ML20039D572
| ML20039D572 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 12/16/1981 |
| From: | Sheep J, Woodward H SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | |
| Shared Package | |
| ML20039D570 | List: |
| References | |
| EOP-15, NUDOCS 8201050221 | |
| Download: ML20039D572 (11) | |
Text
_ _ _ _ _ _
SOUTH CAROLINA ELECTRIC AND GAS COMPANY VIRGIL C. SU'4MER NUCLEAR STATION NUCLEAR OPERATIONS 00PY EMERGENCY OPERATING PROCEDURE E0P-15 REACTLR VESSEL VENTING REVISION O DECEMBER 16, 1981 7
SAFETY RELATED
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Reviewed by:
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Date iSS2.MGa,OeEnATg REVIEWED BY PSRC
~2 Date Issuea: DEC 2 91981
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7g[{ f Form AP-101-2 (1/80)
CHAIRMAN _ ___ _ _ _
DATE 8201050221$00 5
V0P-15 PAGE i REVISI0ti 0 12/16/81 LIST OF EFFECTIVE PAGES PAGE REVISION i
0 1
0 2
0 3
0 4
0 5
0 5
0 7
0 ATTACHMENTS Attachment I O
Attachment II O
y M
E0P-15 REVISICN O 12/16/81 1.0 PURPOSE 1.1 This procedure provides operating guidelines for the removal of gaseous voids from the reactor vessel head by means of the pressurizer level & pressure control system or the reactor vessel head vent system.
1.2 This procedure is not intended to be used as part of the reactor coolant system fill and vent procedure or as a primary means to mitigate an inadequate core cooling event.
13 This procedure assumes the gaseous voids were formed during an unusual plant condition such as safety injection or a too rapid cooldown with either forced flow or natural circulation flow.
2.0 REFERENCES
AND GLOSSARY 2.1 heferences 2.1.1 Westinghouse Owners Group Reactor Vessel Head Vent Guidelines.
2.1.2 V.C.
Summer Nuclear Station FSAR, Section 5 5 15 2.2 Glossary 2.2.1 PRT - Pressurizer Relle%. Tank 2.2.2 RCP - Reactor Coolant Pump 2.2.3 RCS - Reactor Coolant System 30 SYMPTOMS 31 Reactor Vessel Level indications (Primary Symptom).
3 1.1 With RCP's operating (one or more).
A.
Wide Range Level: 1 100% 1 4.2% and decreasing.
3 1.2 With no RCP's running.
A.
Upper Plenum Level:
1 100% i 4.2% and decr's"ing OR B.
Narrow Range Level:
1 100% 1 4.2% and decreasing OR C.
Wide Range Level:
533%14.2% and decreasing PAGE 1 0F 7
EOP-15 REVISION 0 12/16/81 32 Reactor Core Cooling indication: < 0 F subcooling.
33 Pressurizer level increase during pressurizer pressure decrease.
4.0 AUTOMATIC ACTIONS 4.1 None 50 IMMEDIATE OPERATOR ACTION 51 None 6.0 FOLLOWUP OPERATOR dCTION CAUTION Do not stop an running OR start any non-operating RCP's during the performance of the following actions.
6.1 Reactor vessel venting without safety injection.
6.1.1 Es tablish steady-state RCS temperature and pressure conditions.
6.1.2 Recombine any condensable gases in the reactor vessel as follows:
A.
Place PZR LEVEL MASTER CONTROL in MANUAL.
B.
START all pressurizer heater groups.
C.
Increase charging flow to maintain pressurizer level; with the PZR LEVEL MASTER CONTROL.
CAUTION If pressurizer level decreases to < 20% complete steps D, E, and F as necessary.
If level is maintained skip to step G.
D.
De-energize pressurizer heaters.
PAGE 2 0F 7 i
E0P-15 REVISION O 12/16/81 E.
Isolate RCS letdown.
F.
If pressurizer level continues to decrease initiate safety injection and go to E0P-1.
G.
If reactor vessel level is restored to normal conditions return to normal operating procedures.
H.
If reactor vessel level still indicates abnormal levels, continue these instructions.
6.1 3 Verify Reactor Building Purge Systems are isolated.
6.1.4 START all Reactor Building Cooling Units in NORM.
6.1 5 Increase RCS subcooling to 2 50 F by either:
A.
Increasing pressurizer pressure OR B.
Dumping Steam fror. the steam generators to the condenser cc atmosphere.
.. w 6.1.6 Isolate or verify RCS Letdown Isolation.
6.17 Increase pressurizer level to 2 50% by use of PZR LEVEL MASTER CONTROL.
6.1.8 Unlock and close Motor Control Center breakers for the head vent valves.
6.1 9 Open the Reactor Head Vent valves in one flow path.
A.
MVT-8095A and MVT-8096B OR B.
KVT-8095B and MVT-8096A.
NOTE l
If one or both valves in the vent path fail to open, close both valves and open the valves in the parallel flow path.
PAGE 3 0F 7
E0P-15 REVISION 0 12/16/81 6.1.10 Increase charging flow to maximum.
6.1.11 Monitor pressurizer level during the venting to determine the probable status of the RCS.
A.
Increasing Level - Gaseous voids exist in the RCS other than the pressurizer or reactor vessel.
B.
Constant Level - No significant voids exist in the RCS.
C.
