ML20247N401
| ML20247N401 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/20/1989 |
| From: | Gwinn R PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | |
| Shared Package | |
| ML20247N354 | List: |
| References | |
| FOIA-89-309 1-ST-22, NUDOCS 8909260213 | |
| Download: ML20247N401 (42) | |
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l0 ' Appendix B." STPD--Rev. 2
- Form 1
'SEABROOK STATION Startup Test Procedure 1 -ST- 22 Rev. 2
Title:
NATURAL CIRCULATION TEST.
' Prepared by: R. A. Gwinn Date: S/20/99 DETERMINATION OF 10CFR50.59 APPLICABILITY:
1.; Does-this procedure or revision: .
-i.
- a. Make' changes in the facility as described R Yes lXINo' in'the FSAR?
- b. Make changes-in procedures as described R ies lXlNo cin~the FSAR?
- c. Involve tests or. experiments not described L_J -Yes I X I No
.in the FSAR?
- d. Involve' changes to the existing Operating l IYes [XlNo License or require additional license requirements?
- 2. If any of the above questions are answered yes, a safety evaluation per NHY Procedure 11210 is required.
Approval Recommended by: '
du _
Startup' Manager 3/p//gV
' D&te Approved: -
tj ld '9 Statiorn an r Date sottc. u N-53 l 8909260213 890919 j PDR FOIA BROCKB9-309 PDR
U.-
U .1-ST-22 Rev. 2-
- t. Page 1 of:12' SEABROOK STATION i
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STARTUP TEST PROCEDURE 1-ST NATURAL CIRCULATION TEST Prepared by: R. A. Gwinn SECTION TITLE PAGE' 1.0 OBJECTIVE 2
2.0 REFERENCES
2 3.0 - PREREQUISITES '2 4.0 SPECIAL PRECAUTIONS 3
- 5. 0 INITIAL CONDITIONS 4 6.0 TEST INSTRUCTIONS 5 7.0 FINAL CONDITIONS 12 8.0 ACCEPTANCE CRITERIA 12 9.0 ATTACHMENTS 12
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1-ST-22 Rev. 2 Page 2 of 12 1.0 OBJECTIVE 1
This test will determine several natural circulation characteristics and will demonstrate the ability to remove heat from the reactor coolant system using natural circulation. The characteristics to be determined include: time necessary to stabilize natural circulation; reactor coolant flow distribution; depressurization rate following loss of pressurizer heaters; depressurization rate using auxiliary spray; effect of charging flow and steam flow on subcooling margin; subcooling monitor performance.
2.0 REFERENCES
CURRENT NO. TITLE REVISION REVISION 2.1 1-ST-1, Startup Program Administration 2 2.2 Seabrook Station Technical Specifications Amend 1 Precautions. Limitations and Setpoints for 2.3 the Westinghouse NSSS 2 Seabrook Station FSAR, RAI Response 2.4 640.51-4t 56 2.5 ES-0.2, Natural Circulation Cooldown 6 2.6 ASME Steam Tables 5th Ed.
Seabrook Station FSAR, Table 14.2-5, 2.7 Item 22 Amend 61 2.8 Startup Test Program Description 2 INITIALS /DATE M
3.0 PREREQUISITES
/ 3.1 The test director has reviewed the latest revisions of the applicable references to determine if any system changes that have been made will affect the test performance.
/ 3.2 Personnel involved with the performance of this prccedure have been briefed on the procedure content and informed of their respective duties.
/ 3.3 The Temporary Modifications Log and Danger Tag Log have been reviewed to identify and correct any items which may restrict the performance of the test.
/ 3.4 Instrument inputs to GETARS is arranged to include those identified by Attachment 9.4, as a minimum, and at a scan rate of less than or equal to 250 millisecond interval.
/ 3.5 The reactor coolant system flow measurement test, 1-ST-11, has been completed and the RCS flow instrumentation has been adjusted as required.
s 1-ST-22 Rev. 2 I Page 3 of 12 )
i INITIALS /DATE 3.6 The following systems are available for use:
/ 3.6.1 Station Computer.
