ML18086A637

Boron Mixing & Cooldown.

ML18086A637
Person / Time
Site:	Salem
Issue date:	06/04/1981
From:	Public Service Enterprise Group
To:
Shared Package
ML18086A634	List: ML18086A633 ML18086A635 ML18086A637
References
NUDOCS 8106050290
Download: ML18086A637 (15)

Text

STARTUP PROCEDURE 90.9 UNIT NO. 2 BORON MIXING AND COOLDOWN 1.0 OBJECTIVES 1.1 To borate the reactor coolant system and verify boron mixing, while in the natural circulation mode.

1.2 To demonstrate the capability to cool down the reactor coolant system while on natural circulation.

NOTE The test will be performed within 31 days following the completion of the Power Ascension Test Program.

2.0 REFERENCES

2.1 Salem Unit 2 Technical Specifications, Special Test 3.10.4 2.2 Station Plant Manual 2.2.l OI I-3.6, Hot Standby to Cold Shutdown.

2.3 Operating License DPR-75, Natural Circulation Tests (Section I.G.l)

Salem Unit No. 2 Page 1 of 15 SU 90.9

3.0 PREREQUISITES 3.1 The source range channels are operable.

3.2 The reactor has been operated at approximately 100% for a minimum of ten (10) days prior to shutdown for the test.

3.3 The P-250 computer is operational with a dedicated analog recorder operating as a saturation meter.

3.4 P-250 routines for incore T/C maps are operational.

3.5 Chart recorders are set-up to record the plant parameters outlined in section 8.0 as designated by the Test Engineer.

3.6 The P-250 is trending the computer address points listed in section 8.0.

3.7 Station QA has been notified of the start of this test.

3.8 Natural Circulation testing per SUP 90.0 is complete.

Page 2 of 15 SUP 90.0 Salem Unit No, 2

4.0 INITIAL CONDITIONS 4.1 Four RCP's arein operation.

4.2 RCS temperature (T ) is being maintained at approximately 547°F.

avg 4.3 Pressurizer pressure control is maintaining RCS pressure at approximately 2235 psig.

4*4 Monitor: pressurlzer' ;levei at appro:dmate*ly 22% by manual controL bf the charging:pump flow.

4.5 Steam Generator levels are being maintained at approximately 33% on the narrow range indicators via the Auxiliary Feedwater System.

4.6 Steam pressure is approximately 1005 psig being maintained by the Steam Dump System in the Pressure Control mode or alternatively by the Atmospheric Steam Reliefs (MSlO) if the condenser steam dump is unavailable. (Preferred is to condenser for SG pressure equalization.)

