ML20003F496
| ML20003F496 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 04/15/1981 |
| From: | MISSISSIPPI POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20003F494 | List:
|
| References | |
| 05-S-01-EP-5, 5-S-1-EP-5, NUDOCS 8104210411 | |
| Download: ML20003F496 (10) | |
Text
.
C-RAND GU:.F NUCLEAR STATICN EXERGENCi ROCEDUR.
T s
PLANT OPERATIONS MANUAL I
Volume 5 05-S-01-EP-5 Section 1 Revision C Date:
4 EMERGENCY PROCEDURE RAPID RPV DEPRESSURIZATION SAFETY RELATED 1
. Prepared:
Date Reviewed:
Date Technical Review Reviewed:
Date Operations Superintenden Date Reviewed:
Nuclear Plant Quality Supertntendent Approved:
Date Assistant Plant Manager PSRC:
Date List of Effective Pages:
Page:
Revision:
1-4 Rev.
C Attachment I Rev.
C g i 0 4 210W'*
3 RAND GU!F N'JC'E',2. STATICN E.MERGENCY PRCCIDURE EiTLE:
Rapid RPV Depressuri=ation NO. 05-5-01-EP-5 REV. C PAGE 1 cd 4 j
4 1.0
-PURPOSE The purpose of this procedure is to rapidly depressurize the RPV to allow injection systems to inject and restore RPV water level to an acceptable level above TAF.
2.0 ENTRY CONDITIONS This procedure is cntered from the following Emergency Procedures:
2.1 EP-3 (Containment Control) when:
_/_7 2.l.1 Suppression Pool temperature and RPV pressure cannot be restored or maintained below the heat capacity temperature limit.
(EP-3 step 3.3.7).
4:7 2.1.2 Drywell temperature near the cold reference leg instrument vertical runs has increased to the RPV saturation limit (EP-3 step 3.2.3) o
--//--
2.1.3 Drywell temperature 'cannot be maintained below 330 F (EP-3 step 3.2.5).
_/_7 2.1.4 Containment pressure canot be maintained below 15 psig (EP-3 step 3.1.6)
~
--/7 2.1.5 Suceression Pool Water level cannot be maintained above the he'at capacity level limit (EP-3 step 3.4.5) 47 2.1.s Centainment temperature cannot be mainnained below 105 r (EP-3 step 3.5.4).
2.2 EP-4 (Level Restoration) when:
--/7 2.2.1 RPV water level cannot be determined but at least one injection or alternate injection subsystem is lined up with at least one pump running (EP-4 paragraph 3.3).
[ 7 -2.2.2 RPV water level is increasing, RPV pressure is between 50 psig and 500 psig and is increasing, and RCIC is not available (EP-4 step 3.5.2.a)
((7 2.2.3 RPV water level is increasing, RPV pressure is less than 50 ps:
and RPV pressure is increasing (EP-4 step 3.5.3) f_/
2.2.4 RPV water level is not increasing. RPV pressure is greater than 50 psig, CRD isnot operating but at least two injection subsystems are lined up for injections with pumps running (EP-4 step 3.5.4.c)
GRAfiD GUi? NUCLEAR STATICN EMERGENCY PROCECCRE kITLE: Rapid RPV Depressurization NO.05-5-01-EP-5 REV C 2 AGE of 4 2
~/7 2.2.5 RPV water level is not increasing RPV pressure is less than 50 psig any injection or alternate injection subsystem is lined up with pumps running and RPV pressure is increasing (EP-4 step 3. 5. 5.a).
f[/
2.3 EP-6 (Core Cooling Without Injection) when low pressure injection subsystems (or alternate injection subsystems) are lined up for injection with at least one pump running (EP-6 paragraph 3.3) 3.0 OPERATOR ACTIONS CAUTION a.
Do not depressurize the RPV below 50 psig (RCIC low pressure isolation setpoint) unless motor driven pumps sufficent to main-tain RPV water level are running add'available for injection.
NOTE
~
Cooldcwn rates greater than 100 F/hr may be attained during rapid RPV depressurization, f]7 3..
Open all ADS valves.
