ML20063L436

Interim Deficiency Rept Re Pressure Sensing Line in Starting Air Sys for Emergency Standby Diesel engine-generator Sets. Initially Reported on 820419.Restrictive Orifice Will Be Installed.Final Rept Will Be Submitted by 830415

ML20063L436
Person / Time
Site:	Harris
Issue date:	09/01/1982
From:	Chiangi N CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, CQAD-82-1493, NUDOCS 8209090104
Download: ML20063L436 (4)

Text

.- . l wp&L Carolina Power & Light Company September 1, 1982 File: SH N-2/18 CQAD 82-1493 Item 80 Mr. James P. O'Reilly United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest Atlanta, Georgia 30303 SHEARON HARRIS NUCLEAR POWER PLANT m DOCKET NO. 50-400 N- b PRESSURE SENSING LINE IN THE C' rN_

STARTING AIR SYSTEM FOR EMERGENCY u F ;" .

STANDBY DIESEL ENGINE-GENERATOR SETS y 2

Dear Mr. O'Reilly:

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35 t r. O Attached is the second interim report on the subject item which was" deemed E U reportable per the provisions of 10CFR50.55(e) on April 19, 1982. Ca&L is 2 l' pursuing this matter, and it is currently projected that corrective Etion jad submission of the final report will be accomplished by April 15, 1983.

Thank you for your consideration in this matter. .

Yours very truly, N. J C iangi - Manager Engineering & Construction Quality Assurance / Quality Control NJC/mt Attachment cc: Mr. G. Maxwell W/A Mr. V. Stello (2) W/A OFFICl AT.CDPj).,

- ,x c.. %6 *Y A5' c- -*+evdle Street

• P. O Box 1551

• Raleigh, N C 27602 8209090104 820901 myyranvy;;gmg=nm; g PDR ADOCK 05000400 s PDR

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CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 Interim Report August 30, 1982 Reportable Under 10CFR50.55(e)

Pressure Sensing Line in the Starting Air System for Emergency Standby Diesel Engine-Generator Sets 4

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SUBJECT:

,y Shearon Harris Nuclear Power Plant Unit No. 1

- 10CFR50.55(e) reportable deficiency concerning a potential f problem with the pressure sensing lines in the starting air 1

systems for the Emergency Standby Diesel Engine-Generator i Sets supplied by Transamerica DeLaval, Inc., under Purchase Order NY-435079.

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ITEM:

The pressure sensing line between the starting air storage tank manual isolation valve and pressure switch mounted on the starting air compressor for the Transamerica DeLaval, Inc., Standby Diesel Engine-Generators Model No. DSRV-16-4.

SUPPLIED BY:

The manual isolation valves, compressors, and air tanks are

supplied by Transamerica DeLaval, Inc., Oakland, California. The sensing line is furnished and installed by CP&L in accordance with the design documents generated by Ebasco Services, Inc.

k hATURE OF

] DEFICIENCY:

In a letter dated March 24, 1982, Tranamerica DeLaval notified CP&L that in the event of a pressure sensing line failure during a seismic event, the starting air pressure could bleed down to 150 psig in a minimum of six minutes.

The engine will not automatically start when the starting air pressure is less than 150 psig.

DATE PROBLEM OCCURRED:

Refer to section above.

DATE PROBLEM REPORTED:

April 19, 1982 - CP&L (N. J. Chiangi) notified the NRC (Region II - C. Julian) that this item was reportable under 10CFR50.55(e). Transamerica DeLaval reported this to the NRC under 10CFR Part 21 on March 19, 1982.

SCOPE OF PROBLEM:

The potential problem affects the four pressure sensing lines (two per diesel engine).

SAFETY j IMPLICATION:

The Emergency Standby Diesel Engine-Generator Sets supply power to the emergency safety feature buses in the case of a loss of normal on-site and off-site power sources. Failure of the pressure sensing line could affect engine availability.

REASON l DEFICIENCY IS REPORTABLE

If lef t uncorrected, the diesel engines might not start during a pressure sensing line failure and emergency on-site A.C. power would not be available.

CORRECTIVE ACTION: Transamerica DeLaval recommends the installation of a 1/8" restrictive orifice between the manual isolation valve and the starting air tank, which would increase the time to reach 150 psig to 53 minutes if the sensing line failed. This orifice will be installed during installation of the diesel-generator.

FINAL REPORT: A final report will be issued once the corrective action described above has been completed. It is currently projected that the submittal date will be April 15, 1983.

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