ML19329D611
| ML19329D611 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 07/12/1976 |
| From: | Novak T Office of Nuclear Reactor Regulation |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003160235 | |
| Download: ML19329D611 (8) | |
Text
'
04
- .p o.
e.
^
Gentral FilD RSB Reading
~~
NRR Reading Thor.as A. Ippolito, Chief, Electrical, Instrunentation and Control Systems Branch, DSS CRYSTAL RIVER 3 ECCS MODIFICATION 2
,?
c The enclosed materiaf submitted by' Florida Power Corporation (FPC).
~
in response to an inquiry on LOCA operating procedure indicates that automatic flow controllers are being added to their Decay Heat and Building Spray systens.
FFC's stated intent of the desien change is to preclude the need for operator action or ouerating procedures to control punp renout'.(which could result in insufficient pump suction head).
Your review of this design is invited and could be considered a follovup to your letter to me on CE-3 dated May 5, 197c.
(Also, iten 4.0 in the
~
Pfay 5th letter avaits resolutien). Your conclusions by August 1, 1976 would be apprealated.
Original signed by Thotuas M. Suvak Thonas M. Novak, Chief Reactor Systems Branch Division of Systems Safety
Enclosure:
As Stated cc:
D. Ross:
R. Tedesco J. Stolz Q
L. Engle.
g
\\)
S. Israel u
C. }bzetis i
4
- 3. Matt 1
d 8003160 f..
~
D QSE... _
. DSS:RSB.....
' or ic =
- eN Gda.n. sfdb iTNovak
/
04T5 >
4~
-- ~~*
form AEC.318 (Rev. 9 53) AIch! 0240
. W u. s. novsmanssNT paruvi ee orricts te74.sse-s ee
JUL 0 9 REG Informal ECCS Questions - Runout During the injection phase of ECCS following E.
S.
actuation the runout flow for the Decay Heat and Reactor Building Spray pumps is ultimately high and the limiting condition is that of insufficient discharge system head.
During the recirculation phase the runout flow for the Decay Heat and Reactor Building Spray pump is signifi-cantly less than for the injection phase and the limiting condition is that of NPSH.
In order to prevent runout or exceedance of NPSH margin available for both of these systems during either phase of operation, safetv-related autematic flow controllers will be added to the Decav Heat and R.B.
Sorav Svstems.
Runout or exceedance of the NPSH margin available by the Decay Heat pumps during the injection and recirculation phases will be prevented by discharge valve limit switch adjustment and by automatic flow controllers operating the throttle valves.
The limit switches on throttle valves DHV-110 and DHV-lll are adjusted such that the system is preset to deliver 3000 gpm at 100 psig Reactor Coolant pres-As the Reactor Coolant pressure decays the automatic sure.
3 flow controllers monitor the discharge flow of DHP-1A and DHP-1B and automatically throttle DHV-110 and DHV-lll as required to maintain the flow between 3000 and 3300 com dur-ing'both phases of operation.
For the Decay Heat System the automatic flow controller remains in operation following E.S. by pass and change over to the recirculation mode.
Similar safety related automatic flow controllers are i
provided for the Reactor Building Spray pumps to prevent runout or exceedance of NPSH margin available by throttling discharge valves BSV-3 and BSV-4 as necessary to accomadate the following two modes of operation:
(1)
With an E.S.
signal present (injection phase),
safety related flow switches activate the automatic flow controller which throttles BSV-3 & 4 as required to maintain the flow between 1500 and 1600 gpm.
(2)
When the E.S. signal is by passed following a LOCA (recirculation phase), a separate set of safety related flow switches activate the automatic flow controller which throttles BSV-3 & 4 as required to maintain the flow between 1150 and 1250 ccm.
A key switch in a locked cabinet is also provided to give I
the operator the flexibility of manually bypassing the automatic flow controller to allow operator control from the control room of DHV-110 and DHV-lll.
In addition, BSV-3 and BSV-4 can be manually controlled from the control rcom.
m
The flow set points for the automatic flow controllers and their respective alarm limits are in-cluded in Table 1 (attached).
The use of automatic flow controllers during the injection phase and the recirculation phase crecludes fltheneedforeneratoractionorcoeratinacroceduras I
to control pumn runout or the exceedance of NPSH marcin
,available for the Decay Heat &
R.B.
Sorav Svstems.
I However, Annunciator Alarm procedures (AP-102) are available to aid the operator in his response to alarms indicating high or low flow conditions in the Decay Heat or R.B.
Spray Systems.
These procedures list-specific inputs and/or set points to each annunicator window, probable cause for the alarm, symptoms indicated by the cause, automatic action associated with the alarm, and follow-up action to correct the~ problem.
Information concerning the accuracies of the outlet flow instrumentation and alarms for the R.B. Spray Pumps BSP-1A and BSP-1B and the Decay Heat Pumps DHP-1A and DHP-1B is included in Table 2 (attached).
