ML20101U050

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Issue 1 to Technical Svc Procedure TSP-30, Evaluation of Shim Motor Wattage Characteristics
ML20101U050
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 01/31/1985
From:
PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20101U035 List:
References
TSP-30, NUDOCS 8502060555
Download: ML20101U050 (53)
v • d • e


Text

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PUBLIC SERVICE COMPANY OF COLORADO TSP-30 '

3

  • FORT ST. VRAIN NUCLEAR GENERATING STATION fg Attactunent 13 TITLE: TECHNICAL SERVICES PROCEDURE NO. 30, EVALUATION OF SHIM MOTOR WATTAGE CHARACTERISTICS ISSUANCE AUTHORIZED BY PORC EFFECTIVE REVIEW DATE 1.0 PURPOSE This procedure describes the methods used to obtain wattage recordings, review the recordings, identify anomalies, establish "in" rod position and document the recordings.

2.0 APPLICABILITY This procedure applies to the Technical Services Department's periodic responsibilities with regard to monitoring shim motor performance. All in-reactor rod movement will be done by the Reactor Operator with the Shift Supervisor's concurrence as indicated in S0P 12. Technical Services' responsibility will include monitoring of the watt recorder on the MCC and requesting the desired rod motion per SDP 12 through the Reactor Operator / Shift Supervisor. Adequate shutdown margins must be maintained at all times as indicated in the Cycle Safety Analysis or by GAUGE calculation.

3.0 OBJECTIVES To establish a data base of shim motor characteristics. To establish condition of absorber strings and/or drive mechanism under anomalous conditions. To determine rod "in" position in the event ~ analog and digital ("in" limit switches or position potentiometers) indication is lost, or to verify existing indication.

4.0 PROCEDURE 4.1 Initial Conditions 4.1.1 Recording wattmeter is connected to the CRDMCC with the region (s) to be tested.

4.1.2 If the wattmeter is not connected to the desired l CRDMCC obtain a TCR through the Results Department '

and request an electrician to connect as required. I l

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. Issue 1 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 2 of 17

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$9IVlCe PUBLIC SERVICE COMPANY OF COLORADO 4.1.3 Insure the wattmeter is operational. (Turn power "on", check to see pen is correctly set and inking, and adequate chart paper is installed, or perform other checks as appropriate for the instrument.)

Zero the instrument or otherwise identify "zero" level, once the wattrecorder is on. All following references to wattace are with respect to this "zero" level, if the wattrecorder is not exactly zeroed. ,

4.1.4 Verify the wattmeter calibration date and record on TSP-30A.

4.1.5 Obtain a calibrated stopwatch and record calibration date if a timed shim sequence is to be performed.

4.1.6 Attach a voltmeter (multammeter) in the voltage measurement mode across the individual phase ground terminals for phases A, B, and C. Record voltages on TSP-30A (see diagram TSP-300).

4.2 Procurement of Data 4.2.1 Request Shift Supervisor's permission to perform shim motor wattage test. Identify Region involved and reason. Testing will normally only be done while shutdown. For normal CRDOA configurations the requirements of SOP 12-02 must be met:

Not more than 2 CRDOA absorber pairs at positions other than fully inserted, including those of any CRDOA removed from the reactor (i.e., if any CRDOA is removed, its absorber pairs must be considered fully withdrawn).

For other configurations (examples, (1) low CRDOA in a high region, (2) ICRD reinstalled, etc.) not expiicitly covered by the cycle SAR, a GAUGE run verifying the shutdown margin (2 0.01) must be performed prior to rod movement.

Review Attachment B to become familiar with watt recorder interpretation.

4.2.2 Request Reactor Operator to notify Shift Supervisor and then exercise or shim the desired control rod pair in reactor. If monitoring is to be done on a CRDOA in the HSF, request the Maintenance Refueling Supervisor or designee to exercise control rods.

