ML20040B672
| ML20040B672 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 01/22/1982 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| IEB-80-18, NUDOCS 8201260305 | |
| Download: ML20040B672 (10) | |
Text
..
SOUTH CAROLINA ELECTRIC 8 GAS COMPANY x
7
-N 7
Ng ro.1 or r,cc.o 7 4 CotuMe:A, south CARollNA 29218 s
T C. N:cHots,Ja.
January 22, 1982
- [
Mct Persipt=f aseo Gnoop [attutwt 1
g q
Nuc'tcan Opspaticses
~,__
,?+L Mr. Harold R. Denton, Director
'[
~ j
.e
(( O<V Office of Nuclear Reactor Regulation
,qN U. S. Nuclear Regulatory Cannission T/
N Washington, D. C.
20555 l
Subject:
Virgil C. Sunmer Nuclear Station Docket No. 50/395 i
Charging Pump Miniflow Modification
Dear Mr. Denton:
South Carolina Electric and Gas @mpany (SCE&G) provides the i
following narked up FSAR pages (to be included in ESAR Amendment 29) which provides the " interim fix" for the accident discussed in IEB 80-18 " Maintenance of Adequate Minimum Flow Through Centrifugal Charging Pumps Ebllowing Secondary Side liigh Energy Line Ruptnre" and in the substantial safety hazard reprted to Mr. J. P. O'Reilly in our letter dated June 13, 1980, and December 19, 1980.
Investigation of the " lory term" solution is still in progress.
'1he implenentation of this fix is in progress and will be completed prior to fuel load. By copy of this letter, NRC Region II is informed that this letter is the final report for open item
}
(80-29-01).
If you have any questions, please let us know.
Very truly yours,
/
(
T. C. Nichols, Jr.
RBC:'ICN:Ikb Attachment cc:
V. C. Sunmer J. L. Skolds l
T. C. Nichols, Jr.
J. B. Knotts, Jr.
G. II. Fischer B. A. Bursey l
II. N. Cyrus J. C. Ruoff a
- 11. T. Babb J. P. O'Reilly D
D. A. Nauman O. W. Dixon M. B. M11 taker, Jr.
Site QA
)
l W. A. Williams, Jr.
II. Radin O. S. Bradham I&E Washington l
R. B. Clary Document Managenent Branch M. N. Browne
- (55e, 21, LER only)
A. R. Koon NPCF
{
G. J. Braddick File 8201260305 820122 PDR ADOCK 05000395 A
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to take suction from the refueling water storage tank during injection.
During recirculation, suction is provided by the residual heat removal pumps.
~
These pumps deliver flow through the boron injection tank to the RCS
?
at the prevailing RCS pressure.
Each centrifugal charging pump is a multistage diffuser design, barrel-type casing with vertical suction
~ ~
~
and discharge nozzles.
The pump is driven through a. speed increaser connected to an induction motor. 'The unit has a self contained lubri-cation system which is cooled by component cooling water and a self contained mechanical seal cooling system.
~
A minimum flow bypass line is provided ca each pump discharge to recir-culate flow to the pump suction af ter cooling via the ser21 water heat exchanger during normal plant opcration.
Each minimum flow bypass line I
is clots / dahf f Swift h0W 4t** *) *' r!*
- f* r*C'rCV'D'%
contains a xalve which I
-n I m
~f-.,.mj-imm ~;..d.
The common minimum flow bypass line also contains a valve which ;..cx ;rud 27 y clo durws swMk ovv-$ecm p3senou % n'trsal'. ram k r ~ fan wjeeri,a.ripa) m cccip f
m em % Au.p m :-
-...1.
""- i : P ' " ^r closes the k
valves to isolate the normal charging line and volume control tank and opens the charging pump / refueling water storage tank suction valves to align the high head portion of the ECCS for injection.
During normal plant operation, at least one charging pump is continuously in service.
The other charging pumps may be tested during power operation via the minimum flow bypass lines.
A punp performance curve is given in Figure 6.3-4.
