TXX-4428, Deficiency Rept SDAR-166 Re Engine Control Panel Air Filter Bowl That May Be Underrated for Pressure Under Normal Operation.Existing Polycarbonate Bowls Will Be Replaced W/ Metal Bowls to Assure Proper Pressure

Deficiency Rept SDAR-166 Re Engine Control Panel Air Filter Bowl That May Be Underrated for Pressure Under Normal Operation.Existing Polycarbonate Bowls Will Be Replaced W/ Metal Bowls to Assure Proper Pressure

ML20108C892
Person / Time
Site:	Comanche Peak
Issue date:	02/26/1985
From:	Clements B TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Hunter D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
CP-85-05, CP-85-5, SDAR-166, TXX-4428, NUDOCS 8503080171
Download: ML20108C892 (2)

Text

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1 TEXAS UTILITIES GENERATING COMPANY MMYWAY TOW EN . 400 NORTH tlLIVE MTH EET. L.B. Mt . DA LLAh. TEXAM 7 5208

m. f.'.';i! "J1""1. Februa, T ' a"!

TXX-44; $ } QQ h FEB28125 Mr. D.R. Hunter, Chief '

I Reactor Project Branch 2 '

U.S. Nuclear Regulatory Commission Office of Inspection & Enforcement 611 Ryan Plaza Drive, Suite 1000 Docket Nos.: 50-445 Arlington, TX 76012 50-446 COMANCHE PEAK STEAM ELECTRIC STATION DG ENGINE CONTROL PANEL AIR FILTER B0WLS QA FILE: CP-85-05, SDAR-166 FILE NO.: 10110

Dear Mr. Hunter:

In accordance with 10CFR50.55(e), we are submitting the enclosed report of actions taken to correct a deficiency regarding the bowl for the air filter in the engine control panel that may be underrated for the pressure seen by the filter under normal operation.

Supporting documentation is available at the CPSES site for your Inspector's -

review.

Very truly yours, l w BRC:tig cc: NRC Region IV - (0 + 1 copy)

Director, Inspection & Enforcement (15 copies)

U.S. Nuclear Regulatory Commission Washington, DC 20555 05030eog g5gggg45 s

QM PM L -M

' I A URVINDON t19* TKKAN t'T8 Litten ELACTNtr COMi*ANY

. TXX-4428 Page 2 ATTACHMENT DG ENGINE CONTROL PANEL AIR FILTER B0WLS Description The supplier of the diesel generators for CPSES, Delaval, has advised us of a concern identified at another nuclear facility dealing with the air filter bowl in the engine control panel. Original supplier purchase specifications for the air filter bowl required a polycarbonate transparent bowl rated at 250 psig.

Subsequently, the specification was revised to specify a metal bowl and revised ratings were issued for both the polycarbonate and metal bowls. The current rating of the polycarbonate bowl (150 psig at 1250F) is not acceptable.

Review by jobsite pesonnel has confirmed the concern is applicable to CPSES.

Considering the installation of the polycarbonate bowls, failure could occur before starting and during engine operation due to the loss of air pneumatic controls.

Safety Implications In the event the defect had remained undetected, operability of the diesel generators could not be assured. .

Corrective Action The existing polycarbonate bowls will be replaced with metal bowls in order to assure proper pressure rating of the engine control panel air filter system.

Procurement activities for the replacement parts have been initiated.

Installation activites will be monitored by the master data base items issued for the replacement of the defective items.

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