ML19261F299

Environ Incident 50-289/74-11:on 740928 Failure to Monitor Release of Iodine from Auxiliary & Fuel Handling Bldg.Caused by Removal from Svc of Iodine Radiation Monitor Channel W/O Informing Supervisor.Personnel Counseled.Procedure Checked

ML19261F299
Person / Time
Site:	Three Mile Island
Issue date:	10/04/1974
From:	Arnold R METROPOLITAN EDISON CO.
To:
References
GQL-0381, GQL-381, NUDOCS 7910250762
Download: ML19261F299 (4)

Text

- AEC DISTRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPOR ARY FORM)

CONTROL NO: 10e27 FILE.

FROM: Metropolitan Edison Co. DATE OF DOC DATE REC'D LTR TWX RPT OTHER Reading, Pennsylvania 10-4-74 10-11-74 xxxx

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l-signed SENT LOCAL PDR "'"^'

CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

n .' > ^ x.s 1 50-289 DESCRIPTION: ENCLOSURES:

Ltr Reportin; Abnormal Environmental Occurrence #74-11 on 9-28-7.+ concerning Failure to Monitor the release of iodine M. Qgr 77'% c-J

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,,m from Auxiliary and Fuel Handling Building..,

DO NOT REMOVE PLANT NAMEthree Mile Island Station #1 FOR ACTION /lNFORMATION 10-19-74 JGB BUTLER (L) SCHWENCER (L) ZIEMANN (L) REGAN (E)

W' Copies W/ Copies W/ Copies W/$opies CLARK (L) STO LZ (L) DICKER (E) LEAR (L)

W/ Copies W/ Copies W/ Copies W/ Copies PARR (L) VASSALLO (L) KNIGHTON (E)

W/ Copies W/ Copies W/ Copies W/ Copies KNIEL (L) PURPLE (L) YOUNGBLOOD (E)

W/ Copies W/ Copies W/ Copies W/ Copies INT,ERNAL DISTRIBUTION EmC TECH REVIEW /6ENTON LIC ASST A/T IN D 4EC POR / GRIMES B R AlTM AN Of C, ROOM P-506A wSCHROEDER GAMMILL DIGGS (L) SA LTZM AN AlUNTZING/ STAFF MACCARY l$ASTNER GEARIN (L) 8. HURT CASE KNIGHT v$ALLARD GOULBOURNE (L)

GIAMBUSSO PAWLICKl SPANG LE R KREUTZER (E) PLANS BOYD SHAO LEE (L) MCDONALD MOORE (L) (BWR) STELLO FJVI RO MAIG R ET (L) CHAPMAN DEYOUNG (L) (PWR) HOUSTON A1ULLER /EED (E) SL. DU BE w/ input SJOVHOLT (L) NOVAK DICKER SERVICE (L) E. COUPE

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EXTERNAL DISTRIBUTION (4' LOCAL PDR Harrisbur ,Pa TIC (ABERNATHY) 1)(2)(10) - N ATIONAL LABS AN 6 L 1 - PDR SAN /LA/NY 1 - NSIC (BUCHANAN) 1 - ASLBP(E/W Bldg, Rm 529) 1 - BROOKHAVEN NAT LAB 1 - ASLB 1 - W. PENNINGTON, Rm E 201 GT 1 - G. ULRIKSON, ORN L 1 - Newton Anderson 1 - B&M SWINEBROAD, Rm E 201 GT 1 - AGMED (RUTH GUSSMAN) 16 - ACRS HOLDING 1 - CONSU LTANTS Rm B-127 GT N EWM ARK /B LUME/AG BABI AN 1 - R. D. MUELLER, Rm E-201 GT

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Mr. J. P. O'Reilly, Director ,

Regulatcry Cperations - Regien 1 - _

U.S. Atcmic Energy Cc= mission - .4 631 Park Avenue '

King of Prussia, PA 19hC6

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Dear Mr. O'Reilly:

Operating License EPR-50 Docket No. 50-289 In accordance with the Enviren= ental Technical Specifications for cur Three Mile Island Nuclear Station, Unit 1, we are reporting the following Enviren= ental Incident: ,77i; h '

(1) Reporting Nu=ber: E.I. 50-289/7h-11 /yV W^N/ 4

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(2a) Report Date: Cetober h, 137h Lf.- ,

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(2b) Occurrence Date: September 28, 197h - - - OCT 1819t4 " r.

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(3) Facility: Three Mile Island Nuclear Statien, Unit 1 s

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(h) Identificaticn of Incident:

Failure to monitor the release of icdine frcm the Auxiliary and Fuel Handling Building due to the removal frc= service of the icdine channel of Radiaticn Mcnitor A-8, which is a violation of the monitoring requirenents of the Enviren= ental Technical Specificaticns, paragraph 2.3.2.A.2.

(5) Conditiens Prior to Cecurrence:

The reacter was at steady state pcuer with major plant parameters as follevs:

Power: Co~ - ' OC",

Elec.: 855 lG (Gross) }khk 1082:

6 RC Flow: 139 x 10 lb/hr RC Pressure: 2163 psig RC Temp.: 579cy PRZE level: 2h3 in PEZ3 Temp.: 6L7 F (6) Description of Incident:

At 2130 hcurs on Septe=ber 28, 197k, the iodine channel cf Radiatica Monitor A8 was re=oved frc= service fer calibration while a release was being =ade frc= a vaste gas tank. The release was ccepleted before the channel was returned to service.

(7) Designation of Apparent Cause of Incident:

It is believed that the incident in question was caused primarily by the fallare cf Plant Maintenance eersennel to follow approved procedures, in that they re=oved a radiation monitor channel frc=

service withcut first infor=ing the Shift Superviscr.

(8) Analysis of Incident:

It is believed that the failure to =cnitor the iodine release rate did not cause any environ = ental damage and did not represent a threat to either the health or safety of the public, in that the contents of the vaste gas tank were analy.:ed prior to their release, no iodine activity was detected, and the release rate did not exceed the Technical Specification limits.

(9) Corrective Action:

The folleving short-ter: corrective acticns were taken:

a. The importance cf following all applicable precedures was impressed upon the Instrument Fore =an and instrument technicians.

b. A Superintendent's Operating Memn Las sent to all apprcpriate plant perscnnel directing thea to infor= the appropriate foreman of any propcsed action on a safety related syste= requested by a vendor representative and to inform the Shift Supervisor of any preposed work to be done on a safety related system.

At a meeting held t=nediately after the incident was repcrted, the Plant Operations Eeview Cc==ittee (PCEC) reviewed and gave its approval of these acticns. In addition, they recc== ended to the Station Superintendent that the folleving 1cne-ter= ccrrective actions be taken:

a. Review the procedure which controls the removal of radiation

=cnitors frc= service and add any furthe. cautions which =ay be required.

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b. Investigate the feasibility of adding key-lcek switches to the defeat circuit for the radiation scnitor interlocks.

The Station Superintendent concurred with these recc= endations and has taken the necessary steps to incure their implementation.

(10) Failure Data:

Not applicable.

Sincerely, I-l

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h. C. Arnold Vice President RCA/JFV/cas File: 20.1.1/7.7.3.11.1 cc: Director Directorate of Licensing U.S. Atomic Energy Ccnmission Washington, D.C. 205h5 e

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