(
6.3.2.2.4.3 Boron Injection Recirculation Pumpc These pumps are provided to recirculate the nominal 12 weight percent
]
concentrated boric acid solution continuously around a closed loop 7
(
consisting of the boron injection tank, the boron injection surge tank and associated piping.
One pump is in continuous operation while the other provides a maintenance spare.
The pumps are automatically stopped on receipt of a safety injection signal.
a,..a.s 6.3-7 Ja**rV, M S 2-
Failure to complete repairs within the designated time interval 3.
af ter going to hot shutdown is considered indicative of a require-ment for major maintenance and therefore the reactor is put in the cold shutdown condition.
C The injection mode of emergency core cooling is initiated by the safety injection signal. This signal is actuated by any of the following:
g 1.
Low pressurizer pressure 2.
High reactor building pressure 3.
High differential pressure between any two steam lines 4
Low Steam line pressure 18 5.
Manual actuation
'(
R Operation of the ECCS during the injection mode is completely automatic.
The safety injection signal automatically initiates the following actions:
1.
Starts the emergency diesel generators, which if all other sources o'f power are lost, supplies the engineered safety 2.
feature buses.
2.
Starts the charging pumps and the residual heat removal pumps.
3.
Aligns'the charging pumps for injection by:
-e.
01;cin;; th: cal.cs iu i. im ui= %ius pump minimum u.u liou.
l21 NN#
6.3-15 AFR1L r1980 siwary, (9 f b
Q M Closing the valves in the charging pump discharge line to the normal charging line.
b /.
Opening the valves in the charging pumps suction line from the refueling water storage tank.
N C4 Closing the valves in the charging pump normal suction line from the volume control tank.
2A d /.
Closing the valves in the boron injection tank recirculation.
lines.
6 (.
Opening the boron injection tank inlet and discharge line isolation valves.
{ g Stopping the boron injection recirculation pumps.
Remotely operated valves for the injection mode which are under. manual control (i.e., valves which normally are in their ready position and do not require a safety injection signal) have their positions indicated on a common portion of the control board.
If a component is out of its proper position, its monitor. light will indicate this on the. control board. At any time during operation when one of these valves is not in the ready position for injection, this condition is alarmed and shown visually on the board.
Process instrumentation available to the operator in the control room to provide him with appropriate and useful information during the automatic injection mode of operation are listed in Section 7.5.
The injection mode continues until the residual heat removal pumps have been realigned to the recirculation mode.
During the injection mode all k'
pumps take suction from the refueling water storage tank until a lo lo level signal from the refueling water storage tank aligns the residual heat removal pumps to take suction from the reactor building sump.. This G
Ansad nsur 2 9 6.3-16 3 um,.
iqy t
TABLE 6.3-3 SEQUENCE OF SWITCHOVER OPERATION FROM INJECTION TO RECIRCULATION The following manual operator actions are required to complete the switchover operation from the injection mode to the recirculation mode.
During the injection mode, the operator verifies that all ECCS pumps are operating and monitors the RWST and reactor building recirculation sump levels in anticipation of switchover. The operator opens, or verifies open, the component cooling water inlet isolation valves to the residual heat removal heat exchanger prior to switchover initietion. Upon receipt of the RWST "le-lo" level signal in conjunction with the safety injection signal, the reactor building recirculation sump isolation valves l
14 (3004 A & B, 3005 A & B, 8811 A & B and 8812 A & B) automatically open.
l 19 Following this automatic action, the operator is required to initiate the following manual actions to complete switchover.
The following manual actions must be completed in a timely manner fol-7(
loving switchover initiation to align the charging pumps suction to the v
residual heat removal pumps discharge.
l.
Verify that the reactor building recirculation sump isolation valves 14 (3004 A & B, 3005 A & B, 8811 A & B and 8812 A & B) are open and close the residual heat removal, pump suction valves (8809 A & B) 1@
and the reactor building spray pump suction valves (3001 A & B) from the refueling water storage tank.
2.
Close the valves (8887 A & B) in the crossover line downstream of 5-the residual heat removal heat exchanger. ) in th e Ch*t3'n3 Puk$
S.