Decreasing Level - Gaseous voids exist in the reactor vessel.
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6.1.12 CLOSE both REACTOR HEAD VENT valves when:
A.
Reactor vessel level indication stabilizes at normal level QR B.
Pressurizer pressure decreases by 200 psi; OR C.
Pressurizer level decreases to < 20%
OR D.
RCS Subcooling decreases to < 0 F OR E.
PRT level increases,Lo 80%
OR P.
PRT pressure increases to 80 psig 6.1.13 Reestablish normal charging and letdown flows to maintain pressurizer in the operating range.
6.1.14 Evaluate symptoms to determine if a gaseous void still exists in the reactor vessel.
6.1.15 If venting operation was stopped due to PRT level or pressure limits.
A.
Cool the PRT as per SOP-101, Section 5 2.
B.
Vent the PRT as per SOP-101, Section 5 7 PAGE 4 0F 7
EOP-15 REVISION 0 12/16/81 C.
Drain the PRT as per SOP-108, Section 5 27 5.1.16 If a gaseous void still exist in the reactor vessel, repeat step 6 5 through 6.1.13 as necessary.
6.1.17 When reactor vessel level is restored to normal indications return to normal operating procecures.
6.1.18 open and lock motor control center breakers for Head Vent Valves.
6.2 Reactor Vessel Venting with safety injection.
NOTE This procedure should be implemented after safety injection has established as close to steady state RCS conditions as possible and prior to post safety injection cooldown and j
depressurization.
[
6.2.1 Verify pressurizer level has recovered to > 50% as indicated on LI-459A, LI-460, or LI-461.
~
y 6.2.2 Verify RCS Subcooling if > 50 F as indicated on TI-499A, B,
C, or D.
If not A.
Attempt to cool the RCS by dumping steam from the non-faulted steam generators to the condenser or atmosphere OR B.
Increase RCS pressure by use of the pressurizer heaters.
6.2 3 If the PRT rupture disk is not intact. complete Attachment I.
6.2.4 Unlock and close Motor Control Center breakers for the Reactor Head Vent Valves.
O PAGE 5 0F 7
E0P-15 REVISION 0 12/16/81 6.2 5 Open the REACTOR HEAD VENT valves in one flow path.
A.
MVT-8095A and MVT-8096B OR B.
MVT-8095B and MVT-8096A.
NOTE If one or both valves in the vent path fails to open close both valves and open the valves in the parallel flow path.
6.2.6 Monitor pressurizer level during the venting to determine the probable status of the RCS..
A.
Increasing Level - Gaseous voids exist in the RCS other than the pressurizer or reactor vessel.
B.
Constant Level - No significant voids exist in the RCS.
C.
Decreasing Level - Gaseous voids exist in the reactor vessel.
6.2.7 Close the REACTOR HEAD VENT valves when:
y A.
Reactor Vessel indications stabilizes at normal level SE B.
Pressurizer pressure decreases by 200 psi OR C.
Pressurizer level decreases to < 20% OR D.
RCS subcooling decreases to < 0 F OR E.
PRT level increases to 80%
OR F.
PRT pressure increases to 80 psig OR G.
Venting time determine in 6.2 3 is met.
PAGE 6 0F 7 I
E0P-15 REVISION 0 12/16/81 6.2.8 Evaluate symptoms to determine if gaseous voids still exist in the reactor vessel.
6.2.9 If venting operation was stopped due to PRT pressure or level limits.
A.
Cool the PRT as per SOP-101, Secti.on 5 2.
B.
Vent the PRT as per SOP-101, Section 5 7 C.
Drain the PP.T as per SOP-108, Section 5 27 NOTE PRT operations will reouire resetting the SI signal.
6.2.10 If gaseous void still exists in the reactor vessel, repeat step 6.2.1 through 6.2.8.
6.2.11 When reactor vessel level is returned to normal indications return to appropriate operating procedures.
6.2.12 Open and lock motor control center breakers for head vent valves.
y 7.0 FINAL CONDITIONS 71 Reactor vessel level has been restcred to normal level indications.
PAGE 7 0F 7
EOP-15 ATTACHMENT I PAGE 1 OF 1 REVISION 0 REACTOR VESSEL HEAD VENT VENTING TIME 1.
Record:
a.
RB Temp TI-9201A F
b.
RB Temp TI-9203A F
c.
RB H2 Conc CI-8257
%H2 d.
RB H2 Conc CI-8258
%H2 e.
WR RCS Press PI-403 PSIG (Use highest readings for calculation) 2.
Calculate reactor building free volume (STP)
RB Volume 'STP) = 1.842 x 106 cu. ft.'x 492 R RB Temp + 460
= 1.842 x 106x 492
=
cu. ft.
+ 460 3
Calculate maximum H2 volume that can be vented Max H2 Volume = (3 0% - RB H Cone) x RB Volume (STP) 100
=
cu. ft.
(3 0 -
) x(
)
=
p,-
SCFM 4.
From curve determine H2 Flow Rate
=
5 Calculate venting time minutes Venting Time = Max H2 Volume
=
H2 Flow Rate
-[
ATTACHMENT II PAGE 1'.0F~12:
REVISION 0 I
2000
/
(
/
1500 RCS PRESS.
(PSI)
. Wl 1000 f
f J
/
/
/
500 7
1000 2000 3000 4000 5000 HYDROCEN FLOW RATE (SCFM)