ML19312D982
| ML19312D982 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 05/27/1980 |
| From: | Moody D YANKEE ATOMIC ELECTRIC CO. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| WYR-80-57, NUDOCS 8006030028 | |
| Download: ML19312D982 (4) | |
Text
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4 Telephone 617 366-90ll
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Twx 710-390-0739 YANKEE ATOMIC ELECTRIC COMPANY B.s.2.1.
WYR 80-57 20 Turnpoke Road Westborough, Massachusetts 01581
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May 27, 1980 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. Dennis M. Crutchfield, Chief Operating heactors Branch #5 Division of Licensing
References:
(a) License No. DPR-3 (Docket No. 50-29)
(b) USNRC Letter dated April 23, 1980,
Subject:
Fire Suppression System Requirements (c) USNRC Letter dated March 15, 1980, Amendment No. 56 (d) YAEC Letter to USNRC dated October 9,1979, WYR 79-116
Subject:
Fire Suppression Systems
Dear Sir:
Yankee Atomic Electric Company has reviewed the staff comments enclosed as part of Reference (b) above. We wish to point out that the bulk of the description of these suppression systems was sent to you on October 9, 1979 with a follow-up letter including conceptual drawings, on November 13, 1979 During the six months that the NRC staff has had this design information, j
Yankee has prepared specifications and received bids on the systems in order i
to meet the proposed installation schedule. We are currently ready to place a purchase order for the work with a contractor.
However, the additional engineering required to accommodate the staff positions and the potential long delivery time for additional components to meet these changes will force a change in the implementation schedule for the work. Our commitments and the j
schedule dates follow here:
3 1.1 Fire Detection Systems Our previous submittal on this subject said that we would be using a series of RTD's installed throughout the containment. Further investigation of this method has led us to conclude that it is not j
appropriate for this application. Our design will, instead, use lineal fire detectors, arranged to provide early warning fire detection for in-situ ;ombustibles. We do not intend to provide early warning detection for transient combustibles. With the exception of the Control Rod Drive cables and the Fuel Manipulator Crane cables, cable in the Yankee Rowe containment is in conduit,
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Unit;d Stat a Nuclccr R;gulatory Commicaion May 27, 1980 AttIntion:
Mr. Dennio M. Crutchfield, Chisf Page 2 V
The Reactor Coolant Pumps are canned rotor pumps, and do not require oil lubrication.
The transient combustibles present consist of protective clothing stored at various control points, scae wooden crates, and some polyethelene. These combustibles are in small lots, and are well separated from each other. They are not located near any large concentration of combustible materials.
The plant is shut down when these transient combustibles are present, therefore a fire would not prevent safe shutdown.
Manual fire suppression is immediately available within the containment, and proper administration controls are exercised over the transient combustibles and any sources of ignition which might come from work going on in the containment.
It is, therefore, our contention that early warning fire detection is not necessary for transient combustibles within the containment.
The schedule date for implementation of fire detectors for in-situ combustibles is November 1, 1980.
3 1.5 Water Suppression Systems b.
Diesel Generator Room Sprinkler System We will make the change required by the staff.
c.
Hydrogen Seal Oil Unit We will make the changes required by the staff.
d.
Turbine Building We will make the changes required by the staff.
e.
Auxiliary Boiler Room We acknowledge that the system is approved as designed.
The schedule date for implementation of all the changes under 31.5, Water Suppressions Systems, is November 1, 1980.
3 1.6 Foam Suppression System The design of this system will meet NFPA 16-1974. The foam used is 35 fluoroprotein, and is applied through six nozzles spaced to cover the sides and the ends of the Turbine Lube Oil Tank, flowing down to cover any spilled oil in the dike area surrounding the tank. The schedule date for implementation of this change is November 1,1980.
317 Gas Suppression System
-1.
The detection system will be ionization type. Actuation of the system will be cross-zoned, with two detector alarms required a
Unitt'd Stttra Nuclscr Rigulatory Commission May 27, 1980 Attsntion:
Mr. Dennis M. Crutchfield, Chief Pags 3
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for actuation. The schedule date for implementation of this change is November 1, 1980.
3 1.12 Control of Combustibles e.
Diesel Fuel Oil Line 1.
Section 5.6.6, pages 5-6 and 5-7 of Reference (c), specifically states that our proposed modifications to this area are acceptable. We have proceeded with the modification based upon that NRC staff acceptance. It is disconcerting, to say the least, to receive a new requirement for that area from the staff at this late date.
It is our feeling that the staff is not aware of the full extent of the modifications we will be providing; so we will repeat them here, for clarification.
We will provide a curb, with a fire proof partition to confine any spray to the area of the curb.
The curbed arca will drain to a collection tank. That tank is provided with a high level alarm, which will indicate to the control room personnel that there is a leak in the area.
This allows the operator to find the leak and shut the supply to that line.
In addition, we will provide a vent connection to the drainage tank. This will ensure that the tank does not fill and back up, cutting off drainage from the area.
We feel these modifications adequately respond to the NRC staff concerns, as they apparently did a year ago, and we do not intend to make any further changes in this area.
d.
Diesel Generator Rooms 1.
As previously stated in Reference (d), we will provide a one-hour fire retardant coating for the structural steel beams in the diesel generator rooms.
The schedule date for implementation of these changes is November 1, 1980.
3.2.1 Smoke Detection System Tests 1.
In-situ We acknowledge that this is deferred until new criteria are developed by BNL.
2.
Bench Tests The type and brand of detectors used at Yankee Rowe have been bench tested by other facilities (Vermont Yankee and Maine Yankee) using,the same type of materials - clothing, plastic, various types of cable material - to ensure that they will
Unit:d Stntic Nuclccr Rigulatery Commiccion May 27, 1980 Attintion:
Mr. Dennis M. Crutchfield, Chief PIga 4 h
a, provide prompt response and have adequate sensitivity to the
-products of combustion for the combustibles in the area where smoke detectors are installed.
3 2.2 Fire Water Supply Yankee Atomic will provide equipment to increase the pumping capacity of the system:
A 2000 gpm diesel-driven fire pump, within its own pump house, supplied from a new 350,000 gallong Fire Water Tank, will be installed and tested in accordance with the requirements of NFPA-20. Connections to the water main will be at a point remote from the connection from the existing two motor-driven pumps. The schedule date for implementation of this change is November 1, 1980, 3.2 3 Shutdown Capability We acknowledge that th.4s is deferred to the SEP.
We trust this respands to your concerns.
If you have any further qu6stions or comments, please contact us.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY NL.E,.
4 D. E. Moody Manager of Operations JAK/noj
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