Close the %(ve.s
( 8t %, 8t0 9 A, b A C i
Nini(loa firs C.
19
[ [ Open residual heat removal pump discharge valves (8706 A & B) to the 14 y
' suction of the charging pumps.
13:
v 29 6.3-52 AMENDMENT IS 6,u t
.n.
7,
,3 O
-N
,O O
AMEND O &l7 O
A: =,.:78 Tu ve y,I f I L TABLE 6.3-7 (Continued)
SINGLE ACTIVE FAILURE ANALYSIS FOR EMERGENCY CORE COOLING SYSTEM COMPONE!frS SHORT TERM PHASE (Cont'd)
Component Malfunction Comments b.
Centrifugal Charging Pumps i.
Suction line from refueling Fails to open Two parallel lines; only one valve water storage tank in either line required to open.
Y 11.
Discharge line to the Fails to close Two valves in series; only one normal charging path valve required to close.
non %h i+*y iii.
Hidimum flow bypass line Fails to close One valve in each of three parallel lines g
backed up by one valve in common line.
On pig e 11 Only three parallel valves or one common 3
g valve required to close.
(({
Jyr Suction from volume control Fails to close Two valves in series; only one, tank valve required to close.
c.
Residual Heat Removal Pumps i.
Minimum flow bypass line Fails to close Partial loss of max,imum flow from 5
one of two pumps., Evaluation based on flow from only one pump.
N r-n R
,Q p
,n TABLE 6.3-7 (Continued)
[~
SINGLE ACTIVE FAILURE ANALYSIS FOR EMERGENCY CORE COOLING SYSTEM COMPONENTS LONG TERM PilASE Component.
Malfunction Comments 1.
Valves Operated Manually from the Control Room a.
Residual heat removal pumps Fails to close Check valve in series with two parallel 7
suction line to refueling gate valves. Operation of either the Y
water storage tank check valve or the gate valves required.
lS b.
Centrifugal charging pump Fails to close Check valve in series with two Isuction line from refueling parallel gate valves. Operation water storage tank of either the check valve or D SER1-A + fj the gate valves requircd.
fr.n pay G,3-Gl c.
Residual heat removal-Fails to open Two parallel lines, with two valves in pumps suction line from series in each line, one pair of valves reactor building sump in either line is required to open.
d.
Centrifugal charging /high Fails to open One line provided from discharge of each head pump suction line at residual: heat. removal pump, valve in only discharge of residual heat one required to open.
exchanger
_ _ = _
A.
A p
n, NOTES TO FIGURE 6.3-2 (CONT'D,)
(Sheet 4 of 4)
N{ENDMENT 1 ET 6
%...y,offL VALVE ALIGNMENT FOR PRINCIPLE MODES OF ECCS OPERATION A
B C
D E
F G
Valve Normal Inj ection Inj ection Cold Leg Cold Leg Recir-Hot Leg Hot Leg Recir-No Standby Maximum Minimum Recirculation culation Mini-Recirculation culation Mini-Safeguards Safeguards Maximum mum Safeguards Maximum num Safeguards (Train A Only)
Safeguards (Train A Only)
Safeguards (Train A Only) i 18B 0
0 0
C O
C 0
-19A 0
-e- 0 0
C 0
C O
19B 0
-G- 0 0
C O
C 0
27
- 19C 0
-G-- 0 0
C 0
C 0
_ 20 0
-C-O
-C O C
C C
C 21A 0
C C
C C
C C
21B 0
C 0
C 0
C 0
22A C
0 0
0 0
C C
22B C
0 C
0 C
C C
23A C
0 0
0 0
C C
23B C
O C
0 C
C C
24 C
C C
C C
0 C'
25 C
C C
C C
0 0
26 C
C C
O C
C C
27A 0
C C
C C
C C
27B 0
C 0
C 0
C 0
28 0'
C C
C C
C C
29A 0
0 0
0 0
0 0
29B 0
0 0
0 0
0 0
29C 0
0 0
0 0
0 0
.