ML17201M231
| ML17201M231 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 11/17/1988 |
| From: | Siegel B Office of Nuclear Reactor Regulation |
| To: | Bliss H COMMONWEALTH EDISON CO. |
| References | |
| TAC-59851, TAC-59852, NUDOCS 8811210293 | |
| Download: ML17201M231 (4) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Docket Nos.:
50-237 and 249 Mr. Henry E. Bliss Nuclear Licensing Manager ColTlllonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Bl1ss:
November 17, 1988
SUBJECT:
SEALING OF OPENINGS IN ELECTRICAL CABINETS AT DRESDEN STATION UNITS 2 AND 3 (TAC NOS.:
59851 AND 59852)
By letter dated September 15, 1988, you requested relief from an earlier corrmitment to seal all openings in safety-related electrical cabinets to prevent entrance of water during fire suppression activi~ies. Four safety-related cabinets were found during a recent inspection to have gaps and ventilation openings that could allow water to enter and possibly damage the safety-related equipment inside. Although the gaps have been sealed, you stated that the ventilation openings are required for proper operation of the equipment.
In your letter you stated that the factors that mitigate against unacceptable consequences due to these ventilation openings are:
- 1.
No fixed water fire suppression systems are installed above any of these cabinets.
2*
Fire hoses provided for manual fire suppression are equipped with electrically safe fog nozzles (a straight stream is not possible).
- 3.
Signs posted near each fire hose station caution against use by personnel who are not trained and qualified fire brigade members.
- 4.
Alternative safe shutdown equipment, that is independent of the area where these four cabinets are located, is provided in accordance with Section 111.G of Appendix R to 10 CFR Part 50.
The staff has reviewed the infonnation provided and agree that measures are in place to preclude water entry into the four cabinets and there is minimal safety significance connected with the ventilation openings in these four 8811210293 881117 PDR ADOCK 05000237 P
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ii Mr. Henry safety-related electrical cabinets because alternativ~ shutdown paths exist.
We, therefore, conclude that the relief requested by you from your earlier co11111itments to seal these ventilation openings should be granted.
cc: See next page
~n~~. Project Manager Project Directorate III-2 Division of Reactor Project - III, IV, V, and Special Projects
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Mr. Henry E. Bliss Convnonwealth Edison Company cc:
Michael I. Miller, Esq.
Sidley and Austin One First National Plaza Chicago, Illinois 60603 Mr. J. Eenigenburg Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 U. S. Nuclear Regulatory Co1TUT1ission Resident Inspectors Office Dresden Station Rural Route #1 Morrfs, Illinois 60450 Chainnan Board of Supervisors of Grundy County Grundy County Courthouse Morris, Illinois 60450 Regional Administrator Nuclear Regulatory Conmission, Regfon III 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Ill;nois 60137 Mr. Michael E. Parker, Chief Division of Engineering Illinois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704 Dresden Nuclear Power Station Units 2 and 3
November 17, 1988
- ~.
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Mr. Henry safety-related electrical cabinets because alternative shutdown paths exist:
We, therefore, conclude that the relief requested by you from your earlier commitments to seal these ventilation openings should be granted.
cc:
See next page DISTRIBUTION
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PDIII-2 Plant file DNotley CMcCracken PDII I-2: PM BS1egel :dm1J9 11//] /88 /
PD II I-2: L~ 1 LLuther c?Z-'1' 11//7/88 Byron Siegel, Project.Manager Project Directorate III-2 Division of Reactor Project -
III~
IV, V, and Special Projects C-=1o~2:fo:t>, ~Jl<C-v DMuller 11//':f-/88
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