ML18030A352

Discusses long-term Operability of Deep Draft Pumps,In Response to NRC .Original Installation of Pumps Is Adequate.Pump & Valve Inservice Insp Program Requirements for Vibration Surveillances Are Satisfactory

ML18030A352
Person / Time
Site:	Susquehanna
Issue date:	10/14/1981
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Tedesco R Office of Nuclear Reactor Regulation
References
PLA-944, NUDOCS 8110160462
Download: ML18030A352 (4)

Text

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Pennsylvania Power 8 Light Company Two North Ninth Street

~ Allentown, PA 18101

~ 215/ 770.5151 Norman W. Curtis Vice President-Engineering

& Construction-Nuclear 21 5/ 770-5381 October 14, 1981 Mr. Robert L. Tedesco Assistant Director for Licensing Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Docket Nos.

50-387 50-388 SUSQUEHANNA STEAM ELECTRIC STATION LONG TERM OPERABILITY OF DEEP DRAFT PUMPS ER 100450 FILE 841-2 PLA-944

Dear Mr. Tedesco:

In response to the August 13, 1981 letter on the Long Term Operability of Deep Draft Pumps which divided the recommended actions into installation instructions and testing procedures, Pennsylvania Power and Light Company has reviewed the concerns raised and has reached the following conclusions.

The original installation of the deep draft pumps on site is deemed adequate.

The procedures used for the installation are available onsite for IE Inspector review.

These procedures ensured installation was within the manufacturers.

tolerances.

Further, these pumps have operated without incident, as described later in this letter.

Pump removal and reinstallation for the sole purpose of verifying proper installation is unnecessary.

Deep draft pump assembly and disassembly maintenance procedures will be revised to include steps similar

'to the recommended guidelines stated in the subject letter.

However, optical alignment to assure maximum straightness and concentricity of the assembly is unnecessary.

Dial indication alignment checks will be performed.

Additionally, the pump-tomotor flange parallelism and shaft perpendicularity checks will be included.

Construction of the sumps for the deep draft pumps has also been completed.

Pump testing has been performed to verify the absence of fluid anomalies, such as vortexing'r turbulance, in the suppression pool near, the Residual Heat Removal Pump intakes and the Core Spray Pump intakes.

, The three phase testing program proposed to ensure pump operability and to determine bearing wear trends is considered unadvisable at this time.

This posture is based on the pumps having previously experienced a considerable

//Q number of operating hours without difficulty. Further, the potential problems SiiOih0462 SiiOi4 PDR ADGCK 05000387 PDR

Mr. Robert L. Tedesco Page 2'ctober 14, 1981 PLa-944 associated with repeated disassembly/reassembly outweigh the beneficial effects of such checks.

PP&L considers the Pump and Valve Inservice Inspection Program requirements for vibration surveillances using contact probes satisfactory for trend determination.

This data will be taken monthly and observance of abnormal vibration or wear will initiate consideration of testing similar to that described in the subject letter.

N. W. Curtis Vice President-Engineering 6 Construction-Nuclear CTC/mks