ML20096E628
| ML20096E628 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 01/10/1996 |
| From: | Querio R COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-95-002, IEB-95-2, NUDOCS 9601220313 | |
| Download: ML20096E628 (2) | |
Text
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Commonwealth luson Company lealle Generating $tation
. 2(df North 21st Itoad Marseilles, 11.61341-9757 Tel Hl5-3574761 January 10,1996 United States Nuclear Regulatory Commission Washington, D.C. 20555 i
Attention: Document ControlDesk J
Subject:
LaSalle County Station, Units 1 and 2 120 Day Response To NRC Bulletin 95-02 on Multiple ECCS Pump Run
Reference:
- 1. Letter dated November 14,1995, transmitting LaSalle County Station Unit I and 2 Response to NRC Bulletin 95-02
" Unexpected Clogging of a Residucl Heat Removal (RHR) Pump 4
Strainer while Operating in Suppression Pool Cooling Mode" l
NRC Docket Numbers 50-373 and 50-374.
The enclosed attachment contains LaSalle County Station's supplemental response to the NRC Bulletin 95-02 that was transmitted with the Reference 1 letter.
If there are any questions or comments concerning this letter, please refer them to me at (815) 357-6761, extension 3600.
i Respectfully, i
)
JD
. /
/
R. E. Querio Site Vice President i
LaSalle County Station cc: H. J. Miller, Regional Administrator, Region III M. D. Lynch, Project Manager, NRR H. J. Simons, Acting Senior Resident Inspector, LaSalle D. L. Farrar, Nuclear Regulatory Services Manager, NORS Central file 9601220313 960110 PDR ADOCK 05000373 n
G PDR f'\\'
G 220120 A Unicom Comp.iny
ATTACHMENT
]
j SUPPLEMENTAL RESPONSE TO NRC BULLETIN 95-02 1
"Usempeeted Clogging of a Residual Heat Removal (RHR) Pump
^
j Strainer while Operating la Suppression Pool Cooling Mode" NRC DOCKET NUMBERS 54373 and 50-374 i
I Action 2: Confirmation of Operability LaSalle Units 1 & 2 4
Test Evaluation for LST 95-083, Rev. O, Entitled 'ECCS Suction Strainer Test'.
Performed on LaSalle Unit 1 on January 4,1996.
Performed on LaSalle Unit 2 on January 5,1996.
A multiple ECCS pump test was performed in order to confirm the operability of the ECCS Suction Strainers. LST-95-083,"ECCS Suction Strainer Test," was performed j
by simultaneously running the 'A' RHR and LPCS pumps in the pool-to-pool i
align==t Temporary pressure gauges, with a calibrated accuracy of 0.3 psi, were
~
installed on the suction legs of each pump.
The complete test was performed with satisfactory results. The pumps were run at a combined continuous flow of 13550 gpm for greater than 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. The actual number of pool inventory turnovers was calculated to be greater than 6.5 (4 minimum). The hourly pump suction pressure, trended over the entire test duration, did not decrease from the first steady-state set of readings taken after the pump was started. The suction pressure data indicates that there is no increasing flow resistance at the suction i
1 strainers, and there was no change in pump flow rates over the duration of the test.
These tests are deemed satisfactory.
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