FORM tC)372-22-3643

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. Issue 1 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 3 of 17 j 0 Service PUBLIC SERVICE COMPANY OF COLORADO 4.2.3 For each CRDOA to be monitored for trending / monitoring purposes, it is desired to obtain recordings of one full in and one full out movement. Record control rod position at start, finish, and at appropriate places deemed necessary.

Additional recordings, such as running the control rods "out" and "in" in twenty inch increments may also be obtained. All position information may be marked on the recording chart.

4.2.4 To establish "in" rod position with watt recorder perform the following while obtaining watt recordings:

Sequence a a) Scram the rod pair (pull the fuse, scram the Reactor, etc., as appropriate).

b) Obtain a calibrated stopwatch and prepare to time. Shim "out" for 15 seconds. (This will not have a significant effect on core reactivity since the total rod travel will be about 16 inches.)

Record time of "out" shim:

a b c c) Shim "in" for the exact time recorded above.

The rod pair should again be at the fully interted position.

d) Scram the rod pair.

Sequence b .

e) Repeat steps 4.2.4 b)-4.2.4 d) above.

Sequence c f) Repeat steps 4.2.4 b)-4.2.4 d) above.

FORMIC)372 22 3643

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1 TSP-30  !

Issue 1  :

Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 4 of 17 l Service = PUBLIC SERVICE COMPANY OF COLORADO 4.3 Evaluation of Data  :

4.3.1. "In" Position Evaluation a) For an inserted rod pair, the cable drum must wrap to raise the rod pair. . As +his occurs motor load will increase. For the "out" shims above, observe a wattage trace which shows an increasing ' steady' value after the starting peak occurs, as seen below.

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Record the minimum wattage for each "out" shim:

la lb ic Record final wattage for each "out" shim:

2a 2b 2c l

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FORMIC)372-22 3643

TSP-30

. Issue 1 FORT ST. VRAIN NUCLEAR GENERATING STATION Page 5 of 17 l

i 0Public SerVlCe* PUBLIC SERVICE COMPANY OF COLORADO b) For the "in" shims, observe an increase in the steady wattage towards the end of the shim as the drum unwraps, as seen below:

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n s- e ces s Record the nominal wattage after the starting peak for each "in" shim:

3a 3b 3c Record the final wattage for each "in" shim:

4a 4b 4c c) If the above observations are made, and if for items 1 and 2, cases a through c, 2 -

1 5= 2 X 100% > 5%, and for items 3 and 4, cases a through c 4 -

3 6= 4 X 100% > 5%,

the rod maybe considered "in"; continue to step 4.6 below.

Record:

(> 5%)

5a Sb Sc

(> 5%)

6a _ 6b. 6c d) An exact repetition of the above sequences, 4.2.4 a)-f) and 4.3.1 a)-c) may be done as many times as desired. Any sequence for which the above conditions are met may be used to conclude that the rod pair is "in".

FORMIC)372 22 3643

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4.4 Detailed "In" Rod Position Test and Evaluation  !

a. Theory Both the peak wattage and decay time for an outward shim starting at the fully inserted position varies from those of a shim starting with the drum sheave wrapped. This is due to the decreased- power to establish motion, in conjunction with a quicker decay to the final steady value due to the more rapid acceleration when the rods are not immediately required to rise upon shim initiation. Decay time is the time to reach a minimum wattage value during the shim, or the time to reach a value within 2 watts of the final extrapolated steady value, or the time of the shim, whichever is shorter.
b. Data Procurement NOTE: Any RWP or incomplete shim will require repeating the test sequence.

Sequence a i) The control rod pair is scrammed; reset the scram breaker. Start the wattrecorder when ready.

ii) Shim outward for 15 seconds; wait 10 seconds.

iii) Perform ii) again, exactly.

iv) Perform ii) again, exactly.

v) Shim inward for 15 seconds; wait 10 seconds.

vi) Perform v) again, exactly.

vii) Perform v) again, exactly. l Sequence b i viii) Repeat steps 1) - vii) above.

