ML20074A503

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Rev 2 to Procedure SOP-SG-2, Secondary Plant Chemistry Control
ML20074A503
Person / Time
Site: Indian Point Entergy icon.png
Issue date: 05/02/1983
From: Gillen J
POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:
Shared Package
ML093431236 List:
References
NUDOCS 8305130123
Download: ML20074A503 (16)
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  • POWER AUTHORITY OF THE STATE OF NEW YORK INDIAN POINT No. 3 NUCLEAR POWER PLANT S

SOP-SG-2 REV. 2 SECONDARY PLANT CHEMISTRY CONTROL l .

Written by:

Reviewed by: k A V7aA OR PORC Review C Date 5!2d3 Approved b . Date 5

/,

Effective Date

  • This procedure has been extensively revised.

8305130123 830503 PDR ADOCK 05000286 P PDR

e = I r .

This procedure is sub-divided into several inter-related procedures, as indexed below, to allow more rapid access to the information desired. ,

Number Title SOP-SG-2A Steam Generator Draining and Dry Layup SOP-SG-2B Steam Generator Filling and Wet Layup S OP-SG-2 C Chemistry Specifications SOP-SG-2 Page l'of'14 i

SOP-SG-2A Steam Generator Draining And Dry Layup s

1.0 Intent To provide a procedure for steam generator draining and dry layup.

2.0 Precautions and Limitations 2.1 To preclude various corrosion concerns S/G dry lay-up periods shall be minimized and unblanket lay-ups shall not exceed 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> unless approved by the Superintendent of Power.

2.2 Whenever possible, Steam Generators shall be nitrogen blanketed when in dry lay-up.

2.3 If secondary side maintenance or inspection of a steam generator is intended, it should be drained while still warm (greater than 150*F) in order to remove all moisture, which in the presence of oxygen, is highly corrosive.

2.4 The following are limits for chemicals discharged to the river: ,

2.4.1 CONCENTRATION CHEMICAL AMOUNT IN CANAL Boric Acid 210 lb/ day avg. 1 ppm 2.4.B At least one circulating water pump must be in service while draining a steam generator to the river to provide dilution flow.

NOTE: Credit may be taken for Con Ed Circulating Water Pumps with the i permission of the Unit 2 Control Room Operator.

l 2.5 Replace manway and handhold covers or provide temporary covers where feasible, whenever work is not being done in a drained steam generator to prevent of entry of l coist air.

3.0 Initial Conditions 3.1 The Residual Heat Removal System has been established l for cooling the Reactor Coelant System, prior to draining l all s team. generators .

SOP-SG-2 l

Pace 2 of 14

, 40 Procedura 4.1 Draining a Steam Generator for Maintenance / Inspection CAUTION This procedure is to be used only when access to the steam generator is required as so to make impractical placing the generator in dry layup per 4.2. The period of exposure to air shall be minimized and shall not exceed 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> unless approved by the Superintendent of Power.

4.1.1 With the Residual Heat Removal System in service, the Steam Generator should now be drained via the steam generator blowdown system. The maximum rate of blowdown is dependent on the chemical concentration.

NOTE: Draining the steam generator should commence before the system temperature has been reduced below 120*F in order to insure the maximum renoval of moisture from steam generator shell area.

4.1.2 As soon as the steam generator is completely drained, the secondary manway and the handhole covers on the steam generator should be removed.

4.1.3 Blowers should be used to circulate the warm air through the handholes and out the manway.

4.1.4 If it has been necessary to drain a cool steam generator, trays of desiccant should be placed in the steam generator to remove as much moisture as possible from the generator.

4.1.5 As soon as the maintenance or inspection has been completed, the steam generator should be filled and placed in the wet layup condition per SOP-SG-2B.

4.2 Draining a Steam Generator and Placing it in Dry Lay-Up 4.2.1 The nitrogen blanketing system should be placed in service when the steam generator pressure decreases to 25 psig during RCS cooldown as follows:

a. Sample nitrogen supply truck to ensure it is oxygen free (less than 0.2% O2 ). In lieu f sampling truck, gas certification is acceptable.
b. Close root valve SGN34, and makeup truck connection.

SOP-SG-2

"'N 1 f = l a-

'1

. . l

c. Place the valves on the main steam traps for l the steam generator (s) to be drained (MST-1, MST-2, MST-3 and/or MST-4) in the following positions:

Close MS-67 (Trap Inlet) .

Close MS-105A (Trap Outlet).

Close MS-105B (Condensate Return) .