((7 3.2 Maintain suppression pool water level greater than 14 '6" in order to maintain NPSE requirements for pumps taking a suction from the suppression pool, with the following temperature limitations:
PUMPS MAXIMUM SUPPRESSION POOL TEMP i
EPCS, LPCS, RER 212 F RCIC 140 F i
l l/7 3.3 If not all ADS valves can be opened, then open other SRV's until a
~
l total of S SRV's are open.
l ll ((7 3.4 Maintain gr'ater than 50 psig RPV pressure unless moter driven pumps I
sufficient to maintain RPV level are running and available for in-l jection as determined by the following sequence:
4]7 a.
Observe RPV water level indication to determine indicated level.
f:7 b.
Close RcIC injection valve E51-r013.
f:7 c.
Observe RPV water level and attempt to maintain RPV water level with the motor driven injection pumps which are running.
t
[]7 d.
I# RPV water level cannot be maintained with the RCIC injection valve E51-F013 closed, then open E51-F013.
GR.AND GULF NUCLEAR STATION EMERGENCY PROCEDURE e
r-g Rapid RPV Depressurization NO. 05-5-01-EP-5 REV.
PAGE 3 cf 4 C
9 4
/7 e.
If RPV water level can be maintained with the RCIC injection valve E51-F013 closed, then RCIC can be shutdown and the RPV
~
pressure can be decreased to less than 50 psig.
NOTE SOI nt=bers and available pressure ranges are indicated for each syste:
NOTE The systems listed in paragraph 3.5 are listed in order of expected availability and effectiveness. The choice of using the listed systems may vary with plant conditions and with mnimizing radioactive release to the environment.
NOTE Defeating isolation interlocks may be required to complete
. paragraph 3.5.
-/7 3.5 If less than three SRV's can be. opened, then rapidly depressurice the RPV using the minimum number of systems required to depressurize to the point that RPV water level is increasing using the following systems:
O 3.5.1 Main--Condenser (preferred method)
O 3.5.2 RHR (Steam Condensing Mode)(.04-1-01-E12-1 at step later)
(1103 - O psig)
O 3.5.3 Steam Seal Generator (04-1-01-N33-1 at step later) (1103 - 150 psig O
3.5.4 Off Gas preheater (04-1-01-N64-1) (1103-150 psig)
O 3.5.5 SJAE's (04-1-01-N62-1) (1103 - 200 psig)
/__/
3.5.6 RFPT's (04-1-01-N21-1) (1103 - 350 psig)
O 3.5.7 RWCU (Recirculation mode)( 04-1-01-G33-1) (1103 - O psig)
O 3.5.8 Main Steam Line drains (04-1-01-Nil-1) (1103 - O psig)
O 3.5.9 RUCU (blowdown mode) (04-1-01-G33-1) (1103 - O psig)
O 3.5.10 RCIC Steam line (04-1-01-E51-1) (1103 50 psig)
O 3.5.11 Reactor Head Vent O
3.6 If, RPV water level cannot be determined then proceed to EP-9 (RPV Floodug).
f DCirE Contairrtent spray will initiate aut=natically at 9 psig.
l6 3.7 M centair ent pressure reaches 7.5 psig, then divert LPCI Pump A flow to the centauraent spray rrede for a period of time sufficient to reduce coreht pressure to 5 psig.
l I
-,ny c.--
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hTLE:
Rapid RPV Depressurization No.05-S-01-EP-5 nEv. C pact 4 c5 4
/7 3.2 If Containment pressure cannot bc maintained below 15 n. sic., then proceed to EP-9 (RPV Flooding).
O 3.9 I' temperature near the cold reference leg instrument vertical rcns reaches the RPV saturation limit as determined from the Figure A then proceed to EP-9 (RPV Flooding) t 553
- N N.
3 V
N
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APV. sa t ration j**
N limic 227 N
a P*1 SAFC 2_ : 3
.=1
- 12 o
APW Pressure (asig) 1C00 FIGURE A i
/7 3.10 If the Suppression Pool water level is less than 16'.1" then initiate SPMS at the following location:
3.10.1 P870 - Sect'.ons 4 and 10 - E30-LR-R600A and B 3.10.2 P870 - Sections 4 and 10 - Manual Initiate Pushbuttons O
3.11 M the following three conditions are met:
(1) Temperature near the cold reference leg instrument vertical runs is less than the RPV saturation limit as determined by Figure A, and (2) Containment pressure is maintained less than 15 psig and (3) RPV water level can be determined, then enter EP-1 (Ie/el Control) at paragraph 3.3.
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