Sequence c )

. 1 ix) Repeat steps 1) - vii) above. l l

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w TSP-30 Issue 1 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 7 of 17 Service

c. Evaluation
1) The wattage record will indicate three sequences, each a series of 3 "out" shims and 3 "in" shims, of exactly the same duration.

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d /sce) ii) Record the wattage peaks of each shim, consecutively, below:

Sequence a "out" shims shim 1 shim 2 shim 3 la 2a 3a "in" shims shim a shim 5 shim 6 '

4a 5a 6a I Sequence b

, "out" shims shim I shim 2 shim 3 lb 2b 3b i

"in" shims shim 4 shim 5 shim 6 4b Sb 6b  ;

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TSP-30

' - Issue 1 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 8 of 17 Service" PUBLIC SERVICE COMPANY OF COLORADO Sequence c "out" shims shim i shim 2 shim 3 i Ic 2c 3c "in" shims shim 4 shim 5 shim 6 4c Sc 6c iii) Record the decay time of each shim, consecutively.

Decay time: time to reach a minimum or stable value (within 2 watts of extrapolated final steady value), or time of the shim, whichever is smaller.

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"out" shims shim I shim 2 shim 3 l'a 2'a 3'a "in" shims shim 4 shim 5 shim 6 4'a 5'a 6'a l

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L TSP-30 Issue 1 FORT ST. VRAIN NUCLEAR GENERATING STATION Page 9 of 17 0PublicService

and average iii) items 2'-6' 2'+ 3'+ 4'+ 5'+ 6' =8 5

Sequence a Record 7 and 8:

7a 8a Sequence b Record 7 and 8:

7b 8b Sequence c Record 7 and 8: -

7c 8c FORM @ 372-22 3643

TSP-30 Issue 1 Public FORT ST. VRAIN NOLEAR GENERATING STATION Page 10 of 17 0 Service" PUBUC SERVICE COMPANY OF COLORADO If for each sequence, y) 7 - 1 X 100% 2 5%

9= 7 and 8 -

l' X 100% 2 50%,

10 = 8 the rod pair may be considered "in"; continue to step 4.6.

Sequence a Record 9 and 10: (>5%) (250%)

9a 10a Sequence b Record 9 and 10: (>5%) (250%)

9b 10b Sequence c Record 9 and 10: (>5%) (250%)

9c 10c If the result is negative, r.oti fy the Shift Supervisor and Technical Services Engineering Supervisor that "The cc' trol rod pair in Region (give Region) cannot be ennsidered inserted";

continue to step 4.5 if directed.

4.5 Absolute "In" Position Evaluation NOTE: This test should only be performed if both the analog / digital position pots are not correctly 1.idicating and the "in" limit switches are not picking, or there is evidence that the multijaws coupling connecting these indicating devices is failed, causing readings inconsistent with the rod motion, or if there is an absolute need for independent verification of rod pair .

position.

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FoRMICl372 22 3643

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Issue 1 FORT ST. VRAIN NUCLEAR GENERATING STATION Page 11 of 17 OPublic Service

  • PUBLIC SERVICE COMPANY OF COLORADO Because this activity places a high risk on breaking the multijaws coupling, Station Manager approval is required to proceed.

Approval to proceed:

Station Manager Date/ Time This is the most definitive wattage test for determining "in" position.

a. Theory A shim in which the motor raises the control rod pair, nominally referred to as outward shim, performed by shimming in the "out" direction, differs from an inward shim due to the differences in the peak and steady wattages, for the case where the cable drum is wound approximately turn so that the moment arm is developed.

At the fully inserted position, the moment arm is zero, as the rod pair hangs free from the drum attached by the anchor ends. At this point, the transient peak for an "out" or "in" shim is the same, although under normal conditions only an "out" shim may be accomplished, as the picking of the "in" limit switches precludes shimming in the inward direction.

