ML20012F501

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Forwards Corrections to 891016 Response to Emergency Diesel Generator Engine Requirements.Lengths of Two Pairs of Bolts Above Crankpin Shall Be Measured Ultrasonically Before Detensioning & Disassembly of Bolts
ML20012F501
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 04/03/1990
From: William Cahill, Walker R
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TXX-90134, NUDOCS 9004160029
Download: ML20012F501 (2)


Text

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MM Log # TXX 90134

-- 4 File # 10010 2 2 909.5

'#* ' IO '"$U'I dELECbC April 3, 1990

?$",#$,Y'.$r2 U. S. Nuclear Regulatory Commission Attn Document Control Desk Washington, D. C. 20655 SU6 JECT: COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET N05. 50 445 AND 50 446 EMERG,ENCY DIESEL GENERATOR ENGINE REQUIREMENTS REF: 1) NRC letter from C. 1. Grimes to W. J. Cahill Jr.,

dated September 18, 1989.

2) TV Electric letter. legged Txx+89755. from W. J. Cahill. Jr. to NRC. dated October 16, 1989.

Gentlemen:

Reference 1 identifies a number of issues regarding the Emergency Diesel Generator requirements. TV Electric provided a response to the Diesel Generator issues in TXX 89755 (Reference 2). Based on the review of NUREG 0797. Supplement 22. Appendix 1. and recent discussions with the representatives of the NRC staff. the following corrections are made to the response provided in TXX 69755.

1) Attachment 1. item (2). Connectino Rods. 3rd Bu'let (Pace 1 of 3)

TXX 8975E ResDonser o The lengths of the two pairs of bolts above the crankpin shall be measured ultrasonically before detensioning and disassembly of the bolts. If bolt tension is less than of the value at installation, the cause shall be determined. appropriate corrective action shall be taken, and the interval between checks of bolt tension shall be reevaluated.

Revised Responset o The lengths of the two pairs of bolts above the crantpin shall be measured ultrasonically before detensioning and disassembly of the bol t s . If bolt tension is less than 93 percent of the value at installation, the cause shall be determined, appropriate corrective action shall be taken, and the interval between checks of bolt tension shall be reevaluated.

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o TXX 90134 April 3, 1990 Page 2 of 2

2) Attachment 1. iten (4). Cylinder Heads. Last tullet. (Pace 3 of 3)

TXX 89755 Resnonset o All cylinder heads are Group !!! heads (i.e., cast after September, 1980). Group !!! heads continue to demonstrate favorable leakage performance. This will be confirmed with T0! before air roll tests are discontinued.

Revised Retoonset o All cylinder heads are Group !!! heads (i.e., cast after September, 1980). Group !!! heads continue to demonstrate leak free performance.

This will be confirmed with TDI before air roll tests are discontinued.

Sincerely, k b.,71[' C-William J. Cahill, Jr.

h1 By - b ' 1 RogerD. Walker Manager of Nuclear Licensing MCP/vid c Mr. R. D. Martin, Region IV Resident inspectors, CPSES (3)

J. H. Wilson, NRR OSP

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