ML20099M175

Revised Final Deficiency Rept,Item 101 Re Debris in Piping Sys.Initially Reported on 850114.Items Removed & Safety Analysis Performed

ML20099M175
Person / Time
Site:	Fermi
Issue date:	03/06/1985
From:	Jens W DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
101, EF2-70447, NUDOCS 8503210253
Download: ML20099M175 (3)

Text

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8 cayne H. Jen3 Vc3 Pra&nt Nuciear Operatons

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Edison =0 North= ' ' " *Dix

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March e, 1985 EF2-70447 Mr. James G. Keppler Regional Administrator Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Reference:

(1) Fermi 2 NRC Docket No. 50-341 (2) Letter, W. H. Jens to J. G. Keppler, August 27, 1984, EF2-69279 (3) Letter, W. H. Jens to J. G. Keppler, February 7, 1985, EF2-70383

Subject:

Revised Report of 10CFR50.55(e) Item 101

" Debris in Piping Systems" This letter revises Reference 3, Detroit Edison's report of 10CFR50.55(e) Item 101, " Debris in Piping Systems." Changes to Reference 3 are identified by a revision bar in the right hand margin.

On January 14, 1985, Detroit Edison's Mr. J. E. Conen telephoned Mr. R. C. Knop of NRC Region III and informed him of the discovery of debris in the instrument volume of the south scram discharge header. This letter documents that l Detroit Edison has taken corrective action in accordance with commitments in Reference 2, Final Report of 10CFR50.55(e) Item 101, " Debris in Piping Systems."

Description of Deficienc_E During leak rate testing of the scram discharge system, the downstream isolation valve for the instrument volume drain l line leaked past the seat. When the valve was opened for repairs, a flashlight switch was found lodged in the valve seat. The Deviation / Event Report written to investigate this discrepancy included the requirement to radiograph the 8503210253 850306 gDR ADOCK 0500034I PDR MAR 11 EB5

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EF2-704472 '

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bottoms of thennorth and south scram discharge instrument volumes.. A flashlight and pneumatic. grinder were discovered in the-south: instrument volume.

s

. Detroit Edison.has concluded that-the flashlight and grinder

'iwere left in the. scram discharge system piping during construction. The 8 inch scram discharge headers which dump into the. instrument volumes were hydro-lased as part.of the CRD-system flushing program. The scram discharge piping

- : configuration is such that a velocity flush of'the

. instrument' volume-is not possible as the.12 inch diameter-instrument! volume is drained by a 2 inch drain line. ,

Hydro-lasing the U inch scram discharge header would have i- pushed debris into the; instrument volume'where, depending on its size,.it would remain and/or be removed when the

. instrument volume is drained.

Analysis of Safety. Implications Debris remaining in safety.related piping systems could result in the affected system not performing its intended

.. function. The safety analysis performed for the items found in the SDV. Instrument volume' concluded that there was no potential for-degradation of the function of the Control Rod

. Drive System. However, deterioration'of the flashlight.or

, grinder.could result in parts becoming lodged in one or both of the drain isolation valves causing degradation of their primary (containment isolation function. In addition, reorientation of the: flashlight or grinder could have caused partial blockage of the drain line resulting in a reactor scram on high water level in the instrument volume.

Corrective Action ,

,.s a result.of finding the flashlight parts in the drain e

valve the following actions were taken:

o The bottom sections of both instrument volumes Were

.radiographed to determine if there was debris in either instrument volume. ~This resulted in finding a flashlight and grinder in the south instrument volume.-

Both items have been removed, o The inside of the 8 inch scram discharge header piping was inspected using a TV camera. The piping was clean and'there was no debris in the pipe.

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- Mr. James G. Keppler March 6, 1985 EF2-70447 Page 3 o The 2 inch drain piping was radiographed at points of restriction (elbows) and no debris;was found.

o Detroit Edison has performed a safety analysis of this deviation. The safety analysis is_ included as an attachment to DER NP84-138 and is available for inspection at the Fermi' 2 site.

If you have questions concerning this matter, please contact Mr. Lewis Bregni, (313) 586-5083.

, Sincerely, (G

cca P. M.. Byron .

fgg R. . C . DeYoung ~

R. C.. Knop USNRC, Document Control Desk Washington, D. C. 20555 e

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