/ 3.6.2 Service Air.
/ 3.6.3 Instrument Air.
/ 3.6.4 Circulating Water System.
/ 3.6.5 Main Condenser.
/ 3.6.E Chemical and Volume Control System (including auxiliary spray).
/ 3.6.7 Steam Dump (including atmospheric relief valves).
/ 3.7 The station Operations Manager and Training Center Manager have been notified of the estimated start of the test, so thatasmanyOperationspersonnelaspossiblemay} witness the test. (See Reference 2.4.)
/ 3.8 The Unit Shift Supervisor has been notified that the test is about to commence.
4.0 SPECIAL PRECAUTIONS 3.10,3 e' p ,, g g g ,) 1 , p g .
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/ 4.1 The requirements of Technical Specifications 3.4.1.1 or 3.10.4 and the associated surveillance requirements must be adhered to throughout the performance of this test.
/ 4.2 Do not exceed 5% thermal power at any time during this test.
/ 4.3 The normal AT and Tavg indications will be unreliable during natural circulation conditions. The wide range hot and cold leg indications should be used to calculate these values.
/ 4.4 Cold leg temperature should be maintained at approximately the initial (pre-RCP trip) temperature.or greater than 550 F unless otherwise directed.
/ 4.5 All personnel participating in the test should be aware that the moderator temperature coefficient is near zero and may change sign during the test. This is to reduce reactivity feedback effects related to the moderator tem-perature coefficient.
/ 4.6 Maintain steam generator and feedwater conditions as stable as possible as natural circulation develops.
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/ 4.7 Minimize thermal shock on the pressurizer spray nozzle by initiating spray slowly and maintaining a minimum con-tinuous flow once spray is actuated.
/ 4.8 Do not use auxiliary spray if letdown is isolated.
/ 4.9 If a reactor trip occurs during natural circulation, close the spray valves (RC-PCV-455A and B) and restart Reactor Coolant Pump RC-P-1C prior to closing the reactor trip breakers. p m7
/ 4.10 Refer to the manual trip criteria listed in Attachment 9.3. Insure that these criteria are available in the control room for operator reference. /
/ 4.11 Maintain CS-V177 (Loop 4 alternate charging path) in the (
" CLOSED" position throughout the test. >
/ 4.12 Charging flow should be constant and at as low a flow rate h as possible during this test. g 5.0 INITIAL CONDITIONS .]
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/ 5.1 Reactor power is approximately 3% with rod control in ,A/ O
" MANUAL". p-m V
/ 5.2 All reactor coolant pumps are operating. W
/ 5.3 Steam dump is operating in the pressure control mode and :
maintaining cold leg temperature at approximately 557"F in manual control. 'L
/ 5.4 The Station computer is operating.
/ 5.5 Pressurizer pressure control and level control are in manual and maintaining pressurizer pressure at approxima-tely 2235 psig and level at 25% (range 25 to 30).
/ 5.6 The startup feedwater pump is maintaining steam generator levels at approximately 50% (40-60%) narrow range, through the bypass valves.
/ 5.7 RCS boron concentration and control bank rod positions are configured to establish an approximately zero moderttor temperature coefficient. Control Banks should be arranged so that there is at least 150 pcm of inserted rod worth.
cw c va.y. cer
/ 5.8 The steam generator atmospheric relicf valves are avail-able for use as necessary.
/ 5.9 Secure steam generator blowdo,n during primary calori-metric test activities.
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- I A 1-ST-22 Rev. 2 Page 5.of 12-L INITIALS /DATE
/ 5.10 Start the GETARS data recording for the paramaters iden-
.tified by Attachment-9.4.
/! 5.11. Place analog points identified by Attachment'9.5 in a pro-cess-computer block trend with a one-minute interval.
5.12. Place the,following analog points in a process computer block trend with a one-minute trend interval.
/ 5.12.1 A0301, Reactor Coolant Loop 1 F1ow.
