ML18079A386
| ML18079A386 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 05/23/1979 |
| From: | Librizzi F Public Service Enterprise Group |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7906060270 | |
| Download: ML18079A386 (6) | |
Text
"
PS~G Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /430-7000 May 23, 1979 Director of Nuclear Reactory Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Mr. Albert Schwencer, Chief Operating Reactors Branch 1 Division of Operating Reactors Gentlemen:
RESPONSES TO INFORMATION REQUESTED VIA TELECOPY OF 5/10/79 UNITS NO. 1 AND 2 SALEM GENERATING STATION DOCKET NO. 's 50-272 AND 50-311 In accordance with your telecopy request we are submitting the information as follows: -
Responses to Information Requested -
Steam Generator Schematic Diagram mo:i-mts 9
- fir. W,\\llSOI'
.>§:,,. sml\\ln:
Very truly yours,
~
Frank P. ~
General Manager -
Electric Production
\\sE 95-2001 (200M) 2-78
___ j
e ATTACHMENT 1 I. PRESSURIZER A.
Pressurizer Heaters
- 1.
Balance of Plant Instrument Power Source
- a.
Vital Instrument Bus lC
- b.
115 VAC
- c.
Class lE
- 2.
Back Up Heater Power Source
- a.
4 KV Group Buses E and G
- b.
Non Class lE B.
Backup Heaters
- 1.
- 2.
ON set point OFF set point
-25 psi
-17 psi C.
Variable Heater Transfer Function
- 1.
- 2.
FULL ON FULL OFF
-15 psi (linear)
+15 psi (linear)
D.
Spray Valve Transfer Function
- 1.
- 2.
START OPEN FULL OPEN
+25 psi (linear)
+75 psi (linear)
E.
Power Operating Relief Valve #2
- 1.
- 2.
OPEN set point CLOSE set point
+100 psig
+80 psig F.
Describe Controller Transfer Function
- 1.
Formula s
Kl ( 1 + l:_fu + T 2.
1
- 2.
NOTE:
Variations in Lead/Lag terms constants are not meaningful because of the slow heater response.
- 3.
PORTIONAL GAIN 5 psi/psi
- 4.
INTEGRAL GAIN 180 sec.
- 5.
DERIVATIVE GAIN 10 sec.
II. MAIN FEEDWATER EVENTS A.
Describe all events that resulted in a complete loss of main feedwater over the last three years of operation.
Include as a minimum the following information:
2 -
date, initiating event, power level, consequences (one paragraph description), and safety significance of event.
- 1.
Date:
12/27/76 Initiating Event:
Loss of suction to 11 SGFP Power Level:
18%
Consequences:
With the unit operating at lower power the only SGFP in service loss of suction pressure to the feed pump occurred and the unit tripped due to Steam Generator LOW LOW level.
Safety Significance:
None
- 2.
Date:
12/27/76 Initiating Event:
Loss of suction to 12 SFGP Power Level:
17%
Consequences:
With unit operating at low power and only one SGFP in service loss of suction pressure to the feed pump occurred and the unit tripped due to Steam Generator LOW LOW level.
Safety Significance:
None
.3.
Date:
8/13/77 Initiating Event:
SGFP trip in manual Power Level:
50%
Consequences:
With unit operating at approximately 50% due to feed pump control problems and only one feed pump in service feed pump manual control resulted in a feed pump trip and the unit tripped due to LOW feedwater flow.
Safety Significance:
None
- 4.
Date:
12/5/77 B.
Note Initiating Event:
Loss of suction to Condensate Pumps Power Level:
55%
Consequences:
With unit operating at 55% with all Condensate and Feed Pumps in service loss of two of the three running Condensate Pumps caused a loss of suction to both SGFP's and the unit tripped due to LOW LOW Steam Generator level.
Safety Significance:
None In explanation of the responses for SAFETY SIGNIFICANCE on all of the events listed it is noted the ECCS system was not automatically or manually initiated following these events.
The Auxiliary Feedwater System functioned normally following each of these events and Steam Generator level was restored to operating levels in a normal manner.
3 -
III. STEAM GENERATORS A.
Provide a schematic diagram of the Steam Generator (see Attachment 2)
B.
Identify important characteristics
- 1.
Steam Generators used at Salem Generating Station are Westinghouse Model 51.
- 2.
The Westinghouse Model 51 steam generator is a vertical shell and U-tube evaporator, with integral moisture separating equipment.
The Westinghouse steam generator is a saturated steam generator with a maximum moisture carryover of 0.25%.
The feedwater is in-jected via a J tube modified feed ring into the downcomer where it mixes with recircu-lated water and water removed by the moisture separators.
This makes up the total feed flow to the steam generator.
This model steam generator has 51,500 square feet of heat transfer area.
This heat transfer area is made up of 3,388 U-tubes that are 7/8 inches outside diameter with a.050 inch thick wall.
C.
Provide:
- 1.
Normal liquid level 44% span
- 2.
Normal volume 102,000 lbm
- 3.
Reactor trip low level 25% span Reactor trip volume 89,700 lbm
- 4.
MW 3,350
- 5.
Ba~is and span explanation Each steam generator is equipped with a f eedwater controller which maintains a pro-grammed water level as a function of load on the secondary side of the steam generator.
The feedwater controller regulates the feed-water valve by continuously comparing the feedwater flow signal, the water level signal, and the pressure compensated steam flow signal.
Continued delivery of feedwater to the steam generators is required as a sink for the heat stored and generated in the reactor coolant following a reactor trip and turbine trip.
An override signal closes the feedwater valves when the average coolant temperature is below 554°F.
CAB:hs 5/30/79 4 -
Following a turbine trip, the feedwater regulating valves are closed at approximately a uniform rate, decreasing flow to a low percent of full flow at about one minute after the trip.
This provides an optimum heat sink.
Subsequently, the operator remotely controls the valves to maintain steam generator water level.
Manual override of the feedwater control system is available at all times.
e ATTACHMENT 2 DEMISTERS SECONDARY MOISTURE SEPARATOR---
ORIRCE RINGS*--
SWIRL VANE PRIMARY MOISTURE SEPARATOR--..
FEEDWATER INLET---
WRAPPER-----./
TUBE SUPPORT PLATES--_,
SLOWDOWN LINE--
TUBE SHEET*----
PRIMARY MANWAY-----
---SECONDARY MANWAY
UPPER SHEU
FEEDWATER RING
TUBE BUNDLE
"'-----LOWER SHEU
--SECONDARY HANDHOLE
(/_
lUBE LANE BLOCK
~...-.;:_ /
?---.-__~RIMARY COOLANT OUTLET
. @ SERIES 51 STEAM GENERATOR NOT TO SCALE 9916