ML20245C458

CRD Partial Scram Test Results & Max Daily Temp Rept, 890511-0531

ML20245C458
Person / Time
Site:	Fort Saint Vrain
Issue date:	05/11/1989
From:	Gappa R, Steve Jones PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20245A280	List: ML20245A277 ML20245C447 ML20245C458
References
NUDOCS 8906260193
Download: ML20245C458 (6)

Text

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l CONTROL. ROD-DRIVE PARTIAL SCRAM .1 TEST RESULTS AND MAXIMUM DAILY l

' TEMPERATURE REPORT:

i REPORT PERIOD:

'May 11, 1989 - May 31, 1989 l 1

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Prepared by: M M /,,, M k l

l. Rob Ga#Ta 7 7 System Engineer i

Systems Engineering '

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Approved by: /4 i

Steve JoneV' Preventive Maintenance Supervisor Systems Engineering Public Service Company of Colorado Fort St. Vrain Unit No. 1 8906260193 890615 4 l' PDR ADOCK 05000267 R PDR ,

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, Page 1 I. ABSTRACT This report summarizes the partial scram test results'and the

-maximum daily temperature of those control rods with motor temperatures above 215 degrees Fahrenheit. It is prepared to satisfy the Fort St. Vrain Interim Technical Specifict. tion Surveillance Requirement 4.1.1.A.I.a. ..The time period covered

.by this report is May 11, 1989, through May 31, 1989.

II. BACKGROUND Because proper operation of the Control. Rod Drive Mechanism-(CRDM). is critical for safe operation of the reactor; a series of qualification tests were conducted over a one year time span to demonstrate its capabili ty. The motor: temperature.

during 'these tests varied between 200 degrees Fahrenheit and 230 degrees Fahrenheit, and averag?d 215 degrees Fahrenheit.

A total of 130,000. jog cycles plus 1600 scrams was logged during the final design testing, which is many times- that expected 'over the normal life of a CRDM. The operating.

temperature of the CRDM is limited by the motor's Class H insulation which is de-rated to 272 degrees Fahrenheit to account for motor temperature rise, frictional torque increase, and winding life expectancy.

In order to monitor CRDM temperatures, Resistance Temperature Devices (RTD's) are mounted on the closure plate, orifice valve motor plate, and CRDM motor as shown on Figure 1. A11~

CRDM's installed in the Reactor are equipped with RTD's'.

Three recorders located in the control room record each of these temperatures for all 37 CRDM's. CRDM motor temperatures are alarmed at 212 degrees Fahrenheit and 247 degrees Fahrenheit.

CRDM motor temperatures are monitored at least once per 24' hours to verify that they are less than 250 degrees Fahrenheit, which is'a limiting condition for operation. If one or more CRDM motor temperature (s) is found to be greater than 215 degrees Fahrenheit during the daily surveillance, the motor temperature' of all CRDMs , exceeding 215 degrees Fahrenheit is recorded and a partial scram test is performed-on the CRDM wich the highest motor temperature once p1r 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. These surveillance ensure that' CRDM ' motor temper'itures exceeding 215 degrees Fahrenheit do not degrade the CRDM's reliability to perform its design function when required.

III.

SUMMARY

OF RESULTS l'

The previous months report identified Region 7 as.having a motor temperature in excess of 215 degrees Fahrenheit. The CRDM in Region 7 was replaced May 2, 1989, with a spare CRDM and has not exceeded 215 degrees Fahrenheit.

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, ., Page 2 During. the month . .of May,' Region L12 and Region 30 CRDM motor '!

temperatures . exceeded 215 . degrees Fahrenheit. .. The i temperatures were in excess of 215 degrees Fahrenheit for the.

period of May 11, 1989, through Mayu.31, 1989. On May '18,. l; 1989, . Region 30 CRDM exceeded .250 , degrees Fahrenheit. J Repositioning the: orifice valve brought the temperature below ,1 250 degrees Fahrenheit within 2' hours.

1 The partial . scram test results and' maximum daily temperature  !

of those CRDMs with' motor -temperatures above 215 degrees-- l Fahrenheit are presented on' Table 1. 'The pertinent' parameters i are: reactor region l involved,' control rod position, maximum. .

l daily ' motor'. temperature, . extrapolated. scram times (actual ,1 value,and projected'value) and starting - acceleration.- .The '

control . rod position is presented because of its. relationship l to available starting torque which .affects -the starting-  ;

acceleration and extrapolated . scram time. The extrapolated.  ;

scram time is affected by control rod position because it is j calculated. using distance travelled versus time. Since the l

' j acceleration is slower at' lower control . rod positions, a j longer period of time is' required to reach steady state speed. j This longer acceleration period results in a decrease in- i distance travelled over a given period of time,'thereby.

indicating a longer extrapolated scram time. The extrapolated scram time calculated by the Back EMF program applies a correction fcctor to provide a projected full . length scram time. .i

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The starting acceleration values presented are calculated by-the Back EMF program. These values reflect the CRDM's freedom of. rotation to accelerate to steady state speed and therefore 'j are considered to be valuable performance indicators. Two values'are presented: The actual acceleration measured during a scram from the indicated control-' rod position and ..the projected acceleration if the control rods were at the full.

out position (greater than 188 inches). If .the control . rod

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position is greater than 188 inches, no data is presented for _ ,

a projected starting acceleration . since the actual and projected are the same. 'As indicated with scram times, the .i projected starting acceleration is more readily trended since  ;

the value should be indepe'ndent of' control rod position.

i IV. CONCLUSIONS The performance of CRDMs with motor temperatures in excess of 215 degrees Fahrenheit did not show any significant trends. or '

degradation d>: ring this report period. Therefore, it.is 1 concluded that CRDM motor temperatures exceeding 215 ' degrees  !

Fahrenheit did not degrade the~CRDM's capability to perform  !

its design function when required.

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