/ 5.12.2 A0304, Reactor Coolant Loop 2 Flow.
/ 5.12.3 A0307, Reactor Coolant Loop 3 Flow..
/ 5.12.4 A0309, Reactor Coolant Loop 4 Flow.
/- 5.13 Close, or verify closed, CS-V177. (alternate charging path) and open, or verify open, CS-V180 (normal charging path)..
/ 5.14 Perform, or verify the performance of, each intermediate and power range channel and P-7 interlock' analog channel:
operational test within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> prior to initiating startup and physics tests. Document this review in-chronological log. (This will satisfy Technical Specification Surveillance Requirement 4.10.4.1.)
6.0 TEST INSTRUCTIONS q
/ 6.1 Perform Reactor Coolant System heat balance per Attachment 9.1. pc,-r hoc. hc 7,
/ 6.2 Obtain Intermediate Range Detector Normalization constants determined by ST-16. Calculate Intermediate Range current limits to limit power to 5Y. per Attachment 9.8, and record on Attachment 9.3. i.-) ,J.,
/ 6.3 During the performance of this test, ST-22, the thermal 1 power shall be determined to be less than P-7 interlock setpoint at least once per hour. The logging of power h ,
level will be performed on Attachment 9.9. See Special Precaution 4.1. (This will satisfy Technical i
Specification Surveillance Requirement 4.10.4.1.) J,_.
/ 6.4 Obtain a core thermocouple (T/C) map at approximately three (3) minute intervals using the Station computer until the end of the stabilization period and continue as directed by the test director. Insure each map is appropriately labeled with the test number, step number, j date, time and initials of the person performing the data collection.
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g 1-ST-22 Rev. 2 Page 6 of 12-INITIALS /DATE
/ 6.5 Perform, at approximately ten (10) minute intervals, sub-coolirg monitor performance test as directed in Attachment 9.2. ..This subcooling monitoring will continue throughout the test unless otherwise directed by the test director, or as specified within the test. Coordinate data collec-
-tion with T/C map data recording..
'6.6 : Natural Circulation
/ 6.6.1 Simultaneously trip all reactor coolant pumps.
Annotate GETARS and MPC trends and record the time .
NOTE: .1) The. steam generator levels may. shrink slightly before swelling.
- 2) Expected RCS response is listed in Attachme6t 9.3, along with the manual trip criteria.
/ 6.6.2 Place Spray Valve Controllers RC-PK-455B and gj RC-PK-455C in " MANUAL", and open (fully) Spray Valves RC-PCV-455A and RC-PCV-455B. (0pening
'(( these valves will allow auxiliary spray flow to go to' loops 1 and 3, and closing these valves will direct auxiliary spray flow to the pressurizer.)
/ 6.6.3 Adjust charging flow and letdown. flow, as required to maintain constant RCS water mass. Maintain pressurizer level control in ' MANUAL'.
NOTE: Pressurizer level can be expected to increase slightly over 1 percent per degree Fahrenheit change in RCS average temperature. Do not allow pressurizer level to increase above 60*/..
NOTE: Steps 6.6.4 and 6.6.5 can be repeated, as required to control pressurizer pressure at the direction of the test director.
CAUTION: MINIMIZE SPRAY N0ZZLE THERMAL SHOCK BY INITIATIN SPRAY FLOW SLOWLY AND MAINTAINING SPRAY FLUID AT
) TO LESS THAN 320*F.
/ 6.6.4 If pressurizer pressure exceeds 2260 psig, open Auxiliary Spray Valve CS-V185. Manipulate CS-V185, RC-PCV-455A ac4 RC-PCV-455B, as necessary, to maintain approximately 2260 psig.
/ 6.6.5 If pressurizer pressure exceeds 2290 psig, close charging line valve, CS-V180, and manually throttle close Spray Valves RC-PCV-455A and RC-PCV-455B, as required to maintain pressurizer pressure at approximately 2260 psig.