Note that if the "in" limit switches fail or are opened up, shimming in the inward direction is again possible, except that now the cable is wrapping around the drum sheave in the reverse direction. Hence the shim motor is essentially performing a raising transient, which requires more wattage than an insertion transient.

Thus the shim motor wattage transient will appear as if an "out" shim is being performed, even though the shim is in I

the "in" direction.

The crux of this test is to observe the change in the motor transient performance that will occur if the rods are at the fully inserted position.

b. Data Procurement NOTE: Any RWP or incomplete shim will require repeating the test sequence.'

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. TSP-30 Issue 1 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 12 of 17 0 SerVICO PUBLIC SERVICE COMPANY OF COLORADO WARNING: The following sequence must be performed exactly to minimize risk of jamming the assembly.

Sequence a i) The control rod pair is scrammed; reset the scram breaker. Start the wattrecorder when ready.

ii) Shim "out" for 10 seconds; wait 2 10 seconds.

Shim time:

a b c 111) Shim "in" for 10 seconds; wait 2 10 seconds.

Shim time:

a b c iv) Shim "in" for 10 seconds; wait 2 10 seconds.

Shim time:

a b c v) Shim " cut" for 10 seconds; wait 2 30 seconds.

Shim time:

a b c Sequence b vi) Repeat 1) through v), exactly.

Sequence c vii) Repeat 1) through v), exactly.

c. Analysis
1) Determine the final wattage values for the shims in item b. ii); if no steady value was obtained, note.

la Ib ic

11) Determine the steady wattage for the shims in item I
b. iii). This will correspond to the minimum I wattage seen during these shims.

2a 26 2c FORM (C)372 22 3643

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Issue 1 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 13 of 17 service

  • PUBUC SERVICE COMPANY OF COLORADO iii) Calculate for 1) and 11), items a through c above 1 -

2 3= 1 X 100%

iv) Determine the final wattage for the shims in item

b. it); if no steady value was obtained, note.

4a 4b 4c v) Determine the steady wattage for the shims in item

b. v). This will correspond to the minimum wattage .

seen during these shims.

Sa Sb Sc vi) Calculate for iv) and v) items a through c.

4 -

5 6= 4 X 100%

vii) If for items a through c, 3 > +25%

and 6 > +25%

Record 3 and 6, items a through c, below:

(>+25%)

3a 3b 3c

(>+25%)

6a 6b 6c Then the rod pair may be considered "in"; continue to step 4.2.5 a 5).

If the result is negative notify the Shift Supervisor and Technical Services Engineering Supervisor that "The control rod pair in Region (give Region) cannot be considered inserted";

continue to step 4.6.

4.6 Disable Rod Motion FORMtC1372-22 3643

TSP-30 Issue 1 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 14 of 17 SerVICO PUBLIC SERVICE COMPANY OF COLORADO To insure no rod motion for shutdown margin purposes, instruct the Reactor Operator to pull the fuses on that Region and write a System Status Tag precluding rod motien for that rod pair.

4.7 Transient Evaluation 4.7.1 Normal Operation a) For shims that begin/end at more than 10 inches position, the wrapping / unwrapping behavior in a. is not observed.

b) For the "in" shims, observe an increase in wattage at the initiation followed by decay to a steady value over the next 10 seconds. Nominally the-wattage should peak at 140-150 watts and decay to 40-50 watts.

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<ta c t siep g c) For the "out" shims, observe an increase in wattage at the initiation followed by decay to a steady value over the next 10 seconds. Nominally the wattage should peak at 160-180 watts and decay to 80-100 watts.