4.7 The boron concentration of the pressurizer is within+ 20 ppm of the RCS loop.

4.8 Three consecutive 20 minute samples of the RCS have a maximum deviation in boron concentration of 10 ppm.

4.9 The RCS sampling system is operable.

4.10 The reactor is shutdown.

~~~

4.11 Time of shutdown ~~~~

NOTE This procedure must be executed as soon as possible following the plant shutdown to ensure that sufficient decay heat will be available for natural circulated flow.

Salem Unit No. 2 Page 3 of 15 SUP 90.9

5.0 ENVIRONMENTAL CONDITIONS 5.1 Atmospheric steam dump may be required during the performance of this test.

6.0 ACCEPTANCE CRITERIA 6.1 The ability to borate the RCS while in natural circulation has been demonstrated.

6.2 The ability to cooldown the reactor coolant system while in natural circulation has been demonstrated.

7.0 SPECIAL EQUIPMENT Serial # Calibration Date 7 .1 Chart aecorders No. 1 No. 2 No. 3 No. 4 Salem Unit No. 2 Page 4 of 15 SUP 90.9

8.0 DATA COLLECTION 8.1 All data acquired as a result of the performance of.this procedure shall be recorded at the appropriate step, on attached data sheets or affixed as appropriate.

8.2 Connect chart recorders to the following test points:

Recorder# Channel Test Points Range Loop 21 Tc TE 413B 400-600°F Loop 21 Th TE 413A 400-600°F Loop 22 Tc TE 423B 400-600°F Loop 22 Th TE 423A 400-600°F Loop 23 Tc TE 433B 400-600°F Loop 23 Th TE 433A 400-600°F Loop 24 Tc TE 443B 400-600°F Loop 24 Th TE 443A 400-600°F S/G 21 Pressure PT-516 400-1200 psig S/G 22 Pressure PT-526 400-1200 psig S/G 23 Pressure PT-536 400-1200 psig S/G 24 Pressure PT-546 8.3 The P-250 computer trend typewriter will be used to monitor the following computer points. The trend printout will be attached as data.

Address Parameter P0480A Pressurizer Pressure L0480A Pressurizer Level T0419A RCS Loop 21 Hot Leg Temperature T0406A RCS Loop 21 Cold Leg Temperature T0439A RCS Loop 22 Hot Leg Temperature T0426A RCS Loop 22 Cold Leg Temperature T0459A RCS Loop 23 Hot Leg Temperature T0446A RCS Loop 23 Cold Leg Temperature T0479A RCS Loop 24 Hot Leg Temperature T0466A RCS Loop 24 Cold Leg Temperature P0400A Stearn Generator 21 Pressure L0400A Stearn Generator 21 Narrow Range Level P0420A Stearn Generator 22 Pressure L0420A Stearn Generator 22 Narrow Range Level P0440A Stearn Generator 23 Pressure L0440A Stearn Generator 23 Narrow Range Level P0460A Stearn Generator 24 Pressure L0460A Stearn Generator 24 Narrow Range Level N004 !A SouICe Range Channel N31 N0046A Source Range Channel N32 Page 5 of 15 SUP 90.9 Salem Unit No. 2

Address Parameter U0090A Hottest Incore Thermocouple T0482A Pressurizer Surge Line Temperature TOOOlA through Incore Thermocouple (Selected)

T0065A T0127A retdown temperature 8.4 The following data (as applicable) shall be recorded on each strip chart and computer listing:

al Unit Number bl Date c) Procedure number, step number and run number are appropriate dl Parameter scale (s) and range (sl el Chart speed fl Name of person recording data gl Recorder ID number hl Time mark for start of test 8.5 Record operator participation in the test on Appendix A.

Page 6 of 15 SUP 90.9 Salem Unit No. 2

9.0 PRECAUTION 9.1 Avoid sudden changes in auxiiiary feedwater flow rate or in steam generator level.

9.2 During boration use auxiliary spray to provide maximum mixing in the pressurizer.

9.3 Pressure Control using auxiliary spray NOTE Due to the ineffectiveness of normal spray, without the forced circulation provided by the RCP's, it will be necessary to utilize auxiliary spray for this test. The following precautions and special operator instruction are intended to minimize the problem of thermal shock and thermal cycling of the spray nozzle.

Precautions

1) Minimize the number of auxiliary spray initiations to avoid thermal stress transients on the auxiliary spray piping and pressurizer nozzle.

2) Maintain auxiliary spray temperature at the.normal charging flow temperature; i.e. maintain letdown/

charging relative f lowrates utilizing the regenera-tive heat exchanger.

3) Avoid operations which will result in isolating the letdown flowpaths when utilizing auxiliary spray while the plant is at hot conditions.

4) Avoid operations which would result in changes in the auxiliary spray temperature.

Suggested Pressurizer Auxiliary Spray Operating Procedure

1) Establish minimum letdown flow (45 gpm) and control of the charging flowrate to ensure pressurizer water level is maintained as desired. Note: This will provide ~ 25 gpm of charging flow with normal (8 gpm) seal injection flow to each RCP. Verify that the Letdown flow is being cooled to below 380°F. (T0127A)

2) Initiate auxiliary pressurizer spray flow by opening the auxiliary spray isolation valve 2CV75. Note:

