ML20084H888
| ML20084H888 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 05/03/1984 |
| From: | Bayne J POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| JPN-84-28, NUDOCS 8405080246 | |
| Download: ML20084H888 (6) | |
Text
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May 3, 1984 JPN-84-28 Director of Nuclear Reactor Regulation U.
S.
Nuclear Regulatory Commission Washington, D.
C.
20555 Attention:
Mr. Domenic B. Vassallo, Chief Operating Reactors Branch No. 2 Division of Licensing subject:
James A.
FitzPatrick Nuclear Power Plant Docket No. 50-333 Additional Information Concerning Crescent Area Ventilation Surveillance Tests
Reference:
1.
PASNY letter, J. P. Bayne to D.
B. Vassallo, dated February 25, 1983 (JPN-83-14), regarding Proposed Technical Specification Changes for the Crescent Area Ventilation Surveillance
Dear Sir:
This letter is submitted in response to a request for additional information concerning the crescent area ventilation surveillance testing (Reference 1).
A comprehensive report on this subject is enclosed with this transmittal.
Should you require further information or clarification, please contact Mr. J. A. Gray, Jr. of my staff.
Very truly yours, 3
J/
aynh
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E'xecutive Vice President Nuclear Generation cc:
Office of the Resident Inspector U.
S.
Nuclear Regulatory Commission P. O. Box 136 g{
Lycoming, New York 13093 8405080246 840503 PDR ADOCK 05000333 P
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ATTACHMENT TO JPN-84-28 NEW YORK POWER AUTHORITY.
JAMES A.
FITZPATRICK NUCLEAR POWER PLANT NRC Question 1:
Identify all the unit coolers and Emergency Core Cooling System L
(ECCS). component & equipment located in the east and west crescent areas.
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NYPA Response:
i There are ten (10) unit coolers in the crescent area; five (5) in the east crescent area _and five (5) in the west crescent area (see fig. 1).
ECCS equipment and components in each of the crescent areas.are listed in Table 1 below and shown on Figure 2:
Table 1 East Crescent Area West Crescent Area Unit Coolers:
UC-22B,D,F,H & K UC-22A,C,E,G & J Power Supply:
MCC-C-163 MCC-C-153 i
(Emergency Bus "B")
(Emergency Bus "A")
t ECCS Equipment and Components in each area:
Core Spray Pump (14P-1B)
Core Spray Pump (14P-1A)
NRC Question 2:
Describe the function, operation, and power sources of these unit coolers.
NYPA Response:
3 The crescent area unit coolers are used to supplement the cooling capacity of-the Reactor Building area ventilation systems.
These unit coolers help control crescent area ambient tempera tures to ensure performance and operability of ECCS I
components.
The coolers normally are in operation, j
In order'to maintain crescent area temperatures, the cooling capacity of unit coolers is controlled by the service water system temperature control valve (TCV) in conjunction with an area thermostat located near-the unit.
Each cooler consists of a cooling coil and one (1) fan.
An individual unit cooler is not associated with an individual'ECCS component; the coolers j
collectively ensure proper temperature conditions in the east' or west crescent area.
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The unit coolers are supplied with electrical power from the emergency portion of the Plant Service AC Power Distribution System as shown on Table.l.
During an emergency with loss of power, TCV's will fail open and the operator can maintain temperatures manually by starting or stopping-crescent area unit coolers from the control room ventilation panel.
NRC Question 3:
Discuss the surveillance requirements, naturelof the tests, an'd reason for operator witnessing test at the area.
1 l
NYPA Response:
I Present Technical Specification surveillance requirements specify that unit coolers serving the ECCS components will be checked for operability.during the surveillance testing of the j
associated ECCS pumps.
These pumps are listed below:
l
-High Pressure Coolant Injection Pump (23P-1)
-Low Pressure Coolant Injection Pumps (10P-3A, B, C & D)
(an operating mode of the Residual Heat Removal System)
-Core Spray Pumps (14P-1A & B) 1 According to ECCS pump surveillance requirements, the pumps-are-individually tested once a month which means that the crescent 1
area unit coolers (east and west) are tested on a monthly basis as well.
Since there are four (4) pumps in the east crescent.
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area and three (3) pumps in the west crescent area, the unit j
coolers in that specific area are tested as a group when each pump in each area is tested; thus, the coolers are tested on an i
average of three (3) times a month.
As a result, an' average of
^
30 tests are conducted in one (1) month.
The testing of these unit coolers involves the' changing of the temperature set point which leads to the cycling of the temperature control valve (TCV)'and requires an operator to observe the valve stroke to verify movement and travel.
In-addition, the fans are' checked for. operability.
4 NRC Question 4:
How reliable are the performances ofLthe unit coolers-based on operating history?
Have the surveillance tests been successful?'
i NYPA Response:
Surveillance tests for the-unit' coolers have been successful and convincing. 'Since the start ~of commercial operation (July 1
l 1975), approximately eleven'.(ll) tests have-revealed the need-l for minor repairs, such as; sticky auxiliary contacts in-fan e
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motors; no output on temperature indicator control instruments; and circuit breakers requiring repairs.
These unit coolers have demonstrated an excellent performance record with no major breakdowns.
They are considered highly reliable and rarely in need of repairs.
t Summary Excessive testing of the unit coolers is inconsistent witn ALARA and does not improve reliability.
The proposed test frequency, as outlined in Reference 1, of once every three (3) months conforms to the Inservice Inspection Valve Test Program requirements and will not degrade the reliability of the equipment.
This will reduce personnel radiation exposure while maintaining a high level of equipment reliability.
Therefore, the proposeo revisions to the Technical Specifications, which will require that unit coolers serving the ECCS components be checked for operability once per three (3) months, are justfied.
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