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FORM (C)372 22 3643

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Issue 1 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 15 of 17

$9TVIC9" PUBLic SERVICE COMPANY OF COLORADO d) Over the duration of a continuous "out" shim from the fully inserted position, a gradual rise in wattage is seen of ~6 watts, due to the spiral wrapping of the drum sheave slightly changing the sheave moment arm. _

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o i z 5 Nmin) e) Over the duration of a continuous "in" shim from the fully withdrawn position, a gradual decline in wattage is seen of ~6 watts due to the unwrapping of the drum sheave.

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o a  % 3 4.7.2 Rotor Seizure a) Rotor (hence drive mechanism) seizure is indicated by nearly instantaneous changes in wattage of very large magnitude. Should these be observed, rod motion should be stopped and evaluation of circumstances performed.

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FORM (C)372-22 3643

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Issue 1 TPublic FORT ST. VRAIN NUCLEAR GENERATING STATION Page 16 of 17

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O Service" PUBUC SERVICE COMPANY OF COLORADO 4.8 Documentation Upon completion of monitoring, record the region that was tested or indicate HSF if conducted there, the CRD0A serial number, primary coolant temperature and moisture level as available.

This information can be recorded on the wattage recording. Sign and date the chart recording and attach to this procedure. This information is recorded on Attachment TSP-30A.

4.9 Review Review the recordings for unusual wattage. Normal steady readings are 90 watts during withdrawal and 44 watts during insertion; transient peaks should be 70 to 95 watts.

Normal readings are 90 20 watts out 44 20 watts in 4.10 Notification If abnormal readings are obtained notify the Technical Services Engineering Supervisor.

4.11 Historical CRDOA Data File copies of anomalous chart recordings with the Technical Services Control Rod Historical Information. Complete the Evaluation Summary and forward to the Technical Services Engineering Supervisor for review.

4.12 Records Transmit the original attachment and chart recordings to Record Storage; retain copies in Technical Services files for review.

Also transmit completed evaluations and recordings for any position evaluations.

5.0 REFERENCES

SOP 12 GA-9806, Operation and Maintenance Manual, CRDOA WATTMETER USE TO DETERMINE INSERTED ABSORBER STRING POSITION, Engineering Analysis by Jim Eggebroten FORM (C)372 22 3643 4

TSP-30 Issue 1

.Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 17 of 17 Service

  • PUBUC SERVICE COMPANY OF COLORADO 6.0 ATTACHMENTS Attach. TSP-30A, Evaluation Summary Sheet Attach. TSP-30B, Typical Transient Analysis Sheet Attach. TSP-300, Sample Transient Records FORM (C)372 22 3843

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Attach. TSP-30A l Issue 1 Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 1 of 1 0 Service" PUBUC SERVICE COMPANY OF COLORADO EVALUATION

SUMMARY

SHEET Engineer / Technician: Date:

QC Representative:

Wattmeter Identification: Calibration Date:

Stopwatch Identification: Calibration Date:

Voltmeter (Multameter)

Identification: Calibration Date:

Location (check) Reactor HSF If Reactor: Region Moisture (if available) ppm *F Inst (MM9305,MM9306,MM9307)

T Circ Inlet *F CRD0A SN (if available)

Phase-to ground voltages during shim: A B C (Not required for position determination.)

SUMMARY

OF OBSERVATIONS Completed By: Date:

Date:

Technical Services Engineering Supervisor

("In" position verification and abnormal readings, only.)

Make a copy for fechnical Services files and forward originals to Records Storage.

FORMICl372 22 3643

y Attach. TSP-30B Issue 1 FORT ST. VRAIN NUCLEAR GENERATING STATION Page 1 of 1 0Publicservice

  • PUBUC SERVICE COMPANY OF COLORADO WATTMETER INTERPRETATION .

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i FORM (Cl372 22 3643 i

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Attach. TSP-30C '

e Issue 1 Public , FORT ST. VRAIN NUCLEAR GENERATING STATION Page 9 of 9 Service

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- --- +m...+_..u . . .. _ _ , . , _ m. . _ . . _ , , _ . . . . _ _

x _ --

Attachment 14 O&M REFERENCES TO MOTOR WATTAGE Page 47: 60 watts - maximum normal out wattage beyond which reliable scram capability not assured.

