ML20134E676

Submits Relief Request from Testing Requirements Stated in Asme/Ansi OMa-1988(Part 6),paragraph 5.2,for LaSalle County Station,Units 1 & 2,ECCS Water Leg Pumps

ML20134E676
Person / Time
Site:	LaSalle
Issue date:	10/24/1996
From:	Subalusky W COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-M90706, TAC-M90707, NUDOCS 9611040003
Download: ML20134E676 (3)

Text

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.t g Commonwcalth 1:dison Company

% la$alle Generating Station 2601 North 21st fload Marseilles, 11.61311')'5' TelH1435 W 61

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October 24,1996 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555

Subject:

LaSalle County Station Units 1 & 2 Submittal of Relief Request RP-01 for the Inservice Testing Program NRC Docket Nos. 50-373 and 50-374

Reference:

U.S. NRC Safety Evaluation dated December 8,1995,  ;

ASME/ ANSI OMa-1988 (Part 6) (TAC NOS. M90706 and M90707).

The enclosure requests permanent relief from testing requirements stated in ASME/ ANSI OMa-1988 (Part 6), paragraph 5.2, for LaSalle County Station, Units 1 and 2, ECCS Water Leg Pumps. The relief request was previously submitted with interim relief granted as identified in U.S. NRC Safety Evaluation dated December 8,1995, (TAC NOS. M90706 and M90707).

Relief from ASME/ ANSI Oma-1988 (Part 6), paragraph 5.2, has been granted for Comed's Dresden Station. LaSalle County Station has performed an evaluation of installing flow instrumentation, as required by the l

SER, and has determined that no meaningful benefit would result.

ASME/ ANSI OMa-1988 (Part 6), Section 5.2 specifies that flow rate and differential pressure shall be measured with the pump operating at specified

test reference conditions. Relief request RP-01 proposes to record l mechanical vibration and differential pressure data quarterly. This data will l be trended to monitor for pump degradation. Since the pump is in continuous operation and each system has low pressure alarm instrumentation, a hydraulic problem would be readily identified by an operational anomaly for these pumps as opposed to pumps which are normally in a standby mode.

0100G4 $U i P

A Unicom company

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I LaSalle County Station requests that approval of the relief request be

'( provided by December 8,1996, to avoid exceeding the interim limitations originally granted for LaSalle Unit 1 and Unit 2 Water Leg Pumps.

l If there are any questions or comments concerning this letter, please refer

them to JoEllen Burns, at (815) 357-6761, extension 2383.

l Respectfully, l

/C\9 l W. T. Subalusky

! Site Vice President LaSalle County Station l l

Enclosure i

cc: A. B. Beach, NRC Region ill Administrator j

M. P. Huber, NRC Senior Resident inspector - LaSalle I D. M. Skay, Project Manager - NRR - LaSalle

F. Niziotek, Office of Nuclear Facility Safety - IDNS ,

l DCD - Licensing (Hardcopy: Electronic: )

l Central File l

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i O' LaSalle County St: tion l Inservice Testing Plan Units #1 and #2 Retision 2 l Pump Relief Request - RP-01 l

l Affected Components l

1 EPN Class Description 1(2)E22-C003 2 HPCS Water leg Pump l 1(2)E21-C002 2 LPCS Water Leg Pump l 1(2)E12-C003 2 RHR Water Leg Pump L

! Test Requirement l

OMa-06 Section 5.2 Test Requirement: Flow Measurement j Hasis for Relief i Instrumentation is not installed for measuring flow rates. Pump flow varies with system operation and system leakage; therefore, establishing set flow rates for testing purposes is not practical. The primary purpose of these pumps is to maintain the ECCS pump discharge lines filled to limit the potential for water hammer on ECCS initiation. System modification to provide test measuring locations places undue burden on the utility without demonstrating any increase in the level of plant safety. These pumps are in continuous l operation. Pump performance is continuously monitored by a low pressure alarm on each ECCS discharge header.

l LaSalle Station monitors the pump for degradation by measuring and recording pump inlet l pressure, discharge pressure, differential pressure, and vibration, with the differential pressure and vibration data trended. These measurements are taken quarterly and provide satisfactory indication of operational readiness as well as the ability to detect potential l

l degradation. In addition, the main ECCS pumps discharge headers each have a low l pressure alarm which continuously monitors the operability of the respective water leg j pump. Station Technical Specifications also verify operability of the water leg pumps by verifying flow through a high point vent on a monthly basis.

l Alternative Test Vibration measurement will be obtained under normal operating conditions and evaluated in accordance with OMa Part 6. LaSalle verifies operability of these pumps by pressure

maintenance of ECCS discharge lines within allowable limits. In addition, the inlet pressure, discharge pressure, and differential pressures are recorded, with the differential pressure and vibration data trended.

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