Maintain the normal charging flowpath in the open position. Close 2PS1 and 2PS3 manually.

3) The auxiliary spray will be maintained and pressurizer pressure control will be maintained by the heaters in automatic.

4) Spray flow can be increased by increasing the charging and letdown flow rates, reducing seal injection to approximately ~ gpm per RCP or isolating charging.

Isolating charging has the greatest effect since the entire charging flow is now going through the pressurizer spray line to the pressurizer.

Page 7 of 15 SUP 90.9 Salem Unit No. 2

5) When charging is isolated, verify tha~ letdown flow is maintained less than 390°F (T0127A) .

9.4 RCP OPERATION 9.4.1 Before tripping RCP's to go to natural circulation start all oil lift pumps and leave them running.

9.4.2 RCP's should not be restarted for 30 minutes after a pump trip, unless safety concerns necessitate the immediate re-establishment of forced circulation. Start 22 RCP if a Safety Injection occurs.

9.4.3 Maintain seal injection for~ 6 gpm for each RCP. Pay additional attention when adjusting chargin/auxilary spray flow.

9.5 Narrow Range temperature indications, and with them the normal Tavg and Delta T displays will become unreliable without forced circulation through the RTD bypass line. Use the wide range TH and TC to calculate T and T avg Salem Unit No. 2 Page 8 of 15 SUP 90.9

NOTE: POST THIS PAGE ON THE OPERATOR'S DESK.

9,6 OPERATIONAL ACTION POINTS 9,6,l MAINTENANCE CRITERIA - IF THE FOLLOWING LIMITS ARE EXCEEDED AND IF MARGIN EXISTS BETWEEN THESE nMAINTENANCE CRITERIA" AND THE TEST TERMINATION ACTION POINTS LISTED BELOW, OPERATOR ACTION SHALL.BE TO RESTORE THE PARAMETER TO WITHIN LIMITS:

1. PRIMARY SYSTEM SUB-COOLING CTSAT MARGIN) >20°F

2. STEAM GENERATOR WATER LEVEL >30% NARROW RANGE SPAN

3. PRESSURIZER WATER LEVEL A) WITH PUMPS RUNNING >22% SPAN B) NATURAL CIRCULATION ,:.VALUE WHEN RCP's TRIPPED

4. LOOP T (WIDE RANGE CALCULATED ~65°F

5. TAVG (WIDE RANGE CALCULATED ~578°F

5. CORE EXIT TEMPERATURE (HIGHEST) ~6l0°F 9,6,2 TEST TERMINATION MUST OCCUR IF ANY OF THE FOLLOWING CONDITIONS ARE MET:

1. PRIMARY SYSTEM SuB-COOLING CTsAT MARGIN) . ~15°F

2. STEAM GENERATOR WATER LEVEL <5% NARROW RANGE SPAN 3, PRESSURIZER WATER LEVEL <17% SPAN OR AN UNEXPLAINED DECREASE OF MORE THAN 5% NOT CONCURRENT WITH A lAVG CHANGE, 4, ANY LOOP T (WIDE RANGE CALCULATED) >65°F 5, TAVG (WIDE RANGE CALCULATED) >578°F

6. CORE EXIT TEMPERATURE (HIGHEST >6l0°F 9.6.3 SAFETY INJECTION MUST BE MANUALLY INITIATED IF ANY OF THE FOLLOWING CONDITIONS ARE MET:

1. PRIMARY SYSTEM SUB-COOLING CTsAT MARGIN) ~l0°F 2, STEAM GENERATOR ~ATER LEVEL (EQUIVALENT WIDE-RANGE <0% NARROW RANGE SPAN LEVEL OF 57%

3. CONTAINMENT PRESSURE ~4.7 PSIG 4, PRESSURIZER ~ATER LEVEL <10% SPAN OR AN UN-EXPLAINED DECREASE OF MORE THAt 10% NOT CONCURRENT WITH A TAVC CHANGE, 5, PRESSURIZER PRESSURE DECREASES BY 200 PSI OR MORE Ir AN UNPLANNED OR UNEXPLAINED MANNER.

SAFETY lNJECTiON SHOULD NOT BE TERMINATED-UNTIL THE TERMINATION CRITERIA OF EI 1-4,0 nSAFETY INJECTION AcTUATIONn AND EI 1-4.2 nRECOVERY FROM SAFETY INJECTION" ARE MET.

Page 9 of 15 SUP 90.9 Salem Unit No. 2

10.0 INSTRUCTIONS 10.l Boron Mixing NOTE After tripping the RCP's T.S. 3.10.4 applies. The surveillance requirements of T.S. 3.10.4 are not required since the reactor is not critical.

10.1.1 Mark all charts and computer printouts per the requirements of Section 8.0.

10.1.2 Start the brush recorders measuring Th and Tc and SG pressure at .5 in/min.

CAUTION: Following Reactor Coolant Pump trip. T and AT avg indication will be unreliable. Continuously monitor main-stream line pressures and carefully control feedwater addition during the transient.

NOTE: Stearn Generator pressure, level, and flow conditions should be held as closely as possible to pre-transient conditions through the duration of the transient.

Reactor Coolant System cold leg temperatures should be maintained within+ S°F of the intial values.

At the initiation of natural circulation (RCP trip) the following temperature response is expected.

a) Wide Range Thot' increase b) Wide Range Tcold' slight decrease c) Core exit thermocouple, increase d) Tavg indication, unreliable, decreasing e) Delta-T indications, unreliable f) Pressurizer level is expected to increase about 1% for each °F increase in Tav g) Subcooling at about 85°F margin 10.1.3 Place the pressurizer relief valve 2PR2 in Manual, or manually reduce plant pressure about 50 psi to allow for an expected pressure increase transient of about the magnitude 10.1.4 Simultaneously trip all four Reactor Coolant Pumps. Keep oil lift pumps running. Time ~~~~~~~~~

10.1.5 Maintain RCP seal flow at a minimum of 6 gprn to each pump.