Page 64: At motor supply voltage of 105V:

22 watts - normal insertion wattage 72 watts - normal withdrawal wattage Page 75: At motor supply voltage of 105V:

72 watts - normal withdrawal wattage 18 watts -

difference between normal and value beyond which scram may not occur due to high friction.

a 0

l l

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1 Attachment 15 -

FSAR REFERENCES TO WATTAGE

-The rod withdrawal reading, with the additional 1.0 to 1.3 in-lb torque applied to the motor, was 90w compared to a normal (i.e., "as built") wattage reading of 72v.

Page 3.8-5 9

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SDP 12-01 1 Issue 15  ;

k PubilC FORT ST. VRAIN NUCLEAR GENERATING STATION Page 17 of 20

/ Service'" PUBUC SERVICE COMPANY OF OOLORADO ,

l ATTACHMENT 7 TO P-85040 5.6.11 Bypass the rod out limit.

5.6.12 Obtain Reactor Operator permission and withdraw rod to full retract limit. - 1000 2.

l *#*Section 5.7 is the result of an NRC commitment.

I Reference G-84392 and responses. DO NOT DELETE l without issuance of comparable controls.*#*

l 5.7 No "In Limit" Light On Fully Inserted Rod.

5.7.1 Verify there is no slack cable indication.

l 5.7.2 Reset Scram per Section 3.2 l 5.7.3 First withdraw affected rod pair to a digital l indication of ~6". Do not first insert the rod, l since damage to position potentiometers could l occur.

l 5.7.4 Manually insert rod until rod motion stops or a i l digital indication of 0.0", whichever occurs first.

l 5.7.5 Verify "In Limit" light is lit. If not, initiate

, l SSR.

l . .

4

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l FORMICl372 22 3643

gy:  ; - .-

. h ]; & _ Q lL; w s :~ @ n i< c uiq 2 8 Q g f j a ;ll,y ".  : .u.

ATTACHMENT-8' NUM3ER. #84-17 TO ,P-85040 ISSUE 2 DATE 1/31/85 SYSTEM 11 OPERATIONS ORDER 1 ,

' ATTENTION:

lXXXXXXl lXXXXXXl IXXXXXXI lXXXXXXl 1 1 I I I I I I SS RO EO AT Note:

Initial when order is read E

I i

I

~

CRD PURGE FLOW LOST The loss of Control Rod Drive (CRD) purge flow is alarmed in the Control Room. The intended response to a low purge flow alarm is:

1. Review purified helium flow, pressure and temperature indications for abnormal indications.
2. Verify by local indication that flow alarm is valid.
3. Attempt to recover purge flow. g a w,. - - . - - - . , . - - .- -.. ...---...,v -

.- c .. ( .

w' -

w . -g:.g_.o.. a; c_ a. .

- S. ;,;p. .

NijMBER #84-17' ISSUE 2 DATE 1 ru mm SYSTEM 11

4. If available, switch to the standby helium purification train.

If the above steps do not restore purge flow, reactor power will be reduced to less than 2% by following established operating .

procedur'es. ,

High Motsture in Primary Coolant

1. Average core outlet temperature 21200*F and chemical impurities 2 10 ppm as determined by Health Physics. Reduce core outlet temperature to < 1200*F. Further reduction of core outlet temperature may be necessary to remain in the limited acceptable range on Figure 4.2.11-1 in the Technical Specifications.
2. Average core outlet temperature s 725'F.
a. If primary coolant dew point temperature is equal to or greater than 60*F, scram reactor per EP B-1 and notify

. Superintendent of Operations.

J f/26 ud S~uperintenceht, Operations (or) Station' Manager

'T 06 #

, p6 J

4 1

. , . . _ - . . . - -. . - . .- - - - -

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