ML20133B123
| ML20133B123 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 10/01/1985 |
| From: | Mittl R Public Service Enterprise Group |
| To: | Butler W Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8510030031 | |
| Download: ML20133B123 (3) | |
Text
, _ _ _ _ _ - _ _ _
s O PS G Company Put*c Service Electric and Gas 80 Park Plaza, Newark, NJ 07101/ 201430-8217 MAILING ADDRESS / P.O. Box 570, Newark, NJ 07101 t
Robert L. Mitti General Manager Nuclear Assurance and Regulation October 1, 1985
)
Director of Nuclear Reactor Regulation U.S.; Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 EAttention:
Mr. Walter Butler, Chief Licensing Branch 2 Division of Licensing Gentlemen:
REQUEST FOR ADDITIONAL INFORMATION - LOSS OF ALL CONTROL ROOM VENTILATION HOPE CREEK GENERATING STATION DOCKET NO. 50-354 Pursuant to the request for additional information on the loss of all control room ventilation dated September 4, 1985, an analysis was performed on the effect of the loss of ventilation and cooling to the control ~ room and electrical I
equipment room.
As the ventilation systems for the control I
room and electrical equipment rooms are independent, a sepa-
}
rate analysis was performed for each.
The initial conditions used in the analyses were based on the normal plant operating temperatures; 76*F in the control room and 83*F in the electrical equipment room.
It was
-assumed the remaining HVAC systems continue to function and that normally operating components in the af fected rooms remained energized.
The maximum design ambient temperature limit for the equip-
~
ment and control panels is 10 4
- F.
This ensures that the component operating temperatures are not exceeded.
The rate of temperature rise in the control room and electrical equipment room is shown on the attached figure.
The control room operator has ample time; 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> for the control room and 3.5 ho~urs-for the electrical equipment room, to decide whether to continue normal operation while ef forts are being made to bring the disabled ventilation systems back on line, or. revert to exis ting procedures to shutdown the unit.
j g
i 8510030031 851001 1
I The Energy People PDR ADOCK 05000354 F
PDR 95 4912 (4M) 7 83
e
.. w Director of Nuclear Reactor Regulation 2
10/1/85
~Even though separate and redundant ventilation equipment is provided and the failure of both' emergency trains is very remote, the analysis indicates that the operator has suf-ficient time to assess the situation and take appropriate action.
In addition, it should be noted that there are
- several actions the operators can take to mitigate the ef fects of this type of condition, such as opening doors and installing temporary fans.
Temperature elements are located in the control room such that a representative control room ambient tempe rature is sensed and the operator can monitor the temperature in accordance with the surveillance requirements of Technical
~
Specification 4.7.2.
Should you have any questions in this regard, please contact us.
Very truly yours,
/
I' ff Attachment ~
C D. H. Wagner USNRC Licensing Project Manager A.
R.
Blough USNRC Senior Resident Inspector DQ05 1/2
CONTROL & ELECTRICAL EQUIPMENT RMS 108 107 106 105
^~
104 103 R
102
~
101
^
100 99 98 - /
m" 97 E
[
96 RII u.
95 7
g 94 h
93 - 7; y
92 j
91-d 90 8
89 0
88 87 86 85 84 1 9 83 '
82 I 81 80 79 78 77 76 M 0
30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 TIME ELAPSED AFTER LOSS HVAC - MIN A CONTROL RM (5510)
O ELEC. EQUIP. ROOM (5302)
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