ML18082A144
| ML18082A144 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 04/07/1980 |
| From: | Mittl R Public Service Enterprise Group |
| To: | Parr O Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8004110426 | |
| Download: ML18082A144 (3) | |
Text
0 PS~d' Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201/430-7000 April 7, 1980 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Attention~
Mr. Olan D. Parr, Chief Gentlemen:
Light Water Reactors Branch 3 Division of Project Management RWST LOW LEVEL ALARM SETPOINTS NO. 2 UNIT SALEM NUCLEAR GENERATING STATION DOCKET NO. 50-311 PSE&G hereby submits the following information regarding the RWST low level alarm setpoints in response to telephone con-versations with Mr. F. Orr of your staff on April 1 and 2, 1980.
The RWST low-level alarm setpoint will be set at 150,000 gallons (measured from tank bottom).
This setpoint insures that sufficient volume will be available in the RWST to al-low changeover from injection to recirculation given the worst case single failure.
The worst case single failure is defined as one which causes the greatest outflow from the RWST for the longest period of time.
The worst case single failure is the inability to trip one of the RHR pumps at the low-level setpoint.
The volume of water expected to be used during the changeover procedure for this case is about 103,500 gallons.
As can be seen on Figure 1 (attached), 118,800 gallons is available in the tank to allow the operator to complete the procedure.
A backup low-level alarm will be provided to alert the oper-ator to low tank level in the event the normal low-level alarms fails or is disregarded.
The setpoint for this alarm will be at 119,000 gallons (measured from tank bottom).
Placing the alarm at this location allows an adequate volume between the two low-level alarms to preclude any possibility of coincident alarms caused by instrument error.
An ade-quate time delay will exist between the two alarms.
The Energy People so o.. 4 11 o y..a~
95-0942
.r Mr. Olan D.
Parr 4/7/80 The alarm will be set high enough in the tank to allow the operator to change over from injection to recirculation prior to depleting tank volume.
It has been conservatively estimated that the operator will use about 73,000 gallons to change over from injection to recirculation under normal switchover conditions.
As can be seen on Figure 1, a mini-mum of 76,800 gallons will be available in the RWST.
If changeover from injection to recirculation does not be-gin until the backup low-level alarm point, the running time of the containment spray pumps and the amount of NaOH deliv-ered to the sump will be reduced (as opposed to switchover beginning at 150,500 gallons).
Under these conditions the sump pH after the RWST volume is depleted is expected to be greater than 8.0.
This consideration results in operator response*time being the limiting factor in determining RWST setpoints.
The in-formation above shows that required operator response times will not be compressed if the alarm setpoints mentioned are used.
The change in alarm setpoints will be accomplished prior to low power testing.
Should you have any questions, do not hesitate to contact us.
Attach.
HD6 1/2 Very truly yours,
?1#Jir R. L. Mittl General Manager -
Licensing and Environment Engineering and Construction
rl~0.1?£ I RErUEL./,,Vt; wATEJ:!. sroZ4t;E /A~
_#1=.LfLAkH
_.:j7~00 6'&~-* ~
.I£",c#. s ?LC: /'l/./J~3~~ roo r:2.;fL ~.
~---------
=---
rO'/ERFt.tnJ
~..300~~{.S.*
li!1/00qALS.
12JICO t;At.S..
/°'SC>()t;At..S.
-Ll..o~r~. ~;f/lo~}
lr.3,.~ t;ALS
(/-1'/./J. YO.llJ/f6" AYAIL.A.B1.£ FoR 1AJ-TEcr.1cw)
/~ S-a> t;Al.S.
.s "T.R. £ ~~o~)
/"i.!""£ 6-AL.S.
- /_,,IJ.
- :, r~.£< ~o..t2)
~" ~OO(fh l' Loururr Tc e..s. J'WtJ'~ ourur rc "1.11;i,.sz, Cll<> l'oNl'l TAAJ~ "5o7TCV'f (.).S£/) "'/.S A"E,rE.K£A.Jcc ro,,e 'T£C#.Sl"£c *.h'/..V.jH~ L..01.
.t.o ('.B-4C~*t.JP)J ~o-~o ALA£fi.S j ;fAJLJ L);(J c,J~AJU.E ~c~~L.