ML20098F877
| ML20098F877 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 09/04/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| CON-#484-739 155, OL, NUDOCS 8410030489 | |
| Download: ML20098F877 (3) | |
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'84 SEP 10 All :39 Dr. 'Ihmas E. Ihlrley, Director United States Nuclear Regulatory Cm mission Office of Inspection and Enforcement, Region I l :- t 631 Park Avenue c' '
King of Pntssia, PA 19406 SUR7ECT: Significant Deficiency Report #155 Final Report on Inproperly Installed Shaft Key and Icose Setscrews on the Control Rom Dnergency Presh Air Fans Limerick Generating Station, Units 1 and 2 NRC Construction Permits Nos. 106 & 107 File:
QUAL 2-10-2 (SDR #155)
Dear Dr. Murley:
In cmpliance with 10CFR50.55 (e), enclosed is the final report on the subject deficiency.
Sincerely, S @M Copy to: Director of Inspection and Enforcement United States Nuclear Regulatory Ccmnission Washington, DC 20555 S. K. Chaudhary, Resident NRC Inspector (Limerick)
J. Wiggins, Resident NRC Inspector (Linerick)
RBVbls/08278401 Enclosure
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l cct.; Judge Iawrrnc3 Brrnne."
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Judge Petcr A. Morria
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' Judge Richard F.. Cole-(w/ enclosure)
Judge Christine M. Kohl (w/ enclosure) e Judge Gary J. Edles (w/ enclosure)
Judge Reginald L. Gotchy-(w/ enclosure)
Troy B. Conner, Jr., Esq.
(w/ enclosure)
Ann P. Hodgdon, Esq.
(w/ enclosure)
Mr. Frank R. Romano (w/ enclosure)
Mr. Robert L. Anthony (w/ enclosure)
Ms. Maureen Mulligan (w/ enclosure)
Charles W.~ Elliott, Esq.
(w/ enclosure)
Zori G. Ferkin, Esq.
(w/ enclosure)
Mr. Thomas Gerusky-(w/ enclosure)
Director, Penna. Emergency (w/ enclosure)
Management Agency Angus Iove, Esq.
(w/ enclosure)
-David Wersan, Esq.
(w/ enclosure)
Robert J. Sugarman, Esq.'
(w/ enclosure) y' Martha W. Bush, Esq.
(w/ enclosure)
Spence W. Perry, Esq.
(w/ enclosure)
Jay M. Gutierrez, Esq.
(w/ enclosure)
Atomic Safety & Licensing Appeal Board (w/ enclosure)
Atomic Safety & Licensing Board Panel (w/ enclosure)
Docket & Service Section.
- (w/ enclosure - 3 copies))
James Wiggins (w/ enclosure)
Timothy R. S. Campbell (w/ enclosure) b i
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Significant Deficiency Report - SDR No. 155 Inproperly Installed Shaft Key and Loose Setscrews on the Control Room Emergency Fresh Air Fans Limerick Generating Station NRC Construction Permit Nos. 106 and 107 Description of Deficiency During preoperational tests performed in June, 1984 It was found that the "B" Control Room Emergency Fresh Air Fan had an improperly installed shaft key connecting the fan hub to the shaft and the corresponding se.tscrews were not tightened.
Further Investigation showed that the "A" Control Room Emergency Fresh Air Fan had the shaft key Installed properly, however the corresponding setscrews were not tightened.
The cause of this problem was determined to be the result of field rework that was performed on these two fans.
The fans had been disassembled and were not properly reassent>1ed upon completion of work. These fans required dissassent>1y and re-assent >1y to meet specific gas tight requirements; shaft seals were added and Internal and external stitch welding was completely seam welded. No other fans required this rework.
Corrective Action The deficiencies found in both fans were corrected per the manufacturer's instructions.
The fans were then tested under the preoperational test program and found to perform satisfactorily.
Since no other fans required field rework of this nature, none were assent >1ed differently from the manufacturers Instructions',
thereby precluding a repetition of this problem.
Safety Inpilcations The Control Room Emergency Fresh Air Fans are required to ensure Control Rocm habitability during an accidental radiological release.
They provide a filtered (HEPA-Charcoal-HEPA) outside air supply to enable maintaining the Control Room at a positive pressure in relation to the surrounding area.
A failure of both these fans could have resulted in the inability of maintaining Control Room habitability during an accidental radiological release.
RBA/bls/08278403
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