ML20099F108
| ML20099F108 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/05/1992 |
| From: | Beck G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-88-004, IEB-88-4, NUDOCS 9208120123 | |
| Download: ML20099F108 (2) | |
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1 PHILADELPHIA ELECTRIC COMPANY NUCLEAR GROUP HEADQUAF:TERS 955 65 CHESTERDROOK BLVD.
j WAYNE, PA 1908L5691 l
August 5, 1992 (ass)eso.sooo Docket No. 50-352 i
License No. NPF-39 U.S. Nuclear Regulatory Commission
~ ATTN: -Document Control Desk Washington, DC 20555
-Sub, lect:
Limerick Generating Station, Unit 1 Completion of Resolution Action Items in Response
..to NRC Bulletin No. 88-04, " Potential Safety-Related Pump Loss" Gentlemen:
This letter is to notify the NRC of the completion of all long-term resolut!w. oction items in response to NRC Bulletin (NRCB) No. 88-04, " Potential Safety-Related Pump-Loss," for Limerick Generating Station (LGS), Unit 1.
NRCB No.'88-04 requested licensees to investigate the following potential' design concerns invalving safety-rclated centrifugal pumps:
1) tM potential for a pump to dead-head when it is operating in the minimum flow recirculation mode in parallel with another pump (i.e.,
pump-to-pump interaction), and 2) the adequacy of the minimum flow capac!*y.
By letters dated June 30, 1988 and July 12, 1990, Philadelphia Electric
. Company-(PECo). responded to NRCB No. 88-04 for. LGS, Unit 1, and specified both short and long-term resolution action items and their status.
The resolution action items in res)onse to the adequacy of minimum' recirculation flow capacity were addressed in-tie. July 12, 1990 letter which indicated that no further
- corrective' actions were necessary in response to this concern.
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U.c$. Nuclear Regulatory Conrnission August 5, 1992
' Document Control Desk Page 2 Wi h regard to the pump-to-pump interaction concern, the July 12, 1990 letter confire d that the.only pumps affected by this concern at LGS, Unit I were the Core Spray (CS) system pumps, and indicated that a modification tu resolve this concern would be completed prior to restart from the fourth refueling outage for LGS, Unit 1.
1his modification, to resize the orifice in the coornon minimum recirculation flow line in each loop of the CS system and install an orifice in each individual CS pump's minimum recirculation flow line, was cwpleted tin May 23, 1992, prior to startup from the fourth refueling outage which ended on July 9, 1992.
Note that a similar modification was performed on LGS, Unit 2, in April 1989, prior to receipt of the operating license.
In addition, final modification testing also verified adequate minimum recirculatien flow capacity for the Unit 1 C$ pumps.
Thir represents completion of the long-tenn resolution action items in response to NRCB No. 88-04.
NRCB No. 88-04 requested that a written response describing the long-L M
resolution action items be provided to the NRC within 30 days of completion :
.he
' action items. Although the modification was completed on May 23, 1992, we consider completion of this action item to be concurrent with the end of tne fourth refueling outage which occurred on July 9, 1992 as stated previously.
Therefore, this response is being provided within 30 days from the date of startup of LGS, Unit 1 from its fourth refueling outa0c.
If you have any questions, please do not hesitate to contact us.
Very truly yours,
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G. J. Beck, Manager Licensing Section Nuclear Services Department cc.
T. T. Martin, Administrator, Region I, USNRC T. J. Kenny, USilRC Senior Resident :nspector, LGS k
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