IR 05000498/1987051

Insp Repts 50-498/87-51 & 50-499/87-51 on 870803-07.No Violations or Deviations Noted.Major Areas Inspected:Standby Diesel Generator Design,Operation & Maint to Ensure Generators Will Be Available When Needed

ML20235T409
Person / Time
Site:	South Texas
Issue date:	08/27/1987
From:	Hunnicutt D, Vickrey R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:
Shared Package
ML20235T362	List: IR 05000498/1987051 ML20235T359
References
50-498-87-51, 50-499-87-51, NUDOCS 8710130078
Download: ML20235T409 (3)

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APPENDIX U.S. NUCLEAR REGULATORY COMMISSION

REGION IV

NRC Inspection Report:

50-498/87-51 Construction Permits:

CPPR-128 50-499/87-51 CPPR-129 Dockets:

50-498 50-499 Licensee:

Houston Lighting & Power Company (HL&P)

P. O. Box 1700 Houston, Texas 77001 Facility Name:

South Texas Project Electric Generating Station (STP),

Units 1 and 2 Inspection At:

STP Site, Matagorda County, Texas Inspection Conducted:

August 3-7, 1987 i

l Inspector:

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[/27/8 7

. B. Vickrey, Reactprffnspector, Operations D' ate Section, Reactor Safety Branch i

l Approved:

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FMt7/87 D. M. Hunnicutt, Chief, Operations Section Date '

l Reactor Safety Branch Inspection Summary Insoection Conducted August 3-7, 1987 (Report 50-498/87-51; 50-499/87-51)

l Areas Inspected:

Routine, unannounced inspection of the standby diesel generator design, operation, and maintenance to ensure they will be available when needed.

The inspection included a look at recent failures to evaluate the i

response to these failures for proper failure analyses, corrective action, i

notification of vendor, and documentation.

Results:

Within the area inspected, no violations or deviations were Identified.

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i 8710130078 871005 PDR ADOCK 05000498 i

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I DETAILS

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1.

Persons Contacted HL&P and Contractors B. Humble, Supervisor, NSSS M. Burg, Lead Mechanical Engineer

• S. Head, Lead Engineer, Licensing NRC D. Carpenter, Senior Resident Inspector, Operations E. Tomlinson, NRR T. Reis, Resident Inspector, Operations

• Denotes attendance at the exit interview on August 7, 1987.

j The NRC inspector also interview 13d several other licensee and contractor employees, including diesel generator operators.

2.

Standby Diesel Generator (DG) Review a.

Inspector Observations The NRC inspector made several inspections in the diesel generator-(DG) rooms to observe conditions and operators.

Review of the logs and operator watchstanding was favorabla during the 100-hour run of DG No. 13.

The NRC inspector was concerned that the frequency between cleanup of oil leaks on DG No. 12 may not have been adequate for the amount of leakage at the-time.

I The NRC inspector brought to the attention of the licensee that a bolt was missing on the second flange downstream of the. crankcase exhaust vent line on DG No. 12.

This is an unresolved item (498/8751-01) pending further review by the NRC inspector during a subsequent inspection.

b.

Review of Recent Failures

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The NRC inspector reviewed the standby DG failures since June 22, 1987, to evaluate the response to these failures for proper failure analyses, corrective action, notification of vendor, and documenta-tion. These failures included:

failure of the power. supply for the speed monitor, failure of the voltage regulator power diodes, I

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diesel generator No.12 failed to start,

high ambient temperature alarm inside high voltage cabinet (diesel generator No. 13)

cracked fuel injector assembly nut (diesel generator No.13), and failure of lube oil. hose connection to a main crankshaft bearing.

c.

Conclusions and Recommendations The NRC inspector determined that'the licensee's corrective actions were satisfactory.

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The NRC will follow'up on the root cause of the cracked fuel l

injector assembly nut identified as a 10 CFR 50.55(e) item in ST-HL-AE-2331.

The licensee should continue.their investigation'of replacing'20 micron fuel oil filters with 5-micron filters or to add a 5 micron filter downstream of the 20 micron filters.

No violations or deviations were identified.

3.

Exit Interview An exit interview was held on August 7, 1987, with personnel. denoted in paragraph 1 of this report.

At the meeting, the scope of the inspection and findings were summarized.

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