ML19209C414
| ML19209C414 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 10/09/1979 |
| From: | Moody D YANKEE ATOMIC ELECTRIC CO. |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| WYR-79-116, NUDOCS 7910150543 | |
| Download: ML19209C414 (4) | |
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Tolephone 617 366-90ll rwx F10 3 9 0-0739 YANKEE AT0fdIO ELECTRIC COMPANY
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A 20 Turnpike Road Westborough, Massachusetts 01581
I/ifu l< EE B.3.2.1 WYR 79-116 October 9, 1979 United States Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
D. L. Ziemann, Chief Operating Reactor Branch #2 Division of Operating Reactors
References:
(a) License No. DPR-3 (Docket No. 50-29)
(b) USNRC Letter to YAEC dated March 15, 1979;
Subject:
Amendment No. 56 to Facility Operating License (c) YAEC Letter (WYR 79-45) to USNRC dated April 10, 1979;
Subject:
Schedule for Submittal of Asterisked Items for Review
Dear Sir:
Subject:
Information on Fite Protection System Design The design of additional fire protection systems and modifications to existing fire protection systems at Yankee Rowe has progressed to a point where it can be submitted for NRC staff review.
SER Section 31.1 - A means of detecting fire in the containment A series of twenty-five RTD's have been installed throughout the vapor container at Yankee Rowe. Their intended use is for monitoring VC Leak Rate. Yankee Rowe intends to also use them as a means of detecting a fire in the vapor container. These RTD's feed into a data logger which allows the alarm set point to be manually programmed.
The data logger will be modified to give an audible alarm in the control room.
It should be noted that this is not an NFPA code system, nor will any attempt be made to make it one.
It is an existing plant system which will be modified to alarm on a rise in heat level in the containment.
1~l45 030 7 91015 0 $71-3
s United States Nuclear Regulatory Commission October 9, 1979 Attention:
D. L. Ziemann, Chief Page 2 SER Section 3 1.5 - Water Suppression Systems DG Cubicle Suppression System A mai.ually operated (with thermal link'sprinker heads) sprinkler system will be installed in each of the three Diesel Generator cubicles. Each of the three syste=s will be independently controlled by way of a gate valve located outside each room and accessible to the operator by way of a reach rod.
This system is designed to provide a spray density of 0 3 GPM/ square foot.
The thermal links will fuse at 2200F.
Turbine Building Suppressien System Modifications and Additions The west end of the turbine building suppression system (Zone 1) will be revised to delete the H2 seal oil / transformer oil cooler deluge system, incorporating it into a new Special Hazards system; and to add suppression for those hazards under the switchgear room floor, which are the air compressors and the boiler feed pumps.
Zone 1 has been redesigned as an automatic system, and will provide a spray density of 0.3 spm/ft2 over the most hydraulically remote 3000 ft2 under the Turbine Operating Floor. Selected sections of pipe will be replaced so as to accommodate the revised flow without excessive pressure drop in the system.
The addition to Zone 1 is the suppression system for the air compressors and boiler feed pumps.
One sprinkler nozzle will be installed over each of the air compressors, and two sprinkler nozzles will be installed over each of the three boiler feed pumps.
The air compressor and Boiler Fee' Pump suppression system have been designed 2
for a spray density of 0 gpm/ft,
The east end of the turb
.e building suppression system (Zone 2) will be revised to delete the.;ater deluge from the 4500 gallon turbine oil recervoir.
It will now be protected by a foam syste=, which is described under SER Section 3 1.6.
The remaining areas of Zone 2 have been recalculated to provide a 2
spray density of 0 3 spm/ft.
To effect the revised spray density, selected piping will be replaced in order to hold the pressure requirements for Zone 1 and 2 similar.
The areas serviced by Zone 3 will not be affected by this change.
Presently, Zo'ne 1 and 2 are systems having both open and closed head sprinkler nozzles. These systems will be changed to wet pipe systems, with all existing open head sprinkler. nozzles replaced with closed head models.
e 4
1145 03i
, United States Nuclear Regulatory Commission October 9, 1979 Attention:
D. L. Ziemanr3 Chief Page 3 The "Special Hazard" system will be comprised of the H2 seal oil /
transformer oil cooler deluge system and five of the six building column sprays, G - 8 through G - 12.