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1-ST-22 Rev. 2 l
Page 7 of 12 L
l INITIALS /DATE I
/ 6.6.6 Maintain the plant at stable conditions while natural circulation stabilizes.
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/ 6.6.7 Natural circulation should take from 10 to 50 minutes to stabilize. Verify plant conditions i approximating the conditions below are observed. i Note characteristics in the chronolog. I
- a. Constant AT between wide range hot and cold leg temperatures.
- b. Constant AT between wide range cold leg tem-perature and core exit T/C temperature.
- c. Wide range hot leg temperature is approxima- b tely equal to core exit T/C average tempera-ture.
/ 6.6.8 Annotate GETARS and Station computer trends when stable natural circulation is achieved. Record the time and continue recording data for d minimum of thirty minutes.
/ 6.6.9 Collect data for Attachment 9.1, Page 3.
6.7 Auxiliary Spray Depressurization Rate Demonstration
/ 6.7.1 Verify, or adjust as required, so that pressurizer pressure is between 2225 and 2260 psig, and that pressurizer level is stable.
/ 6.7.2 Continue to obtain core thermocouple maps approxi-mately every five minutes and start data trending equipment, as required.
/ 6.7.3 Place the Pressurizer Backup Heater Groups A, B, C and D control switches to the "0FF" position.
/ 6.7.4 Place or verify the pressurizer control heater group control switch is in "AUT0" position.
NOTE: Maintain an accurate log (chronological log) of position of Charging Line Valve CS-V180 and Spray Controllers RC-PK-455B and RC-PK-455C.
/ 6.7.5 Open, or verify open, Auxiliary Spray Valve CS-V185. If pressure cannot be maintained below 2260 psig with CS-V180 open, mark N/A for Steps 6.7.6 - 6.7.7 and go to Step 6.7.8.
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1-ST-22. Rev. 2 i
Page 8 of 12 INITIALS /DATE CAUTION: -MINIMIZE SPRAY N0ZZLE' THERMAL SHOCK BY INITIATING SPRAY FLOW SLOWLY'AND MAINTAIN SPRAY FLUID AT TO LESS THAN 320*F.
'/ _6.7.6 Open, or verify open, CS-V180,.and observe pressure response for at least fifteen minutes.
Five minutes into the observation period, close Spray Valve RC-PCV-455A._ When RC-PCV-455A is shut, close RC-PCV-455B, as possible (see note).
Annotate GETARS and MPC trends.
NOTE: Do not allow pressurizer pressure to drop below approximately 2000 psig. % ,- e
/ 6.7.7 Open Spray Valves RC-PCV-455A and RC-PCV-455B, and close CS-V180. . Allow pressure to recover to a value greater than 2100 psig and stabilize.
Annotate GETARS and MPC trends.
/ 6.7.8 Close RC-PCV-455A and RC-PCV-455B and observe the pressurizer pressure response. Annotate the. -<
GETARS and Station computer trends.
/ 6.7.9 Position RC-PCV-455A, RC-PCV-455B, CS-V180 and the pressurizer heater controls, as required, to sta-bilize pressurizer pressure at approximately 2050 psig. Annotate GETARS and MPC trends.
'/ 6.7.10 Perform a subcooling monitor performance check as directed in Attachment 9.2.
6.8 Charging and Steam Flow Effect on Subcooling
/ 6.8.1 Start data trending if stopped and annotate the trends with date, time and section.
/ 6.8.2 Increase pressure and stabilize at approximately 2200 psig using RC-PCV-455A, RC-PCV-455B, CS-V180 and the pressurizer heaters as required. Reduce pressurizer spray flow to a minimum so that charging flow to the RCS loop is maxiinized.
/ 6.8.3 Perform a subcooling monitor performance check as directed in Attachment 9.2.
/ 6.8.4 Note current charging flow rate ( gpm) and increase charging flow by approximately 15 gpm.
Stabilize the charging flow, then perform a sub-cooling monitor check (Attachment 9.2). Allow approximately 15 minutes to elapse before continuing. (Record actual charging flow rate in the chronolog.)
