ML20066C815
| ML20066C815 | |
| Person / Time | |
|---|---|
| Site: | 05000605 |
| Issue date: | 01/09/1991 |
| From: | Torres W GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20066C783 | List: |
| References | |
| 23A6169AE, 23A6169AE-RA, NUDOCS 9101110236 | |
| Download: ML20066C815 (6) | |
Text
{{#Wiki_filter:_. ..__,.;_ .. _ _ . . _ _ . _ . - - _ _ _ - ~ _ _ __ - __ _ _. _ O V GE Nuclear Energy- > 23A6169AE =sH W 1 1 pgy A 1 REVislON STATUS SHEET ' DOCUMENT TITLE - LOP-6, UNIT SHLTTDOWN TO UNIT OFF-LINE. MAIN CONDENSER AVAILABLE i LEGEND OR DESchiPTION OF GROUPS TYPE: OPERATING PROCEDURE'- pyp: K6/7 < MPL ITEM NO: A8&3020 T REVISIONS 'l'- 1' A - PRELIMINARY ISSUE PER OAg E RM - DMH-3234 1
~!
- 765 -_
i
-I PRINTS TO MADE BY- APPROVALS DEPT LOCATION '
-W BTORRES C K TANO -- - GE NUCLEAR ENERGY- SAN JOSE -
J 4 CHKDBY ISSUED - - CONT ON SHEET 2 -
; O A BAYLIS :
F E WILHEMI i e 9101110236 910109 PDR ADOCK 05000605
- p PDR
GE Nuclear Energy ' AEV A TABLE OF CONTENTS RELA
- 1. SCOPE / APPLICABILITY 3
- 2. DISCUSSION 3 !
- 3. PRECAUTIONS AND LIMITATIONS 3
- 4. PREREQUISITES 3
- 5. PROCEDURE 4 5.1 General Procedure 4
, 5.2 Power Reduction to [20%) Power 4, 5.3 Power Reduction to (10%) Power 5 5.4 Generator Separation from the Grid 6
- 6. REFERENCES 6 k
1 G) GE Nuclear Energy 23A6169AE SH to; 3 REV A 1.0 SCOPE / APPLICABILITY This procedure provides the detailed instructions for performing and sequencing the various steps required to achieve a safe reactor shutdown from an operating power level of approximately [45%), utilizing the main condenser as a heat sink, including generator separation from the grid at approximately (10]% power. 1 2.0 DISCUSSION Unit shutdown from approximately [45%) power includes separation of the turbine generator from the grid. Further power reduction may be subsequently cor acted per IOP-8, " Unit Off-Une to Hot Standby or Hot Shutdown, 3.0 PRECAUTIONS AND LIMITATIONS 3.1 To prevent turbine overheating, low load operation of th's turbine generator should be restricted to greater than [70) MWE. 3.2 The correct control rod pattern must be established prior to decreasing reactor power to the RC&lS Low Power Setpoint of [later)
% thermal power.
3.3 As each control rod is fully inserted, verify that the FULL-IN Indication is operable. 4.0 PREREQUISITES 4.1 Reactor power has been reduced to approximately [45%) per
- IOP 4," Power Ascension and Power Changes".
! 4.2 The main turbine shaft lift pumps started and run for about [10] minutes to check their performance Refer to SOP-[later), " Main Turbine Lube Oil System". 4.3 The automatic-start feature of the main turbine tuming gear and main turbine tube oli pumps checked. [ This operation is normally conducted locally. Refer to SOP-[later),' Main Turbine Lube Oil
, System".
l 4.4 The proper control rod sequence selected for reactor shutdown. 4.5 Notify the Load Dispatcher of pending unit shutdown. l l l l l
9 .- O GE Nuclear Energy 23A6169AE SH NO . 4 REV -A 5.0 PROCEDURE 5.1 General Procedure : 5.1.1 As feedwater flow is decreased during the power reduction, remove individual condensate filter /demineralizers from service as hecessary to maintain (later2] differential pressure across the in service filter /demineralizers. 5.1.2 Maintain the turbine load setpoint (10%) above actual generator output as reactor power decreases. 5.1.3 Maintain'RPV water level and pressure within normal control band. 5.2 Reduction to (20%) Power . 5.1.1 initiate control rod insertions to reduce reactor power to (20%). During the power decrease, execute steps 5.2.2 through 5.2.4. NOTE l As each control rodis fully inserted, verify that the FULL-IN Indication is operable, l j 5.2.2 When reactor power has been decreased below [40%), verify that the following main steam line drain valves automatically open: B21 F171, Inboard Drain Solenoid Operated Valve B21 F221, Downstream Drain Solenoid Operated Valve to Cor. denser. 5.2.3 (Check that the Control Rod Pattem Controller will permit continued rod Insertion below the RC&IS Low Power Setpoint (later). lf necessary, increase reactor power by increasing recimulation pump speed to maintain reactor power above [30%) for rod pattem adjustments. )
t . 23/.6169AE SH KL 5
' ~
AW A 5.2 Reduction to [20%) Power (conunued) 5.2.4 When total feedwater flow decreases below ?S%, switch to Single-Element Control Mode in the Feedwater Control System. Confirm that RPV water level controlis stable. 5.2.5 At [20%) power, open (or check open) the following main t steam line drain valves: l
- Inboard Drain , B21 F152,
- Downstream Drain, B21 F211.
5.2.6 Remove one turbine driven reactor feedpump from service per 4 SOP-[later), "Feedwater and Condensate System". 5.2.7 Remove [ designated) heaters and [ check appropriate valve alignments), as follows: [ L A T E R , many steps missing ) 5.2.8 Switch house loads from in-plant power sources to external power sources per SOP-{later). 5.3 Power Reduction to [10%) Power 5.3.1 Continue to insert control rods in the prescribed sequence to decrease generator load and reactor power to approximately (10%). 5.3.2 Remove one LPCP and one HPCP from service, and place the motor-driven feedpurrp into operation. Stop the remaining turbine-driven feedpump. 5.3.3 Align CUW return flow to one feedwater line and isolate the other feedwater I!ne to feed the vessel with one feedwater line in accordance with SOP _-821, " Nuclear Boller System". l l y
& GE Nuclear Energy 23A6169AE MV- A St1 NO 6 5.4 Generator Separation from the Grid <
5.4.1 Notify the Load Dispatcher that unit is periding removal from ' his system. 5.4.2 Shutdown the Main Turbine Generator per SOP-[later), ." Main Turbine Generator System". 5.4.3 Isolate steam to the first stage reheaters as follows:[ _LATER) 5.4.4' Remove Bus Duct Cooling System from service per SOP-later. 5.4.5 Verify that the turbine bypass valves are controlling pressure. .l 5.4.6 [Open various MS/R and turbine and miscellaneous drain'. valves,~ !ater). 5.5 Continue power reduction in accordance with IOP-8, " Unit Off-Line - to Hot Standby or Hot Snudown".
6.0 REFERENCES
None. i k i
,}}