The suppression system for column G - 7 will not be part of the special hazard system but will be fed directly from the inlet / discharge station. The column sprays will be of a wet pipe design, fitted witn fuseable link sprinkler heads with flat deflectors to allow for a conical spray pattern on the colu=ns. These column sprays will provide the required protection for the I-beams in the Control Room wall facing the Turbine Building.
The need for heat collectors on the sprinkler nozzles (column spray) for acceptable response time operation will be reviewed with the contractor. The columns will be protected per the. guidelines of NPFA 15 (1977) 4-4.3.3(b).
The sprinkler nozzles for columns G - 7 through G - 12 will be placed on alternate sides of the column starting at an elevation of 1029'-8".
There will be six sprinkler nozzles per riser, one each at elevaticns of 1029'-8", 1036'-8",
1044'-8", 1051'-8", 1061'-8" and 1070'-8".
Because of the great amount of interference in the area of the building columns, the riser will be field fitted on either the left or right side of the building columns.
The piping for the H2 seal oil / transformer oil cooler deluge system will be a combination of new pipe to and from the deluge valve and the existing delude system in the area requiring protection.
Auxiliary Heating Boiler Suppression System A wet pipe sprinkler system will be installed to completely cover the auxiliary heating boiler room. The System will be two tier because of room configuration.
The supply for the system will come from the inlet discharge station located outside the auxiliary heating boiler room between columns G - 7 and G - 8.
SER Section 3 1.6 - Foam Suppression System Turbine Lube Oil Tank Foam Suppression System The 4500 gallon turbine oil tank, located near the lube oil room, is currently protected by a water spray system.
The water spray system will be replaced by an automatically activated foam system.
An 80 gallon foam tank will be installed in the fan room located at the west end of the service building at an elevation of 1040'3 1/2".
A supervisory panel will be installed on the south wall of the turbine building between columns G - 5 and G - 7 at an approximate elevation of 1027'-8".
Water will be supplied to the foam system from the inlet / discharge station located between columns G - 7 and G - 8.
The piping will run up to the fan room and connect to a deluge valve and the foam tank.
The piping will then be run to the turbine oil tank where discharge will be through six foam-water sprinklers. The sprinklers will be mounted three or a side (east and west). The existing Zone 2 deluge system piping f
.the turbine lube oil tank will be removed to accomodate the new foan system.
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, United States Nuclear Regulatory Commission October 9, 1979 Attention:
D. L. Ziemann, Chief Page 4 A rotary joint hose reel station with 1 1/2" non-collapsible rubber hose and a turbojet nozzle will be installed on the south wall of the turbine building between columns G - 5 and G - 7 at elevation 1027'-8".
The hose station will serve as a test point for the foam system and as a device to fight an oil fire that either spreads from the area of the turbine oil tank or develops from a different source.
SER Section 3 1.7 - cas Suppression System The total flooding Halon 1301 suppression system for the suitchgear room has been designed to provide a Halon concentration sufficient to extinguish any expected fire in the switchgear room.
The minimum concentration, as called for by Codes, is 5% for 10 minutes.
Actuation for the Halon system will be by a cross zoned detection system designed to meet the conditions established for our particular situation, and will meet the Code requirements for such a detection system.
Prescatly, it is expected than an array of 22 detectors will be needed to adequately cover this room.
The Halen system is designed so that fans will be shut down, dampers will close, and local and remote alarms will sound upon actuation of the first detector, with release of the Halon upon actuation of the first detector in the second zone.
In addition to che above, the battery room will also be protected by a separate Halon 1301 flooding system.
It's design will be similar to thct of the switchgear room system.
SER Section 3 1.12 - DG room steel protection E:: posed structural steel in the diesel generator rooms will be protected with a one hour ra'ed fire a V. ardent coating.
We trust that the above dis 41ssions provide sufficient information for your review. If you have any question or comment, please contact us.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY
. E,.
D. E. Moody Manager of Operations EAS/dep
.