Open MS-68 (Trap Bypars) .

d. Close the outlet valves from the nitrogen pressure regulators SGN-31 and SGN-33.
e. Open the nitrogen inlet valves for the steam generators to be drained SGN-26, 27, 28 and 29, for Steam Generator (s) 32, 31, 33 and 34 respectively.
f. Set nitrogen regulators PCV-1319 and PCV-1320 at 5 psig.
g. When local pressure gauge PI-1361 indicates 25 psig or below open the full valve SGN-34 and valves SGN-31 and SGN-30 on the outlet of the nitrogen pressure regulators, PCV-1319 and PCV-1320.
h. With the RHR System in service the steam generator should now be drained via the steam generator blow down system. The maximum rate of blowdown is dependent on the chemical concentration.

NOTE: Draining of the steam generator should commence before the system temperature has been reduced below 120*F in order to insure the max-imum removal of' moisture from steam generator shell area.

4.2.2 Once the steam generators have been drained, the nitrogen pressure may be reduced to 2 psig.

4.2.3 Where feasible, the generators shall be main-tained pressurized with nitrogen.

SOP-SG-2 Page 4 of 14 ,

SOP-SG-2B Steam Generator Filling and Wet Lavup 1.0 Intent To provide a procedure for filling and placing the steam generators in wet layup.

2.0 Precautions and Limitations 2.1 Maintain steam generator water chemistry within the values specified in SOP-SG-2C.

2.2 Whenever the steam generators are to be completely filled, the hangers in the main steam headers should be pinned. When returning from wet layup the pins should be removed.

2.3 The following are limits for chemicals discharged to the river:

2.3.1 CONCENTRATION CHEMICAL AMOUNT . IN CANAL Boric Acid 210 lb/ day avg. 1 ppm 2.3.2 At least one circulating water pump must be in service while draining a steam generator to the river to provide dilution flow of at least 100,000 gpm.

NOTE: 1) Credit may be taken for Con Ed Circulating Water Pumps with the permission of the Unit 2 Control Room Operator.

2) Credit may be taken for some of .

Con Edisons effluent limits with the permission from the Unit 2 Shift Supervisor.

3.0 Initial Conditions 3.1 The Residual Heat Removal System is in operation for cooling of Reactor Coolant System.

3.2 The motor driven auxiliary feedwater pumps are operable.

SOP-SG-2 a

4.0 Procedyre 4.1 Filling Steam Generator for Layup 4.1.1 Insert pins in the hangers for the main steam header for the generators to be filled.

4.1.2 Have Shif t Chemist adj ust steam generator chemistry as .equired by adding chemicals steam generators as per chemistry deparc procedures.

4.1.3 open the drain valves (MS -3 3A , MS -3 3 B , MS -3 3 C and/or MS-33D) upstream of each of the main steam line isolation valves and the vents on the main steam isolation valves for the steam generators to be filled.

4.1.4 Start the auxillary feedwater pump (s), for the steam generator (s) to which chemicals have just been added. When the water level increases to approximately 100% stop the

.punp(s).

". .:.5 To mix the chemicals throughout the steam generator (s) using the nitrogen circulation system: -

a. Open the isolation valves on each side of the N 3 ball valve for the appropriate steam geherator(s).

Steam Generator 31 - SGN-2 and SGN-14 Steam Generator 32 - SGN-1 and SGN-13 Steam Generator 33 - SGN-3 and SGN-15 Steam Generator 34 - SGN-4 and SGN-16

b. Close the sample lin'e isolation valves (989) for the appropriate steam generator (s).
c. Close the manual blowdown angle valves in the blow down storage tank room for the appropriate steam generator.
d. Place nitrogen truck in service and open SGN-41.
e. Adj ust nitrogen pressure control valve (PCV-1321) to maintain 50 psi as indicated on local pressure indicator.

l SOP -SG -2 Page 6 of 14

f. Open the ball valve (SGN-6 for Steam Generator No. 31, SGN-5 for Steam Generator No. 32, SGN-7 for Steam Generator No. 33 or SGN-8 for Steam Generator No. 34) and bubble the contents of the nitrogen truck through the steam generator for approximately 20 minutes.

, 4.1.6 Have Shif t Chemist sample the steam generator to assure that chemistry will be within specifications when the steam generator is completely filled.

4.1.7 Start the motor driven auxiliary feed water pump and fill the steam generator until water issues from drain then secure the pump if the motor driven aux. boiler feed pump was.

4.2 Adding Chemicals While in Wet Layup 4.2.1 Partially drain the steam generator (s) via the steam generator blowdown system as required, then close the blowdown valve.

CAUTION Observe precautions on chemical release to river.

4.2.2 Have Shif t Chemist adj ust Steam Ge'nerator chemistry as required by adding chemicals to Steam Generators as per chemistry department procedures.

