ML20009D662

Updated LER 81-001/04X-1:on 810224 & 0313,gas Found Leaking from Stuffing Box of Unit 1 Reciprocating Charging Pump & from Isolation Valves of Gas Decay Tank.Second Release Caused by Indentations in Valve Diaphragms

ML20009D662
Person / Time
Site:	Cook
Issue date:	07/16/1981
From:	Rischling J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009D658	List: ML20009D657 ML20009D662 ML20009D667
References
LER-81-001-04X, LER-81-1-4X, NUDOCS 8107240260
Download: ML20009D662 (3)

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" UPDATE REPORT - PREVIOUS REPORT DATE 4/10/81"-- -- - -- --~ - --

LICENSEE EVENT REPORT (PLEASE PAINT OR TYPE ALL REQUIRED INFORMATION)

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REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h iOIal lDURING NORMAL OPERATION, TWO EVENTS OCCURRED RESULTING IN UNPLANRED, UNSAMPLED l

[ g T'il I RADIle,CTIVE GASE0US RELEASES. A RELEASE ON 02-24-81 WAS CAUSED BY EXCESSIVE LEAKAGE l

[3 p;-) l FR0!! THE STUFFING B0X OF THE UNIT - 1 RECIPROCATING CHARGING PUf1P. ANOTHER RELEASE l

,o,3i ;ON 03-13-81 WAS CAUSED BY LEAKING ISOLATION VALVES OF AN ISOLATED GAS DECAY TANK. l g

m lTHESE RELEASES OCCURRED WITHOUT THE SAf1PLING AND ANALYTICAL REQUIREMENTS OF

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ATTACHED SUPPLEMENT TO AE0 # 81-001/04X-1 PAGE 1 of 2 CAUSEDESCRIPJ10NANDCORRECTIVEACTIONS-27 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 DETER-MINED 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 B0X. THE RECORDER INDICATES THAT R-26 STARTED DECREASING AFTER THE RECIPROCATING CHARGING PUMP WAS REMOVE 0 FROM SERVICE. THE STUFFING B0X OF THE CHARGING PUMP DRAINS TO THE CLEAN SUMP TANK WHICH IS VENTED TO THE AUXILIARY BUILDING VENTILATION SYSTEM.

RELEASE CALCULATIONS RELEASE KNOWN TO BE FRESH GAS,1.041 Ci 0F Xe-133 WAS RELEASED AT A RATE OF 7.23 E-5 Ci PER SECOND. THIS IS .1215% OF THE NOBLE GAS TECHNICAL SPECIFICATION LIMITS. THE MAXIMUM RELEASE RATE WAS DETERMINED TO BE 7.348 E-4 Ci PER SECOND OR 1.235% OF THE N0BLE GAS TECHNICAL SPECIFICATION LIMIT.

THIS EVENT WAS DETERMINED TO BE REPORTABLE ON 03-23-81, F0LLOWING A REVIEW 0F THE INVESTIGATION REPORT AND DISCUSSION WITH THE NRC RESIDENT INSPECTOR.

THE SECOND UNPLAkNED 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 RELEA3ED ON 03-13-81 TO ALLOW FOR THE REPAIR OF THE ISOLATION VALVES, MANUFACTURED BY GRINNEL-DRAWING N0. WREF-3-CS. THE VALVE DIAPHRANS WERE REPLACED AND THE GDT WAS RETURNED TO SERVICE. EXAMINATION OF THE DIAPHRAfG WHICH 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 4.356 E-2 pCi/cc Xe-131M 7.418 E-4 pCi/cc Kr-85 9.235 E-4 pCi/cc I-131 7.710 E-8 pCi/cc FOR A TOTAL 0F 2.405 CURIES AT 1.23 x E-3% OF TECHNICAL SPECI-FICATION LIMITS FOR N0BLE GASES AND 4.10 E-6 CURIES OF I0 DINE E

131 AT 1.85 x E-5% OF TECHNICAL SPECIFICATIONS.

___-_______.-_s

ATTACHED SUPPLEMENT TO AE0 # 81-001/04X-1 PAGE 2 of 2 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS - 27 (CONT.)

THESE RESULTS ARE BASED ON ANALYSIS PERFORf1ED 03-13-81 ON THE REMAINDER OF THE TANK DECAYED BACK TO 02-03-81 WHEN TANK WAS ORIGINALLY ISOLATED. SINCE IT HAD BEEN

" ISOLATED" :T 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 SHOULD BE_ 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.

THIS AEO IS BEING REVISED TO REFLECT RELEASE ACTIVITIES DECAYED BACK TO 02-03-81 AS REQUESTED BY L. HEUTER, NRC - REGION 3. THE ORIGINAL CALCULATIONS WERE BASED ON THE GRAB SAMPLE ANALYZED ON 03-13-81. THIS REVISION ALSO CORRECTS TWO TYP0 GRAPHICAL ERRORS FOR THE IODINE RELEASE. THE ORIGINAL DATA SHOULD HAVE READ, 1.51 x 10-7 CURIES OF 10 DINE -131.

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