ML20098E858
| ML20098E858 | |
| 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 | |
| QUAL-2-10-2, SDR-155, NUDOCS 8410020035 | |
| Download: ML20098E858 (2) | |
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PHILADEl.PHIA ELECTRIC COMPANY 2301 MARKET STREET
. P.O. BOX 8699 SEP 041984 PHILADELPHIA. PA.19101 JOHNS.KEMPER vic E-PR EsiD E NT ENGINEERtNG AND RESE ARCH I*
&0 Dr. Thmas E. Murley, Director i
United States Nuclear Regulatory Cm mission Office of Inspection and Enforcment, Region I 631 Park Avenue King of Prussia, PA 19406 l
SUBJECP: Significant Deficiency Report #155 Final Report on Inproperly Installed l
Shaft Key and Icose Setscrews on the Control Rom Dnergency Fresh Air Fans Limerick Generating Station, Units 1 and 2 NRC Construction Permits Nos. 106 & 107 File:
QUAL 2-10-2 (SDR #155)
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Dear Dr. Murley:
l In cmpliance with 10CFR50.55 (e), enclosed is the final report l
on the subject deficiency.
l Sincerely, I
lASNf l
l Copy to: Director of Inspection and Enforcement United States Nuclear Regulatory Cm mission Washington, DC 20555 S. K. Chaudhary, Resident NRC Inspector (Limerick)
J. Wiggins, Resident NRC Inspector (Limerick)
RBA/bls/08278401 Enclosure l
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S
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Significant Deficiency Report - SDR No. 155 Improperly Installed Shaft Key and Loose Setscrews on the Control Room Emergency Fresh Air Fans Limerick Generating Station NRC Construction Permit Nos. 106 and 107 f
Description of Deficiency During preoperational tests performed in June, 1984 it was found that the "B" Control Room Emergency Fresh Air Fan had an
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improperly installed shaft ke" connecting the fan hub to the shaft and the corresponding setscrews were not tightened.
Further investigation showed that the "A" Control Rocm 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 fleid rework that was performed on these two fans.
The fans had been disassentled and were not properly reassentled upon completion of wnrk. These fans required dissassenbly and re-assently to meet specific gas tight requirements; shaft seals were added and !nternal 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 fleid rework of this nature, none were assentled differently from the manufacturers instructions, thereby precluding a repetition of this problem.
Safety Inp11 cations The Control Rocm Emergency Fresh Air Fans are required to ensure Control Roarn 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 j
pressure in relation to the surrounding area.
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A failure of both these fans could have resulted in the inability of maintaining Control Room habitability during an accidental l
radiological release.
RBA/bls/08278403 s
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