4.2.3 Start the Auxiliary feedwater pump (s), for the steam generator (s) to which chemicals have j ust been added. When the water level increases to approximately 100% stop the pump (s).

4.2.4 To mix the chemicals throughout the steam gener-ator(s) using the nitrogen cir,culation system.

a. Open the isolation valves on each side of the N 9 ball valve for the appropriate steam generator (s).

Steam Generator 31 - SGN-2 and SGN-14 Steam Generator 32 - SGN-1 and SGN-13 Steam Generator 33 - SGN-3 and SGN-15 Steam Generator 34 - SGN-4 and SGN-16

b. Close the sample line isolation valves (989) for the appropriate steam generator (s),
c. Close the manual blowdown angle valves in the blowdown storage tank room for the appropriate steam generator,
d. Place nitrogen truck in service and open SGN-41.

SOP-SG-2

n. ust u
e. Adj ust nitrogen pressure control valve (PCV-1321) to maintain 50 psi as indicated on local pressure indicator PI-1407.
f. Open the ball valve (SGN-6 for Steam Generator No. 31, SGN-5 for Steam Generator No. 32, SGN-7 for Steam Generator No. 33 or SGN-8 for Steam Generator No. 34) and bubble the contents of the nitrogen truck through the steam generator.

4.2.5 Have Shif t Chemist sample the steam generator to assure that chemistry will be within specifications when the steam generator is refilled.

4.2.6 Start the motor driven auxiliary feed water pump and fill the steam generator until water issues from drain then secure the pump.

I SOP-SG-2 Pnec 8 Of 14

SOP-SG-2C Chemistrv Specifications 1.0 Intent To detail the secondary chemistry specifications and action limits for cold shutdown, hot shutdown and power operation.

2.0 Initial Conditions 2.1 None 3.0 Precautions and Limitations 3.1 As the concentrations of contaminants in the steam generators increases, immediate corrective action, in the form of in-creased blowdown, shall be initiated.

3.2 If steam generator blowdown alone is not sufficient to bring the steam generator chemistry within chemical specifications, additional corrective action, up to and including bringing the plant to cold shutdown, shall be immediately initiated by the Shift Supervisor in accordance with sections 4.4.1 and 4.4.2.

The rate of load reduction of cooldown should be based upon the level of contaminants and its rate of change.

3.3 Excessive hydrazine addition must be avoided as the residual hydrazine decomposes to ammonia which in turn increases copper corrosion in the feedwater heater and condenser tubes.

3.4 lf one or more sextant gross conductivity monitors read greater than 20 micromhos in conjunction with the condensate pump discharge sodium greater than 1000 ppb and the high pressure feedwater cation conductivity greater than 5 micrombos, the CST should be immediately isolated from the hotwells and the unit should be tripped immediately'and brought to a cold shutdown condition in accordance with approprivte operations procedures.

3.5 Secondary water chemistry data review as referred to in Attachment A is maintained by the following:

3.5.1 The Nuclear Plant Operator will record chemistry data during his shift.

3.5.2 The Senior Reactor Operator will initial the Control Room Chemistry Data Log Book which is maintained by the Watch Chemist.

Page 9 of 14 SOP-SG-2

. _ . . - - - - . - . ~ . - - - . .- . .-

s

  • 3.5.3 The Shift Supervisor shall be informed of any abnormal chemistry data and the Shift Supervisor should notify the Operations Superintendent of abnormal chemistry data.

3.5.4 The Operations Superintendent shall notify the Superintendent of Power of any significant abnormal chemistry data.

l 4

4 1

Page 10 of 14 SPO-SG-2

4.0 PROCEDunE .

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  • 4.1 Status Modes 4.1.1 Steam Generator status modes are as follows: Cold Shutdown, Hot Shutdown Power Operation.

A) Partial Drain, Lay-up Cold Shutdown is when the Steam Generator /RCS temperature is,2 200 F.

i The steam generator should be placed in full wet layup with chemically treated water when ever practical, and a nitrogen overpressure applied to minimize air ingress. Mixing of the bulk water shall be accomplished by nitrogen sparging. The cold shutdown period shall be utilized to reduce the steam generator impurity inventory.

B) Partial Drain is a cold shutdown condition where the S/G level is less than normal operating water level.

C) Dry Lay-up The Steam Generator is completely drained and a nitrogen blanket / overpressure should be maintained whenever practical.

B and C are the least desirable condition for steam generator protection. Elf partial. drain is necessary for maintenance the period of a partial drain / dry lay-up condition should be minimized.

D) Hot Shutdown is when the Steam Generator /RCS temperature is > 200 .

