05000315/LER-1981-001-04, /04L-0:on 810313 & 0224,unplanned & Unsampled Radioactive Gases Found Released.Caused by Excessive Leakage from Reciprocating Charging Pump Stuffing Box & Leaking Isolated Gas Decay Tank Valves

/04L-0:on 810313 & 0224,unplanned & Unsampled Radioactive Gases Found Released.Caused by Excessive Leakage from Reciprocating Charging Pump Stuffing Box & Leaking Isolated Gas Decay Tank Valves

ML17326A867
Person / Time
Site:	Cook
Issue date:	04/10/1981
From:	Rischling J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17326A868	List: 05000315/LER-1981-001-04, /04L-0:on 810313 & 0224,unplanned & Unsampled Radioactive Gases Found Released.Caused by Excessive Leakage from Reciprocating Charging Pump Stuffing Box & Leaking Isolated Gas Decay Tank Valves
References
LER-81-001-04L, LER-81-1-4L, NUDOCS 8104170533
Download: ML17326A867 (10)

LER-1981-001, /04L-0:on 810313 & 0224,unplanned & Unsampled Radioactive Gases Found Released.Caused by Excessive Leakage from Reciprocating Charging Pump Stuffing Box & Leaking Isolated Gas Decay Tank Valves

Event date:
Report date:
3151981001R04 - NRC Website

text

REGULORY INFORMATION. DISTRIBUTl SYSTEM, (RIBS)

ACCESSION NBR:81 041 70533 DOC ~ DATE'.: 81/04/10.

NOTARIZED:." NO FACIL".50 315'- Donald C'ook~ Nuclear>> Power>> Pl anti Unit" 1 P Indiana AUTH ~ NAME> AUTHOR. AFFILIATION RISCHL'ING<J',L".

Indiana>>

8 Michigan>> E'il ectr ic Co, RECIP.NAME~

RECIPIENT AFFILIATION.

Region-3P

Chicago, Office) of the.: Director-

SUBJECT:

LKR 81 "001/04L, 0:on 810313 8, 0224(unplanned 8

unsampl ed.

radioactive gases found released. Caused by excessive>

leakagelfrom; reciprocating, char ging pump stuffing box 8

leaking isolated>> gas decay tank valves;,

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'oots INDIANA& MICHIGANEIECTRIC COMPANY DONALDC. COOK NUCLEAR PLANT P.O. Box 468, Bridgman, Michigan 49106 (616) 466-6901 April 10, 1981 Mr. J.G. Keppler, Regional Director Office of Inspection and Enforcement United States Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 Operating License DPR-58 Docket No. 50-315

Dear Mr. Keppler:

Pursuant to the requirements of the Appendix B Technical Specifications the following report/s are submitted:

RO 81-001/04L-O.

Sincerely, D.V. Shaller Plant Manager

/bab cc:

J.E.

Dolan R.S. Hunter R.W. Jurgensen R.F. Kroeger R. Kilburn E.

Swanson/N.

DuBry RO:III R.C. Callen MPSC G. Charnoff, Esq.

J.M. Hennigan W. Lavallee EPRI PNSRC J.F. Stietzel E.L. Townley Dir., IE (20 copies)

Dir., MIPC (2 copies)

Directorate of Licensing

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U. S. NUCLEAR REGULATORY COMMISSION Ql (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 6 0

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10

~02 DURING NORMAL OPERATION, TWO EVENTS OCCURRED RESULTING IN UNPLANNED, UNSAMPLED

~03 RADIOACTIVE GASEOUS RELEASES.

A RELEASE ON. 02-24-81 WAS CAUSED BY EXCESSIVE LEAKAGE

~O4 FROM THE STUFFING BOX OF THE UNIT -

1 RECIPROCATING CHARGING PUMP.

ANOTHER RELEASE ON 03-13-81 WAS CAUSED BY LEAKING ISOLATION VALVES OF AN ISOLATED GAS DECAY TANK.

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THESE RELEASES OCCURRED WITHOUT THE SAMPLING AND ANALYTICALREQUIREMENTS OF APPENDIX-B T. S.

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Page 1 of 2 ATTACHMENT TO LER ¹81-001 04L-0 SUPPLEMENT TO CAUSE DESCRIPTION INVESTIGATION REVEALED THAT AT 2330 ON 02-23-81 R-26 (VENT RADIOGAS MONITOR)

BEGAN INCREASING AND AT 0310 ON 02-24-81 A HIGH ALARM WAS RECEIVED ON R-26.

