ML18085A806
| ML18085A806 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 01/02/1981 |
| From: | Schneider F Public Service Enterprise Group |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-24, NUDOCS 8102120458 | |
| Download: ML18085A806 (7) | |
Text
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Frederick W. Schneider Vice President Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/430-7373 Production Mr. Boyce H. Grier, Director Office Of Inspection and Enforcement U. S. Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. Grier:
NRC IE BULLETIN NO. 80-24 January 2, 1981 PREVENTION OF DAMAGE DUE TO WATER LEAKAGE INSIDE CONTAINMENT (OCTOBER 17, 1980 INDIAN POINT 2 EVENT)
SALEM GENERATING STATION UNITS NO. 1 AND 2 DOCKET NOS. 50-272 AND 50-311 In response to your letter of November 21, 1980, transmitting NRC IE Bulletin 80-24, the attached response is hereby submitted for your review.
Approximately ninety-eight (98) manhours were expended on this bulletin's review.
If you have any further questions, we will be pleased to discuss them with you.
Sincerely, CC Director Nuclear Regulatory Commission Off ice of Inspection and Enforcement Washington, D. c.
20555 Q
The following response corresponds to the Item Nos. of NRC Bulletin 80-44.
- 1.
The only open cooling water system present inside of Salem Units 1 and 2 containment is the containment fan cooling system.
The following information provides a summary des-cription of the system.
a) The mode of operation of the fan cooler is different during normal reactor operation and during a response to a LOCA.
During normal reactor operation, two to four of the five fan coil units are running depending on seasonal conditions and reactor power.
The remaining units are in a standby condition and are ready for servi.ce.
During a LOCA, the following, three different operating modes would be possible:
- 1. All five containment fan coil units and no containment
- spray,
- 2. Two containment spray trains and no fan coil units, or
- 3. Three fan coil units and one containment spray train.
The service water system flows to the operating and standby fan coil units.
b) The source of water to the fan coil units is service water.
Its typical chemical content is:
Item Minimum Averase Maximum Conductivity, micro-ohms 250.0 8,500.00 18,000.0 pH 6.2 7.1 9.0 Total dissolved solids, ppm 139.0 5,890.0 13,689.0 Suspended matter, ppm 5.0 135.0 694.0 Sulfides, ppm as H2s o.o 0.04
.48 Chlorides, ppm as NaCl 20.6 5,300.0 11,080.0 Dissolved oxygen, ppm 3.28 7.9 17.39 Chemical oxygen demand, ppm o.o 84.5 594.0 Total ammonia, ppm 0.025
- 32 2.33 Sulfates, ppm as so4 5.0 474.0 1,050.0 Free carbon dioxide, ppm o.o 3.6 26.2
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c) The piping and cooler tubes used in the fan cooling system are made of corrosion resistant materials.
The piping to the coolers is cement lined carbon steel *. The hi9h erosion piping sections are currently being replaced with 316 stain-less steel piping.
The cooler tubes are currently 90/10 CuNi, and these will be replaced with AL6X tubing.
d) Experience with system leakage is documented in the response to item 1 (e).
e) The following list is a history of the type of repairs done on the fan cooler system:
Work Order* No.
MD-2162 OD-6092 MD-2319 OP-0146 MD-2315 MD-2895 MD-2948 &
OD-10060 &
MD-2949 &
OP-90396 OD-10158 MD-0353 &
MD-903366 MD-905965 OD-916898 OD-915491 OD-932346 MD-912685 MD-910204 MD-936319 MD-936324 Description 11 FCU Motor'Cooler Replacement 14 FCU Motor Cooler Repair 13 FCU Motor Cooler Repair 15 FCU Motor Cooler Repair 13 FCU Motor Cooler Repair 11 FCU Motor Cooler Repair 11 through 15 FCU Replace Spool 14 FCU Motor Cooler Replace/Repair 12 FCU Motor Cooler Replace/Repair 13 FCU Repaired Flange Leak 11 FCU Motor Cooler Replace/Repair 13 FCU Motor Cooler Replace/Repair 15 FCU Motor Cooler Replace/Repair 11 FCU Motor Cooler Replace/Repair 11 FCU Primary* Cooler Coil Replace 11 FCU Motor Cooler Replace/Repair 11 FCU Primary Coo_ler Coil Replace 12 FCU Primary Cooler Coil Replace 12 FCU Motor Cooler Replace/Repair 14 FCU Primary Cooler Coil Replace 14 FCU Secondary Cooler Coil Replace 15 FCU Secondary Cooler Coil Replace Date 10/24/77 10/24/77 10/31/77 11/03/77 11/03/77 8/04/78 8/23/78 8/30/78 3/31/79 79 9/05/79 10/23/79 80 6/11/80 7/08/80 9/03/80 9/11/80 9/11/80 8/02/80 8/08/80 8/11/80 9/09/80 All repairs were done by welding of copper nickel to carbon steel.