E) Power Operation is when steam is admitted to the main turbine electrical generator and reactor power is > 2%

rated power.

4.2 Maintain the following Chemical Specificatio'ns:

4.2.1 Cold Shutdown Frequency Value Prior to Parameter (Max. Freq.) , Normal Value Initiate action Heat Up pH 3/ week * > 9.8 ( 9.8 8.5 - 9.2 Hydrazine (ppm) 3/ week * > 75 ( 75 Chloride ppb 3/ week * - -

Sodium (ppb) 3/ week * ( 1000 y 1000 ( 100

(-)

Diss. Oxygen (ppb) 3/ week * -

Cation Cond. 3/ week

  • 4 20.0 7 20.0 ( 10.0 umho/cm (-)
  • Every other day until stable then weekly. *E*

~

4.2.2 Cold Shutdown, AuxiliEry Fced Watar e

Parameter Frequency Normal Value Initiate Action Dissolved Oxygen Weekly ** **

Dissolved oxygen concentration in the Condensate Storage Tank shall be minimized by the addition of hydrazine and/or recirculating the CST on the makeup water degasifier.

4.3 Hot Shutdown Parame ter Frequency Normal Initiate Value Prior to (max. Freq.) Value Action Power Escalation pH continuous 4 8.5 -

(3/ daily) 8.5-9.{)

(> 7.0 (< 7.0 ) -

y 9.2 -

Cation Cond. continuous 4 10.0 > 10. 0 < 10. 0 umho/cm (-)

Diss. Oxy. (ppb) 3/ daily <5 > 10 ,

Sodium (ppb) continuous (100 - > 10 0 < 100

(-)

Chloride (ppb) 3/ daily <.150 >150 4 150 1- If Borid Acid added to steam generator.

4.3.1 Hot Shutdown Auxiliary Feeci Water j Parameter Frequency Normal Value Initiate Action Dissolved Oxygen (ppb) daily ** **

4.4 Power Operation SOP-SG-2 cm. 1/.

, Powar Operation e.. .-

Frequency Normal Value Action Level Parameter (mauc. Freq.) 1 2 3 pH continuous / 8.5 (3/ daily) 8. 5 - g). 2 (pr7.0 k 7.0 )

79.2 Cation Cond, umho/cm continuous t 10.0 7 10 -

(-)

Sodium (ppb) continuous ec 50 7100

(-)

Chloride (ppb) 3/ daily t_100 jy150 7 500 gr750 Silica (ppb) Weekly 4 500 y 500 Feedwater Power Operation Parameter Frequency Normal Value Action Level 1 pH Continuous 8.8-9.2  ;>9.2, e:8.8 Sodium (ppm) Continuous (3  ;>3 Dissolved Oxygen (ppb) Continuous %3 775 Hydrazine Continuous 3X0 ef3X0 2 2

, Ammonia Daily

  • Total Iron (ppb) Weekly Integrated 420 5r 20 Total Copper (ppb) Weekly Integrated 4 10 7715 Cation Cond. Continuous ei 0.8 2 1.0
  • Consistent with pH.

SOP-SG-2

.-- Page 13 of 14

I e

  • 4.4.2 Condensate Power Operation Frequency Parameter _ (max. Freq.) Normal Value Level 1 Diss. oxy. (ppb) Continuous < 10 > 15 (3/ Daily)

Action Level 1 a) Identify and correct the cause for the out of normal parameter.

b) Return parameter to within normal value range within seven days after initial detection, ac) If parameter is not within normal range after seven days of initial detection go to action level 2 if applicable.

Action Level 2 a) Reduce power to 60% within eight hours of initia, tion of action level 2.

b) Return parameter to within normal value within 100 hrs after initiation of level 2 or go to level 3.

Action Level 3

3) Proceed to hot shutdown within six hours and clean up to within normal values by feed and bleed and draining and refilling.

4 l

SOP-SG-2 Pace 14 of 14

CHEMISTRY ~ DATA REVIEW LABORATORY PROCESS RESULTS ANALYZERS ,

2 g7 .

7 1

WATCH CHEMIST OPERATOR, ,

l f SENIOR REACTOR k- OPERATOR 3 r 3r CHEM!CTRY  % SHIFT SUPERVISOR SUF5P /ISORS u l r ,

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GENERAL CHEMISTRY SUPERYlSOR ,

i f 1P a a "tartf Ptnal* Et

, g OPERATIONS m SUPERINTENDENT 1 P l f  ;, .

SUPTOF POWER .

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., RESIDENT MANAGER t  :

HEADOUATER8 9

1 SOP-SG-2 ATTACHE >ENT A

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