IT WAS DETERMINED THAT THE CAUSE OF THE ALARM WAS THE LEAKAGE FROM THE RECIPROCATING CHARGING PUMP.

THE PUMP WAS TAKEN OUT OF SERVICE AT 0308 DUE TO EXCESSIVE LEAKAGE AT THE STUFFING BOX.

THE RECORDER INDICATES THAT R-26 STARTED DECREASING AFTER THE RECIPROCATING CHARGING PUMP WAS REMOVED FROM SERVICE.

THE STUFFING BOX OF THE CHARGING PUMP DRAINS TO THE CLEAN SUMP TANK WHICH IS VENTED TO THE AUXILIARYBUILDING VENTILATION SYSTEM.

I RELEASE',CALCULATIONS RELEASE KNOWN TO BE FRESH GASi 1.041 Ci OF Xe-133 WAS RELEASED AT A RATE OF 7.23 E-'

Ci PER SECOND.

THIS IS.1215/

OF THE NOBLE GAS TECHNICAL SPEC-IFICATION LIMITS.

THE MAXIMUM RELEASE RATE WAS DETERMINED TO BE 7.348 E-4 Ci PER SECOND OR 1.2354 OF THE NOBLE GAS TECHNICAL SPECIFICATION LIMIT.

THIS EVENT WAS DETERMINED TO BE REPORTABLE ON 03-23-81, FOLLOWING A REVIEW OF THE INVESTIGATION REPORT AND DISCUSSION WITH THE NRC RESIDENT INSPECTOR.

THE SECOND UNPLANNED RELEASE OCCURRED WHEN NO.

3 GAS DECAY TANK (GDT)

WAS ISOLATED FOR GAS DECAY PURPOSES ON 02-03-81 AT 97 PSIG.

ON 03-13-81 TANK PRESSURE WAS FOUND TO BE 53 PSIG.

THE REMAINDER OF THIS GDT WAS RE-LEASED ON 03-13-81 TO ALLOW FOR THE REPAIR OF THE ISOLATION VALVES, MANUFAC-TURED BY GRINNEL-DRAWING NO.

WREF-3-CS.

THE VALVE DIAPHRAMS WERE REPLACED AND THE GDT WAS RETURNED TO SERVICE.

EXAMINATION OF THE DIAPHRAMS WHICH

4 I

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WERE REMOVED, REVEALED INDENTATIONS, WHICH MAY HAVE PROVIDED A LEAKAGE PATH FOR THE GAS.

THIS GAS DECAY TANK WAS ONE OF TWO RECENTLY INSTALLED FOR RFC 12-2196.

RELEASE CALCULATIONS Xe-133 Xe-131M Kr-85 I-133 2.73 E-4 pCi/cc 7.84 E-5 pCi/cc 9.17 E-4 pCi/cc 2.82 E-9 pCi/cc FOR A TOTAL OF 6.74 x E-2 TOTAL CURIES AT 5.12 x E-5/.

OF TECHNICAL SPECIFICATION LIMITS FOR NOBLE GASSES AND 1.51 x E-4 CURIES OF IODINE 133 AT 6.86 x E-7X OF TECHNICAL SPECIFICATIONS.

THESE RESULTS ARE BASED ON ANALYSIS PERFORMED 3-13-81 ON THE REMAINDER OF THE TANK.

SINCE IT HAD BEEN "ISOLATED" IT IS ASSUMED ONLY OUTLEAKAGE OCCURRED AND NO INLEAKAGE INTO THE TANK.

AN ADDITIONAL LEAK TEST WAS ALSO PERFORMED ON THE OTHER GDT RECENTLY INSTALLED, TO INSURE SIMILAR PROBLEMS DID NOT EXIST WITH THE ISOLATION VALVES.

IN THE FUTURE, SIMILAR UNPLANNED RELEASES SHOUL'DBE DETECTED QUICKLY AS OPERATIONS DEPARTMENT HAS MODIFIED PLANT PROCEDURES REQUIRING A CLEARANCE TAG ON THE GDT'S WHEN EACH IS ISOLATED FOR DECAY PURPOSES, AND THE PRESSURE INDICATION FOR THE ISOLATED TANK IS MARKED SUCH THAT ANY DECREASE IN GDT PRESSURE IS EASILY IDENTIFIABLE.

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