulatory Comission Washington, D. C. 20555 s