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f) The service water system to the fan coole~s is provided with isolation valves.
Each fan cooler unit has an inlet and outlet isolation valve located outside containment.
Isolation of the individual cooler can be accomplished by remote air operated valves-from the control room or local manual operation.
The pilot. solenoid valves are the same power channel as the *power feed to the respective fan cooler.
Loss of power or air will cause the isolation valves to fail operi (due to safety function design of the fan coolers).
Redundant air is supplied to each valve g) to minimize probability of failure to close when needed.
The fail safe condition for the valves must be open due to safety function conditions.
This arrangement negates the vulnerability of this system to single failure.
There are no* provisions for testing the isolation valves in accordance with Appendix,J to 10CFRSO.
This procedure is* not required because the isolation valves do not meet the criteria of II. Hl through 4 of Appendix J to 10CFRSO.
h) The following instrumentation is in place to detect leakage:
Servic*e Water* Fl.ow - Each containment fan coil has an individual flow indicator on the control console.
In addition, a differential service water flow inlet to out-let will cause a bezel alarm on the control console.
Containment Fan Coil Le:ak Detector - The condensate from the fan coil drain pans is collected and funneled into a stand-pipe which has a high alarm and a high-high alarm which are located on the overhead annunciator*.
Also a selectable level indicator is located on the control console.
Dewr>otnt - A dewpoint measuring system is installed to continuously monitor inlet dew temperature of each fan coil unit and recorded on panel lRPl.
Radiation Dete*ction - A radiation detector is installed in the service water outlet piping of each containment fan coil.
Upon initiation of a high radiation level a bezel alarm is actuated and the coil is isolated by procedure.
Containment *s*ump* Level* Tndica:tion - On the control console two channels of analog level ind.ication are installed on Unit 1 and* are now being installed on Unit 2 as per post TMI requirements.
Also included is a containment sump over-flow alarm on the *overhead annunciator.
Procedures are in place to detect leakage in the contain-ment building utilizing both the reactor coolant leak.
detection procedure OI II-1.3.5 and reactor coolant leak rate computation procedure SP (0) 4. 4. 6. 2 C.dl.
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i) Radiation monitors are provided to minotor fan cooler service water discharge and provide alarms and indication to operators.
Grab sample analysis capability is also provided.
No automatic isolation of fan cooler service water ;i.s initiated upon radiation alarms.
The fan coolers are a safeguards system and perform an.accident mitigation function.
- 2.
The following actions and verifications were accomplished at our Salem plant~
a) A redundant means exists to detect and alert control room operators of *a significant.accumulation of water in the.
containment sump*.
There are two channels of level indica-tions on the control console.* Also included is a containment sump overflow alarm on the overhead annunciator.
The reactor sump has sump pump start-stop times and the.sump high level alarm indicated on the auxiliary alarm printer.
b) A positive means exists to determine flow from the con-tainment sump.
Observation of containment sump pump start and stop times are indicated on the auxiliary alarm printer *
. utilizing the standard plant operating instruction OI-1.3.5, the operator can thtis determine leak* ra,te into the sump.
A similar arrangement is provided for the reactor sump pump.
c) Whenever a containment fan coil leak detection high alarm
- is received, shift routine requires tha,t the total fan coil unit leak rate be determined in accordance with OI II-1. 3.5. (Reactor Coolant Leak Detection).
In add*i-tion, it is required that an auxiliary annunciator alarm summa,ry be initi.ated and evaluated at least once per shift, indicating sump pump operation and. unusual alarms.
These two shift procedures ass*ure that the plant operators have at least two methods of d.etermining water level in each location and at least one pump available to remove water from each sump location.
d).A review of the present leak detection systems and pro-cedures indicates they provide adequate means and measures
. to promptly detect, verify and isolate lea.king components or. systems within the co:ntainment buildingo e) All measures described in al through dl above are implemented; consequently, no interim surveillance measuI;'eS ha;ve been:
undertaken.
f) Procedures, as per the station's standard administrative procedures,.have been established to noti:ey the *NRC of any service water sys.tem leaks. within containment via a special license event report as a degradation of a containment boundary.
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- 3.
Portions of the component cooling system,.a closed cooling system, are inside the containment.
To date the *units have not experienced any significant amount of component cooling water leakage into the containment.
- 4.
This letter serves as a written report in response to your items listed in IE Bulletin 80-24.
The attached letter of affirmation is provided.
State of New Jersey SS:
county of Essex Frederick W. Schneider, being duly sworn according to law deposes and says:
I am a Vice President of Public Service Electric and Gas Company and as such, I find the matters set forth in our r~sponse dated January 2, 1981, to all items of Bulletin No.* 80-24 "Prevention Of Damage Due To Water Leakage Inside Containment" are true to the best of my knowledge, information, and belief.
Subscribed and this J II I.-
day sworn to before me of O=ti1lud/U-1
(/
(/
My commission expires Frederick w. Sc~der
' 1981