05000289/LER-1982-001, Updated LER 82-001/01T-2:on 820225,during Control Room Habitability Review of NUREG-0737,Item III.D.3.4,potential Discovered for Contaminated Air to Enter Area Served by Control Bldg Ventilation Sys.Flange Installed

Updated LER 82-001/01T-2:on 820225,during Control Room Habitability Review of NUREG-0737,Item III.D.3.4,potential Discovered for Contaminated Air to Enter Area Served by Control Bldg Ventilation Sys.Flange Installed

ML20078A657
Person / Time
Site:	Three Mile Island
Issue date:	09/07/1983
From:	Hukill H, Stephenson C GENERAL PUBLIC UTILITIES CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-3.D.3.4, TASK-TM 5211-83-168, LER-82-001-01T, LER-82-1-1T, NUDOCS 8309230361
Download: ML20078A657 (4)

LER-2082-001, Updated LER 82-001/01T-2:on 820225,during Control Room Habitability Review of NUREG-0737,Item III.D.3.4,potential Discovered for Contaminated Air to Enter Area Served by Control Bldg Ventilation Sys.Flange Installed

Event date:
Report date:
2892082001R00 - NRC Website

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EVENT DESCRIPTION AND PROS A8LE CONSEQUENCES h 1 o 121 l During ordered shutdown and while evaluatine contrn1 rnn- habitabilftv review off f7TTl i NUREG 0737 Item III.D'.3.4 an item reportable per T.S. 6.9.2.A(9) was identified. 1 i

4 lo 64 i l Computer room air conditioning unit duct work penetrates the wall to the fuel Iei5i L handling buildine. There is no radiation signal interlock to shutdown the unit.. I l o is j l There nnnenrm to be a notential for this to allow contaminated air to enter an ared ga;y; ; served by the control building ventilation system.

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,,,o,l Blind flange is installed on make-up duct to minimize the effect of an airborne Long term  ;

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g ; corrective action will be to implement administrative controls to close fire g Idampers FD-48 and 49 on seismic event alarm in the control room..

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ATTACHMENT I LICENSEE EVENT REPORT NARRATIVE REPORT TMI-1 LER 82-001 I. CURRENT ACTIVITIES AT THE TIME OF THE OCCURRENCE TMI Unit 1 was in a long term cold shutdown. Engineering was performing a design review on the Control Building Ventilation System.

II. LEADING CIRCUMSTANCES A preliminary safety concern which dealt with the potential of breaching an environmental barrier at the time of installation of an air conditioning unit to service the Control Building computer room has been evaluated.

The concern identified the possibility of introducing make-up air from the Auxiliary and Fuel Handling buildings, a potentially contaminated area (post accident), into the Control Building Ventilation System which serves the Control Room. The concern further identified the installation as having been made with no provision for automatic isolation on high airborne radioactivity to exclude che potencial contaminants from the Control Build-ing Ventilation System.

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III. DESCRIPTION In November 1975, criteria was developed for the installation of a " closed-loop" air conditioning unit to support the Modular Computer System in the Control Building. In early 1976, the installation was completed. During the 1979 Refueling' Outage the ductwork for this air conditioning system was modified with the installation of seismically qualified UL listed 3-hour rated fire dampers (FD-48 and FD-49) to isolate the Control Building side (computer room) from the Fuel Handling side where the air conditioner (AH-E-108) is mounted. The fire dampers trip closed and the air conditioner shuts down when a fire detection system actuated and not on high airborne radioactivity in the area. The fire detection system was installed in conjunction with a Halon 1301 fire suppression system for the computer room sub-floor area.

Although the fire dampers are seismically designed, the adjacent suction and discharge duct work are not. The concern is tnat if a seismic event were to suf ficiently damage this ductwork, in conjunction with a high airborne radioactivity condition in the fuel and auxiliary building ventilation system; the control room ventilation system could potentially become contaminated.

Also, should the air conditioning system make-up line let contaminated air into the mod comp room, it could potentially contaminate the control build-ing ventilation system.

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None V. PREVIOUS EVENTS OF A SIMILAR NATURE None VI. ROOT CAUSE Recen:~ design _ reviews have deter =ined tha: he " closed-loop" air conditioning syster was not built or designed in accc: dance with the standard review plan (SRP) and, therefore, :he syster does not mee:

the requirements of- NUPIG 0737 See:1on III.D.3.4 The application of the criteria contained in the SRP has resulted in a "new lock" at the purpose of the control roo: ventilarien envelope and has resulted in a reconsideration of the air conditiening system.

VII. I.WIDICE CORRECTIVE ACTION The installation of a- block off plate on the take-up air due: work -

has mini = iced the possibility of the introdue:io: cf centa=inated take-up air into the Control Building Envelope in the event of a radiation accident.

VIII. LONG TERM CORRECTIVE ACTION The procedure:for responding to a seistic even: has been codified c recuire that :ihe Control Building cc puter roc = air tendi:icner be i turned off and .he seistic fire da=pers FD-45 and FD-49 be manually l closed. This procedure is iniziated based en seis=ic even alarns in 1

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GPU Nuclear Corporation L Nuclear =fme Bs48 S Middletown, Pennsylvania 17057 717 944 7621 TELEX 84-2386 Writer's Direct Dial Number:

September 7, 1983 5211-83-168 Dr. Thomas E. Murley Region I, Regional Administrator U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Sir:

Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating License No. DPR-50 Docket No. 50-289 LER 82-01/0lT-2 Attached please find Update Licensee Event Report 82-01/0lT-2 which is a follow-up report concerning control building ventilation discrepancies.

This event was prompt reported per Technical Specifications 6.9.2. A(9) on February 25, 1982. The follow-up report was submitted March 17, 1982 (5211-83-070). This revision is simply corrections to Rev. 1 of the subject LER.

Sincerely, Pp L eek H. Hukill Director, TMI-l HDH:CJS:vj f Enclosures cc: R. Conte NRC Office of Management Information & Program Control 6

GPU Nuclear Corporation is a subsidiary of the General Pubhc Utilities Corporation