ML19199A500
| ML19199A500 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/04/1977 |
| From: | Arnold R Metropolitan Edison Co |
| To: | O'Reilly J NRC Office of Inspection & Enforcement (IE Region I) |
| Shared Package | |
| ML19199A499 | List: |
| References | |
| GQL 446, GQL-0446, NUDOCS 7905030021 | |
| Download: ML19199A500 (2) | |
Text
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n.n ~~~uu METROPOLITAN EDISON CCMPANY suestoiserof asseast rusticuritoriesccaronation POST CFFICE SCX 542 REACING, PENNSYLVANIA 19Ec3 TELEPHCNE tts - 9t9 :501 April h, 1977 GQL Chko Mr. J. ?. O'Reilly, Director U. S. Nuclear Regulatory Co==ission Office of Inspection & Enforce =ent Pegion I 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Sir:
Three Mile Island Nuclear Station Unit 2 (Uf!-2)
License No. C?PR-66 Docket No. 50-320 Reactor Building Air Cooling Units On March 4, 1977, Mr. L. Narrow of your office was verbally notified of a situation which Metropolitan Edison Co=pany considered to be reportable in accordance with the require =ents of 10CFR50.55(e).
'"his letter constitutes the required thirty-day follow-up letter.
Descriotion A field examination of the five Reactor 3uilding Air Cooling Units revealed that unusual force was necessary to manually open (and =aintain in an open position) the inlet da pers (gravity type backdraf t da=pers).
It should be noted that these fan coil unita are installed but not energized. The effect of fan forces in actuating the da:pers has not been tested.
It appears that the inlet da=per counterweights are not properly oriented or adjusted.
Analvsis of Safetr !=clications 21e improper functioning of the da=pers could result in excessive pressure losses internal to the fan coolers.
'"his condition might result in insufficient reactor building e=ergency air cooling which could lead to higher contain=ent pressures and te=peratures following a design basis loss of coolant or stea= line break accident.
However, since these fans are used for nor=al Reactor Building cooling, failure of the da=pers to open would have been readily apparent when the fans nre energi:ed during startup and test phases of construction and subsequently corrected before the plant beca=e operational.
For this reason, we believe that there would have been no adverse effect on the health or safety of the public or plant staff.
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y Mr. J. P. O'Reilly SQL CLLo Corrective Action The proper location and orientation of the inlet da=per counterweight is being discussed with the vendor, A=erican Air Filter Company.
The da:per asse=blies will be adjusted as required xt.
subsequently tested for proper operation.
Corrections will be =ade prior to Ect Functional Testing presently scheduled for June, 1977.
7ery truly yours, lb' R. C. Arnold Vice President cc: Dr. Ernst Volgenau, Director Office of Inspection & Enforce =ent U. S. Nuclear Regulato ry Co==ission Washington, D. C.
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