CAUTION: Spray will be ineffective without Reactor Coolant Pumps Auxiliary Spray or relief valves may be needed during temperature changes.

Page 10 of 15 SUP 90.9 Salem Unit No. 2

10.1.6 Maintain pressurizer pressure control in automatic and manually adjust charging flow to match letdown and maintain a constant RCS water mass. Pressurizer level is expected to vary according to T ' following the relationship of 1% level change for 1°F avg change in T avg.

10.1.7 Use the steam dump controller or atmospheric reliefs to maintain Tc between 540 and 546 °F.

NOTE Throtting of MSIV bypasses may be necessary 10.1.8 Carefully control additions of feedwater to the Steam Generators to maintain levels at ppproximately 33%. Do not allow Stearn Generator level to drop below 10% on narrow range indications.

NOTE Natural Circulation Flow will be stable when:

a) ~T between Wide Range T and Tcold is constant.

(approximately 10°F) hot bl /fr between Wide Range Tcold and core exit T/C average temperature is constant.

c) Wide Range Thot ~ core exit T/C average temperature d) Steam Generator levels are steady, or varying slowly with constant feed.

10.1.9 After steady state conditions have been reached mark each recorder chart to indicate equilibrium has been reached and continue recording data. Restore relief valve 2PR2 to AUTO.

10.1.10 Begin sampling the RCS loop (21 and 23) and Pressurizer at approximately 30-min. intervals and log results.

10.1.11 Energize pressurizer heaters and initiate auxiliary spray to provide mixing in the pressurizer to maintain equalization between the boron concentration in the RCS and pressurizer. Refer to section 9.0 for methodology for initiation and use of auxiliary spray.

10.1.12 Initiate boration to borate the RCS by 100 ppm in approximately one hour.

Time ~~~~~~

I0.1.13 Terminate boration after the RCS boron concentration has increased by approximately 100 ppm.

_ Time~~~~~

10.1.14 Continue sampling until the following conditions are reached:

(a) The difference between the RCS and pressurizer boron concentration is less than 20 ppm.

Time~~~~-

(b) The maximum variation between 3 successive 20-min. RCS samples is less than +/- 10 ppm.

Time~~~~~

Salem Unit No. Page 11 of 15 Sup 90.9

NOTE Mixing time will be approximately four (4) hours.

Save samples for reanalysis if determined it is required.

10.1.15 Re~tore normal charging and secure auxiliary spray flow. Return pressurizer heaters to automatic.

10.2 Cooldown 10.2.1 Insure that there will be an adequate shutdown margin following a l00°F cooldown by completing a shutdown margin calculation IAW The Reactor Engineering Manual.

10.2.2 Insure brush recorders and computer trends are operating per 10.1.1 and 10.1.2.

10.2.3 Obtain a thermocouple map and repeat every 20°F, 4uring c0oldown.

10.2.4 Initiate a cooldown by slowly increasing the rate of steaming IAW OII-3.6, HOT STANDBY TO COLD SHUTDOWN.

Time~~~~~~~

NOTE The cooldown should be initiated as slowly as possible to prevent possible adverse steam generator water level fluctuation. When the unit operatpJ:'.*. f~els comfortable with the SG levels, the cool down rate may be increased.

10.2.5 Upon reaching approximately 450°F, terminate the cooldown.

Time~~~~~~-

10.2.6 Establish stable conditions: Pressurizer level and pressure, primary system temperature and steam generator level and pressure.

CAUTION EQUALIZE STEAM GENERATOR PRESSURES PRIOR TO STARTING A RCP TO AVOID A SAFETY INJECTION ON STEAM LINE DIFFERENTIAL PRESSURE.

10.2.7 Ensure pressurizer spray valves are closed (if open, place pressure control in MANUAL and close the valves.)

10.2.8 Start No. 23 Reactor Coolant Pump.

10.2.9 Establish stable conditions: Pressurizer level and pressure, primary system temperature and steam generator level and pressure.

10.2.10 Start the remaining Reactor Coolant Pumps one at a time.

Salem Unit No. 2 Page 12 of 15 SUP 90. '9

10.2.11 Stop brush recorders and terminate computer trends.

10.2.12 Verify that all names of participating and observing licensed operators have been recorded in Appendix A.

11. 0 PROCEDURE COMPLETION AND COMMENTS 11.1 Note here any changes to normal plant procedure in the plant manual that should be made as a result of this test.

11.2 Comments ll.2~~~----,.,~-=--~~~-..,~~r=.,.-....--:,,---..,,...-~~...,-~~~-

Senior Shift Supervisor/Shift Supervisor Test Engineer Q.A Surveillance 11.4 Changes in SPM required as a result of this test have been noted and necessary corrections initiated.

Operating Engineer Date Salem Unit No. 2 Page 13 of 15 SUP 90.9

APPENDIX A SRO's Participating in Test SRO's Observing Test Salem Unit No. 2 Page 14 of 15 SUP 90.9

APPENDIX A (cont.)

RO's Participating In Test RO's Observing Test Salem Unit No. 2 Page 15 of 15 SUP 90.9