ML20237K743
| ML20237K743 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/27/1987 |
| From: | Tiernan J BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8709080001 | |
| Download: ML20237K743 (3) | |
Text
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BALTIMORE
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GAS AND j
ELECTRIC i
CHARLES CENTER R O. BOX 1475 BALTIMORE, MARYLAND 21203 JOSEPH A.TIERN AN Vict PRE 6BDENT NucLEAn ENERGY August 27, 1987 U. S. Nuclear Re;ulatory Commission
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Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 NRC Insoection Report Nos. 50-317/87-14: 50-318/87-16 Gentlemen:
This refers to Inspection Report 50-317/87-14, 50-318/87-16; which identified a concern regarding the Auxiliary Building drain system. We are presently evaluating this system and Enclosure (1) provides our present and future actions to resolve this matter.
Should you have any further questions, we will be pleased to discuss them with you.
Very truly yours, g.
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JAT/LSL est f
Enclosure ec:
D. A. Brune, Esquire J. E.
Silberg, Esquire R. A.Capra, NRC S. A.McNeil, NRC W. T. Russell, NRC E. C. Wenzinger, NRC T. Foley/D. C. Trimble, NRC 87090D0001 070P27
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ENCLOSUR E (I)
REPLY TO NRCINSPECTION REPORT i
50-317/87-14; 50-318/87-16 l
I In Section 2.c of the subject inspection report, a concern regarding the Auxiliary i
Building drain system was expressed. We acknowledge and share your concern. The peri-odic backing up of Auxiliary Building drains has occurred despite past efforts to clean, modify, and ma ntdn this system. Presently, the following factors suspected of
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contributing to the systere backing up are, j
j (1)
A reduction in drain piping capacity due to material accumulation, (2)
System check valves malfunctioning, and (3)
Pumping the Emergency Core CoeUng System (ECCS) pump room sump to the Miscellaneous Waste Receiver Tank (MWRT) via the Auxiliary Building drain system (the only path available by design).
We are presently evaluating the Auxiliary Building drain system. This evaluation includes both a review of the design of the system check valves, as well as a possible modification to separate the ECCS pump room sump flowpath to the MWRT from the temain-ing normal flowpaths to the MWRT. We are also considering the use of improved screens for floor drains to minimize system blockage. In the interim, the Auxiliary Building drain system will be cleaned and a frequency estab;ished for future cleaning. The preventive maintenance schedule for ckaning the MWRT duplex strainers will be reviewed to ensure a frequency consistent with planned work which could affect Auxiliary Building drains.
We will monitor the results of the above efforts, and will consider further system modifications if the results do not meet our expectations.
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