ML20049H483
| ML20049H483 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/01/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| IEB-79-15, SBN-217, NUDOCS 8203030127 | |
| Download: ML20049H483 (3) | |
Text
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PUBLIC SERVICE SEMOOK STATION
- I Engineering Office:
Company of New Hampshir e 1671 Worcester Road Framingham. Massachusetts 01701 (617) - 872 - 3100 Ma rc h 1, 1982 m
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j United States Nuclear Regulatory Commission Wd,
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Washington, D. C. 20555 1
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Attention:
Mr. Robert L. Tedesco N
Y,y' Assistant Director for Licensing g f,( '
Division of Licensing Re f e re nc es :
(a) Construction Pe rmit s CPPR-13 5 and CPPR-136, Docket Nos. 50-443 and 50-444 (b)
PSNil Letter, da ted September 5, 1979, " Deep Dra f t Pump Deficiencies," (Response to IEB 79-15), J. DeVincentis to NRC (c)
USNRC Letter, dated November 18, 1981, "Long-Term Operability of Deep Draf t Pum p s, " R. L. Tedesco to W. C. Ta llma n (d)
PS Nil Le t t e r, dated December 17, 1981, " Prog ra m f o r Demonstration of Long-Term Operability of Deep Draf t Pumps," J. DeVincentis to R. L. Tede sc o Subjec t :
Long-Tern Operability of Deep Draf t Pumps
Dear Sir:
Deep Dra f t Pumps, as described in IE Bulletin 79-15, are utilized at the Seabrook Station for two applications - Service Water Pumps and Cooling Tower Pumps.
The Station Service Water System is used to t ransf er the heat loads f rom various sources in both the primary and secondary portions of the plant to the Ultimate !! eat Sink.
Each unit has an identical Service Water System with no active components shared between the two units.
The Service Water System for each unit consists of two completely independent and redundant flow t ra in s.
Flow in each redundant train is supplied by two redunda nt Service Wa ter Pumps.
Each Service Water Pump is capable of supplying the flow required for post-LOCA recirculation with a loss of of f-site power.
The Station Service Water System is described in more detail in Section 9.2.1 of the FSAR.
ODI If the seawater flow to the Service Water Pumphouse is restricted due to seismically induced damage to the circulation water intake and/or discharge 3
tunnels, a mechanical draf t evaporative Cooling Tover is provided to dissipate shutdown and accident heat loads. Two full capacity redunda nt Cooling Tower
/O Pumps a re available for each unit.
The Ultimate lleat Sink is desc ribed in more detail in Section 9.2.5 of the FSAR.
8203030127 820301 PDR ADOCK 05000443 A
' United States Nuclear Regulatory Commission March,1, 1082 Attention:
Mr. Robert L. Tedesco Page 2 The Service Water Pumps and Cooling Tower Pumps are loce :ed in an area where post-accident maintenance and repair is possible, if sur h action were required.
Both the Service Water Pumps and the Cooling Tower Pumos are of similar design and are supplied by the Johnston Pump Company of Glentora, Ca li f o rnia.
During the initial installation of one of the pumps, a representative of the pump vendor will be present to provide technical assistance for the pump assembly and installation.
During the Preoperational Testing Phase, it is expected that each Unit 1 Cooling Tower Pump will be operated for a minimum of 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />.
Just prior to fuel loading of Unit 1 (1-2 months prior), the Unit 1 Service Water Pumps will be used to provide Service Water flow and the Cooling Tower Pumps will be held in a standby mode.
The Service Water Pumps will then be used continuously for Service Water Supply as described in the FSAR.
The Unit 2 Cooling Tower Pumps and Service Uater Pumps will be run similar to the Unit 1 pumps although the duration of the initial running time for the Cooling Tous r Pumps will be shorter.
Each Deep Draf t Pump will be continuously run for a least one week (168 hourc). During the one week running, vibration readings will be recorded every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Following the initial operation and construction check-out of each system, a Preoperational Test will be performed to verify system design.
This test will include a Pump Perf ormance Test to demonstrate the pump's head capacity curve.
Monthly surveillance testing and vibration measurements for each pump will be conducted following completion of the Preoperational Test, prior to OL i s sua nc e.
Subsequent to OL issuance, surveillance testing and vibration measurements will be conducted as outlined by ASME Section XI, lWP and controlled by Technical Specification for each pump.
Any maintenance performed on the Service Water Pumps or the Cooling Tower Pumps will be accomplished in accordance with manufacturer's recommendations and by approved procedures.
Following any significant pump maintenance, Surveillance Testing will be conducted prior to considering the pump operable.
Long-Term operability of the Service Water and Cooling Tower Pumps is demonstrated by (1) using the appropriate installation procedures; (2) testing and verifying design features; (3) an extensive running period of the Cooling Tower Pumps and the continuous operation of the Service Water Pumps; and (4) the ability to perform post-accident maintenance and repair of these pumps.
Contingent upon your concurrence with our program described herein, we plan to revise FSAR Section 3.9.3 as follows:
Program to demonstrate long-term operability of Deep Draf t Pum p s.
The Service Water Pumps and the Cooling Tower Pumps are the only saf ety-related Deep Draf t Pumps utilized at the Seabrook Station.
1
. United States Nuclear Regulatory Commission Ma rch 1, 1982 Attention:
Mr. Robert L. Tedesco Page S The following program will be implemented to demonstrate the long-tern operability of these pumps.
1)
Vendor recommended procedures will be utilized for pump installation.
2)
A vendor representative will be present for initial pump assembly and installation.
3)
Each pump will be run continuously for 168 hours0.00194 days <br />0.0467 hours <br />2.777778e-4 weeks <br />6.3924e-5 months <br /> with vibration measurements recorded every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
4)
Each pump will undergo a Pump Perf ormance Test to verify design criteria.
5)
Monthly surveillance testing and vibration measurements for each pump will be conducted following completion of the Preoperat ional Test, prior to OL issuance. Subsequent to OL issuance, surveillance testing and vibration measurements will be conducted as outlined by ASME Section XI, IWP and controlled by Technical Specification for each pump.
6)
Pump maintenance will be perf ormed by approved procedures.
7)
Following significant maintenance on a pump, a Surveillance Test will be conducted prior to considering the pump operable.
Very t ruly yours, N
J. DeVince nt i s Project Ibnager JDV: ALL: dad l
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