It is our intent to test these systems to the mest complete and actual postulated E.S.
condition possible to insure that the automatic flow controllers maintain the flow to 'within the limits identified with Table 1.
l:
~
Table 1 Flow and Alar n Setooints Decay Heat System (GPM)
R.B. Soray System (GPM)
Runout Flow D. H. Pump:
4100 2000 Maximum Flow-based on NPSH margin
-during recirculation phase:
~ 3700
~ 1300 Alarm Setpoints:
Injection Phase High 3400 1700 Low 2800 1400 Recirculation Phase High 3400 1300 Low 2800 1100 Automatic Flow Con roller Setpoints:
Injection Phase High 3300 1600 Low 3000 1500' Recirculation Phase High 3300 1250 Low 3000 1150 f
w
+r c
-,y--
Table 2 Pump:
BSP-1A Outlet Flow Instrumentation and Alarms Primary Element:
BS-1-FEl (Local)
Bailey Meter Company 8" 304 SS Eccentric Orifice S/N 159315 Transmitter:
BS-1-0PTl (Local)
Bailey Meter Company BY-8240-A S/N 721866 Fluw Range: 0-1800 GPM From 300" H 0 Differential 2
Accuracy: + 1/2% of Range Output:
-10 to +10 VDC 4
Remote Indication:
BS-1-FIl ESF(A)
Item JQ Sailey Meter Company RY 120 X.
S/N 690102 Flow Range: 0-1800 GPM Scale Accuracy:
+ 1% of Span Input: -10 to +10 VOC Alarm Switch:
BS-1-FS1- (NNI CAB)
Bailey Meter Company Alarm Monitor 6683819-1 Range: 0-1800 GPM Injection Phase:
High Flow Alarm - 1700 GPM Low Flow Alarm - 1400 GPM i
Recirculation Phase:
High Flow Alarm - 1300 GPM Low Flow Alarm - 1100 GPM Accuracy: + 0.25" of Span Overall Accuracy:
+ 1. 14%
Table 2 (continued)
Pump: BSP-18 Outlet Flow Instrumentation and Alarms Primary Element:
BS-1-FE2 (Local)
Bailey Meter Company 8" 304 SS Eccentric Orifice S/N 159316 Transmitter:
BS-1-DPT2 (Local)
Bailey Meter Company BY-8420-A S/N 721867 Flow Range:
0-1800 GPM From 300" H20 Differential Accuracy: + 1/2% of Span Output:
-10 to +10 VDC Remote Indication:
BS-1-FI2 ESF(B) Item JQ)
Sailey Meter Company RY 120 X S/N 690103 Flow Range:
0-1800 GPM Scale Accuracy:
-+ 1% of Span Input:
-10 to +10 VDC I
Alarm Switch:
BS-1-FS2 (NNI CAB)
Bailey Meter Company Alarm Monitor 6623819-1 Range:
0-1800 GPM Injection Phase:
High Flow Alarm - 1700 GPM Low Flow Alarm - 1400 GPM Recirculation Phase:
High Flow Alarm - 1300 GPM Low Flow Alarm - 1100 GPM Accuracy:
+ 0.25% of Span Overall Accuracy:
+ 1.14%
1 v
r' ~~
Table 2 (continued)
Pump:
OHP-1A Outlet Flow Instrumentation and Alarms Primary Element:
DH-1-FEl (Local)
Bailey Meter Company 10" 304 SS Eccentric Orifice S/N 159331 Transmitter:
DH-1-DPTl (Local)
Bailey Meter Company BY-8240X-A S/N 721859 Flow Range:
0-5000 GPM From 573.9" H20 Differential Accuracy:
1 1/2% of Span Output: -10 to +10 VDC Remote Indication:
DH-1-FIl ESF(A)
Item KB Bailey Meter Company RY 120 X S/N 690093 Flow Range: 0-5000 GPM Linear Scale Accuracy: i 1% of Span Input: -10 to +10 VDC Alarm Switch:
DH-1-FS1 (NNI CAB)
Bailey Meter Company Alarm Monitor 6623819-1 Range:
0-5000 GPM Injection and Recirculation Phases:
High Flow Alarm - 3400 GPM Low Flow Alarm - 2800 GPM Accuracy: if 0.25% of Span Overall' Accuracy:
1 1.14%
OO
's Table 2 (continued)
Pump:
DHP-1B Outlet Flow Instrumentation and Alarms Primary Element:
DH-1-FE2 (Local)
Bailey Meter Company 10" 304 SS Eccentric Orifice S/N 159332 Transmitter:
DH-1-DPT2 (Local)
Bailey' Meter Company BY-8240X-A Flow Range:
0-5000 GPM From 573.9" H20 Differential Accuracy:
+ 1/2% of Span Outpbt:
-10 to +10 VDC Remote Indication:
DH-1-FI2 ESF(B)
Item KB Bailey Meter Company RY 120 X S/N 690094 Flow Range:
0-5000 GPit Linear Scale Accuracy: -+ 1% of Span Input:
-10 to +10 VDC Alarm Switch:
DH-1-FS2 (NNI CAB)
Bailey Meter Company Alarm Montior 6623819-1 Range: 0-5000 GPM Injection and Recirculation Phases:
High Flow Alarm - 3400 GPM Low Flow Alarm - 280C GPM Accuracy: 1 0.25% of Span Overall Accuracy:
1 1.14%
.l
.. _..