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1-ST-22 Rev. 2 Page 9 of 12 l
INITIALS /DATE
/ 6.8.5 Increase charging flow an additional 15 gpm.
Stabilize the charging flow, then perform a sub-cooling monitor check. (Attachment 9.2) Allow approximately 15 minutes to elapse before continuing. (Record actual charging flow rate in the chronolog.)
/ 6.8.6 Reduce charging flow and lower pressurizer level as required. Balance charging and letdown flow rates.
/ 6.8.7 Use the pressurizer heaters to stabilize RCS pressure at approximately 2235 psig,.then perform a subcooling monitor performance check.
/ 6.8.8 Carefully increase steam dump flow until the RCS average cold leg temperature has decreased by approximately 5"F. Avoid an excessive increase in steam flow.
NOTE: The 5"F increase in saturation margin is desired, but is not required for test acceptance. Do not decrease cold leg temperature below 550 F.
/ 6.8.9 Perform a final subccoling monitor performance check. Obtain the final T/C maps.
/ 6.8.10 Place all pressurizer heater controls in "AUT0" with a 2235 psig setpoint.
6.9 Loss of Pressurizer Heaters During Natural Circulation
/ 6.9.1 Open, or verify open, the normal charging supply valve, CS-V180, and close, or verify closed, Auxiliary Spray Valve CS-V185.
/ 6.9.2 Start the GETARS and MPCS data trending groups identified in Steps 5.10 and 5.11, as required.
/ 6.9.3 Af ter approximately ten (10) minutes, secure all pressurizer heaters. Backup heaters to "0FF",
control group to "0FF". Record time ,
and annotate GETARS and MPCS data trends, as appropriate.
/ 6.9.4 Mark the pressurizer pressure recorder, RC-PR-455, to denote the start of RCS pressure reduction.
/ 6.9.5 Continue to acquire data until one of the following conditions is reached:
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4 1-ST-22 Rev.-2:
Page 10 of.12-W6 INITIALS /DATE
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M v.f a) . RCS Tavg below 541*F (any WR.Tave).
b) Pressur1zer pressure below 2050 psig;(by:
L lowest sensor),
c) Pressurizer' heaters must be used for any reaso- I i d) Reactor coolant pumps are started due to.
,. unplanned or unexpected equipment conditions. j L e) One hour (60 minutes) has elapsed..
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, / 6.9.6- Mark the pressurizer pressure recorder, RC-PR-455,. -j l to-denote the end of data acquisition. '
/- ' 6.9.7- Return the pressurizer heater control.' switches to' the configuration desired by the Unit Shift Supervisor. Record the time .
'/< 6.9.8 Stop the GETARS and MPCS data trending groups. . .
Remove MPC trend from logger and mark with test number, date, time and step. sequence. Additional data. collection may be desired, and it is at the discretion of the test director to continue data
. collection. \ L 6.10 Plant Restoration
/ 6.10.1 Shut down the reactor by fully inserting the control banks and log the mode change.-
/ 6.10.2 Fully insert the shutdown rods. ;
/ 6.1013 Open the reactor trip breakers. Upon opening the breakers, notify I&C to perform 151680.950, P-4 voltage testing. p
/ 6.10.4 Open, or verify open, the normal charging valve, CS-V180, and close, or verify closed, Auxiliary Spray' Valve CS-V-185.
/ 6.10.5 Place pressurizer spray c~oritrollers PK-455B and PK-455C in " MANUAL / CLOSED". Operate pressurizer heaters as required to maintain RCS pressurizer at approximately 2235 psig.
/ 6.10.6 When wide range AT is less than 5'F and pressuri-zer level is stable at 25 to 30 percent, restart Reactor Coolant Pump RC-P-1C in accordance with Station operating procedures.
/ _ 6.10.7 After pressurizer pressure has stabilized, return Pressurizer Spray Controllers RC-PK-4558 and RC-PK-455C to "AUT0".
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